On Sat, 20 Jan 2024 10:13:22 +0100
ASSI wrote:
> Takashi Yano via Cygwin writes:
> > I might find the culprit in gcc's libstdc++ code such as:
> > libstdc++-v3/include/ext/concurrentce.h:
> > class __mutex
> > {
> > private:
> > #if __GTHREADS && defined __GTHREAD_MUTEX_INIT
> > __gthread_mutex_t _M_mutex = __GTHREAD_MUTEX_INIT;
> > #else
> > __gthread_mutex_t _M_mutex;
> > #endif
> >
> > __GTHREAD_MUTEX_INIT here is PTHREAD_MUTEX_INITIALIZER and
> > __gthread_mutex_t is pthread_mutex_t.
> >
> > I think this code vaiolates the POSIX statement.
>
> So what happens if you undefine __GTHREAD_MUTEX_INIT?
I have tried. The test case:
#include <mutex>
int main()
{
for (;;) {
std::mutex *m = new std::mutex;
m->lock();
m->unlock();
delete m;
}
return 0;
}
gets working fine. However, this test case:
#include <future>
int func() { return 0; }
int main()
{
for (;;) {
std::future<int> f = std::async(std::launch::async, func);
f.get();
}
return 0;
}
still has the problem.
pthread_mutex_t might be initialized also at another place...
--
Takashi Yano <[email protected]>
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