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/*
* Copyright (C) 2008-2009 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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.
*/
#define _GNU_SOURCE
#include <pthread.h>
#include <threading.h>
#include <library.h>
#include <debug.h>
#include "mutex.h"
#include "lock_profiler.h"
/**
* Implementation of mutex_t.lock.
*/
static void lock(private_mutex_t *this)
{
int err;
profiler_start(&this->profile);
err = pthread_mutex_lock(&this->mutex);
if (err)
{
DBG1("!!! MUTEX LOCK ERROR: %s !!!", strerror(err));
}
profiler_end(&this->profile);
}
/**
* Implementation of mutex_t.unlock.
*/
static void unlock(private_mutex_t *this)
{
int err;
err = pthread_mutex_unlock(&this->mutex);
if (err)
{
DBG1("!!! MUTEX UNLOCK ERROR: %s !!!", strerror(err));
}
}
/**
* Implementation of mutex_t.lock.
*/
static void lock_r(private_r_mutex_t *this)
{
pthread_t self = pthread_self();
if (this->thread == self)
{
uintptr_t times;
/* times++ */
times = (uintptr_t)pthread_getspecific(this->times);
pthread_setspecific(this->times, (void*)times + 1);
}
else
{
lock(&this->generic);
this->thread = self;
/* times = 1 */
pthread_setspecific(this->times, (void*)1);
}
}
/**
* Implementation of mutex_t.unlock.
*/
static void unlock_r(private_r_mutex_t *this)
{
uintptr_t times;
/* times-- */
times = (uintptr_t)pthread_getspecific(this->times);
pthread_setspecific(this->times, (void*)--times);
if (times == 0)
{
this->thread = 0;
unlock(&this->generic);
}
}
/**
* Implementation of mutex_t.destroy
*/
static void mutex_destroy(private_mutex_t *this)
{
profiler_cleanup(&this->profile);
pthread_mutex_destroy(&this->mutex);
free(this);
}
/**
* Implementation of mutex_t.destroy for recursive mutex'
*/
static void mutex_destroy_r(private_r_mutex_t *this)
{
profiler_cleanup(&this->generic.profile);
pthread_mutex_destroy(&this->generic.mutex);
pthread_key_delete(this->times);
free(this);
}
/*
* see header file
*/
mutex_t *mutex_create(mutex_type_t type)
{
switch (type)
{
case MUTEX_TYPE_RECURSIVE:
{
private_r_mutex_t *this = malloc_thing(private_r_mutex_t);
this->generic.public.lock = (void(*)(mutex_t*))lock_r;
this->generic.public.unlock = (void(*)(mutex_t*))unlock_r;
this->generic.public.destroy = (void(*)(mutex_t*))mutex_destroy_r;
pthread_mutex_init(&this->generic.mutex, NULL);
pthread_key_create(&this->times, NULL);
this->generic.recursive = TRUE;
profiler_init(&this->generic.profile);
this->thread = 0;
return &this->generic.public;
}
case MUTEX_TYPE_DEFAULT:
default:
{
private_mutex_t *this = malloc_thing(private_mutex_t);
this->public.lock = (void(*)(mutex_t*))lock;
this->public.unlock = (void(*)(mutex_t*))unlock;
this->public.destroy = (void(*)(mutex_t*))mutex_destroy;
pthread_mutex_init(&this->mutex, NULL);
this->recursive = FALSE;
profiler_init(&this->profile);
return &this->public;
}
}
}
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