/*
- * $Id: sysdep.c 5882 2007-12-13 19:46:05Z davew $
+ * Thread handling stuff for Citadel server
*
- * Citadel "system dependent" stuff.
- * See copyright.txt for copyright information.
+ * Copyright (c) 1987-2010 by the citadel.org team
*
- * Here's where we have the Citadel thread implimentation
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
*
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/types.h>
#include <errno.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
+#include "sysdep.h"
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
# endif
#endif
+#ifdef HAVE_SYSCALL_H
+# include <syscall.h>
+#else
+# if HAVE_SYS_SYSCALL_H
+# include <sys/syscall.h>
+# endif
+#endif
+
+#include <libcitadel.h>
+
#include "threads.h"
#include "ctdl_module.h"
#include "modules_init.h"
#include "config.h"
#include "citserver.h"
#include "sysdep_decls.h"
+#include "context.h"
+#include "event_client.h"
/*
* define this to use the new worker_thread method of handling connections
* remove the need for the calls to eCrashRegisterThread and friends
*/
-static int num_threads = 0; /* Current number of threads */
-static int num_workers = 0; /* Current number of worker threads */
+static int num_threads = 0; /* Current number of threads */
+static int num_workers = 0; /* Current number of worker threads */
+long statcount = 0; /* are we doing a stats check? */
+static long stats_done = 0;
CtdlThreadNode *CtdlThreadList = NULL;
CtdlThreadNode *CtdlThreadSchedList = NULL;
-static citthread_t GC_thread;
+static CtdlThreadNode *GC_thread = NULL;
static char *CtdlThreadStates[CTDL_THREAD_LAST_STATE];
double CtdlThreadLoadAvg = 0;
double CtdlThreadWorkerAvg = 0;
citthread_mutex_t Critters[MAX_SEMAPHORES]; /* Things needing locking */
-int idle_workers = 0;
-citthread_cond_t worker_block;
-citthread_mutex_t worker_block_mutex;
void InitialiseSemaphores(void)
int i;
/* Set up a bunch of semaphores to be used for critical sections */
- for (i = 0; i < MAX_SEMAPHORES; ++i) {
+ for (i=0; i<MAX_SEMAPHORES; ++i) {
citthread_mutex_init(&Critters[i], NULL);
}
}
* ensure nobody ever tries to do a critical section within a
* transaction; this could lead to deadlock.
*/
- if ((which_one != S_FLOORCACHE)
+ if ( (which_one != S_FLOORCACHE)
#ifdef DEBUG_MEMORY_LEAKS
- && (which_one != S_DEBUGMEMLEAKS)
+ && (which_one != S_DEBUGMEMLEAKS)
#endif
- && (which_one != S_RPLIST)
- ) {
+ && (which_one != S_RPLIST)
+ ) {
cdb_check_handles();
}
return (citthread_mutex_trylock(&Critters[which_one]));
* ensure nobody ever tries to do a critical section within a
* transaction; this could lead to deadlock.
*/
- if ((which_one != S_FLOORCACHE)
+ if ( (which_one != S_FLOORCACHE)
#ifdef DEBUG_MEMORY_LEAKS
- && (which_one != S_DEBUGMEMLEAKS)
+ && (which_one != S_DEBUGMEMLEAKS)
#endif
- && (which_one != S_RPLIST)
- ) {
+ && (which_one != S_RPLIST)
+ ) {
cdb_check_handles();
}
citthread_mutex_lock(&Critters[which_one]);
void ctdl_thread_internal_init_tsd(void)
{
int ret;
-
- if ((ret =
- citthread_key_create(&ThreadKey,
- ctdl_thread_internal_dest_tsd))) {
- lprintf(CTDL_EMERG, "citthread_key_create: %s\n",
- strerror(ret));
+
+ if ((ret = citthread_key_create(&ThreadKey, ctdl_thread_internal_dest_tsd))) {
+ CtdlLogPrintf(CTDL_EMERG, "citthread_key_create: %s\n", strerror(ret));
exit(CTDLEXIT_DB);
}
- citthread_mutex_init (&worker_block_mutex, NULL);
- citthread_cond_init(&worker_block, NULL);
}
/*
memset(tsd->cursors, 0, sizeof tsd->cursors);
tsd->self = NULL;
-
+
citthread_setspecific(ThreadKey, tsd);
}
{
int i;
CtdlThreadNode *this_thread, *that_thread;
-
- for (i = 0; i < CTDL_THREAD_LAST_STATE; i++) {
- free(CtdlThreadStates[i]);
+
+ for (i=0; i<CTDL_THREAD_LAST_STATE; i++)
+ {
+ free (CtdlThreadStates[i]);
}
-
+
/* Clean up the scheduled thread list */
this_thread = CtdlThreadSchedList;
- while (this_thread) {
+ while (this_thread)
+ {
that_thread = this_thread;
this_thread = this_thread->next;
citthread_mutex_destroy(&that_thread->ThreadMutex);
{
CtdlThreadNode *this_thread;
int ret = 0;
-
- GC_thread = citthread_self();
- CtdlThreadStates[CTDL_THREAD_INVALID] = strdup("Invalid Thread");
+
+ CtdlThreadStates[CTDL_THREAD_INVALID] = strdup ("Invalid Thread");
CtdlThreadStates[CTDL_THREAD_VALID] = strdup("Valid Thread");
- CtdlThreadStates[CTDL_THREAD_CREATE] =
- strdup("Thread being Created");
- CtdlThreadStates[CTDL_THREAD_CANCELLED] =
- strdup("Thread Cancelled");
+ CtdlThreadStates[CTDL_THREAD_CREATE] = strdup("Thread being Created");
+ CtdlThreadStates[CTDL_THREAD_CANCELLED] = strdup("Thread Cancelled");
CtdlThreadStates[CTDL_THREAD_EXITED] = strdup("Thread Exited");
CtdlThreadStates[CTDL_THREAD_STOPPING] = strdup("Thread Stopping");
- CtdlThreadStates[CTDL_THREAD_STOP_REQ] =
- strdup("Thread Stop Requested");
+ CtdlThreadStates[CTDL_THREAD_STOP_REQ] = strdup("Thread Stop Requested");
CtdlThreadStates[CTDL_THREAD_SLEEPING] = strdup("Thread Sleeping");
CtdlThreadStates[CTDL_THREAD_RUNNING] = strdup("Thread Running");
CtdlThreadStates[CTDL_THREAD_BLOCKED] = strdup("Thread Blocked");
-
+
/* Get ourself a thread entry */
this_thread = malloc(sizeof(CtdlThreadNode));
if (this_thread == NULL) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, can't allocate CtdlThreadNode, exiting\n");
+ CtdlLogPrintf(CTDL_EMERG, "Thread system, can't allocate CtdlThreadNode, exiting\n");
return;
}
// Ensuring this is zero'd means we make sure the thread doesn't start doing its thing until we are ready.
- memset(this_thread, 0, sizeof(CtdlThreadNode));
-
- citthread_mutex_init(&(this_thread->ThreadMutex), NULL);
- citthread_cond_init(&(this_thread->ThreadCond), NULL);
- citthread_mutex_init(&(this_thread->SleepMutex), NULL);
- citthread_cond_init(&(this_thread->SleepCond), NULL);
-
+ memset (this_thread, 0, sizeof(CtdlThreadNode));
+
+ citthread_mutex_init (&(this_thread->ThreadMutex), NULL);
+ citthread_cond_init (&(this_thread->ThreadCond), NULL);
+ citthread_mutex_init (&(this_thread->SleepMutex), NULL);
+ citthread_cond_init (&(this_thread->SleepCond), NULL);
+
/* We are garbage collector so create us as running */
this_thread->state = CTDL_THREAD_RUNNING;
-
+
if ((ret = citthread_attr_init(&this_thread->attr))) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, citthread_attr_init: %s\n",
- strerror(ret));
+ CtdlLogPrintf(CTDL_EMERG, "Thread system, citthread_attr_init: %s\n", strerror(ret));
free(this_thread);
return;
}
this_thread->name = "Garbage Collection Thread";
-
- this_thread->tid = GC_thread;
+
+ this_thread->tid = citthread_self();
+ GC_thread = this_thread;
CT = this_thread;
-
- num_threads++; // Increase the count of threads in the system.
