On 21/03/2015 12:39, Victor Bombi wrote:
> May be it has some relation with?
>
> http://sourceforge.net/p/mingw-w64/mailman/message/31749147/
I don't think it's related; this has to do with explicit calls to
thread_exit() not invoking cleanup handlers that were registered via
pthread_cleanup_push().
Looking at the definition for pthread_cleanup_push() in
winpthreads/include/pthread.h, it looks like the cleanup stack is only
accessible via a local variable, and no mechanism exists to call these
handlers unless pthread_cleanup_pop() is explicitly called.
pthreads-win32 uses __try/__finally (for SEH) or
pthread_setspecific()/pthread_getspecific() (for C cleanup) to ensure
they're always called.
> ----- Original Message -----
> From: "Keri Harris" <k...@gentoo.org>
> To: <mingw-w64-public@lists.sourceforge.net>
> Sent: Thursday, March 19, 2015 3:27 PM
> Subject: [Mingw-w64-public] winpthreads cleanup handlers not called
> afterpthread_exit()
>
>
>> I've noticed some unexpected behaviour with winpthreads which I believe
>> is a bug. Thread-cancellation cleanup handlers are not called when a
>> thread terminates due to a call to pthread_exit(). This is unexpected;
>> the pthread_cleanup_push(), pthread_cleanup_pop() specification [1]
>> mentions:
>>
>> The cancellation cleanup handler shall be popped from the
>> cancellation cleanup stack
>> and invoked with the argument arg when:
>>
>> The thread exits (that is, calls pthread_exit()).
>>
>> An example program illustrating winpthreads failing to invoke cleanup
>> handlers follows:
>>
>>
>> #include <pthread.h>
>> #include <stdio.h>
>>
>> void* cleanup_func(void *arg)
>> {
>> printf("cleanup_func()\n");
>> }
>>
>> void* func(void *arg)
>> {
>> printf("func()\n");
>> pthread_cleanup_push(cleanup_func, 0);
>> pthread_exit(NULL);
>> pthread_cleanup_pop(1);
>> }
>>
>> int main()
>> {
>> pthread_t t;
>> void *ret;
>>
>> pthread_create(&t, NULL, func, (void*)NULL);
>> pthread_join(t, &ret);
>>
>> return 0;
>> }
>>
>>
>>
>> Thanks
>>
>> Keri
>>
>> [1]
>> http://pubs.opengroup.org/onlinepubs/000095399/functions/pthread_cleanup_pop.html
>>
>>
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