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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 |