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pthread: Add support for PTHREAD_COND_INITIALIZER

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Includes unit test for condition variables in C (previous test was C++ only)
This commit is contained in:
Angus Gratton
2021-04-23 10:01:37 +10:00
parent e6d15a0975
commit a6dea64106
5 changed files with 160 additions and 9 deletions
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115
components/pthread/test/test_pthread_cond_var.c Normal file
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#include <pthread.h>
#include "unity.h"
typedef struct {
pthread_cond_t *cond;
pthread_mutex_t *mutex;
unsigned delay_ms;
} thread_args_t;
static void *thread_signals(void *arg)
{
const thread_args_t *targs = (thread_args_t *)arg;
int r;
r = pthread_mutex_lock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_cond_signal(targs->cond);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_mutex_unlock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
usleep(targs->delay_ms * 1000);
r = pthread_mutex_lock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_cond_broadcast(targs->cond);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_mutex_unlock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
return NULL;
}
static void *thread_waits(void *arg)
{
const thread_args_t *targs = (thread_args_t *)arg;
int r;
r = pthread_mutex_lock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_cond_wait(targs->cond, targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_mutex_unlock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
usleep(targs->delay_ms * 1000);
r = pthread_mutex_lock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
struct timespec two_seconds;
clock_gettime(CLOCK_REALTIME, &two_seconds);
two_seconds.tv_sec += 2;
r = pthread_cond_timedwait(targs->cond, targs->mutex, &two_seconds);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_mutex_unlock(targs->mutex);
TEST_ASSERT_EQUAL_INT(0, r);
return NULL;
}
#define NUM_THREADS 3
TEST_CASE("pthread cond wait", "[pthread]")
{
int r;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
struct {
thread_args_t args;
pthread_t thread;
} wait[NUM_THREADS];
struct {
thread_args_t args;
pthread_t thread;
} signal[NUM_THREADS];
wait[0].args.delay_ms = 50;
wait[1].args.delay_ms = 100;
wait[2].args.delay_ms = 200;
signal[0].args.delay_ms = 30;
signal[1].args.delay_ms = 150;
signal[2].args.delay_ms = 500; // highest delay, ensure that broadcast will be received by all waiter threads
for (int i = 0; i < NUM_THREADS; i++) {
wait[i].args.cond = &cond;
wait[i].args.mutex = &mutex;
signal[i].args.cond = &cond;
signal[i].args.mutex = &mutex;
r = pthread_create(&signal[i].thread, NULL, thread_signals, &signal[i].args);
TEST_ASSERT_EQUAL_INT(0, r);
r = pthread_create(&wait[i].thread, NULL, thread_waits, &wait[i].args);
TEST_ASSERT_EQUAL_INT(0, r);
}
for (int i = 0; i < NUM_THREADS; i++) {
r = pthread_join(signal[i].thread, NULL);
TEST_ASSERT_EQUAL_INT(0, r);
pthread_join(wait[i].thread, NULL);
TEST_ASSERT_EQUAL_INT(0, r);
}
pthread_mutex_destroy(&cond);
pthread_mutex_destroy(&mutex);
}