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#include <semaphore.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
//from internaltypes.h
struct new_sem
{
unsigned int value;
int private;
unsigned long int nwaiters;
};
#ifndef SEM_WAIT
# define SEM_WAIT(s) sem_wait (s)
#endif
static void *
tf (void *arg)
{
#ifdef PREPARE
PREPARE
#endif
SEM_WAIT (arg);
return NULL;
}
int
main (void)
{
int tries = 5;
pthread_t th;
union
{
sem_t s;
struct new_sem ns;
} u;
again:
if (sem_init (&u.s, 0, 0) != 0)
{
puts ("sem_init failed");
return 1;
}
#if __HAVE_64B_ATOMICS
if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
#else
if (u.ns.nwaiters != 0)
#endif
{
puts ("nwaiters not initialized");
return 1;
}
if (pthread_create (&th, NULL, tf, &u.s) != 0)
{
puts ("pthread_create failed");
return 1;
}
sleep (1);
if (pthread_cancel (th) != 0)
{
puts ("pthread_cancel failed");
return 1;
}
void *r;
if (pthread_join (th, &r) != 0)
{
puts ("pthread_join failed");
return 1;
}
if (r != PTHREAD_CANCELED && --tries > 0)
{
/* Maybe we get the scheduling right the next time. */
sem_destroy (&u.s);
goto again;
}
#if __HAVE_64B_ATOMICS
if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
#else
if (u.ns.nwaiters != 0)
#endif
{
puts ("nwaiters not reset");
return 1;
}
return 0;
}
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