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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
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* Copyright (c) 2016, Daniel Krebs, RWTH Aachen University
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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 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 the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <signal.h>
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#include <pthread.h>
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#include <hermit/syscall.h>
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#define THREAD_COUNT_DEFAULT 2
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static volatile __thread int alive = 1;
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static volatile __thread int thread_id;
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pthread_barrier_t barrier;
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pthread_barrierattr_t attr;
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static void sighandler(int sig)
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{
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printf("[%d] Received signal %d\n", thread_id, sig);
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alive = 0;
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}
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void* thread_func(void* arg)
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{
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thread_id = *((int*) arg);
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printf("[%d] Hello (task ID: %d)\n", thread_id, sys_getpid());
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// register signal handler
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signal(16, sighandler);
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// make sure all threads are running before main threads starts sending
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// signals
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pthread_barrier_wait(&barrier);
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// stay here until signal received
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while(alive);
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printf("[%d] I'm done\n", thread_id);
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return 0;
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}
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int main(int argc, char** argv)
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{
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size_t thread_count = THREAD_COUNT_DEFAULT;
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if(argc == 2) {
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thread_count = strtoul(argv[1], NULL, 10);
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}
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pthread_t threads[thread_count];
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unsigned int i, param[thread_count];
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int ret;
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// if we send the signals too early some threads might not have registered
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// a signal handler yet
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pthread_barrier_init(&barrier, &attr, thread_count + 1);
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for(i = 0; i < thread_count; i++) {
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param[i] = i;
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ret = pthread_create(threads+i, NULL, thread_func, (void*) ¶m[i]);
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if (ret) {
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printf("Thread creation failed! error = %d\n", ret);
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return ret;
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} else printf("Create thread %d\n", i);
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}
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pthread_barrier_wait(&barrier);
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for(i = 0; i < thread_count; i++) {
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printf("Send signal to thread %d\n", i);
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pthread_kill(threads[i], 16);
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}
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sys_msleep(500);
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printf("Wait for all threads to finish\n");
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for(i = 0; i < thread_count; i++) {
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pthread_join(threads[i], NULL);
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printf("Thread %d is done\n", i);
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}
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printf("All done\n");
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return 0;
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}
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