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135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/*
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* once3.c
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*
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* --------------------------------------------------------------------------
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*
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* Create several pthread_once objects and channel several threads
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* through each. Make the init_routine cancelable and cancel them with
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* waiters waiting.
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*
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* Depends on API functions:
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* pthread_once()
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* pthread_create()
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* pthread_testcancel()
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* pthread_cancel()
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* pthread_once()
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*/
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/* #define ASSERT_TRACE */
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#include "test.h"
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#define NUM_THREADS 100 /* Targeting each once control */
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#define NUM_ONCE 10
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static pthread_once_t o = PTHREAD_ONCE_INIT;
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static pthread_once_t once[NUM_ONCE];
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typedef struct {
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int i;
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CRITICAL_SECTION cs;
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} sharedInt_t;
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static sharedInt_t numOnce = {0, {0}};
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static sharedInt_t numThreads = {0, {0}};
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void
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myfunc(void)
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{
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EnterCriticalSection(&numOnce.cs);
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numOnce.i++;
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assert(numOnce.i > 0);
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LeaveCriticalSection(&numOnce.cs);
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/* Simulate slow once routine so that following threads pile up behind it */
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Sleep(10);
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/* test for cancelation late so we're sure to have waiters. */
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pthread_testcancel();
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}
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void *
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mythread(void * arg)
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{
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/*
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* Cancel every thread. These threads are deferred cancelable only, so
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* only the thread performing the once routine (my_func) will see it (there are
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* no other cancelation points here). The result will be that every thread
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* eventually cancels only when it becomes the new 'once' thread.
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*/
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assert(pthread_cancel(pthread_self()) == 0);
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assert(pthread_once(&once[(int)(size_t)arg], myfunc) == 0);
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EnterCriticalSection(&numThreads.cs);
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numThreads.i++;
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LeaveCriticalSection(&numThreads.cs);
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return (void*)(size_t)0;
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}
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int
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main()
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{
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pthread_t t[NUM_THREADS][NUM_ONCE];
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int i, j;
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InitializeCriticalSection(&numThreads.cs);
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InitializeCriticalSection(&numOnce.cs);
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for (j = 0; j < NUM_ONCE; j++)
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{
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once[j] = o;
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for (i = 0; i < NUM_THREADS; i++)
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{
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/* GCC build: create was failing with EAGAIN after 790 threads */
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while (0 != pthread_create(&t[i][j], NULL, mythread, (void *)(size_t)j))
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sched_yield();
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}
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}
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for (j = 0; j < NUM_ONCE; j++)
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for (i = 0; i < NUM_THREADS; i++)
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if (pthread_join(t[i][j], NULL) != 0)
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printf("Join failed for [thread,once] = [%d,%d]\n", i, j);
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/*
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* All threads will cancel, none will return normally from
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* pthread_once and so numThreads should never be incremented. However,
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* numOnce should be incremented by every thread (NUM_THREADS*NUM_ONCE).
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*/
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assert(numOnce.i == NUM_ONCE * NUM_THREADS);
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assert(numThreads.i == 0);
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DeleteCriticalSection(&numOnce.cs);
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DeleteCriticalSection(&numThreads.cs);
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return 0;
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}
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