/*
* This file contains housekeeping tasks which periodically
- * need to be executed.
+ * need to be executed. It keeps a nice little queue...
*
+ * $Id$
*/
+#include "sysdep.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
+#include <fcntl.h>
#include <time.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
-#include <pthread.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+#include "tools.h"
#include "citadel.h"
#include "server.h"
-#include "proto.h"
+#include "citserver.h"
+#include "config.h"
+#include "housekeeping.h"
+#include "sysdep_decls.h"
+#include "room_ops.h"
+
+
+int housepipe[2]; /* This is the queue for housekeeping tasks */
+
/*
* Terminate idle sessions. This function pounds through the session table
void terminate_idle_sessions(void) {
struct CitContext *ccptr;
time_t now;
-
- time(&now);
- for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
- if ( (ccptr!=CC)
- && (config.c_sleeping > 0)
- && (now - (ccptr->lastcmd) > config.c_sleeping) ) {
- lprintf(3, "Session %d timed out\n", ccptr->cs_pid);
- kill_session(ccptr->cs_pid);
- ccptr = ContextList;
+ int session_to_kill;
+
+ do {
+ now = time(NULL);
+ session_to_kill = 0;
+ begin_critical_section(S_SESSION_TABLE);
+ for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
+ if ( (ccptr!=CC)
+ && (config.c_sleeping > 0)
+ && (now - (ccptr->lastcmd) > config.c_sleeping) ) {
+ session_to_kill = ccptr->cs_pid;
+ }
}
- }
+ end_critical_section(S_SESSION_TABLE);
+ if (session_to_kill > 0) {
+ lprintf(3, "Session %d timed out. Terminating it...\n",
+ session_to_kill);
+ kill_session(session_to_kill);
+ }
+ } while(session_to_kill > 0);
}
-/*
- * Main housekeeping function. This gets run whenever a session terminates.
- */
-void do_housekeeping() {
- begin_critical_section(S_HOUSEKEEPING);
- /*
- * Terminate idle sessions.
- */
- lprintf(7, "Calling terminate_idle_sessions()\n");
- terminate_idle_sessions();
-
- /*
- * If the server is scheduled to shut down the next time all
- * users are logged out, now's the time to do it.
- */
+void check_sched_shutdown(void) {
if ((ScheduledShutdown == 1) && (ContextList == NULL)) {
lprintf(3, "Scheduled shutdown initiating.\n");
master_cleanup();
- }
- end_critical_section(S_HOUSEKEEPING);
}
+}
+
+
+
+/*
+ * This is the main loop for the housekeeping thread. It remains active
+ * during the entire run of the server.
+ */
+void housekeeping_loop(void) {
+ long flags;
+ struct timeval tv;
+ fd_set readfds;
+ int did_something;
+ char house_cmd[256]; /* Housekeep cmds are always 256 bytes long */
+ char cmd[256];
+
+ if (pipe(housepipe) != 0) {
+ lprintf(1, "FATAL ERROR: can't create housekeeping pipe: %s\n",
+ strerror(errno));
+ exit(0);
+ }
+
+ flags = (long) fcntl(housepipe[1], F_GETFL);
+ flags |= O_NONBLOCK;
+ fcntl(housepipe[1], F_SETFL, flags);
+
+ while(1) {
+ do {
+ did_something = 0;
+ tv.tv_sec = HOUSEKEEPING_WAKEUP;
+ tv.tv_usec = 0;
+ FD_ZERO(&readfds);
+ FD_SET(housepipe[0], &readfds);
+ select(housepipe[0] + 1, &readfds, 0L, 0L, &tv);
+ if (FD_ISSET(housepipe[0], &readfds)) {
+ did_something = 1;
+ }
+
+ if (did_something) {
+ read(housepipe[0], house_cmd, 256);
+ }
+ else {
+ memset(house_cmd, 0, 256);
+ strcpy(house_cmd, "MINUTE");
+ }
+
+ extract(cmd, house_cmd, 0);
+
+ /* Do whatever this cmd requires */
+
+ /* Once-every-minute housekeeper */
+ if (!strcmp(cmd, "MINUTE")) {
+ terminate_idle_sessions();
+ }
+
+ /* Scheduled shutdown housekeeper */
+ else if (!strcmp(cmd, "SCHED_SHUTDOWN")) {
+ check_sched_shutdown();
+ }
+
+ /* Unknown */
+ else {
+ lprintf(7, "Unknown housekeeping command\n");
+ }
+
+ } while (did_something);
+ }
+}
+
+
+
+
+void enter_housekeeping_cmd(char *cmd) {
+ char cmdbuf[256];
+
+ lprintf(9, "enter_housekeeping_cmd(%s)\n", cmd);
+ safestrncpy(cmdbuf, cmd, 256);
+ begin_critical_section(S_HOUSEKEEPING);
+ write(housepipe[1], cmdbuf, 256);
+ end_critical_section(S_HOUSEKEEPING);
+ lprintf(9, "leaving enter_housekeeping_cmd()\n");
+}
+
+
/*
* Check (and fix) floor reference counts. This doesn't need to be done
* very often, since the counts should remain correct during normal operation.
+ * NOTE: this function pair should ONLY be called during startup. It is NOT
+ * thread safe.
*/
-void check_ref_counts() {
- int ref[MAXFLOORS];
- struct quickroom qrbuf;
+void check_ref_counts_backend(struct quickroom *qrbuf) {
struct floor flbuf;
- int a;
- for (a=0; a<MAXFLOORS; ++a) ref[a] = 0;
-
- for (a=0; a<MAXROOMS; ++a) {
- getroom(&qrbuf, a);
- if (qrbuf.QRflags & QR_INUSE) {
- ++ref[(int)qrbuf.QRfloor];
- }
- }
+ getfloor(&flbuf, qrbuf->QRfloor);
+ ++flbuf.f_ref_count;
+ flbuf.f_flags = flbuf.f_flags | QR_INUSE;
+ putfloor(&flbuf, qrbuf->QRfloor);
+ }
+
+void check_ref_counts(void) {
+ struct floor flbuf;
+ int a;
for (a=0; a<MAXFLOORS; ++a) {
- lgetfloor(&flbuf, a);
- flbuf.f_ref_count = ref[a];
- if (ref[a] > 0) flbuf.f_flags = flbuf.f_flags | QR_INUSE ;
- lputfloor(&flbuf, a);
+ getfloor(&flbuf, a);
+ flbuf.f_ref_count = 0;
+ flbuf.f_flags = flbuf.f_flags & ~QR_INUSE;
+ putfloor(&flbuf, a);
}
+
+ ForEachRoom(check_ref_counts_backend);
}
projects / citadel.git / blobdiff