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78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2018-2020 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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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 <assert.h>
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#define NUM_THREADS 4
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/* Crude spin lock. Threads all spin until this is set to 0. */
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int go = 1;
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/* Thread function, just spin until GO is set to 0. */
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void *
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perform_work (void *argument)
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{
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/* Cast to volatile to ensure that ARGUMENT is loaded each time around
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the loop. */
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while (*((volatile int*) argument))
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{
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/* Nothing. */
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}
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return NULL;
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}
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/* The spin loop for the main thread. */
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void
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function (void)
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{
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(void) perform_work (&go);
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printf ("Finished from function\n");
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}
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/* Main program, create some threads which all spin waiting for GO to be
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set to 0. */
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int
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main (void)
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{
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pthread_t threads[NUM_THREADS];
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int result_code;
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unsigned index;
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/* Create some threads. */
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for (index = 0; index < NUM_THREADS; ++index)
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{
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printf ("In main: creating thread %d\n", index);
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result_code = pthread_create (&threads[index], NULL, perform_work, &go);
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assert (!result_code);
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}
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function ();
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/* Wait for each thread to complete. */
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for (index = 0; index < NUM_THREADS; ++index)
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{
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/* Block until thread INDEX completes. */
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result_code = pthread_join (threads[index], NULL);
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assert (!result_code);
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printf ("In main: thread %d has completed\n", index);
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}
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printf ("In main: All threads completed successfully\n");
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return 0;
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}
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