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/*
* File: cancel3.c
*
* Test Synopsis: Test asynchronous cancelation.
*
* Test Method (Validation or Falsification):
* -
*
* Requirements Tested:
* -
*
* Features Tested:
* -
*
* Cases Tested:
* -
*
* Description:
* -
*
* Environment:
* -
*
* Input:
* - None.
*
* Output:
* - File name, Line number, and failed expression on failure.
* - No output on success.
*
* Assumptions:
* - have working pthread_create, pthread_self, pthread_mutex_lock/unlock
* pthread_testcancel, pthread_cancel, pthread_join
*
* Pass Criteria:
* - Process returns zero exit status.
*
* Fail Criteria:
* - Process returns non-zero exit status.
*/
#include "test.h"
/*
* Create NUMTHREADS threads in addition to the Main thread.
*/
enum {
NUMTHREADS = 10
};
typedef struct bag_t_ bag_t;
struct bag_t_ {
int threadnum;
int started;
/* Add more per-thread state variables here */
int count;
};
static bag_t threadbag[NUMTHREADS + 1];
void *
mythread(void * arg)
{
void* result = (void*)((int)(size_t)PTHREAD_CANCELED + 1);
bag_t * bag = (bag_t *) arg;
assert(bag == &threadbag[bag->threadnum]);
assert(bag->started == 0);
bag->started = 1;
/* Set to known state and type */
assert(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) == 0);
assert(pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL) == 0);
/*
* We wait up to 30 seconds for a cancelation to be applied to us.
*/
for (bag->count = 0; bag->count < 30; bag->count++)
{
/* Busy wait to avoid Sleep(), since we can't asynchronous cancel inside a
kernel function. (This is still somewhat fragile as if the async cancel
can fail if it happens to occur while we're inside the kernel function
that time() calls...) */
time_t start = time(NULL);
while ((time(NULL) - start) < 1)
{
int i;
for (i = 0; i < 1E7; i++)
__asm__ volatile ("pause":::);
}
}
/* Notice if asynchronous cancel got deferred */
pthread_testcancel();
return result;
}
int
main()
{
int failed = 0;
int i;
pthread_t t[NUMTHREADS + 1];
int ran_to_completion = 0;
assert((t[0] = pthread_self()) != NULL);
for (i = 1; i <= NUMTHREADS; i++)
{
threadbag[i].started = 0;
threadbag[i].threadnum = i;
assert(pthread_create(&t[i], NULL, mythread, (void *) &threadbag[i]) == 0);
}
/*
* Code to control or munipulate child threads should probably go here.
*/
Sleep(500);
for (i = 1; i <= NUMTHREADS; i++)
{
assert(pthread_cancel(t[i]) == 0);
}
/*
* Give threads time to run.
*/
Sleep(NUMTHREADS * 100);
/*
* Standard check that all threads started.
*/
for (i = 1; i <= NUMTHREADS; i++)
{
if (!threadbag[i].started)
{
failed |= !threadbag[i].started;
fprintf(stderr, "Thread %d: started %d\n", i, threadbag[i].started);
}
}
assert(!failed);
/*
* Check any results here. Set "failed" and only print output on failure.
*/
failed = 0;
for (i = 1; i <= NUMTHREADS; i++)
{
int fail = 0;
void *result = 0;
/*
* The thread does not contain any cancelation points, so
* a return value of PTHREAD_CANCELED confirms that async
* cancelation succeeded.
*/
assert(pthread_join(t[i], &result) == 0);
fail = (result != PTHREAD_CANCELED);
if (fail)
{
fprintf(stderr, "Thread %d: started %d: count %d: result %d \n",
i,
threadbag[i].started,
threadbag[i].count,
result);
}
if (threadbag[i].count >= 30)
ran_to_completion++;
failed = (failed || fail);
}
if (ran_to_completion >= 10)
{
fprintf(stderr, "All threads ran to completion, async cancellation never happened\n");
failed = 1;
}
assert(!failed);
/*
* Success.
*/
return 0;
}
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