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windows: Prevent queueing of multiple thread cancel APCs

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This avoids any races during cleanup invocation if multiple cancel() requests
come in.
This commit is contained in:
Martin Willi
2014-06-04 15:53:01 +02:00
parent 0fa9c95811
commit 9dec601f30
1 changed files with 13 additions and 4 deletions
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src/libstrongswan/threading/windows/thread.c
+13 -4
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@@ -88,10 +88,15 @@ struct private_thread_t {
bool cancelability;
/**
* Has the thread been cancelled
* Has the thread been cancelled by thread->cancel()?
*/
bool canceled;
/**
* Did we schedule an APC to docancel()?
*/
bool cancel_pending;
/**
* Active condition variable thread is waiting in, if any
*/
@@ -357,10 +362,14 @@ METHOD(thread_t, cancel, void,
if (this->cancelability)
{
threads_lock->lock(threads_lock);
QueueUserAPC((void*)docancel, this->handle, (uintptr_t)this);
if (this->condvar)
if (!this->cancel_pending)
{
WakeAllConditionVariable(this->condvar);
this->cancel_pending = TRUE;
QueueUserAPC((void*)docancel, this->handle, (uintptr_t)this);
if (this->condvar)
{
WakeAllConditionVariable(this->condvar);
}
}
threads_lock->unlock(threads_lock);
}