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/95399/functions/pthread_cleanup_pop.html
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