+
+ num_threads++; // Increase the count of threads in the system.
this_thread->next = CtdlThreadList;
CtdlThreadList = this_thread;
if (this_thread->next)
this_thread->next->prev = this_thread;
/* Set up start times */
- gettimeofday(&this_thread->start_time, NULL); /* Time this thread started */
- memcpy(&this_thread->last_state_change, &this_thread->start_time, sizeof(struct timeval)); /* Changed state so mark it. */
+ gettimeofday(&this_thread->start_time, NULL); /* Time this thread started */
+ memcpy(&this_thread->last_state_change, &this_thread->start_time, sizeof (struct timeval)); /* Changed state so mark it. */
}
/*
* A function to update a threads load averages
*/
-void ctdl_thread_internal_update_avgs(CtdlThreadNode * this_thread)
-{
+ void ctdl_thread_internal_update_avgs(CtdlThreadNode *this_thread)
+ {
struct timeval now, result;
double last_duration;
/* I don't think these mutex's are needed here */
citthread_mutex_lock(&this_thread->ThreadMutex);
// result now has a timeval for the time we spent in the last state since we last updated
- last_duration =
- (double) result.tv_sec +
- ((double) result.tv_usec / (double) 1000000);
+ last_duration = (double)result.tv_sec + ((double)result.tv_usec / (double) 1000000);
if (this_thread->state == CTDL_THREAD_SLEEPING)
this_thread->avg_sleeping += last_duration;
if (this_thread->state == CTDL_THREAD_RUNNING)
this_thread->avg_running += last_duration;
if (this_thread->state == CTDL_THREAD_BLOCKED)
this_thread->avg_blocked += last_duration;
- memcpy(&this_thread->last_state_change, &now,
- sizeof(struct timeval));
+ memcpy (&this_thread->last_state_change, &now, sizeof (struct timeval));
citthread_mutex_unlock(&this_thread->ThreadMutex);
}
/*
* A function to chenge the state of a thread
*/
-void ctdl_thread_internal_change_state(CtdlThreadNode * this_thread,
- enum CtdlThreadState new_state)
+void ctdl_thread_internal_change_state (CtdlThreadNode *this_thread, enum CtdlThreadState new_state)
{
/*
* Wether we change state or not we need update the load values
*/
ctdl_thread_internal_update_avgs(this_thread);
/* This mutex not needed here? */
- citthread_mutex_lock(&this_thread->ThreadMutex); /* To prevent race condition of a sleeping thread */
- if ((new_state == CTDL_THREAD_STOP_REQ)
- && (this_thread->state > CTDL_THREAD_STOP_REQ))
+ citthread_mutex_lock(&this_thread->ThreadMutex); /* To prevent race condition of a sleeping thread */
+ if ((new_state == CTDL_THREAD_STOP_REQ) && (this_thread->state > CTDL_THREAD_STOP_REQ))
this_thread->state = new_state;
- if (((new_state == CTDL_THREAD_SLEEPING)
- || (new_state == CTDL_THREAD_BLOCKED))
- && (this_thread->state == CTDL_THREAD_RUNNING))
+ if (((new_state == CTDL_THREAD_SLEEPING) || (new_state == CTDL_THREAD_BLOCKED)) && (this_thread->state == CTDL_THREAD_RUNNING))
this_thread->state = new_state;
- if ((new_state == CTDL_THREAD_RUNNING)
- && ((this_thread->state == CTDL_THREAD_SLEEPING)
- || (this_thread->state == CTDL_THREAD_BLOCKED)))
+ if ((new_state == CTDL_THREAD_RUNNING) && ((this_thread->state == CTDL_THREAD_SLEEPING) || (this_thread->state == CTDL_THREAD_BLOCKED)))
this_thread->state = new_state;
citthread_mutex_unlock(&this_thread->ThreadMutex);
}
*/
void CtdlThreadStopAll(void)
{
+ /* First run any registered shutdown hooks. This probably doesn't belong here. */
+ PerformSessionHooks(EVT_SHUTDOWN);
+
+ /* then close all tcp ports so nobody else can talk to us anymore. */
+ CtdlShutdownServiceHooks();
//FIXME: The signalling of the condition should not be in the critical_section
// We need to build a list of threads we are going to signal and then signal them afterwards
+
+ ShutDownEventQueue();
CtdlThreadNode *this_thread;
-
+
begin_critical_section(S_THREAD_LIST);
this_thread = CtdlThreadList;
- while (this_thread) {
-#ifdef THREADS_USESIGNALS
- citthread_killl(this_thread->tid, SIGHUP);
-#endif
- citthread_kill(this_thread->tid, SIGUSR1);
- ctdl_thread_internal_change_state(this_thread,
- CTDL_THREAD_STOP_REQ);
+ // Ask the GC thread to stop first so everything knows we are shutting down.
+ GC_thread->state = CTDL_THREAD_STOP_REQ;
+ while(this_thread)
+ {
+ if (!citthread_equal(this_thread->tid, GC_thread->tid))
+ citthread_kill(this_thread->tid, SIGHUP);
+
+ ctdl_thread_internal_change_state (this_thread, CTDL_THREAD_STOP_REQ);
citthread_cond_signal(&this_thread->ThreadCond);
citthread_cond_signal(&this_thread->SleepCond);
- CtdlLogPrintf(CTDL_DEBUG,
- "Thread system stopping thread \"%s\" (%ld).\n",
- this_thread->name, this_thread->tid);
+ this_thread->stop_ticker = time(NULL);
+ CtdlLogPrintf(CTDL_DEBUG, "Thread system stopping thread \"%s\" (0x%08lx).\n",
+ this_thread->name, this_thread->tid);
this_thread = this_thread->next;
}
end_critical_section(S_THREAD_LIST);
- citthread_cond_broadcast(&worker_block);
}
void CtdlThreadWakeAll(void)
{
CtdlThreadNode *this_thread;
-
+
CtdlLogPrintf(CTDL_DEBUG, "Thread system waking all threads.\n");
-
+
begin_critical_section(S_THREAD_LIST);
this_thread = CtdlThreadList;
- while (this_thread) {
- if (!this_thread->thread_func) {
+ while(this_thread)
+ {
+ if (!this_thread->thread_func)
+ {
citthread_cond_signal(&this_thread->ThreadCond);
citthread_cond_signal(&this_thread->SleepCond);
}
*/
int CtdlThreadGetCount(void)
{
- return num_threads;
+ return num_threads;
}
int CtdlThreadGetWorkers(void)
{
- return num_workers;
+ return num_workers;
}
double CtdlThreadGetWorkerAvg(void)
{
double ret;
-
+
begin_critical_section(S_THREAD_LIST);
- ret = CtdlThreadWorkerAvg;
+ ret = CtdlThreadWorkerAvg;
end_critical_section(S_THREAD_LIST);
return ret;
}
double CtdlThreadGetLoadAvg(void)
{
- double ret;
+ double load_avg[3] = {0.0, 0.0, 0.0};
+
+ int ret = 0;
+ int smp_num_cpus;
+
+ /* Borrowed this straight from procps */
+ smp_num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+ if(smp_num_cpus<1) smp_num_cpus=1; /* SPARC glibc is buggy */
+
+#ifdef HAVE_GETLOADAVG
+ ret = getloadavg(load_avg, 3);
+#endif
+ if (ret < 0)
+ return 0;
+ return load_avg[0] / smp_num_cpus;
+/*
+ * This old chunk of code return a value that indicated the load on citserver
+ * This value could easily reach 100 % even when citserver was doing very little and
+ * hence the machine has much more spare capacity.
+ * Because this value was used to determine if the machine was under heavy load conditions
+ * from other processes in the system then citserver could be strangled un-necesarily
+ * What we are actually trying to achieve is to strangle citserver if the machine is heavily loaded.
+ * So we have changed this.
