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