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/*
* File: condvar8.c
*
* Test Synopsis:
* - Test multiple pthread_cond_broadcasts.
*
* Test Method (Validation or Falsification):
* - Validation
*
* Requirements Tested:
* -
*
* Features Tested:
* -
*
* Cases Tested:
* -
*
* Description:
* - Make NUMTHREADS threads wait on CV, broadcast signal them, and then repeat.
*
* Environment:
* -
*
* Input:
* - None.
*
* Output:
* - File name, Line number, and failed expression on failure.
* - No output on success.
*
* Assumptions:
* -
*
* Pass Criteria:
* - Process returns zero exit status.
*
* Fail Criteria:
* - Process returns non-zero exit status.
*/
#include "test.h"
#include <sys/timeb.h>
/*
* Create NUMTHREADS threads in addition to the Main thread.
*/
enum {
NUMTHREADS = 5
};
typedef struct bag_t_ bag_t;
struct bag_t_ {
int threadnum;
int started;
/* Add more per-thread state variables here */
};
static bag_t threadbag[NUMTHREADS + 1];
typedef struct cvthing_t_ cvthing_t;
struct cvthing_t_ {
pthread_cond_t notbusy;
pthread_mutex_t lock;
int shared;
};
static cvthing_t cvthing = {
PTHREAD_COND_INITIALIZER,
PTHREAD_MUTEX_INITIALIZER,
0
};
static pthread_mutex_t start_flag = PTHREAD_MUTEX_INITIALIZER;
static struct timespec abstime = { 0, 0 };
static int awoken;
static void *
mythread(void * arg)
{
bag_t * bag = (bag_t *) arg;
assert(bag == &threadbag[bag->threadnum]);
assert(bag->started == 0);
bag->started = 1;
/* Wait for the start gun */
assert(pthread_mutex_lock(&start_flag) == 0);
assert(pthread_mutex_unlock(&start_flag) == 0);
assert(pthread_mutex_lock(&cvthing.lock) == 0);
pthread_cleanup_push(pthread_mutex_unlock, (void *) &cvthing.lock);
while (! (cvthing.shared > 0))
assert(pthread_cond_timedwait(&cvthing.notbusy, &cvthing.lock, &abstime) == 0);
pthread_cleanup_pop(0);
assert(cvthing.shared > 0);
awoken++;
assert(pthread_mutex_unlock(&cvthing.lock) == 0);
return (void *) 0;
}
int
main()
{
int failed = 0;
int i;
int first, last;
pthread_t t[NUMTHREADS + 1];
struct _timeb currSysTime;
const DWORD NANOSEC_PER_MILLISEC = 1000000;
assert((t[0] = pthread_self()) != NULL);
assert(cvthing.notbusy == PTHREAD_COND_INITIALIZER);
assert(cvthing.lock == PTHREAD_MUTEX_INITIALIZER);
_ftime(&currSysTime);
abstime.tv_sec = currSysTime.time;
abstime.tv_nsec = NANOSEC_PER_MILLISEC * currSysTime.millitm;
abstime.tv_sec += 10;
assert((t[0] = pthread_self()) != NULL);
awoken = 0;
for (first = 1, last = NUMTHREADS / 2;
first < NUMTHREADS;
first = last + 1, last = NUMTHREADS)
{
assert(pthread_mutex_lock(&start_flag) == 0);
for (i = first; i <= last; i++)
{
threadbag[i].started = 0;
threadbag[i].threadnum = i;
assert(pthread_create(&t[i], NULL, mythread, (void *) &threadbag[i]) == 0);
assert(pthread_detach(t[i]) == 0);
}
/*
* Code to control or munipulate child threads should probably go here.
*/
cvthing.shared = 0;
assert(pthread_mutex_unlock(&start_flag) == 0);
/*
* Give threads time to start.
*/
Sleep(1000);
assert(pthread_mutex_lock(&cvthing.lock) == 0);
cvthing.shared++;
assert(pthread_mutex_unlock(&cvthing.lock) == 0);
assert(pthread_cond_broadcast(&cvthing.notbusy) == 0);
/*
* Give threads time to complete.
*/
Sleep(1000);
assert(awoken == (i - 1));
}
/*
* Standard check that all threads started.
*/
for (i = 1; i <= NUMTHREADS; i++)
{
failed = !threadbag[i].started;
if (failed)
{
fprintf(stderr, "Thread %d: started %d\n", i, threadbag[i].started);
}
}
/*
* Cleanup the CV.
*/
assert(pthread_mutex_destroy(&cvthing.lock) == 0);
assert(cvthing.lock == NULL);
assert(pthread_cond_destroy(&cvthing.notbusy) == 0);
assert(cvthing.notbusy == NULL);
assert(!failed);
/*
* Check any results here.
*/
assert(awoken == NUMTHREADS);
/*
* Success.
*/
return 0;
}
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