begin_critical_section(S_THREAD_LIST);
- ret = CtdlThreadLoadAvg;
+ ret = CtdlThreadLoadAvg;
end_critical_section(S_THREAD_LIST);
return ret;
+*/
}
const char *CtdlThreadName(const char *name)
{
const char *old_name;
-
- if (!CT) {
- CtdlLogPrintf(CTDL_WARNING,
- "Thread system WARNING. Attempt to CtdlThreadRename() a non thread. %s\n",
- name);
+
+ if (!CT)
+ {
+ CtdlLogPrintf(CTDL_WARNING, "Thread system WARNING. Attempt to CtdlThreadRename() a non thread. %s\n", name);
return NULL;
}
old_name = CT->name;
if (name)
CT->name = name;
return (old_name);
-}
+}
/*
* A function to force a thread to exit
*/
-void CtdlThreadCancel(CtdlThreadNode * thread)
+void CtdlThreadCancel(CtdlThreadNode *thread)
{
CtdlThreadNode *this_thread;
-
+
if (!thread)
this_thread = CT;
else
this_thread = thread;
- if (!this_thread) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system PANIC. Attempt to CtdlThreadCancel() a non thread.\n");
+ if (!this_thread)
+ {
+ CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC. Attempt to CtdlThreadCancel() a non thread.\n");
CtdlThreadStopAll();
return;
}
-
- if (!this_thread->thread_func) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system PANIC. Attempt to CtdlThreadCancel() the garbage collector.\n");
+
+ if (!this_thread->thread_func)
+ {
+ CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC. Attempt to CtdlThreadCancel() the garbage collector.\n");
CtdlThreadStopAll();
return;
}
-
- ctdl_thread_internal_change_state(this_thread,
- CTDL_THREAD_CANCELLED);
+
+ ctdl_thread_internal_change_state (this_thread, CTDL_THREAD_CANCELLED);
citthread_cancel(this_thread->tid);
}
int CtdlThreadCheckStop(void)
{
int state;
-
- if (!CT) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system PANIC, CtdlThreadCheckStop() called by a non thread.\n");
+
+ if (!CT)
+ {
+ CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC, CtdlThreadCheckStop() called by a non thread.\n");
CtdlThreadStopAll();
return -1;
}
-
+
state = CT->state;
-#ifdef THREADS_USERSIGNALS
if (CT->signal)
- CtdlLogPrintf(CTDL_DEBUG,
- "Thread \"%s\" caught signal %d.\n",
- CT->name, CT->signal);
-#endif
- if (state == CTDL_THREAD_STOP_REQ) {
+ {
+ CtdlLogPrintf(CTDL_DEBUG, "Thread \"%s\" caught signal %d.\n", CT->name, CT->signal);
+ if (CT->signal == SIGHUP)
+ CT->state = CTDL_THREAD_STOP_REQ;
+ CT->signal = 0;
+ }
+ if(state == CTDL_THREAD_STOP_REQ)
+ {
CT->state = CTDL_THREAD_STOPPING;
return -1;
- } else if ((state < CTDL_THREAD_STOP_REQ)
- && (state > CTDL_THREAD_CREATE)) {
+ }
+ else if((state < CTDL_THREAD_STOP_REQ) && (state > CTDL_THREAD_CREATE))
+ {
return -1;
}
return 0;
* A function to ask a thread to exit
* The thread must call CtdlThreadCheckStop() periodically to determine if it should exit
*/
-void CtdlThreadStop(CtdlThreadNode * thread)
+void CtdlThreadStop(CtdlThreadNode *thread)
{
CtdlThreadNode *this_thread;
-
+
if (!thread)
this_thread = CT;
else
if (!this_thread)
return;
if (!(this_thread->thread_func))
- return; // Don't stop garbage collector
-#ifdef THREADS_USESIGNALS
- citthread_kill(this_thread->tid, SIGHUP);
-#endif
- ctdl_thread_internal_change_state(this_thread,
- CTDL_THREAD_STOP_REQ);
+ return; // Don't stop garbage collector
+
+ if (!citthread_equal(this_thread->tid, GC_thread->tid))
+ citthread_kill(this_thread->tid, SIGHUP);
+
+ ctdl_thread_internal_change_state (this_thread, CTDL_THREAD_STOP_REQ);
citthread_cond_signal(&this_thread->ThreadCond);
citthread_cond_signal(&this_thread->SleepCond);
+ this_thread->stop_ticker = time(NULL);
}
/*
{
struct timespec wake_time;
struct timeval time_now;
-
-
- if (!CT) {
- CtdlLogPrintf(CTDL_WARNING,
- "CtdlThreadSleep() called by something that is not a thread. Should we die?\n");
+
+
+ if (!CT)
+ {
+ CtdlLogPrintf(CTDL_WARNING, "CtdlThreadSleep() called by something that is not a thread. Should we die?\n");
return;
}
-
- memset(&wake_time, 0, sizeof(struct timespec));
+
+ memset (&wake_time, 0, sizeof(struct timespec));
gettimeofday(&time_now, NULL);
wake_time.tv_sec = time_now.tv_sec + secs;
wake_time.tv_nsec = time_now.tv_usec * 10;
- ctdl_thread_internal_change_state(CT, CTDL_THREAD_SLEEPING);
-
- citthread_mutex_lock(&CT->ThreadMutex); /* Prevent something asking us to awaken before we've gone to sleep */
- citthread_cond_timedwait(&CT->SleepCond, &CT->ThreadMutex,
- &wake_time);
+ ctdl_thread_internal_change_state (CT, CTDL_THREAD_SLEEPING);
+
+ citthread_mutex_lock(&CT->ThreadMutex); /* Prevent something asking us to awaken before we've gone to sleep */
+ citthread_cond_timedwait(&CT->SleepCond, &CT->ThreadMutex, &wake_time);
citthread_mutex_unlock(&CT->ThreadMutex);
-
- ctdl_thread_internal_change_state(CT, CTDL_THREAD_RUNNING);
+
+ ctdl_thread_internal_change_state (CT, CTDL_THREAD_RUNNING);
}
* In here we were called by the current thread because it is exiting
* NB. WE ARE THE CURRENT THREAD
*/
- CtdlLogPrintf(CTDL_NOTICE, "Thread \"%s\" (%ld) exited.\n",
- CT->name, CT->tid);
-
-#ifdef HAVE_BACKTRACE
- eCrash_UnregisterThread();
-#endif
+ if (CT)
+ {
+ const char *name = CT->name;
+ const pid_t tid = CT->tid;
+ CtdlLogPrintf(CTDL_NOTICE, "Thread \"%s\" (0x%08lx) exited.\n", name, (unsigned long) tid);
+ }
+ else
+ {
+ CtdlLogPrintf(CTDL_NOTICE, "some ((unknown ? ? ?) Thread exited.\n");
+ }
+
+ #ifdef HAVE_BACKTRACE
+/// eCrash_UnregisterThread();
+ #endif
+
citthread_mutex_lock(&CT->ThreadMutex);
CT->state = CTDL_THREAD_EXITED; // needs to be last thing else house keeping will unlink us too early
citthread_mutex_unlock(&CT->ThreadMutex);
that_thread = CtdlThreadList;
load_avg = 0;
worker_avg = 0;
- while (that_thread) {
+ while(that_thread)
+ {
/* Update load averages */
ctdl_thread_internal_update_avgs(that_thread);
citthread_mutex_lock(&that_thread->ThreadMutex);
- that_thread->load_avg =
- (that_thread->avg_sleeping +
- that_thread->avg_running) /
- (that_thread->avg_sleeping + that_thread->avg_running +
- that_thread->avg_blocked) * 100;
+ that_thread->load_avg = (that_thread->avg_sleeping + that_thread->avg_running) / (that_thread->avg_sleeping + that_thread->avg_running + that_thread->avg_blocked) * 100;
that_thread->avg_sleeping /= 2;
that_thread->avg_running /= 2;
that_thread->avg_blocked /= 2;
load_avg += that_thread->load_avg;
- if (that_thread->flags & CTDLTHREAD_WORKER) {
+ if (that_thread->flags & CTDLTHREAD_WORKER)
+ {
worker_avg += that_thread->load_avg;
workers++;
}
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_DEBUG,
- "CtdlThread, \"%s\" (%lu) \"%s\" %.2f %.2f %.2f %.2f\n",
- that_thread->name, that_thread->tid,
- CtdlThreadStates[that_thread->state],
- that_thread->avg_sleeping,
- that_thread->avg_running,
- that_thread->avg_blocked,
- that_thread->load_avg);
+ CtdlLogPrintf(CTDL_DEBUG, "CtdlThread, \"%s\" (%lu) \"%s\" %.2f %.2f %.2f %.2f\n",
+ that_thread->name,
+ that_thread->tid,
+ CtdlThreadStates[that_thread->state],
+ that_thread->avg_sleeping,
+ that_thread->avg_running,
+ that_thread->avg_blocked,
+ that_thread->load_avg);
#endif
citthread_mutex_unlock(&that_thread->ThreadMutex);
that_thread = that_thread->next;
}
- CtdlThreadLoadAvg = load_avg / num_threads;
- CtdlThreadWorkerAvg = worker_avg / workers;
+ CtdlThreadLoadAvg = load_avg/num_threads;
+ CtdlThreadWorkerAvg = worker_avg/workers;
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_INFO,
- "System load average %.2f, workers averag %.2f, threads %d, workers %d, sessions %d\n",
- CtdlThreadLoadAvg, CtdlThreadWorkerAvg, num_threads,
- num_workers, num_sessions);
+ CtdlLogPrintf(CTDL_INFO, "System load average %.2f, workers averag %.2f, threads %d, workers %d, sessions %d\n", CtdlThreadGetLoadAvg(), CtdlThreadWorkerAvg, num_threads, num_workers, num_sessions);
#endif
}
* Garbage collection routine.
* Gets called by main() in a loop to clean up the thread list periodically.
