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/*
* Copyright (C) 2011 Tobias Brunner
* 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.
*/
#include <semaphore.h>
#include <library.h>
#include "semaphore.h"
typedef struct private_semaphore_t private_semaphore_t;
/**
* private data of a semaphore
*/
struct private_semaphore_t {
/**
* public interface
*/
semaphore_t public;
/**
* wrapped POSIX semaphore object
*/
sem_t sem;
};
METHOD(semaphore_t, wait_, void,
private_semaphore_t *this)
{
sem_wait(&this->sem);
}
METHOD(semaphore_t, timed_wait_abs, bool,
private_semaphore_t *this, timeval_t tv)
{
timespec_t ts;
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = tv.tv_usec * 1000;
/* there are errors other than ETIMEDOUT possible, but we consider them
* all as timeout */
return sem_timedwait(&this->sem, &ts) == -1;
}
METHOD(semaphore_t, timed_wait, bool,
private_semaphore_t *this, u_int timeout)
{
timeval_t tv, add;
add.tv_sec = timeout / 1000;
add.tv_usec = (timeout % 1000) * 1000;
time_monotonic(&tv);
timeradd(&tv, &add, &tv);
return timed_wait_abs(this, tv);
}
METHOD(semaphore_t, post, void,
private_semaphore_t *this)
{
sem_post(&this->sem);
}
METHOD(semaphore_t, destroy, void,
private_semaphore_t *this)
{
sem_destroy(&this->sem);
free(this);
}
/*
* Described in header
*/
semaphore_t *semaphore_create(u_int value)
{
private_semaphore_t *this;
INIT(this,
.public = {
.wait = _wait_,
.timed_wait = _timed_wait,
.timed_wait_abs = _timed_wait_abs,
.post = _post,
.destroy = _destroy,
},
);
sem_init(&this->sem, 0, value);
return &this->public;
}
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