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#include "unity.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/delay.h>
#define NUM_THREADS 3
#define COUNT_LIMIT 12
#define TCOUNT 10
static int count = 0;
static pthread_t threads[NUM_THREADS];
static pthread_mutex_t count_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t count_threshold_cv = PTHREAD_COND_INITIALIZER;
static void *inc_count(void *args) {
int i;
int ret;
for (i=0; i< TCOUNT; i++) {
ret = pthread_mutex_lock(&count_mutex);
TEST_ASSERT(ret == 0);
count++;
// If condition is reached signal condition
if (count == COUNT_LIMIT) {
ret = pthread_cond_signal(&count_threshold_cv);
TEST_ASSERT(ret == 0);
}
ret = pthread_mutex_unlock(&count_mutex);
TEST_ASSERT(ret == 0);
// Simulate some work
usleep(1000);
}
return NULL;
}
static void *watch_count(void *args) {
int ret;
ret = pthread_mutex_lock(&count_mutex);
TEST_ASSERT(ret == 0);
while (count < COUNT_LIMIT) {
ret = pthread_cond_wait(&count_threshold_cv, &count_mutex);
TEST_ASSERT(ret == 0);
}
count += 125;
TEST_ASSERT (count == 125 + COUNT_LIMIT);
ret = pthread_mutex_unlock(&count_mutex);
TEST_ASSERT(ret == 0);
return NULL;
}
TEST_CASE("pthread conditions", "[pthread]") {
pthread_attr_t attr;
int i, ret;
// Initialize mutex and condition variable objects
ret = pthread_mutex_init(&count_mutex, NULL);
TEST_ASSERT(ret == 0);
ret = pthread_cond_init(&count_threshold_cv, NULL);
TEST_ASSERT(ret == 0);
ret = pthread_attr_init(&attr);
TEST_ASSERT(ret == 0);
ret = pthread_attr_setstacksize(&attr, 10240);
TEST_ASSERT(ret == 0);
ret = pthread_create(&threads[0], &attr, watch_count, NULL);
TEST_ASSERT(ret == 0);
ret = pthread_create(&threads[1], &attr, inc_count, NULL);
TEST_ASSERT(ret == 0);
ret = pthread_create(&threads[2], &attr, inc_count, NULL);
TEST_ASSERT(ret == 0);
// Wait for all threads completion
for (i=0; i< NUM_THREADS; i++) {
ret = pthread_join(threads[i], NULL);
TEST_ASSERT(ret == 0);
}
// Clean up
ret = pthread_attr_destroy(&attr);
TEST_ASSERT(ret == 0);
ret = pthread_mutex_destroy(&count_mutex);
TEST_ASSERT(ret == 0);
ret = pthread_cond_destroy(&count_threshold_cv);
TEST_ASSERT(ret == 0);
}
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