*/
-void CtdlThreadGC(void)
+void CtdlThreadGC (void)
{
CtdlThreadNode *this_thread, *that_thread;
int workers = 0, sys_workers;
- int ret = 0;
+ int ret=0;
begin_critical_section(S_THREAD_LIST);
-
+
/* Handle exiting of garbage collector thread */
- if (num_threads == 1)
+ if(num_threads == 1)
CtdlThreadList->state = CTDL_THREAD_EXITED;
-
+
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_DEBUG,
- "Thread system running garbage collection.\n");
+ CtdlLogPrintf(CTDL_DEBUG, "Thread system running garbage collection.\n");
#endif
/*
* Woke up to do garbage collection
*/
this_thread = CtdlThreadList;
- while (this_thread) {
+ while(this_thread)
+ {
that_thread = this_thread;
this_thread = this_thread->next;
-
+
+ if ((that_thread->state == CTDL_THREAD_STOP_REQ || that_thread->state == CTDL_THREAD_STOPPING)
+ && (!citthread_equal(that_thread->tid, citthread_self())))
+ {
+ CtdlLogPrintf(CTDL_DEBUG, "Waiting for thread %s (0x%08lx) to exit.\n", that_thread->name, that_thread->tid);
+ terminate_stuck_sessions();
+ }
+ else
+ {
+ /**
+ * Catch the situation where a worker was asked to stop but couldn't and we are not
+ * shutting down.
+ */
+ that_thread->stop_ticker = 0;
+ }
+
+ if (that_thread->stop_ticker + 5 == time(NULL))
+ {
+ CtdlLogPrintf(CTDL_DEBUG, "Thread System: The thread \"%s\" (0x%08lx) failed to self terminate within 5 ticks. It would be cancelled now.\n", that_thread->name, that_thread->tid);
+ if ((that_thread->flags & CTDLTHREAD_WORKER) == 0)
+ CtdlLogPrintf(CTDL_INFO, "Thread System: A non worker thread would have been canceled this may cause message loss.\n");
+// that_thread->state = CTDL_THREAD_CANCELLED;
+ that_thread->stop_ticker++;
+// citthread_cancel(that_thread->tid);
+// continue;
+ }
+
/* Do we need to clean up this thread? */
- if (that_thread->state != CTDL_THREAD_EXITED) {
- if (that_thread->flags & CTDLTHREAD_WORKER)
+ if ((that_thread->state != CTDL_THREAD_EXITED) && (that_thread->state != CTDL_THREAD_CANCELLED))
+ {
+ if(that_thread->flags & CTDLTHREAD_WORKER)
workers++; /* Sanity check on number of worker threads */
continue;
}
-
- if (citthread_equal(that_thread->tid, citthread_self()) && that_thread->thread_func) { /* Sanity check */
+
+ if (citthread_equal(that_thread->tid, citthread_self()) && that_thread->thread_func)
+ { /* Sanity check */
end_critical_section(S_THREAD_LIST);
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system PANIC, a thread is trying to clean up after itself.\n");
+ CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC, a thread is trying to clean up after itself.\n");
abort();
return;
}
-
- if (num_threads <= 0) { /* Sanity check */
+
+ if (num_threads <= 0)
+ { /* Sanity check */
end_critical_section(S_THREAD_LIST);
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system PANIC, num_threads <= 0 and trying to do Garbage Collection.\n");
+ CtdlLogPrintf(CTDL_EMERG, "Thread system PANIC, num_threads <= 0 and trying to do Garbage Collection.\n");
abort();
return;
}
- if (that_thread->flags & CTDLTHREAD_WORKER)
+ if(that_thread->flags & CTDLTHREAD_WORKER)
num_workers--; /* This is a wroker thread so reduce the count. */
num_threads--;
/* If we are unlinking the list head then the next becomes the list head */
- if (that_thread->prev)
+ if(that_thread->prev)
that_thread->prev->next = that_thread->next;
else
CtdlThreadList = that_thread->next;
- if (that_thread->next)
+ if(that_thread->next)
that_thread->next->prev = that_thread->prev;
-
+
citthread_cond_signal(&that_thread->ThreadCond);
citthread_cond_signal(&that_thread->SleepCond); // Make sure this thread is awake
citthread_mutex_lock(&that_thread->ThreadMutex); // Make sure it has done what its doing
* Also makes sure the thread has cleaned up after itself before we remove it from the list
* We can join on the garbage collector thread the join should just return EDEADLCK
*/
- ret = citthread_join(that_thread->tid, NULL);
+ ret = citthread_join (that_thread->tid, NULL);
if (ret == EDEADLK)
- CtdlLogPrintf(CTDL_DEBUG,
- "Garbage collection on own thread.\n");
+ CtdlLogPrintf(CTDL_DEBUG, "Garbage collection on own thread.\n");
else if (ret == EINVAL)
- CtdlLogPrintf(CTDL_DEBUG,
- "Garbage collection, that thread already joined on.\n");
+ CtdlLogPrintf(CTDL_DEBUG, "Garbage collection, that thread already joined on.\n");
else if (ret == ESRCH)
- CtdlLogPrintf(CTDL_DEBUG,
- "Garbage collection, no thread to join on.\n");
+ CtdlLogPrintf(CTDL_DEBUG, "Garbage collection, no thread to join on.\n");
else if (ret != 0)
- CtdlLogPrintf(CTDL_DEBUG,
- "Garbage collection, citthread_join returned an unknown error.\n");
+ CtdlLogPrintf(CTDL_DEBUG, "Garbage collection, citthread_join returned an unknown error(%d).\n", ret);
/*
* Now we own that thread entry
*/
- CtdlLogPrintf(CTDL_INFO,
- "Garbage Collection for thread \"%s\" (%ld).\n",
- that_thread->name, that_thread->tid);
+ CtdlLogPrintf(CTDL_INFO, "Garbage Collection for thread \"%s\" (0x%08lx).\n",
+ that_thread->name, that_thread->tid);
citthread_mutex_destroy(&that_thread->ThreadMutex);
citthread_cond_destroy(&that_thread->ThreadCond);
citthread_mutex_destroy(&that_thread->SleepMutex);
}
sys_workers = num_workers;
end_critical_section(S_THREAD_LIST);
-
+
/* Sanity check number of worker threads */
- if (workers != sys_workers) {
+ if (workers != sys_workers)
+ {
CtdlLogPrintf(CTDL_EMERG,
- "Thread system PANIC, discrepancy in number of worker threads. Counted %d, should be %d.\n",
- workers, sys_workers);
+ "Thread system PANIC, discrepancy in number of worker threads. Counted %d, should be %d.\n",
+ workers, sys_workers
+ );
abort();
}
}
-
+
/*
* Runtime function for a Citadel Thread.
* This initialises the threads environment and then calls the user supplied thread function
* Note that this is the REAL thread function and wraps the users thread function.
- */
-static void *ctdl_internal_thread_func(void *arg)
+ */
+static void *ctdl_internal_thread_func (void *arg)
{
CtdlThreadNode *this_thread;
void *ret = NULL;
*/
begin_critical_section(S_THREAD_LIST);
this_thread = (CtdlThreadNode *) arg;
- gettimeofday(&this_thread->start_time, NULL); /* Time this thread started */
-// citthread_mutex_lock(&this_thread->ThreadMutex);
-
+ gettimeofday(&this_thread->start_time, NULL); /* Time this thread started */
+
// Register the cleanup function to take care of when we exit.
citthread_cleanup_push(ctdl_internal_thread_cleanup, NULL);
// Get our thread data structure
CtdlThreadAllocTSD();
CT = this_thread;
this_thread->pid = getpid();
- memcpy(&this_thread->last_state_change, &this_thread->start_time, sizeof(struct timeval)); /* Changed state so mark it. */
+ memcpy(&this_thread->last_state_change, &this_thread->start_time, sizeof (struct timeval)); /* Changed state so mark it. */
/* Only change to running state if we weren't asked to stop during the create cycle
* Other wise there is a window to allow this threads creation to continue to full grown and
* therby prevent a shutdown of the server.
*/
-// citthread_mutex_unlock(&this_thread->ThreadMutex);
-
- if (!CtdlThreadCheckStop()) {
+ if (!CtdlThreadCheckStop())
+ {
citthread_mutex_lock(&this_thread->ThreadMutex);
this_thread->state = CTDL_THREAD_RUNNING;
citthread_mutex_unlock(&this_thread->ThreadMutex);
}
end_critical_section(S_THREAD_LIST);
-
+
// Register for tracing
-#ifdef HAVE_BACKTRACE
- eCrash_RegisterThread(this_thread->name, 0);
-#endif
-
+ #ifdef HAVE_BACKTRACE
+/// eCrash_RegisterThread(this_thread->name, 0);
+ #endif
+
// Tell the world we are here
- CtdlLogPrintf(CTDL_NOTICE, "Created a new thread \"%s\" (%ld). \n",
- this_thread->name, this_thread->tid);
-
-
-
+#if defined(HAVE_SYSCALL_H) && defined (SYS_gettid)
+ this_thread->reltid = syscall(SYS_gettid);
+#endif
+ CtdlLogPrintf(CTDL_NOTICE, "Created a new thread \"%s\" (0x%08lx).\n",
+ this_thread->name, this_thread->tid);
+
/*
* run the thread to do the work but only if we haven't been asked to stop
*/
if (!CtdlThreadCheckStop())
- ret = (this_thread->thread_func) (this_thread->user_args);
-
+ ret = (this_thread->thread_func)(this_thread->user_args);
+
/*
* Our thread is exiting either because it wanted to end or because the server is stopping
* We need to clean up
*/
citthread_cleanup_pop(1); // Execute our cleanup routine and remove it
-
- return (ret);
+
+ return(ret);
}
/*
* Function to initialise an empty thread structure
*/
-CtdlThreadNode *ctdl_internal_init_thread_struct(CtdlThreadNode *
- this_thread, long flags)
+CtdlThreadNode *ctdl_internal_init_thread_struct(CtdlThreadNode *this_thread, long flags)
{
int ret = 0;
-
+
// Ensuring this is zero'd means we make sure the thread doesn't start doing its thing until we are ready.
