Rev 1104 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 1702 | cejka | 29 | /** @addtogroup sync |
| 30 | * @{ |
||
| 31 | */ |
||
| 32 | /** @file |
||
| 33 | */ |
||
| 34 | |||
| 1 | jermar | 35 | #ifndef __SPINLOCK_H__ |
| 36 | #define __SPINLOCK_H__ |
||
| 37 | |||
| 38 | #include <arch/types.h> |
||
| 39 | #include <typedefs.h> |
||
| 223 | jermar | 40 | #include <preemption.h> |
| 1104 | jermar | 41 | #include <atomic.h> |
| 1100 | palkovsky | 42 | #include <debug.h> |
| 1 | jermar | 43 | |
| 458 | decky | 44 | #ifdef CONFIG_SMP |
| 1 | jermar | 45 | struct spinlock { |
| 552 | palkovsky | 46 | #ifdef CONFIG_DEBUG_SPINLOCK |
| 47 | char *name; |
||
| 48 | #endif |
||
| 625 | palkovsky | 49 | atomic_t val; |
| 1 | jermar | 50 | }; |
| 51 | |||
| 623 | jermar | 52 | /* |
| 53 | * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks, |
||
| 54 | * where the lock gets initialized in run time. |
||
| 55 | */ |
||
| 56 | #define SPINLOCK_DECLARE(slname) spinlock_t slname |
||
| 57 | |||
| 58 | /* |
||
| 59 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
||
| 60 | * It declares and initializes the lock. |
||
| 61 | */ |
||
| 62 | #ifdef CONFIG_DEBUG_SPINLOCK |
||
| 63 | #define SPINLOCK_INITIALIZE(slname) \ |
||
| 64 | spinlock_t slname = { \ |
||
| 65 | .name = #slname, \ |
||
| 625 | palkovsky | 66 | .val = { 0 } \ |
| 623 | jermar | 67 | } |
| 68 | #else |
||
| 69 | #define SPINLOCK_INITIALIZE(slname) \ |
||
| 70 | spinlock_t slname = { \ |
||
| 625 | palkovsky | 71 | .val = { 0 } \ |
| 623 | jermar | 72 | } |
| 73 | #endif |
||
| 74 | |||
| 552 | palkovsky | 75 | extern void spinlock_initialize(spinlock_t *sl, char *name); |
| 1 | jermar | 76 | extern int spinlock_trylock(spinlock_t *sl); |
| 1100 | palkovsky | 77 | extern void spinlock_lock_debug(spinlock_t *sl); |
| 1 | jermar | 78 | |
| 1100 | palkovsky | 79 | #ifdef CONFIG_DEBUG_SPINLOCK |
| 80 | # define spinlock_lock(x) spinlock_lock_debug(x) |
||
| 1 | jermar | 81 | #else |
| 1100 | palkovsky | 82 | # define spinlock_lock(x) atomic_lock_arch(&(x)->val) |
| 83 | #endif |
||
| 1 | jermar | 84 | |
| 1100 | palkovsky | 85 | /** Unlock spinlock |
| 86 | * |
||
| 87 | * Unlock spinlock. |
||
| 88 | * |
||
| 89 | * @param sl Pointer to spinlock_t structure. |
||
| 90 | */ |
||
| 91 | static inline void spinlock_unlock(spinlock_t *sl) |
||
| 92 | { |
||
| 93 | ASSERT(atomic_get(&sl->val) != 0); |
||
| 94 | |||
| 95 | /* |
||
| 96 | * Prevent critical section code from bleeding out this way down. |
||
| 97 | */ |
||
| 98 | CS_LEAVE_BARRIER(); |
||
| 99 | |||
| 100 | atomic_set(&sl->val,0); |
||
| 101 | preemption_enable(); |
||
| 102 | } |
||
| 103 | |||
| 104 | #else |
||
| 105 | |||
| 623 | jermar | 106 | /* On UP systems, spinlocks are effectively left out. */ |
| 107 | #define SPINLOCK_DECLARE(name) |
||
| 108 | #define SPINLOCK_INITIALIZE(name) |
||
| 1 | jermar | 109 | |
| 553 | palkovsky | 110 | #define spinlock_initialize(x,name) |
| 223 | jermar | 111 | #define spinlock_lock(x) preemption_disable() |
| 112 | #define spinlock_trylock(x) (preemption_disable(), 1) |
||
| 113 | #define spinlock_unlock(x) preemption_enable() |
||
| 1 | jermar | 114 | |
| 115 | #endif |
||
| 116 | |||
| 117 | #endif |
||
| 1702 | cejka | 118 | |
| 119 | /** @} |
||
| 120 | */ |
||
| 121 |