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Fix deadlock in remote driver domain events

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* src/remote_internal.c: Release driver lock when dispatching events
  to callbacks
This commit is contained in:
Daniel P. Berrange 2009-07-28 17:45:19 +01:00
parent abe3ee9cc5
commit 664085ab74
1 changed files with 59 additions and 13 deletions
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72
src/remote_internal.c
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@ -167,6 +167,8 @@ struct private_data {
virDomainEventQueuePtr domainEvents;
/* Timer for flushing domainEvents queue */
int eventFlushTimer;
/* Flag if we're in process of dispatching */
int domainEventDispatching;
/* Self-pipe to wakeup threads waiting in poll() */
int wakeupSendFD;
@ -6288,18 +6290,26 @@ static int remoteDomainEventDeregister (virConnectPtr conn,
remoteDriverLock(priv);
if (virDomainEventCallbackListRemove(conn, priv->callbackList,
callback) < 0) {
error (conn, VIR_ERR_RPC, _("removing cb fron list"));
goto done;
}
if ( priv->callbackList->count == 0 ) {
/* Tell the server when we are the last callback deregistering */
if (call (conn, priv, 0, REMOTE_PROC_DOMAIN_EVENTS_DEREGISTER,
(xdrproc_t) xdr_void, (char *) NULL,
(xdrproc_t) xdr_void, (char *) NULL) == -1)
if (priv->domainEventDispatching) {
if (virDomainEventCallbackListMarkDelete(conn, priv->callbackList,
callback) < 0) {
error (conn, VIR_ERR_RPC, _("marking cb for deletion"));
goto done;
}
} else {
if (virDomainEventCallbackListRemove(conn, priv->callbackList,
callback) < 0) {
error (conn, VIR_ERR_RPC, _("removing cb from list"));
goto done;
}
if ( priv->callbackList->count == 0 ) {
/* Tell the server when we are the last callback deregistering */
if (call (conn, priv, 0, REMOTE_PROC_DOMAIN_EVENTS_DEREGISTER,
(xdrproc_t) xdr_void, (char *) NULL,
(xdrproc_t) xdr_void, (char *) NULL) == -1)
goto done;
}
}
rv = 0;
@ -7309,18 +7319,54 @@ done:
remoteDriverUnlock(priv);
}
static void remoteDomainEventDispatchFunc(virConnectPtr conn,
virDomainEventPtr event,
virConnectDomainEventCallback cb,
void *cbopaque,
void *opaque)
{
struct private_data *priv = opaque;
/* Drop the lock whle dispatching, for sake of re-entrancy */
remoteDriverUnlock(priv);
virDomainEventDispatchDefaultFunc(conn, event, cb, cbopaque, NULL);
remoteDriverLock(priv);
}
void
remoteDomainEventQueueFlush(int timer ATTRIBUTE_UNUSED, void *opaque)
{
virConnectPtr conn = opaque;
struct private_data *priv = conn->privateData;
virDomainEventQueue tempQueue;
remoteDriverLock(priv);
virDomainEventQueueDispatch(priv->domainEvents, priv->callbackList,
virDomainEventDispatchDefaultFunc, NULL);
priv->domainEventDispatching = 1;
/* Copy the queue, so we're reentrant safe */
tempQueue.count = priv->domainEvents->count;
tempQueue.events = priv->domainEvents->events;
priv->domainEvents->count = 0;
priv->domainEvents->events = NULL;
virDomainEventQueueDispatch(&tempQueue, priv->callbackList,
remoteDomainEventDispatchFunc, priv);
virEventUpdateTimeout(priv->eventFlushTimer, -1);
/* Purge any deleted callbacks */
virDomainEventCallbackListPurgeMarked(priv->callbackList);
if ( priv->callbackList->count == 0 ) {
/* Tell the server when we are the last callback deregistering */
if (call (conn, priv, 0, REMOTE_PROC_DOMAIN_EVENTS_DEREGISTER,
(xdrproc_t) xdr_void, (char *) NULL,
(xdrproc_t) xdr_void, (char *) NULL) == -1)
VIR_WARN0("Failed to de-register events");
}
priv->domainEventDispatching = 0;
remoteDriverUnlock(priv);
}