- memset(this_thread, 0, sizeof(CtdlThreadNode));
-
+ memset (this_thread, 0, sizeof(CtdlThreadNode));
+
/* Create the mutex's early so we can use them */
- citthread_mutex_init(&(this_thread->ThreadMutex), NULL);
- citthread_cond_init(&(this_thread->ThreadCond), NULL);
- citthread_mutex_init(&(this_thread->SleepMutex), NULL);
- citthread_cond_init(&(this_thread->SleepCond), NULL);
-
+ citthread_mutex_init (&(this_thread->ThreadMutex), NULL);
+ citthread_cond_init (&(this_thread->ThreadCond), NULL);
+ citthread_mutex_init (&(this_thread->SleepMutex), NULL);
+ citthread_cond_init (&(this_thread->SleepCond), NULL);
+
this_thread->state = CTDL_THREAD_CREATE;
-
+
if ((ret = citthread_attr_init(&this_thread->attr))) {
citthread_mutex_unlock(&this_thread->ThreadMutex);
citthread_mutex_destroy(&(this_thread->ThreadMutex));
citthread_cond_destroy(&(this_thread->ThreadCond));
citthread_mutex_destroy(&(this_thread->SleepMutex));
citthread_cond_destroy(&(this_thread->SleepCond));
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, citthread_attr_init: %s\n",
- strerror(ret));
+ CtdlLogPrintf(CTDL_EMERG, "Thread system, citthread_attr_init: %s\n", strerror(ret));
free(this_thread);
return NULL;
}
* otherwise the MIME parser crashes on FreeBSD, and the IMAP service
* crashes on 64-bit Linux.
*/
- if (flags & CTDLTHREAD_BIGSTACK) {
+ if (flags & CTDLTHREAD_BIGSTACK)
+ {
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_INFO,
- "Thread system. Creating BIG STACK thread.\n");
+ CtdlLogPrintf(CTDL_INFO, "Thread system. Creating BIG STACK thread.\n");
#endif
- if ((ret =
- citthread_attr_setstacksize(&this_thread->attr,
- THREADSTACKSIZE))) {
+ if ((ret = citthread_attr_setstacksize(&this_thread->attr, THREADSTACKSIZE))) {
citthread_mutex_unlock(&this_thread->ThreadMutex);
- citthread_mutex_destroy(&
- (this_thread->
- ThreadMutex));
+ citthread_mutex_destroy(&(this_thread->ThreadMutex));
citthread_cond_destroy(&(this_thread->ThreadCond));
- citthread_mutex_destroy(&
- (this_thread->SleepMutex));
+ citthread_mutex_destroy(&(this_thread->SleepMutex));
citthread_cond_destroy(&(this_thread->SleepCond));
citthread_attr_destroy(&this_thread->attr);
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, citthread_attr_setstacksize: %s\n",
- strerror(ret));
+ CtdlLogPrintf(CTDL_EMERG, "Thread system, citthread_attr_setstacksize: %s\n",
+ strerror(ret));
free(this_thread);
return NULL;
}
* because the creation didn't affect the load average.
*/
this_thread->avg_blocked = 2;
-
+
return (this_thread);
}
-
+
/*
* Internal function to create a thread.
- */
-CtdlThreadNode *ctdl_internal_create_thread(char *name, long flags,
- void *(*thread_func) (void
- *arg),
- void *args)
+ */
+CtdlThreadNode *ctdl_internal_create_thread(char *name, long flags, void *(*thread_func) (void *arg), void *args)
{
int ret = 0;
CtdlThreadNode *this_thread;
- if (num_threads >= 32767) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system. Thread list full.\n");
+ if (num_threads >= 32767)
+ {
+ CtdlLogPrintf(CTDL_EMERG, "Thread system. Thread list full.\n");
return NULL;
}
-
+
this_thread = malloc(sizeof(CtdlThreadNode));
if (this_thread == NULL) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, can't allocate CtdlThreadNode, exiting\n");
+ CtdlLogPrintf(CTDL_EMERG, "Thread system, can't allocate CtdlThreadNode, exiting\n");
return NULL;
}
-
+
/* Initialise the thread structure */
- if (ctdl_internal_init_thread_struct(this_thread, flags) == NULL) {
+ if (ctdl_internal_init_thread_struct(this_thread, flags) == NULL)
+ {
free(this_thread);
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, can't initialise CtdlThreadNode, exiting\n");
+ CtdlLogPrintf(CTDL_EMERG, "Thread system, can't initialise CtdlThreadNode, exiting\n");
return NULL;
}
/*
* first because most implimentations of threading can't create it in a stopped state
* and it might want to do things with its structure that aren't initialised otherwise.
*/
- if (name) {
+ if(name)
+ {
this_thread->name = name;
- } else {
+ }
+ else
+ {
this_thread->name = "Un-named Thread";
}
-
+
this_thread->flags = flags;
this_thread->thread_func = thread_func;
this_thread->user_args = args;
-
-// citthread_mutex_lock(&this_thread->ThreadMutex);
-
+
begin_critical_section(S_THREAD_LIST);
/*
* We pass this_thread into the thread as its args so that it can find out information
* about itself and it has a bit of storage space for itself, not to mention that the REAL
* thread function needs to finish off the setup of the structure
*/
- if ((ret =
- citthread_create(&this_thread->tid, &this_thread->attr,
- ctdl_internal_thread_func,
- this_thread) != 0)) {
+ if ((ret = citthread_create(&this_thread->tid, &this_thread->attr, ctdl_internal_thread_func, this_thread) != 0))
+ {
end_critical_section(S_THREAD_LIST);
- CtdlLogPrintf(CTDL_ALERT,
- "Thread system, Can't create thread: %s\n",
- strerror(ret));
+ CtdlLogPrintf(CTDL_ALERT, "Thread system, Can't create thread: %s\n",
+ strerror(ret));
citthread_mutex_unlock(&this_thread->ThreadMutex);
citthread_mutex_destroy(&(this_thread->ThreadMutex));
citthread_cond_destroy(&(this_thread->ThreadCond));
free(this_thread);
return NULL;
}
-
- num_threads++; // Increase the count of threads in the system.
- if (this_thread->flags & CTDLTHREAD_WORKER)
+ num_threads++; // Increase the count of threads in the system.
+ if(this_thread->flags & CTDLTHREAD_WORKER)
num_workers++;
this_thread->next = CtdlThreadList;
if (this_thread->next)
this_thread->next->prev = this_thread;
ctdl_thread_internal_calc_loadavg();
-
-// citthread_mutex_unlock(&this_thread->ThreadMutex);
+
end_critical_section(S_THREAD_LIST);
-
+
return this_thread;
}
* char *name = name to give to thread, if NULL, use generic name
* int flags = flags to determine type of thread and standard facilities
*/
-CtdlThreadNode *CtdlThreadCreate(char *name, long flags,
- void *(*thread_func) (void *arg),
- void *args)
+CtdlThreadNode *CtdlThreadCreate(char *name, long flags, void *(*thread_func) (void *arg), void *args)
{
CtdlThreadNode *ret = NULL;
-
+
ret = ctdl_internal_create_thread(name, flags, thread_func, args);
return ret;
}
-/*
- * Internal function to schedule a thread.
- * Must be called from within a S_THREAD_LIST critical section
- */
-CtdlThreadNode *CtdlThreadSchedule(char *name, long flags,
- void *(*thread_func) (void *arg),
- void *args, time_t when)
-{
- CtdlThreadNode *this_thread;
-
- if (num_threads >= 32767) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system. Thread list full.\n");
- return NULL;
- }
-
- this_thread = malloc(sizeof(CtdlThreadNode));
- if (this_thread == NULL) {
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, can't allocate CtdlThreadNode, exiting\n");
- return NULL;
- }
- /* Initialise the thread structure */
- if (ctdl_internal_init_thread_struct(this_thread, flags) == NULL) {
- free(this_thread);
- CtdlLogPrintf(CTDL_EMERG,
- "Thread system, can't initialise CtdlThreadNode, exiting\n");
- return NULL;
- }
-
- /*
- * If we got here we are going to create the thread so we must initilise the structure
- * first because most implimentations of threading can't create it in a stopped state
- * and it might want to do things with its structure that aren't initialised otherwise.
