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#include "mutex.h"
Mutex::Mutex()
{
pthread_mutex_init (&mutex, NULL);
}
Mutex::~Mutex()
{
pthread_mutex_destroy(&mutex);
}
bool Mutex::trylock()
{
return pthread_mutex_trylock(&mutex) == 0;
}
void Mutex::lock()
{
pthread_mutex_lock(&mutex);
}
void Mutex::unlock()
{
pthread_mutex_unlock(&mutex);
}
MutexAutolock::MutexAutolock(Mutex &m)
: mutex(m)
{
mutex.lock();
}
MutexAutolock::~MutexAutolock()
{
mutex.unlock();
}
#ifdef TEST_MUTEX
#include <test.h>
#include <unistd.h>
volatile int cnt = 0;
static void* thread_run(void *data)
{
Mutex *mutex = (Mutex*)data;
mutex->lock();
cnt++;
mutex->unlock();
return NULL;
}
TEST_BEGIN;
Mutex mutex;
mutex.lock();
TEST_FALSE(mutex.trylock(), "Testing if trylock works negative.");
mutex.unlock();
TEST_TRUE(mutex.trylock(), "Testing if trylock works positive.");
mutex.unlock();
mutex.lock();
pthread_attr_t attr;
pthread_t tid;
pthread_attr_init(&attr);
pthread_create(&tid, &attr, thread_run, &mutex);
sleep(1);
TEST_EQUAL_INT(cnt, 0, "Testing if lock prevent cnt from increasing.");
mutex.unlock();
sleep(1);
TEST_EQUAL_INT(cnt, 1, "Testing if unlock makes cnt increase.");
pthread_join(tid, NULL);
pthread_attr_destroy(&attr);
{
TEST_TRUE(mutex.trylock(), "Testing if autolock has not yet locked the mutex.");
mutex.unlock();
MutexAutolock mlock(mutex);
TEST_FALSE(mutex.trylock(), "Testing if autolock worked.");
}
TEST_TRUE(mutex.trylock(), "Testing if autolock has released the lock on the mutex.");
mutex.unlock();
TEST_END;
#endif
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