83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#define N_THREADS 100
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static pthread_once_t once = PTHREAD_ONCE_INIT;
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static int global_count = 0;
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static void
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once_function( void )
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{
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struct timespec ts;
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global_count += 1;
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ts.tv_sec = 2;
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ts.tv_nsec = 0;
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nanosleep (&ts, NULL);
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}
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static void*
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thread_function(void* arg)
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{
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pthread_once( &once, once_function );
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if (global_count != 1) {
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printf ("thread %ld: global == %d\n", (long int) arg, global_count);
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exit (1);
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}
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return NULL;
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}
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int main( void )
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{
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pthread_t threads[N_THREADS];
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int nn;
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for (nn = 0; nn < N_THREADS; nn++) {
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if (pthread_create( &threads[nn], NULL, thread_function, (void*)(long int)nn) < 0) {
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printf("creation of thread %d failed\n", nn);
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return 1;
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}
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}
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for (nn = 0; nn < N_THREADS; nn++) {
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if (pthread_join(threads[nn], NULL)) {
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printf("joining thread %d failed\n", nn);
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return 1;
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}
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}
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return 0;
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}
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