- */
- if (name) {
- this_thread->name = name;
- } else {
- this_thread->name = "Un-named Thread";
- }
-
- this_thread->flags = flags;
- this_thread->thread_func = thread_func;
- this_thread->user_args = args;
-
- /*
- * When to start this thread
- */
- this_thread->when = when;
-
- begin_critical_section(S_SCHEDULE_LIST);
- this_thread->next = CtdlThreadSchedList;
- CtdlThreadSchedList = this_thread;
- if (this_thread->next)
- this_thread->next->prev = this_thread;
- end_critical_section(S_SCHEDULE_LIST);
-
- return this_thread;
-}
-
-
-
-CtdlThreadNode *ctdl_thread_internal_start_scheduled(CtdlThreadNode *
- this_thread)
+CtdlThreadNode *ctdl_thread_internal_start_scheduled (CtdlThreadNode *this_thread)
{
int ret = 0;
-
-// citthread_mutex_lock(&that_thread->ThreadMutex);
+
begin_critical_section(S_THREAD_LIST);
/*
* We pass this_thread into the thread as its args so that it can find out information
* about itself and it has a bit of storage space for itself, not to mention that the REAL
* thread function needs to finish off the setup of the structure
*/
- if ((ret =
- citthread_create(&this_thread->tid, &this_thread->attr,
- ctdl_internal_thread_func,
- this_thread) != 0)) {
+ if ((ret = citthread_create(&this_thread->tid, &this_thread->attr, ctdl_internal_thread_func, this_thread) != 0))
+ {
end_critical_section(S_THREAD_LIST);
- CtdlLogPrintf(CTDL_DEBUG,
- "Failed to start scheduled thread \"%s\": %s\n",
- this_thread->name, strerror(ret));
-// citthread_mutex_unlock(&this_thread->ThreadMutex);
+ CtdlLogPrintf(CTDL_DEBUG, "Failed to start scheduled thread \"%s\": %s\n", this_thread->name, strerror(ret));
citthread_mutex_destroy(&(this_thread->ThreadMutex));
citthread_cond_destroy(&(this_thread->ThreadCond));
citthread_mutex_destroy(&(this_thread->SleepMutex));
free(this_thread);
return NULL;
}
-
-
- num_threads++; // Increase the count of threads in the system.
- if (this_thread->flags & CTDLTHREAD_WORKER)
+
+
+ num_threads++; // Increase the count of threads in the system.
+ if(this_thread->flags & CTDLTHREAD_WORKER)
num_workers++;
this_thread->next = CtdlThreadList;
CtdlThreadList = this_thread;
if (this_thread->next)
this_thread->next->prev = this_thread;
-// citthread_mutex_unlock(&that_thread->ThreadMutex);
-
+
ctdl_thread_internal_calc_loadavg();
end_critical_section(S_THREAD_LIST);
-
-
+
+
return this_thread;
}
{
CtdlThreadNode *this_thread, *that_thread;
time_t now;
-
+
+ /* Don't start scheduled threads if the system wants single user mode */
+ if (CtdlWantSingleUser())
+ return;
+
if (try_critical_section(S_SCHEDULE_LIST))
- return; /* If this list is locked we wait till the next chance */
-
+ return; /* If this list is locked we wait till the next chance */
+
now = time(NULL);
-
+
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_DEBUG,
- "Checking for scheduled threads to start.\n");
+ CtdlLogPrintf(CTDL_DEBUG, "Checking for scheduled threads to start.\n");
#endif
this_thread = CtdlThreadSchedList;
- while (this_thread) {
+ while(this_thread)
+ {
that_thread = this_thread;
this_thread = this_thread->next;
-
- if (now > that_thread->when) {
+
+ if (now > that_thread->when)
+ {
/* Unlink from schedule list */
if (that_thread->prev)
- that_thread->prev->next =
- that_thread->next;
+ that_thread->prev->next = that_thread->next;
else
CtdlThreadSchedList = that_thread->next;
if (that_thread->next)
- that_thread->next->prev =
- that_thread->prev;
-
+ that_thread->next->prev = that_thread->prev;
+
that_thread->next = that_thread->prev = NULL;
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_DEBUG,
- "About to start scheduled thread \"%s\".\n",
- that_thread->name);
+ CtdlLogPrintf(CTDL_DEBUG, "About to start scheduled thread \"%s\".\n", that_thread->name);
#endif
- if (CT->state > CTDL_THREAD_STOP_REQ) { /* Only start it if the system is not stopping */
- if (ctdl_thread_internal_start_scheduled
- (that_thread)) {
+ if (CT->state > CTDL_THREAD_STOP_REQ)
+ { /* Only start it if the system is not stopping */
+ if (ctdl_thread_internal_start_scheduled (that_thread))
+ {
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_INFO,
- "Thread system, Started a scheduled thread \"%s\" (%ud).\n",
- that_thread->name,
- that_thread->tid);
+ CtdlLogPrintf(CTDL_INFO, "Thread system, Started a scheduled thread \"%s\" (0x%08lx).\n",
+ that_thread->name, that_thread->tid);
#endif
}
}
}
#ifdef WITH_THREADLOG
- else {
- CtdlLogPrintf(CTDL_DEBUG,
- "Thread \"%s\" will start in %ld seconds.\n",
- that_thread->name,
- that_thread->when - time(NULL));
+ else
+ {
+ CtdlLogPrintf(CTDL_DEBUG, "Thread \"%s\" will start in %ld seconds.\n",
+ that_thread->name, that_thread->when - time(NULL));
}
#endif
}
/*
* A warapper function for select so we can show a thread as blocked
*/
-int CtdlThreadSelect(int n, fd_set * readfds, fd_set * writefds,
- fd_set * exceptfds, struct timeval *timeout)
+int CtdlThreadSelect(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
{
- int ret;
-
+ int ret = 0;
+
ctdl_thread_internal_change_state(CT, CTDL_THREAD_BLOCKED);
- ret = select(n, readfds, writefds, exceptfds, timeout);
+ if (!CtdlThreadCheckStop())
+ ret = select(n, readfds, writefds, exceptfds, timeout);
+ /**
+ * If the select returned <= 0 then it failed due to an error
+ * or timeout so this thread could stop if asked to do so.
+ * Anything else means it needs to continue unless the system is shutting down
+ */
+ if (ret > 0)
+ {
+ /**
+ * The select says this thread needs to do something useful.
+ * This thread was in an idle state so it may have been asked to stop
+ * but if the system isn't shutting down this thread is no longer
+ * idle and select has given it a task to do so it must not stop
+ * In this condition we need to force it into the running state.
+ * CtdlThreadGC will clear its ticker for us.
+ *
+ * FIXME: there is still a small hole here. It is possible for the sequence of locking
+ * to allow the state to get changed to STOP_REQ just after this code if the other thread
+ * has decided to change the state before this lock, it there fore has to wait till the lock
+ * completes but it will continue to change the state. We need something a bit better here.
