[Bug libstdc++/57440] Memory usage with future and std containers

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57440

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
If my guess is right you should be able to reproduce the unbounded memory usage
with this:

#include <future>

int f() { return 0; }

int main()
{
    for (int i=0; i < 100000; ++i)
        std::async(f).get();
}


And you should not see it happen with this:

#define _GTHREAD_USE_MUTEX_INIT_FUNC
#define _GTHREAD_USE_COND_INIT_FUNC

#include <future>

int f() { return 0; }

int main()
{
    for (int i=0; i < 100000; ++i)
        std::async(f).get();
}

Please check and update the bug report, thanks.