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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* mutex.cc
*
* Thu Nov 12 10:51:32 CET 2009
* Copyright 2009 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pracro.
*
* Pracro is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Pracro is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pracro; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "mutex.h"
#include "debug.h"
#define MUTEX_DBG(x)
//#define MUTEX_DBG(x) x
Mutex::Mutex()
{
pthread_mutex_init (&mutex, NULL);
}
Mutex::~Mutex()
{
pthread_mutex_destroy(&mutex);
}
bool Mutex::trylock()
{
bool ret = pthread_mutex_trylock(&mutex) == 0;
if(ret) MUTEX_DBG(printf("trylock succeeded on %s\n", name.c_str()));
else MUTEX_DBG(printf("trylock failed on %s\n", name.c_str()));
return ret;
}
void Mutex::lock()
{
pthread_mutex_lock(&mutex);
MUTEX_DBG(printf("lock on %s\n", name.c_str()));
}
void Mutex::unlock()
{
MUTEX_DBG(printf("unlock on %s\n", name.c_str()));
pthread_mutex_unlock(&mutex);
}
MutexAutolock::MutexAutolock(Mutex &m)
: mutex(m)
{
mutex.lock();
}
MutexAutolock::~MutexAutolock()
{
mutex.unlock();
}
#ifdef TEST_MUTEX
//deps:
//cflags: $(PTHREAD_CFLAGS)
//libs: $(PTHREAD_LIBS)
#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/*TEST_MUTEX*/
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