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/*
* Copyright (C) 2014 Hamburg University of Applied Sciences (HAW)
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief simple condition variable test application
*
* @author Martin Landsmann <martin.landsmann@haw-hamburg.de>
*
* @}
*/
#include <stdio.h>
#include "pthread.h"
#include "thread.h"
static mutex_t mutex = MUTEX_INIT;
static pthread_cond_t cv;
static volatile int is_finished;
static volatile long count;
static volatile long expected_value;
static char stack[THREAD_STACKSIZE_MAIN];
/**
* @brief This thread tries to lock the mutex to enter the critical section.
* Then it signals one waiting thread to check the condition and it goes to sleep again
* If is_finished is set to 1 second_thread ends
*/
static void *second_thread(void *arg)
{
(void) arg;
while (1) {
mutex_lock(&mutex);
if (is_finished == 1) {
break;
}
pthread_cond_signal(&cv);
mutex_unlock_and_sleep(&mutex);
}
return NULL;
}
int main(void)
{
count = 0;
is_finished = 0;
expected_value = 1000ul * 1000ul;
pthread_cond_init(&cv, NULL);
kernel_pid_t pid = thread_create(stack,sizeof(stack), THREAD_PRIORITY_MAIN - 1,
THREAD_CREATE_WOUT_YIELD | THREAD_CREATE_STACKTEST,
second_thread, NULL, "second_thread");
while (1) {
mutex_lock(&mutex);
thread_wakeup(pid);
count++;
if ((count % 100000) == 0) {
printf("Still alive alternated [count: %ldk] times.\n", count / 1000);
}
if (count == expected_value) {
puts("condition fulfilled.");
is_finished = 1;
mutex_unlock(&mutex);
return 0;
}
pthread_cond_wait(&cv, &mutex);
mutex_unlock(&mutex);
}
}
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