138 lines
3.3 KiB
Bash
Executable File
138 lines
3.3 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
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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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# 1. 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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# 2. 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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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT 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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# panic: spin lock held too long
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# Test program and scenario by Peter Wemm <peter@FreeBSD.org>
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. ../default.cfg
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odir=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $odir/$0 > pth.c
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mycc -o pth -Wall pth.c -pthread
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rm -f pth.c
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cd $odir
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for i in `jot 2000`; do
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/tmp/pth 2>/dev/null
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done
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rm -f /tmp/pth
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exit
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EOF
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#include <pthread.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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static pthread_t worker1_thr;
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static pthread_t worker2_thr;
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static pthread_mutex_t worker_mtx;
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static pthread_cond_t worker_go;
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static pthread_cond_t worker_done;
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struct workitem {
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struct workitem *next;
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int a, b;
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};
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struct workitem *head;
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static void *
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worker(void *arg)
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{
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struct workitem *w;
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pthread_detach(pthread_self());
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fprintf(stderr, "WORKER: started %p\n", arg); fflush(stderr);
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for (;;) {
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pthread_mutex_lock(&worker_mtx);
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while (head == NULL) {
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pthread_cond_wait(&worker_go, &worker_mtx);
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}
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w = head;
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head = w->next;
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pthread_mutex_unlock(&worker_mtx);
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fprintf(stderr, "WORKER(%p): got work a=%d b=%d\n", arg, w->a, w->b); fflush(stderr);
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free(w);
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pthread_cond_signal(&worker_done);
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}
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}
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void
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work_add(int a, int b)
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{
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struct workitem *w;
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int dowake = 0;
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w = calloc(sizeof(*w), 1);
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w->a = a;
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w->b = b;
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pthread_mutex_lock(&worker_mtx);
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if (head == 0)
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dowake = 1;
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w->next = head;
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head = w;
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pthread_mutex_unlock(&worker_mtx);
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if (dowake)
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pthread_cond_signal(&worker_go);
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}
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int
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main()
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{
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pthread_mutex_init(&worker_mtx, NULL);
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pthread_cond_init(&worker_go, NULL);
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pthread_cond_init(&worker_done, NULL);
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fprintf(stderr, "pthread create\n"); fflush(stderr);
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pthread_create(&worker1_thr, NULL, worker, (void *)1);
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pthread_create(&worker2_thr, NULL, worker, (void *)2);
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work_add(10, 15);
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work_add(11, 22);
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work_add(314, 159);
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pthread_mutex_lock(&worker_mtx);
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while (head != NULL) {
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pthread_cond_wait(&worker_done, &worker_mtx);
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}
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pthread_mutex_unlock(&worker_mtx);
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fprintf(stderr, "job complete\n"); fflush(stderr);
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exit(0);
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}
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