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|
/*
* once3.c
*
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* --------------------------------------------------------------------------
*
* Create several pthread_once objects and channel several threads
* through each. Make the init_routine cancelable and cancel them with
* waiters waiting.
*
* Depends on API functions:
* pthread_once()
* pthread_create()
* pthread_testcancel()
* pthread_cancel()
* pthread_once()
*/
/* #define ASSERT_TRACE */
#include "test.h"
#define NUM_THREADS 100 /* Targeting each once control */
#define NUM_ONCE 10
pthread_once_t o = PTHREAD_ONCE_INIT;
pthread_once_t once[NUM_ONCE];
typedef struct {
int i;
CRITICAL_SECTION cs;
} sharedInt_t;
static sharedInt_t numOnce = {0, {0}};
static sharedInt_t numThreads = {0, {0}};
void
myfunc(void)
{
EnterCriticalSection(&numOnce.cs);
numOnce.i++;
assert(numOnce.i > 0);
LeaveCriticalSection(&numOnce.cs);
/* Simulate slow once routine so that following threads pile up behind it */
Sleep(10);
/* test for cancelation late so we're sure to have waiters. */
pthread_testcancel();
}
void *
mythread(void * arg)
{
/*
* Cancel every thread. These threads are deferred cancelable only, so
* only the thread performing the once routine (my_func) will see it (there are
* no other cancelation points here). The result will be that every thread
* eventually cancels only when it becomes the new once thread.
*/
assert(pthread_cancel(pthread_self()) == 0);
assert(pthread_once(&once[(int) arg], myfunc) == 0);
EnterCriticalSection(&numThreads.cs);
numThreads.i++;
LeaveCriticalSection(&numThreads.cs);
return 0;
}
int
main()
{
pthread_t t[NUM_THREADS][NUM_ONCE];
int i, j;
InitializeCriticalSection(&numThreads.cs);
InitializeCriticalSection(&numOnce.cs);
for (j = 0; j < NUM_ONCE; j++)
{
once[j] = o;
for (i = 0; i < NUM_THREADS; i++)
{
assert(pthread_create(&t[i][j], NULL, mythread, (void *) j) == 0);
}
}
for (j = 0; j < NUM_ONCE; j++)
for (i = 0; i < NUM_THREADS; i++)
if (pthread_join(t[i][j], NULL) != 0)
printf("Join failed for [thread,once] = [%d,%d]\n", i, j);
/*
* All threads will cancel, none will return normally from
* pthread_once and so numThreads should never be incremented. However,
* numOnce should be incremented by every thread (NUM_THREADS*NUM_ONCE).
*/
assert(numOnce.i == NUM_ONCE * NUM_THREADS);
assert(numThreads.i == 0);
DeleteCriticalSection(&numOnce.cs);
DeleteCriticalSection(&numThreads.cs);
return 0;
}
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