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/*
* Copyright (C) 2012 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 <unistd.h> /* for _POSIX_SPIN_LOCKS */
#include <pthread.h>
#include <library.h>
#include <debug.h>
#include "spinlock.h"
#include "mutex.h"
#include "lock_profiler.h"
#if defined(_POSIX_SPIN_LOCKS) && _POSIX_SPIN_LOCKS == -1
#undef _POSIX_SPIN_LOCKS
#endif
typedef struct private_spinlock_t private_spinlock_t;
/**
* private data
*/
struct private_spinlock_t {
/**
* public functions
*/
spinlock_t public;
#ifdef _POSIX_SPIN_LOCKS
/**
* wrapped pthread spin lock
*/
pthread_spinlock_t spinlock;
/**
* profiling info, if enabled (the mutex below does profile itself)
*/
lock_profile_t profile;
#else /* _POSIX_SPIN_LOCKS */
/**
* use a mutex if spin locks are not available
*/
mutex_t *mutex;
#endif /* _POSIX_SPIN_LOCKS */
};
METHOD(spinlock_t, lock, void,
private_spinlock_t *this)
{
#ifdef _POSIX_SPIN_LOCKS
int err;
profiler_start(&this->profile);
err = pthread_spin_lock(&this->spinlock);
if (err)
{
DBG1(DBG_LIB, "!!! SPIN LOCK LOCK ERROR: %s !!!", strerror(err));
}
profiler_end(&this->profile);
#else
this->mutex->lock(this->mutex);
#endif
}
METHOD(spinlock_t, unlock, void,
private_spinlock_t *this)
{
#ifdef _POSIX_SPIN_LOCKS
int err;
err = pthread_spin_unlock(&this->spinlock);
if (err)
{
DBG1(DBG_LIB, "!!! SPIN LOCK UNLOCK ERROR: %s !!!", strerror(err));
}
#else
this->mutex->unlock(this->mutex);
#endif
}
METHOD(spinlock_t, destroy, void,
private_spinlock_t *this)
{
#ifdef _POSIX_SPIN_LOCKS
profiler_cleanup(&this->profile);
pthread_spin_destroy(&this->spinlock);
#else
this->mutex->destroy(this->mutex);
#endif
free(this);
}
/*
* Described in header
*/
spinlock_t *spinlock_create()
{
private_spinlock_t *this;
INIT(this,
.public = {
.lock = _lock,
.unlock = _unlock,
.destroy = _destroy,
},
);
#ifdef _POSIX_SPIN_LOCKS
pthread_spin_init(&this->spinlock, PTHREAD_PROCESS_PRIVATE);
profiler_init(&this->profile);
#else
#warning Using mutexes as spin lock alternatives
this->mutex = mutex_create(MUTEX_TYPE_DEFAULT);
#endif
return &this->public;
}
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