+ */
+ citthread_mutex_lock(&CT->ThreadMutex); /* To prevent race condition of a sleeping thread */
+ if (GC_thread->state > CTDL_THREAD_STOP_REQ && CT->state <= CTDL_THREAD_STOP_REQ)
+ {
+ CtdlLogPrintf(CTDL_DEBUG, "Thread %s (0x%08lx) refused stop request.\n", CT->name, CT->tid);
+ CT->state = CTDL_THREAD_RUNNING;
+ }
+ citthread_mutex_unlock(&CT->ThreadMutex);
+ }
+
ctdl_thread_internal_change_state(CT, CTDL_THREAD_RUNNING);
+
return ret;
}
void *new_worker_thread(void *arg);
-extern void close_masters(void);
-void *select_on_master(void *args);
-void *select_on_client(void *args);
-CtdlThreadNode *client_select_thread;
-CtdlThreadNode *master_select_thread;
+extern void close_masters (void);
+
+
+void *simulation_worker (void*arg) {
+ struct CitContext *this;
+
+ this = CreateNewContext();
+ CtdlThreadSleep(1);
+ this->kill_me = 1;
+ this->state = CON_IDLE;
+ dead_session_purge(1);
+ begin_critical_section(S_SESSION_TABLE);
+ stats_done++;
+ end_critical_section(S_SESSION_TABLE);
+ return NULL;
+}
+
+
+void *simulation_thread (void *arg)
+{
+ long stats = statcount;
+
+ while(stats && !CtdlThreadCheckStop()) {
+ CtdlThreadCreate("Connection simulation worker", CTDLTHREAD_BIGSTACK, simulation_worker, NULL);
+ stats--;
+ }
+ CtdlThreadStopAll();
+ return NULL;
+}
void go_threading(void)
{
int i;
CtdlThreadNode *last_worker;
+ struct timeval start, now, result;
+ double last_duration;
/*
* Initialise the thread system
ctdl_thread_internal_init();
/* Second call to module init functions now that threading is up */
- initialise_modules(1);
-
-
- CtdlThreadCreate("House keeping",
- CTDLTHREAD_BIGSTACK,
- do_housekeeping, NULL);
+ if (!statcount) {
+ initialise_modules(1);
+ CtdlThreadCreate("select_on_master", CTDLTHREAD_BIGSTACK, select_on_master, NULL);
+ }
+ else {
+ CtdlLogPrintf(CTDL_EMERG, "Running connection simulation stats\n");
+ gettimeofday(&start, NULL);
+ CtdlThreadCreate("Connection simulation master", CTDLTHREAD_BIGSTACK, simulation_thread, NULL);
+ }
-
-#ifdef NEW_WORKER
- master_select_thread = CtdlThreadCreate ("Select on Master", 0, select_on_master, NULL);
- client_select_thread = CtdlThreadCreate ("Select on client", 0, select_on_client, NULL);
-#endif
/*
* This thread is now used for garbage collection of other threads in the thread list
*/
- CtdlLogPrintf(CTDL_INFO,
- "Startup thread %d becoming garbage collector,\n",
- citthread_self());
+ CtdlLogPrintf(CTDL_INFO, "Startup thread %ld becoming garbage collector,\n", (long) citthread_self());
/*
* We do a lot of locking and unlocking of the thread list in here.
* that may be waiting on the thread list.
* We are a low priority thread so we can afford to do this
*/
-
- while (CtdlThreadGetCount()) {
+
+ while (CtdlThreadGetCount())
+ {
if (CT->signal)
exit_signal = CT->signal;
- if (exit_signal) {
+ if (exit_signal)
+ {
CtdlThreadStopAll();
-// close_masters();
}
check_sched_shutdown();
- if (CT->state > CTDL_THREAD_STOP_REQ) {
+ if (CT->state > CTDL_THREAD_STOP_REQ)
+ {
begin_critical_section(S_THREAD_LIST);
ctdl_thread_internal_calc_loadavg();
end_critical_section(S_THREAD_LIST);
-
- ctdl_thread_internal_check_scheduled(); /* start scheduled threads */
+
+ ctdl_thread_internal_check_scheduled(); /* start scheduled threads */
}
-
+
/* Reduce the size of the worker thread pool if necessary. */
- if ((CtdlThreadGetWorkers() > config.c_min_workers + 1)
- && (CtdlThreadWorkerAvg < 20)
- && (CT->state > CTDL_THREAD_STOP_REQ)) {
+ if ((CtdlThreadGetWorkers() > config.c_min_workers + 1) && (CtdlThreadWorkerAvg < 20) && (CT->state > CTDL_THREAD_STOP_REQ))
+ {
/* Ask a worker thread to stop as we no longer need it */
begin_critical_section(S_THREAD_LIST);
last_worker = CtdlThreadList;
- while (last_worker) {
- citthread_mutex_lock(&last_worker->
- ThreadMutex);
- if (last_worker->flags & CTDLTHREAD_WORKER
- && (last_worker->state >
- CTDL_THREAD_STOPPING)
- && (last_worker->Context == NULL)) {
- citthread_mutex_unlock
- (&last_worker->ThreadMutex);
+ while (last_worker)
+ {
+ citthread_mutex_lock(&last_worker->ThreadMutex);
+ if (last_worker->flags & CTDLTHREAD_WORKER && (last_worker->state > CTDL_THREAD_STOPPING) && (last_worker->Context == NULL))
+ {
+ citthread_mutex_unlock(&last_worker->ThreadMutex);
break;
}
- citthread_mutex_unlock(&last_worker->
- ThreadMutex);
+ citthread_mutex_unlock(&last_worker->ThreadMutex);
last_worker = last_worker->next;
}
end_critical_section(S_THREAD_LIST);
- if (last_worker) {
+ if (last_worker)
+ {
#ifdef WITH_THREADLOG
- CtdlLogPrintf(CTDL_DEBUG,
- "Thread system, stopping excess worker thread \"%s\" (%ld).\n",
- last_worker->name,
- last_worker->tid);
+ CtdlLogPrintf(CTDL_DEBUG, "Thread system, stopping excess worker thread \"%s\" (0x%08lx).\n",
+ last_worker->name,
+ last_worker->tid
+ );
#endif
CtdlThreadStop(last_worker);
}
}
-
+
/*
* If all our workers are working hard, start some more to help out
* with things
/* FIXME: come up with a better way to dynamically alter the number of threads
* based on the system load
*/
-#ifdef NEW_WORKER
- if ((((CtdlThreadGetWorkers() < config.c_max_workers)
- && (CtdlThreadGetWorkers() <= num_sessions))
- || CtdlThreadGetWorkers() < config.c_min_workers)
- && (CT->state > CTDL_THREAD_STOP_REQ))
-#else
- if ((((CtdlThreadGetWorkers() < config.c_max_workers)
- && (CtdlThreadGetWorkerAvg() > 60)
- && (CtdlThreadGetLoadAvg() < 90))
- || CtdlThreadGetWorkers() < config.c_min_workers)
- && (CT->state > CTDL_THREAD_STOP_REQ))
-#endif /* NEW_WORKER */
+ if (!statcount) {
+ if ((((CtdlThreadGetWorkers() < config.c_max_workers) && (CtdlThreadGetWorkerAvg() > 60)) || CtdlThreadGetWorkers() < config.c_min_workers) && (CT->state > CTDL_THREAD_STOP_REQ))
{
- for (i = 0; i < 5; i++) {
-#ifdef NEW_WORKER
- CtdlThreadCreate("Worker Thread (new)",
- CTDLTHREAD_BIGSTACK +
- CTDLTHREAD_WORKER,
- new_worker_thread, NULL);
-#else
- CtdlThreadCreate("Worker Thread",
- CTDLTHREAD_BIGSTACK +
- CTDLTHREAD_WORKER,
- worker_thread, NULL);
-#endif /* NEW_WORKER */
+ /* Only start new threads if we are not going to overload the machine */
+ /* Temporarily set to 10 should be enough to make sure we don't stranglew the server
+ * at least until we make this a config option */
+ if (CtdlThreadGetLoadAvg() < ((double)10.00)) {
+ for (i=0; i<5 ; i++) {
+ CtdlThreadCreate("Worker Thread",
+ CTDLTHREAD_BIGSTACK + CTDLTHREAD_WORKER,
+ worker_thread,
+ NULL
+ );
+ }
}
+ else
+ CtdlLogPrintf (CTDL_WARNING, "Server strangled due to machine load average too high.\n");
+ }
}
CtdlThreadGC();
- if (CtdlThreadGetCount() <= 1) // Shutting down clean up the garbage collector
+ if (CtdlThreadGetCount() <= 1) // Shutting down clean up the garbage collector
{
CtdlThreadGC();
}
-
+
+#ifdef THREADS_USESIGNALS
+ if (CtdlThreadGetCount() && CT->state > CTDL_THREAD_STOP_REQ)
+#else
if (CtdlThreadGetCount())
+#endif
CtdlThreadSleep(1);
}
/*
* If the above loop exits we must be shutting down since we obviously have no threads
*/
ctdl_thread_internal_cleanup();
-}
-
-
-
-
-
-/*
- * Starting a new implimentation of a worker thread.
- * This new implimentation will be faster and do more work per thread.
- */
-
-// TODO: need to sort out the thread states and signals
-// TODO: slect_on_master should not be a big stack thread.
-// TODO: slect_on_client should not be a big stack thread.
-// TODO: select_on_master is not a worker thread and should be blocked when in select
-// TODO: select_on_client is not a worker thread and should be blocked when in select
-/**
- * Select on master socket.
- * One specific thread comes in here and never leaves.
- * This thread blocks on select until something happens.
- * The select only returns if a new connection is made or the select is interrupted by some means.
- * We need to interrupt the select if the list of ServiceHook's changes or we are shutting down.
- * We should probably use a signal to interrupt the select is a ServiceHook is created.
- * When a ServiceHook is destroyed its socket will close which will awaken the select.
