| 0,0 → 1,79 |
|---|
| /* |
| * 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. |
| */ |
| |
| #include <arch.h> |
| |
| #ifdef __SMP__ |
| #include <arch/atomic.h> |
| #endif |
| |
| #include <synch/spinlock.h> |
| |
| #ifdef __SMP__ |
| |
| void spinlock_initialize(spinlock_t *sl) |
| { |
| sl->val = 0; |
| } |
| |
| #ifdef DEBUG_SPINLOCK |
| void spinlock_lock(spinlock_t *sl) |
| { |
| int i = 0; |
| __address caller = ((__u32 *) &sl)[-1]; |
| |
| while (test_and_set(&sl->val)) { |
| if (i++ > 300000) { |
| printf("cpu%d: looping on spinlock %X, caller=%X\n", the->cpu->id, sl, caller); |
| i = 0; |
| } |
| } |
| |
| } |
| #else |
| void spinlock_lock(spinlock_t *sl) |
| { |
| /* |
| * Each architecture has its own efficient/recommended |
| * implementation of spinlock. |
| */ |
| spinlock_arch(&sl->val); |
| } |
| #endif |
| |
| int spinlock_trylock(spinlock_t *sl) |
| { |
| return !test_and_set(&sl->val); |
| } |
| |
| void spinlock_unlock(spinlock_t *sl) |
| { |
| sl->val = 0; |
| } |
| |
| #endif |