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/*
* count1.c
*
* Written by Ben Elliston <bje@cygnus.com>.
*
* Description:
* Test some basic assertions about the number of threads at runtime.
*/
#include <windows.h>
#include <pthread.h>
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_t threads[10];
static unsigned numThreads = 1;
void *
myfunc(void *arg)
{
pthread_mutex_lock(&lock);
numThreads++;
pthread_mutex_unlock(&lock);
Sleep(1000);
return 0;
}
int
main()
{
int i, result;
int maxThreads = sizeof(threads) / sizeof(pthread_t);
/* Spawn ten threads. Each thread should increment the numThreads
variable, sleep for one second, decrement the variable and then
exit. The final result of numThreads should be 1 again. */
for (i = 0; i < maxThreads; i++)
{
result = pthread_create(&threads[i], NULL, myfunc, 0);
if (result != 0)
{
return 1;
}
}
/* Wait for all the threads to exit. */
for (i = 0; i < maxThreads; i++)
{
pthread_join(threads[i], NULL);
pthread_mutex_lock(&lock);
numThreads--;
pthread_mutex_unlock(&lock);
}
/* Check the number of live threads. */
if (numThreads != 1)
{
return 1;
}
/* Success. */
return 0;
}
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