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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 <stdint.h>
#include <time.h>
#include <errno.h>
#include <threading.h>
#include <library.h>
#include <debug.h>
#include "condvar.h"
#include "mutex.h"
/**
* Implementation of condvar_t.wait.
*/
static void _wait(private_condvar_t *this, private_mutex_t *mutex)
{
if (mutex->recursive)
{
private_r_mutex_t* recursive = (private_r_mutex_t*)mutex;
/* mutex owner gets cleared during condvar wait */
recursive->thread = 0;
pthread_cond_wait(&this->condvar, &mutex->mutex);
recursive->thread = pthread_self();
}
else
{
pthread_cond_wait(&this->condvar, &mutex->mutex);
}
}
/**
* Implementation of condvar_t.timed_wait_abs.
*/
static bool timed_wait_abs(private_condvar_t *this, private_mutex_t *mutex,
timeval_t time)
{
struct timespec ts;
bool timed_out;
ts.tv_sec = time.tv_sec;
ts.tv_nsec = time.tv_usec * 1000;
if (mutex->recursive)
{
private_r_mutex_t* recursive = (private_r_mutex_t*)mutex;
recursive->thread = 0;
timed_out = pthread_cond_timedwait(&this->condvar, &mutex->mutex,
&ts) == ETIMEDOUT;
recursive->thread = pthread_self();
}
else
{
timed_out = pthread_cond_timedwait(&this->condvar, &mutex->mutex,
&ts) == ETIMEDOUT;
}
return timed_out;
}
/**
* Implementation of condvar_t.timed_wait.
*/
static bool timed_wait(private_condvar_t *this, private_mutex_t *mutex,
u_int timeout)
{
timeval_t tv;
u_int s, ms;
time_monotonic(&tv);
s = timeout / 1000;
ms = timeout % 1000;
tv.tv_sec += s;
tv.tv_usec += ms * 1000;
if (tv.tv_usec > 1000000 /* 1s */)
{
tv.tv_usec -= 1000000;
tv.tv_sec++;
}
return timed_wait_abs(this, mutex, tv);
}
/**
* 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_TYPE_DEFAULT:
default:
{
pthread_condattr_t condattr;
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.timed_wait_abs = (bool(*)(condvar_t*, mutex_t *mutex, timeval_t time))timed_wait_abs;
this->public.signal = (void(*)(condvar_t*))_signal;
this->public.broadcast = (void(*)(condvar_t*))broadcast;
this->public.destroy = (void(*)(condvar_t*))condvar_destroy;
pthread_condattr_init(&condattr);
#ifdef HAVE_CONDATTR_CLOCK_MONOTONIC
pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
#endif
pthread_cond_init(&this->condvar, &condattr);
pthread_condattr_destroy(&condattr);
return &this->public;
}
}
}
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