mailing list of musl libc

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 #include "pthread_impl.h"
#include <sys/mman.h>
#include <threads.h>

/* C11 threads cannot be canceled, so there is no need for a
   cancelation function pointer, here. */
int thrd_join(thrd_t t, int *res)
{
	int tmp;
	while ((tmp = t->tid)) __timedwait(&t->tid, tmp, 0, 0, 0, 0, 0);
	if (res) *res = (int)(intptr_t)t->result;
	if (t->map_base) munmap(t->map_base, t->map_size);
	return thrd_success;
}