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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 | |||
1702 | cejka | 29 | /** @addtogroup sync |
30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
1 | jermar | 35 | #ifndef __SPINLOCK_H__ |
36 | #define __SPINLOCK_H__ |
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37 | |||
38 | #include <arch/types.h> |
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39 | #include <typedefs.h> |
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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; |
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48 | #endif |
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625 | palkovsky | 49 | atomic_t val; |
1 | jermar | 50 | }; |
51 | |||
623 | jermar | 52 | /* |
53 | * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks, |
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54 | * where the lock gets initialized in run time. |
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55 | */ |
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56 | #define SPINLOCK_DECLARE(slname) spinlock_t slname |
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57 | |||
58 | /* |
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59 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
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60 | * It declares and initializes the lock. |
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61 | */ |
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62 | #ifdef CONFIG_DEBUG_SPINLOCK |
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63 | #define SPINLOCK_INITIALIZE(slname) \ |
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64 | spinlock_t slname = { \ |
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65 | .name = #slname, \ |
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625 | palkovsky | 66 | .val = { 0 } \ |
623 | jermar | 67 | } |
68 | #else |
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69 | #define SPINLOCK_INITIALIZE(slname) \ |
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70 | spinlock_t slname = { \ |
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625 | palkovsky | 71 | .val = { 0 } \ |
623 | jermar | 72 | } |
73 | #endif |
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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) |
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1 | jermar | 81 | #else |
1100 | palkovsky | 82 | # define spinlock_lock(x) atomic_lock_arch(&(x)->val) |
83 | #endif |
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1 | jermar | 84 | |
1100 | palkovsky | 85 | /** Unlock spinlock |
86 | * |
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87 | * Unlock spinlock. |
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88 | * |
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89 | * @param sl Pointer to spinlock_t structure. |
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90 | */ |
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91 | static inline void spinlock_unlock(spinlock_t *sl) |
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92 | { |
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93 | ASSERT(atomic_get(&sl->val) != 0); |
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94 | |||
95 | /* |
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96 | * Prevent critical section code from bleeding out this way down. |
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97 | */ |
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98 | CS_LEAVE_BARRIER(); |
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99 | |||
100 | atomic_set(&sl->val,0); |
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101 | preemption_enable(); |
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102 | } |
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103 | |||
104 | #else |
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105 | |||
623 | jermar | 106 | /* On UP systems, spinlocks are effectively left out. */ |
107 | #define SPINLOCK_DECLARE(name) |
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108 | #define SPINLOCK_INITIALIZE(name) |
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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) |
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113 | #define spinlock_unlock(x) preemption_enable() |
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1 | jermar | 114 | |
115 | #endif |
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116 | |||
117 | #endif |
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1702 | cejka | 118 | |
119 | /** @} |
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120 | */ |
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121 |