- */
-void *select_on_master(void *arg)
-{
- fd_set readfds;
- struct ServiceFunctionHook *serviceptr;
- int ssock; /* Descriptor for client socket */
- int highest;
- int m, i;
- int retval = 0;
- struct CitContext *con;
-
-
-
- while (!CtdlThreadCheckStop()) {
- CtdlThreadName("select_on_master");
-
- /* Initialize the fdset. */
- FD_ZERO(&readfds);
- highest = 0;
-
- /* First, add the various master sockets to the fdset. */
- for (serviceptr = ServiceHookTable; serviceptr != NULL;
- serviceptr = serviceptr->next) {
- m = serviceptr->msock;
- FD_SET(m, &readfds);
- if (m > highest) {
- highest = m;
- }
- }
-
- /** We can block indefinately since something will wake us up eventually
- * Even if it is a signal telling us the system is shutting down
- */
- retval =
- CtdlThreadSelect(highest + 1, &readfds, NULL, NULL,
- NULL);
-
- /** Select got an error or we are shutting down so get out */
- if (retval == 0 || CtdlThreadCheckStop()) {
- return NULL;
- }
- /** Select says something happened on one of our master sockets so now we handle it */
- for (serviceptr = ServiceHookTable; serviceptr != NULL;
- serviceptr = serviceptr->next) {
- if (FD_ISSET(serviceptr->msock, &readfds)) {
- ssock = accept(serviceptr->msock, NULL, 0);
- if (ssock >= 0) {
- CtdlLogPrintf(CTDL_DEBUG,
- "New client socket %d\n",
- ssock);
- /* The master socket is non-blocking but the client
- * sockets need to be blocking, otherwise certain
- * operations barf on FreeBSD. Not a fatal error.
- */
- if (fcntl(ssock, F_SETFL, 0) < 0) {
- CtdlLogPrintf(CTDL_EMERG,
- "citserver: Can't set socket to blocking: %s\n",
- strerror
- (errno));
- }
- /* New context will be created already
- * set up in the CON_EXECUTING state.
- */
- con = CreateNewContext();
- /* Assign our new socket number to it. */
- con->client_socket = ssock;
- con->h_command_function =
- serviceptr->h_command_function;
- con->h_async_function =
- serviceptr->h_async_function;
- con->ServiceName =
- serviceptr->ServiceName;
- con->h_greeting_function = serviceptr->h_greeting_function;
- /* Determine whether it's a local socket */
- if (serviceptr->sockpath != NULL)
- con->is_local_socket = 1;
-
- /* Set the SO_REUSEADDR socket option */
- i = 1;
- setsockopt(ssock, SOL_SOCKET,
- SO_REUSEADDR, &i,
- sizeof(i));
-
- /** Now we can pass this context to an idle worker thread to get things going
- * What if there are no idle workers?
- * We could create one but what if the thread list is full?
- * Then I guess we need to close the socket a reject the connection.
- */
- /** TODO: If there are no idle threads then this server is overloaded and we should reject the connection
- * This will have the effect of throttling the incomming connections on master sockets
- * a little and slow the process down.
- */
-// if (idle_workers)
- {
- con->state = CON_START;
- citthread_kill(client_select_thread->tid, SIGUSR1);
- citthread_cond_signal(&worker_block);
- }
- // else
- // output try later message
- //start_context(con);
- }
- }
- }
+ if (statcount) {
+ gettimeofday(&now, NULL);
+ timersub(&now, &start, &result);
+ last_duration = (double)result.tv_sec + ((double)result.tv_usec / (double) 1000000);
+ CtdlLogPrintf(CTDL_EMERG, "Simulated %ld connections in %f seconds\n", stats_done, last_duration);
}
- return NULL;
}
-/*
- * Select on client socket.
- * Only one dedicated thread in here.
- * We have to interrupt our select whenever a context is returned to the CON_READY state.
- * as a result each context may be close to timing out its client so we have to calculate
- * which client socket will timeout first and expire our select on that time.
- *
- */
-void *select_on_client(void *arg)
-{
- fd_set readfds;
- struct timeval tv, now, result;
- int retval = 0;
- int highest;
- struct CitContext *ptr;
-
- CtdlThreadName("select_on_client");
-
- while (!CtdlThreadCheckStop()) {
- /* Initialise the fdset */
- FD_ZERO(&readfds);
- highest = 0;
- /** Get the clients to select on */
- tv.tv_sec = config.c_sleeping;
- tv.tv_usec = 0;
- begin_critical_section(S_SESSION_TABLE);
- for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
- if (ptr->state == CON_IDLE) {
- gettimeofday(&now, NULL);
- timersub(&(ptr->client_expires_at),
- &now, &result);
- if (result.tv_sec <= 0) {
- /** This client has timed out so kill it */
- ptr->kill_me = 1;
- continue;
- }
- /** Is this one going to expire first? */
- timersub(&result, &tv, &now);
- if (now.tv_sec <= 0 && now.tv_usec <= 0) {
- tv.tv_sec = result.tv_sec;
- tv.tv_usec = result.tv_usec;
- }
- FD_SET(ptr->client_socket, &readfds);
- if (ptr->client_socket > highest)
- highest = ptr->client_socket;
- }
- }
- end_critical_section(S_SESSION_TABLE);
-
- /* Now we can select on any connections that are waiting */
- if (!CtdlThreadCheckStop()) {
- retval =
- CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
- } else { /* Shutting down? */
- return NULL;
- }
-
-
- /* Now figure out who made this select() unblock.
- * First, check for an error or exit condition.
- */
- if (retval < 0) {
- if (errno == EBADF) {
- CtdlLogPrintf(CTDL_NOTICE,
- "select() failed: (%s)\n",
- strerror(errno));
- }
- if (errno != EINTR) {
- CtdlLogPrintf(CTDL_EMERG,
- "Exiting (%s)\n",
- strerror(errno));
- CtdlThreadStopAll();
- } else if (!CtdlThreadCheckStop()) {
- CtdlLogPrintf(CTDL_DEBUG,
- "Un handled select failure.\n");
- }
- } else if (retval > 0) {
- begin_critical_section(S_SESSION_TABLE);
- for (ptr = ContextList; ptr != NULL;
- ptr = ptr->next) {
- if ((FD_ISSET
- (ptr->client_socket, &readfds))
- && (ptr->state == CON_IDLE)) {
- ptr->input_waiting = 1;
- ptr->state = CON_READY;
- /** reset client expire time */
- ptr->client_expires_at.tv_sec = config.c_sleeping;
- ptr->client_expires_at.tv_usec = 0;
- }
- }
- end_critical_section(S_SESSION_TABLE);
- }
- }
- return NULL;
-}
-
-
-
-/*
- * Do the worker threads work when needed
- */
-int execute_session(struct CitContext *bind_me)
-{
- int force_purge;
-
- become_session(bind_me);
-
- /* If the client has sent a command, execute it. */
- if (CC->input_waiting) {
- CC->h_command_function();
- CC->input_waiting = 0;
- }
-
- /* If there are asynchronous messages waiting and the
- * client supports it, do those now */
- if ((CC->is_async) && (CC->async_waiting)
- && (CC->h_async_function != NULL)) {
- CC->h_async_function();
- CC->async_waiting = 0;
- }
-
- force_purge = CC->kill_me;
- if (force_purge)
- CT->Context = NULL;
- become_session(NULL);
- bind_me->state = CON_IDLE;
- return force_purge;
-}
-
-
-
-extern void dead_session_purge(int force);
-
-/*
- * A new worker_thread loop.
- */
-
-void *new_worker_thread(void *arg)
-{
- struct CitContext *bind_me, *ptr;
- int force_purge;
-
- while (!CtdlThreadCheckStop()) {
-
- /* make doubly sure we're not holding any stale db handles
- * which might cause a deadlock.
- */
- cdb_check_handles();
- force_purge = 0;
- bind_me = NULL; /* Which session shall we handle? */
-
- begin_critical_section(S_SESSION_TABLE);
- for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
- if (ptr->state == CON_START) {
- ptr->state = CON_EXECUTING;
- end_critical_section(S_SESSION_TABLE);
- become_session(ptr);
- begin_session(ptr);
- ptr->h_greeting_function();
- become_session(NULL);
- ptr->state = CON_IDLE;
- break;
- }
- if (ptr->state == CON_READY) {
- ptr->state = CON_EXECUTING;
- end_critical_section(S_SESSION_TABLE);
- force_purge = execute_session(ptr);
- break;
- }
-
- }
- end_critical_section(S_SESSION_TABLE);
-
- dead_session_purge(force_purge);
-
- /** block the worker threads waiting for a select to do something */
- idle_workers++;
- ctdl_thread_internal_change_state(CT, CTDL_THREAD_BLOCKED);
- citthread_mutex_lock(&worker_block_mutex);
- citthread_cond_wait(&worker_block, &worker_block_mutex);
- citthread_mutex_unlock(&worker_block_mutex);
- ctdl_thread_internal_change_state(CT, CTDL_THREAD_RUNNING);
- idle_workers--;
-
- if (CtdlThreadCheckStop())
- break;
-
- }
- return NULL;
-}
projects / citadel.git / blobdiff