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/*
* Copyright (c) 2006-2012. QLogic Corporation. All rights reserved.
* Copyright (c) 2003-2006, PathScale, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _PSMI_IN_USER_H
#error psm_lock.h not meant to be included directly, include psm_user.h instead
#endif
#ifndef _PSMI_LOCK_H
#define _PSMI_LOCK_H
#ifndef PSMI_USE_PTHREAD_SPINLOCKS
#if defined(__powerpc__)
#define PSMI_USE_PTHREAD_SPINLOCKS 1
#else
#define PSMI_USE_PTHREAD_SPINLOCKS 0
#endif
#endif
#if PSMI_USE_PTHREAD_SPINLOCKS
typedef pthread_spinlock_t psmi_spinlock_t;
#define psmi_spin_init(lock) pthread_spin_init(lock,0)
#define psmi_spin_lock(lock) pthread_spin_lock(lock)
#define psmi_spin_trylock(lock) pthread_spin_trylock(lock)
#define psmi_spin_unlock(lock) pthread_spin_unlock(lock)
#else
typedef ips_atomic_t psmi_spinlock_t;
#define PSMI_SPIN_LOCKED 1
#define PSMI_SPIN_UNLOCKED 0
PSMI_ALWAYS_INLINE(
int
psmi_spin_init(psmi_spinlock_t *lock)) {
ips_atomic_set(lock, PSMI_SPIN_UNLOCKED);
return 0;
}
PSMI_ALWAYS_INLINE(
int
psmi_spin_trylock(psmi_spinlock_t *lock)) {
if (ips_atomic_cmpxchg(lock,PSMI_SPIN_UNLOCKED,PSMI_SPIN_LOCKED)
== PSMI_SPIN_UNLOCKED)
return 0;
else
return EBUSY;
}
PSMI_ALWAYS_INLINE(
int
psmi_spin_lock(psmi_spinlock_t *lock)) {
while (psmi_spin_trylock(lock) == EBUSY)
{}
return 0;
}
PSMI_ALWAYS_INLINE(
int
psmi_spin_unlock(psmi_spinlock_t *lock)) {
atomic_set(lock, PSMI_SPIN_UNLOCKED);
return 0;
}
#endif /* PSMI_USE_PTHREAD_SPINLOCKS */
#endif /* _PSMI_LOCK_H */
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