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Fix interrupting of main event thread & protect against accidental uniniitalized variables
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@ -1,3 +1,9 @@
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Tue May 12 17:42:22 BST 2009 Daniel P. Berrange <berrange@redhat.com>
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* qemud/event.c: Start watch/timer IDs from 1 to avoid problem
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with accidental uninitialized variables at 0. Fix interrupting
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of main thread when updating/deleting watches/timers.
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Tue May 12 16:38:22 BST 2009 Daniel P. Berrange <berrange@redhat.com>
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* qemud/qemud.c, qemud/qemud.h, qemud/event.c: Remove use
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@ -84,10 +84,10 @@ struct virEventLoop {
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static struct virEventLoop eventLoop;
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/* Unique ID for the next FD watch to be registered */
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static int nextWatch = 0;
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static int nextWatch = 1;
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/* Unique ID for the next timer to be registered */
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static int nextTimer = 0;
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static int nextTimer = 1;
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static void virEventLock(void)
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{
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@ -143,15 +143,22 @@ int virEventAddHandleImpl(int fd, int events,
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void virEventUpdateHandleImpl(int watch, int events) {
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int i;
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EVENT_DEBUG("Update handle w=%d e=%d", watch, events);
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if (watch <= 0) {
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VIR_WARN("Ignoring invalid update watch %d", watch);
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return;
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}
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virEventLock();
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for (i = 0 ; i < eventLoop.handlesCount ; i++) {
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if (eventLoop.handles[i].watch == watch) {
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eventLoop.handles[i].events =
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virEventHandleTypeToPollEvent(events);
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virEventInterruptLocked();
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break;
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}
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}
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virEventInterruptLocked();
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virEventUnlock();
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}
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@ -164,6 +171,12 @@ void virEventUpdateHandleImpl(int watch, int events) {
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int virEventRemoveHandleImpl(int watch) {
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int i;
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EVENT_DEBUG("Remove handle %d", watch);
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if (watch <= 0) {
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VIR_WARN("Ignoring invalid remove watch %d", watch);
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return -1;
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}
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virEventLock();
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for (i = 0 ; i < eventLoop.handlesCount ; i++) {
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if (eventLoop.handles[i].deleted)
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@ -172,11 +185,11 @@ int virEventRemoveHandleImpl(int watch) {
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if (eventLoop.handles[i].watch == watch) {
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EVENT_DEBUG("mark delete %d %d", i, eventLoop.handles[i].fd);
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eventLoop.handles[i].deleted = 1;
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virEventInterruptLocked();
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virEventUnlock();
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return 0;
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}
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}
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virEventInterruptLocked();
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virEventUnlock();
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return -1;
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}
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@ -232,6 +245,12 @@ void virEventUpdateTimeoutImpl(int timer, int frequency) {
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struct timeval tv;
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int i;
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EVENT_DEBUG("Updating timer %d timeout with %d ms freq", timer, frequency);
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if (timer <= 0) {
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VIR_WARN("Ignoring invalid update timer %d", timer);
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return;
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}
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if (gettimeofday(&tv, NULL) < 0) {
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return;
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}
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@ -244,10 +263,10 @@ void virEventUpdateTimeoutImpl(int timer, int frequency) {
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frequency >= 0 ? frequency +
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(((unsigned long long)tv.tv_sec)*1000) +
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(((unsigned long long)tv.tv_usec)/1000) : 0;
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virEventInterruptLocked();
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break;
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}
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}
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virEventInterruptLocked();
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virEventUnlock();
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}
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@ -260,6 +279,12 @@ void virEventUpdateTimeoutImpl(int timer, int frequency) {
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int virEventRemoveTimeoutImpl(int timer) {
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int i;
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EVENT_DEBUG("Remove timer %d", timer);
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if (timer <= 0) {
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VIR_WARN("Ignoring invalid remove timer %d", timer);
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return -1;
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}
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virEventLock();
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for (i = 0 ; i < eventLoop.timeoutsCount ; i++) {
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if (eventLoop.timeouts[i].deleted)
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@ -267,11 +292,11 @@ int virEventRemoveTimeoutImpl(int timer) {
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if (eventLoop.timeouts[i].timer == timer) {
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eventLoop.timeouts[i].deleted = 1;
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virEventInterruptLocked();
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virEventUnlock();
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return 0;
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}
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}
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virEventInterruptLocked();
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virEventUnlock();
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return -1;
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}
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@ -617,9 +642,12 @@ static int virEventInterruptLocked(void)
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char c = '\0';
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if (!eventLoop.running ||
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pthread_self() == eventLoop.leader)
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pthread_self() == eventLoop.leader) {
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VIR_DEBUG("Skip interrupt, %d %d", eventLoop.running, (int)eventLoop.leader);
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return 0;
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}
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VIR_DEBUG0("Interrupting");
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if (safewrite(eventLoop.wakeupfd[1], &c, sizeof(c)) != sizeof(c))
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return -1;
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return 0;
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