mirror of
https://github.com/golang/go
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c30d81bd23
more interesting than most R=rsc DELTA=132 (131 added, 0 deleted, 1 changed) OCL=32876 CL=32881
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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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 Computer Language Benchmarks Game" nor the
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name of "The Computer Language Shootout Benchmarks" nor the names of
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its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* The Computer Language Benchmarks Game
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* http://shootout.alioth.debian.org/
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* contributed by Premysl Hruby
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <string.h>
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#include <limits.h>
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#define THREADS (503)
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struct stack {
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char x[PTHREAD_STACK_MIN];
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};
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/* staticaly initialize mutex[0] mutex */
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static pthread_mutex_t mutex[THREADS];
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static int data[THREADS];
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static struct stack stacks[THREADS];
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/* stacks must be defined staticaly, or my i386 box run of virtual memory for this
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* process while creating thread +- #400 */
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static void* thread(void *num)
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{
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int l = (int)num;
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int r = (l+1) % THREADS;
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int token;
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while(1) {
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pthread_mutex_lock(mutex + l);
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token = data[l];
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if (token) {
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data[r] = token - 1;
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pthread_mutex_unlock(mutex + r);
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}
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else {
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printf("%i\n", l+1);
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exit(0);
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}
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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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int i;
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pthread_t cthread;
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pthread_attr_t stack_attr;
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if (argc != 2)
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exit(255);
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data[0] = atoi(argv[1]);
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pthread_attr_init(&stack_attr);
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for (i = 0; i < THREADS; i++) {
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pthread_mutex_init(mutex + i, NULL);
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pthread_mutex_lock(mutex + i);
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pthread_attr_setstack(&stack_attr, &stacks[i], sizeof(struct stack));
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pthread_create(&cthread, &stack_attr, thread, (void*)i);
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}
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pthread_mutex_unlock(mutex + 0);
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pthread_join(cthread, NULL);
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}
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