137 lines
3.3 KiB
C++
137 lines
3.3 KiB
C++
/*
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* \brief POSIX thread and semaphore test
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* \author Christian Prochaska
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* \date 2012-04-04
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*/
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/*
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* Copyright (C) 2012-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <pthread.h>
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#include <semaphore.h>
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#include <stdio.h>
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#include <stdlib.h>
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enum { NUM_THREADS = 2 };
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struct Thread_args {
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int thread_num;
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sem_t thread_finished_sem;
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pthread_t thread_id_self; /* thread ID returned by 'pthread_self()' */
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};
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struct Thread {
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Thread_args thread_args;
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pthread_t thread_id_create; /* thread ID returned by 'pthread_create()' */
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};
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void *thread_func(void *arg)
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{
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Thread_args *thread_args = (Thread_args*)arg;
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printf("thread %d: running, my thread ID is %p\n",
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thread_args->thread_num, pthread_self());
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thread_args->thread_id_self = pthread_self();
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sem_post(&thread_args->thread_finished_sem);
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/* sleep forever */
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sem_t sleep_sem;
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sem_init(&sleep_sem, 0, 0);
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sem_wait(&sleep_sem);
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return 0;
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}
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static inline void compare_semaphore_values(int reported_value, int expected_value)
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{
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if (reported_value != expected_value) {
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printf("error: sem_getvalue() did not return the expected value\n");
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exit(-1);
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}
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}
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int main(int argc, char **argv)
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{
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printf("--- pthread test ---\n");
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pthread_t pthread_main = pthread_self();
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printf("main thread: running, my thread ID is %p\n", pthread_main);
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if (!pthread_main)
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return -1;
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Thread thread[NUM_THREADS];
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for (int i = 0; i < NUM_THREADS; i++) {
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thread[i].thread_args.thread_num = i + 1;
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printf("main thread: creating semaphore for thread %d\n",
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thread[i].thread_args.thread_num);
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if (sem_init(&thread[i].thread_args.thread_finished_sem, 0, 1) != 0) {
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printf("sem_init() failed\n");
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return -1;
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}
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/* check result of 'sem_getvalue()' before and after calling 'sem_wait()' */
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int sem_value = -1;
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sem_getvalue(&thread[i].thread_args.thread_finished_sem, &sem_value);
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compare_semaphore_values(sem_value, 1);
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sem_wait(&thread[i].thread_args.thread_finished_sem);
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sem_getvalue(&thread[i].thread_args.thread_finished_sem, &sem_value);
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compare_semaphore_values(sem_value, 0);
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thread[i].thread_args.thread_id_self = 0;
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printf("main thread: creating thread %d\n", thread[i].thread_args.thread_num);
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if (pthread_create(&thread[i].thread_id_create, 0, thread_func,
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&thread[i].thread_args) != 0) {
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printf("error: pthread_create() failed\n");
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return -1;
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}
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printf("main thread: thread %d has thread ID %p\n",
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thread[i].thread_args.thread_num, thread[i].thread_id_create);
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}
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printf("main thread: waiting for the threads to finish\n");
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for (int i = 0; i < NUM_THREADS; i++)
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sem_wait(&thread[i].thread_args.thread_finished_sem);
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printf("main thread: comparing the thread IDs\n");
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for (int i = 0; i < NUM_THREADS; i++)
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if (thread[i].thread_args.thread_id_self != thread[i].thread_id_create) {
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printf("error: thread IDs don't match\n");
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}
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printf("main thread: destroying the threads\n");
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for (int i = 0; i < NUM_THREADS; i++)
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pthread_cancel(thread[i].thread_id_create);
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printf("main thread: destroying the semaphores\n");
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for (int i = 0; i < NUM_THREADS; i++)
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sem_destroy(&thread[i].thread_args.thread_finished_sem);
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printf("--- returning from main ---\n");
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return 0;
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}
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