| 0,0 → 1,121 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * 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 name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup sync |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #ifndef __SPINLOCK_H__ |
| #define __SPINLOCK_H__ |
| |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <preemption.h> |
| #include <atomic.h> |
| #include <debug.h> |
| |
| #ifdef CONFIG_SMP |
| struct spinlock { |
| #ifdef CONFIG_DEBUG_SPINLOCK |
| char *name; |
| #endif |
| atomic_t val; |
| }; |
| |
| /* |
| * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks, |
| * where the lock gets initialized in run time. |
| */ |
| #define SPINLOCK_DECLARE(slname) spinlock_t slname |
| |
| /* |
| * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
| * It declares and initializes the lock. |
| */ |
| #ifdef CONFIG_DEBUG_SPINLOCK |
| #define SPINLOCK_INITIALIZE(slname) \ |
| spinlock_t slname = { \ |
| .name = #slname, \ |
| .val = { 0 } \ |
| } |
| #else |
| #define SPINLOCK_INITIALIZE(slname) \ |
| spinlock_t slname = { \ |
| .val = { 0 } \ |
| } |
| #endif |
| |
| extern void spinlock_initialize(spinlock_t *sl, char *name); |
| extern int spinlock_trylock(spinlock_t *sl); |
| extern void spinlock_lock_debug(spinlock_t *sl); |
| |
| #ifdef CONFIG_DEBUG_SPINLOCK |
| # define spinlock_lock(x) spinlock_lock_debug(x) |
| #else |
| # define spinlock_lock(x) atomic_lock_arch(&(x)->val) |
| #endif |
| |
| /** Unlock spinlock |
| * |
| * Unlock spinlock. |
| * |
| * @param sl Pointer to spinlock_t structure. |
| */ |
| static inline void spinlock_unlock(spinlock_t *sl) |
| { |
| ASSERT(atomic_get(&sl->val) != 0); |
| |
| /* |
| * Prevent critical section code from bleeding out this way down. |
| */ |
| CS_LEAVE_BARRIER(); |
| |
| atomic_set(&sl->val,0); |
| preemption_enable(); |
| } |
| |
| #else |
| |
| /* On UP systems, spinlocks are effectively left out. */ |
| #define SPINLOCK_DECLARE(name) |
| #define SPINLOCK_INITIALIZE(name) |
| |
| #define spinlock_initialize(x,name) |
| #define spinlock_lock(x) preemption_disable() |
| #define spinlock_trylock(x) (preemption_disable(), 1) |
| #define spinlock_unlock(x) preemption_enable() |
| |
| #endif |
| |
| #endif |
| |
| /** @} |
| */ |
| |