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Fix watch/timer event deletion
This commit is contained in:
parent
0a31be6ba2
commit
470317f5c7
@ -1,3 +1,10 @@
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Tue May 12 17:43:22 BST 2009 Daniel P. Berrange <berrange@redhat.com>
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Fix watch/timer event deletion
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* qemud/event.c: Change handling of deleted watches/timers
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to ensure correct dispatch of callbacks when deleted flag
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is set
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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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114
qemud/event.c
114
qemud/event.c
@ -313,7 +313,7 @@ static int virEventCalculateTimeout(int *timeout) {
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EVENT_DEBUG("Calculate expiry of %d timers", eventLoop.timeoutsCount);
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/* Figure out if we need a timeout */
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for (i = 0 ; i < eventLoop.timeoutsCount ; i++) {
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if (eventLoop.timeouts[i].deleted || eventLoop.timeouts[i].frequency < 0)
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if (eventLoop.timeouts[i].frequency < 0)
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continue;
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EVENT_DEBUG("Got a timeout scheduled for %llu", eventLoop.timeouts[i].expiresAt);
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@ -350,32 +350,26 @@ static int virEventCalculateTimeout(int *timeout) {
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* file handles. The caller must free the returned data struct
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* returns: the pollfd array, or NULL on error
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*/
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static int virEventMakePollFDs(struct pollfd **retfds) {
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static struct pollfd *virEventMakePollFDs(void) {
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struct pollfd *fds;
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int i, nfds = 0;
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int i;
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/* Setup the poll file handle data structs */
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if (VIR_ALLOC_N(fds, eventLoop.handlesCount) < 0)
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return NULL;
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for (i = 0 ; i < eventLoop.handlesCount ; i++) {
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if (eventLoop.handles[i].deleted)
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continue;
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nfds++;
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}
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*retfds = NULL;
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/* Setup the poll file handle data structs */
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if (VIR_ALLOC_N(fds, nfds) < 0)
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return -1;
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for (i = 0, nfds = 0 ; i < eventLoop.handlesCount ; i++) {
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if (eventLoop.handles[i].deleted)
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continue;
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fds[nfds].fd = eventLoop.handles[i].fd;
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fds[nfds].events = eventLoop.handles[i].events;
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fds[nfds].revents = 0;
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EVENT_DEBUG("Prepare n=%d w=%d, f=%d e=%d", i,
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eventLoop.handles[i].watch,
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eventLoop.handles[i].fd,
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eventLoop.handles[i].events);
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fds[i].fd = eventLoop.handles[i].fd;
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fds[i].events = eventLoop.handles[i].events;
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fds[i].revents = 0;
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//EVENT_DEBUG("Wait for %d %d", eventLoop.handles[i].fd, eventLoop.handles[i].events);
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nfds++;
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}
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*retfds = fds;
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return nfds;
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return fds;
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}
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@ -435,26 +429,30 @@ static int virEventDispatchTimeouts(void) {
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* Returns 0 upon success, -1 if an error occurred
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*/
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static int virEventDispatchHandles(int nfds, struct pollfd *fds) {
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int i, n;
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int i;
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for (i = 0, n = 0 ; i < eventLoop.handlesCount && n < nfds ; i++) {
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/* NB, use nfds not eventLoop.handlesCount, because new
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* fds might be added on end of list, and they're not
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* in the fds array we've got */
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for (i = 0 ; i < nfds ; i++) {
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if (eventLoop.handles[i].deleted) {
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EVENT_DEBUG("Skip deleted %d", eventLoop.handles[i].fd);
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EVENT_DEBUG("Skip deleted n=%d w=%d f=%d", i,
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eventLoop.handles[i].watch, eventLoop.handles[i].fd);
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continue;
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}
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if (fds[n].revents) {
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if (fds[i].revents) {
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virEventHandleCallback cb = eventLoop.handles[i].cb;
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void *opaque = eventLoop.handles[i].opaque;
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int hEvents = virPollEventToEventHandleType(fds[n].revents);
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EVENT_DEBUG("Dispatch %d %d %p", fds[n].fd,
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fds[n].revents, eventLoop.handles[i].opaque);
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int hEvents = virPollEventToEventHandleType(fds[i].revents);
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EVENT_DEBUG("Dispatch n=%d f=%d w=%d e=%d %p", i,
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fds[i].fd, eventLoop.handles[i].watch,
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fds[i].revents, eventLoop.handles[i].opaque);
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virEventUnlock();
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(cb)(eventLoop.handles[i].watch,
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fds[n].fd, hEvents, opaque);
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fds[i].fd, hEvents, opaque);
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virEventLock();
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}
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n++;
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}
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return 0;
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@ -545,22 +543,21 @@ static int virEventCleanupHandles(void) {
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* at least one file handle has an event, or a timer expires
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*/
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int virEventRunOnce(void) {
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struct pollfd *fds;
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struct pollfd *fds = NULL;
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int ret, timeout, nfds;
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virEventLock();
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eventLoop.running = 1;
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eventLoop.leader = pthread_self();
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if ((nfds = virEventMakePollFDs(&fds)) < 0) {
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virEventUnlock();
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return -1;
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}
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if (virEventCalculateTimeout(&timeout) < 0) {
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VIR_FREE(fds);
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virEventUnlock();
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return -1;
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}
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if (virEventCleanupTimeouts() < 0 ||
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virEventCleanupHandles() < 0)
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goto error;
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if (!(fds = virEventMakePollFDs()) ||
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virEventCalculateTimeout(&timeout) < 0)
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goto error;
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nfds = eventLoop.handlesCount;
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virEventUnlock();
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@ -572,38 +569,31 @@ int virEventRunOnce(void) {
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if (errno == EINTR) {
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goto retry;
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}
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VIR_FREE(fds);
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return -1;
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goto error_unlocked;
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}
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virEventLock();
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if (virEventDispatchTimeouts() < 0) {
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VIR_FREE(fds);
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virEventUnlock();
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return -1;
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}
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if (virEventDispatchTimeouts() < 0)
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goto error;
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if (ret > 0 &&
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virEventDispatchHandles(nfds, fds) < 0) {
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VIR_FREE(fds);
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virEventUnlock();
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return -1;
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}
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VIR_FREE(fds);
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virEventDispatchHandles(nfds, fds) < 0)
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goto error;
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if (virEventCleanupTimeouts() < 0) {
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virEventUnlock();
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return -1;
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}
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if (virEventCleanupHandles() < 0) {
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virEventUnlock();
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return -1;
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}
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if (virEventCleanupTimeouts() < 0 ||
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virEventCleanupHandles() < 0)
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goto error;
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eventLoop.running = 0;
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virEventUnlock();
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VIR_FREE(fds);
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return 0;
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error:
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virEventUnlock();
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error_unlocked:
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VIR_FREE(fds);
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return -1;
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}
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static void virEventHandleWakeup(int watch ATTRIBUTE_UNUSED,
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