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annotate src/thread/dc/SDL_sysmutex.c @ 1312:c9b51268668f

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Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents b8d311d90021
children 3692456e7b0f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* An implementation of mutexes using semaphores */
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24
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27
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28 #include "SDL_error.h"
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29 #include "SDL_thread.h"
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30 #include "SDL_systhread_c.h"
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31
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32 #include <arch/spinlock.h>
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33
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34 struct SDL_mutex {
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35 int recursive;
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36 Uint32 owner;
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37 spinlock_t mutex;
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38 };
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39
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40 /* Create a mutex */
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41 SDL_mutex *SDL_CreateMutex(void)
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42 {
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43 SDL_mutex *mutex;
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44
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45 /* Allocate mutex memory */
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46 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
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47 if ( mutex ) {
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48 spinlock_init(&mutex->mutex);
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49 mutex->recursive = 0;
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50 mutex->owner = 0;
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51 } else {
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52 SDL_OutOfMemory();
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53 }
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54 return mutex;
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55 }
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56
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57 /* Free the mutex */
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58 void SDL_DestroyMutex(SDL_mutex *mutex)
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59 {
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60 if ( mutex ) {
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61 free(mutex);
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62 }
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63 }
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64
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65 /* Lock the semaphore */
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66 int SDL_mutexP(SDL_mutex *mutex)
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67 {
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68 #ifdef DISABLE_THREADS
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69 return 0;
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70 #else
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71 Uint32 this_thread;
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72
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73 if ( mutex == NULL ) {
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74 SDL_SetError("Passed a NULL mutex");
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75 return -1;
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76 }
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77
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78 this_thread = SDL_ThreadID();
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79 if ( mutex->owner == this_thread ) {
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80 ++mutex->recursive;
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81 } else {
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82 /* The order of operations is important.
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83 We set the locking thread id after we obtain the lock
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84 so unlocks from other threads will fail.
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85 */
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86 spinlock_lock(&mutex->mutex);
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87 mutex->owner = this_thread;
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88 mutex->recursive = 0;
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89 }
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90
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91 return 0;
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92 #endif /* DISABLE_THREADS */
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93 }
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94
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95 /* Unlock the mutex */
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96 int SDL_mutexV(SDL_mutex *mutex)
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97 {
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98 #ifdef DISABLE_THREADS
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99 return 0;
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100 #else
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101 if ( mutex == NULL ) {
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102 SDL_SetError("Passed a NULL mutex");
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103 return -1;
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104 }
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105
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106 /* If we don't own the mutex, we can't unlock it */
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107 if ( SDL_ThreadID() != mutex->owner ) {
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108 SDL_SetError("mutex not owned by this thread");
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109 return -1;
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110 }
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111
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112 if ( mutex->recursive ) {
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113 --mutex->recursive;
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114 } else {
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115 /* The order of operations is important.
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116 First reset the owner so another thread doesn't lock
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117 the mutex and set the ownership before we reset it,
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118 then release the lock semaphore.
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119 */
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120 mutex->owner = 0;
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121 spinlock_unlock(&mutex->mutex);
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122 }
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123 return 0;
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124 #endif /* DISABLE_THREADS */
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125 }