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/*
* 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.
*
* $Id: mutex.c 3589 2008-03-13 14:14:44Z martin $
*/
#include "mutex.h"
#include <library.h>
#include <debug.h>
#include <pthread.h>
#include <sys/time.h>
#include <time.h>
#include <errno.h>
typedef struct private_mutex_t private_mutex_t;
typedef struct private_n_mutex_t private_n_mutex_t;
typedef struct private_r_mutex_t private_r_mutex_t;
typedef struct private_condvar_t private_condvar_t;
/**
* private data of mutex
*/
struct private_mutex_t {
/**
* public functions
*/
mutex_t public;
/**
* wrapped pthread mutex
*/
pthread_mutex_t mutex;
};
/**
* private data of mutex, extended by recursive locking information
*/
struct private_r_mutex_t {
/**
* public functions
*/
private_mutex_t generic;
/**
* thread which currently owns mutex
*/
pthread_t thread;
/**
* times we have locked the lock
*/
int times;
};
/**
* private data of condvar
*/
struct private_condvar_t {
/**
* public functions
*/
condvar_t public;
/**
* wrapped pthread condvar
*/
pthread_cond_t condvar;
};
/**
* Implementation of mutex_t.lock.
*/
static void lock(private_mutex_t *this)
{
if (pthread_mutex_lock(&this->mutex))
{
DBG1("!!!! MUTEX %sLOCK ERROR, your code is buggy !!!", "");
}
}
/**
* Implementation of mutex_t.unlock.
*/
static void unlock(private_mutex_t *this)
{
if (pthread_mutex_unlock(&this->mutex))
{
DBG1("!!!! MUTEX %sLOCK ERROR, your code is buggy !!!", "UN");
}
}
/**
* Implementation of mutex_t.lock.
*/
static void lock_r(private_r_mutex_t *this)
{
pthread_t self = pthread_self();
if (this->thread == self)
{
this->times++;
return;
}
lock(&this->generic);
this->thread = self;
this->times = 1;
}
/**
* Implementation of mutex_t.unlock.
*/
static void unlock_r(private_r_mutex_t *this)
{
if (--this->times == 0)
{
this->thread = 0;
unlock(&this->generic);
}
}
/**
* Implementation of mutex_t.destroy
*/
static void mutex_destroy(private_mutex_t *this)
{
pthread_mutex_destroy(&this->mutex);
free(this);
}
/*
* see header file
*/
mutex_t *mutex_create(mutex_type_t type)
{
switch (type)
{
case MUTEX_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;
pthread_mutex_init(&this->generic.mutex, NULL);
this->thread = 0;
this->times = 0;
return &this->generic.public;
}
case MUTEX_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);
return &this->public;
}
}
}
/**
* Implementation of condvar_t.wait.
*/
static void wait(private_condvar_t *this, private_mutex_t *mutex)
{
pthread_cond_wait(&this->condvar, &mutex->mutex);
}
/**
* Implementation of condvar_t.timed_wait.
*/
static bool timed_wait(private_condvar_t *this, private_mutex_t *mutex,
u_int timeout)
{
struct timespec ts;
struct timeval tv;
u_int s, ms;
gettimeofday(&tv, NULL);
s = timeout / 1000;
ms = timeout % 1000;
ts.tv_sec = tv.tv_sec + s;
ts.tv_nsec = tv.tv_usec * 1000 + ms * 1000000;
if (ts.tv_nsec > 1000000000 /* 1s */)
{
ts.tv_nsec -= 1000000000;
ts.tv_sec++;
}
return (pthread_cond_timedwait(&this->condvar, &mutex->mutex,
&ts) == ETIMEDOUT);
}
/**
* Implementation of condvar_t.signal.
*/
static void signal(private_condvar_t *this)
{
pthread_cond_signal(&this->condvar);
}
/**
* Implementation of condvar_t.broadcast.
*/
static void broadcast(private_condvar_t *this)
{
pthread_cond_broadcast(&this->condvar);
}
/**
* Implementation of condvar_t.destroy
*/
static void condvar_destroy(private_condvar_t *this)
{
pthread_cond_destroy(&this->condvar);
free(this);
}
/*
* see header file
*/
condvar_t *condvar_create(condvar_type_t type)
{
switch (type)
{
case CONDVAR_DEFAULT:
default:
{
private_condvar_t *this = malloc_thing(private_condvar_t);
this->public.wait = (void(*)(condvar_t*, mutex_t *mutex))wait;
this->public.timed_wait = (bool(*)(condvar_t*, mutex_t *mutex, u_int timeout))timed_wait;
this->public.signal = (void(*)(condvar_t*))signal;
this->public.broadcast = (void(*)(condvar_t*))broadcast;
this->public.destroy = (void(*)(condvar_t*))condvar_destroy;
pthread_cond_init(&this->condvar, NULL);
return &this->public;
}
}
}
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