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107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
/* Copyright (C) 2000 MySQL AB
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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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 <unistd.h>
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#include "my_my_global.h"
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static void spawn_stern_thread(pthread_t *t);
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static int act_goofy(void);
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static void *be_stern(void *);
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static struct {
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pthread_mutex_t lock;
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pthread_cond_t cond;
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int msg;
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} comm = { PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, 0 };
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int
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main(void)
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{
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pthread_t t;
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spawn_stern_thread(&t);
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while (act_goofy() != 0)
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/* do nothing */;
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pthread_exit(NULL);
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/* notreached */
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return EXIT_SUCCESS;
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}
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static void spawn_stern_thread(pthread_t *t)
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{
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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if (pthread_create(t, &attr, be_stern, NULL) != 0)
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exit(EXIT_FAILURE);
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pthread_attr_destroy(&attr);
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}
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static int act_goofy(void)
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{
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int ret;
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char buf[30];
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fputs("Are you ready to act goofy (Y/n)? ", stdout); fflush(stdout);
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fgets(buf, sizeof(buf), stdin);
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pthread_mutex_lock(&comm.lock);
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if (buf[0] == 'y' || buf[0] == '\n') {
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fputs("** Waawlwalkwwwaa!!\n", stdout); fflush(stdout);
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++comm.msg;
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ret = 1;
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}
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else {
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fputs("OK, I hate you. Let me go.\n", stdout); fflush(stdout);
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comm.msg = -1;
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ret = 0;
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}
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pthread_mutex_unlock(&comm.lock);
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pthread_cond_signal(&comm.cond);
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return ret;
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}
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static void *be_stern(void *v __attribute__((unused)))
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{
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int msg;
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for (;;) {
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pthread_mutex_lock(&comm.lock);
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while (comm.msg == 0)
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pthread_cond_wait(&comm.cond, &comm.lock);
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msg = comm.msg;
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comm.msg = 0;
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pthread_mutex_unlock(&comm.lock);
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if (msg < 0)
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break; /* the goofy one learned a lesson! */
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fputs("I HAVE TO BE STERN WITH YOU!\n", stderr);
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fprintf(stderr, "I should give you %d lashes.\n", msg);
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sleep(msg);
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}
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fputs("You are NOTHING!\n", stderr);
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return NULL;
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}
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