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/*
* once3.c
*
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2012 Pthreads-win32 contributors
*
* Homepage1: http://sourceware.org/pthreads-win32/
* Homepage2: http://sourceforge.net/projects/pthreads4w/
*
* 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
static pthread_once_t o = PTHREAD_ONCE_INIT;
static pthread_once_t once[NUM_ONCE];
typedef struct {
int i;
CRITICAL_SECTION cs;
} sharedInt_t;
static sharedInt_t numOnce;
static sharedInt_t numThreads;
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 cancellation late so we're sure to have waiters. */
pthread_testcancel();
}
void *
mythread(void * arg)
{
/*
* Cancel every thread. These threads are deferred cancelable only, so
* this thread will see it only when it performs the once routine (my_func).
* The result will be that every thread eventually cancels only when it
* becomes the new 'once' thread.
*/
assert(pthread_cancel(pthread_self()) == 0);
/*
* Now we block on the 'once' control.
*/
assert(pthread_once(&once[(int)(size_t)arg], myfunc) == 0);
/*
* We should never get to here.
*/
EnterCriticalSection(&numThreads.cs);
numThreads.i++;
LeaveCriticalSection(&numThreads.cs);
return (void*)(size_t)0;
}
int
main()
{
pthread_t t[NUM_THREADS][NUM_ONCE];
int i, j;
#if defined(PTW32_CONFIG_MSVC6) && defined(__CLEANUP_CXX)
puts("If this test fails or hangs, rebuild the library with /EHa instead of /EHs.");
puts("(This is a known issue with Microsoft VC++6.0.)");
fflush(stdout);
#endif
memset(&numOnce, 0, sizeof(sharedInt_t));
memset(&numThreads, 0, sizeof(sharedInt_t));
InitializeCriticalSection(&numThreads.cs);
InitializeCriticalSection(&numOnce.cs);
for (j = 0; j < NUM_ONCE; j++)
{
once[j] = o;
for (i = 0; i < NUM_THREADS; i++)
{
/* GCC build: create was failing with EAGAIN after 790 threads */
while (0 != pthread_create(&t[i][j], NULL, mythread, (void *)(size_t)j))
sched_yield();
}
}
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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