mailing list of musl libc

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 #include "pthread_impl.h"
#include <threads.h>

int __munmap(void *, size_t);

int thrd_detach(thrd_t t)
{
	/* Cannot detach a thread that's already exiting */
	if (a_swap(t->exitlock, 1)){
		int tmp;
		while ((tmp = t->tid)) __timedwait(&t->tid, tmp, 0, 0, 0, 0, 0);
		if (t->map_base) __munmap(t->map_base, t->map_size);
	} else {
		t->detached = 2;
		__unlock(t->exitlock);
	}
	return thrd_success;
}