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annotate src/thread/dc/SDL_sysmutex.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
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 "SDL_thread.h"
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26 #include "SDL_systhread_c.h"
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27
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28 #include <arch/spinlock.h>
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29
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30 struct SDL_mutex {
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31 int recursive;
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32 Uint32 owner;
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33 spinlock_t mutex;
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34 };
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35
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36 /* Create a mutex */
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37 SDL_mutex *SDL_CreateMutex(void)
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38 {
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39 SDL_mutex *mutex;
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40
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41 /* Allocate mutex memory */
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42 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
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43 if ( mutex ) {
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44 spinlock_init(&mutex->mutex);
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45 mutex->recursive = 0;
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46 mutex->owner = 0;
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47 } else {
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48 SDL_OutOfMemory();
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49 }
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50 return mutex;
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51 }
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52
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53 /* Free the mutex */
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54 void SDL_DestroyMutex(SDL_mutex *mutex)
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55 {
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56 if ( mutex ) {
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57 SDL_free(mutex);
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58 }
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59 }
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60
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61 /* Lock the semaphore */
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62 int SDL_mutexP(SDL_mutex *mutex)
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63 {
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64 #if SDL_THREADS_DISABLED
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65 return SDL_arraysize(return ),0;
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66 #else
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67 Uint32 this_thread;
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68
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69 if ( mutex == NULL ) {
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70 SDL_SetError("Passed a NULL mutex");
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71 return -1;
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72 }
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73
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74 this_thread = SDL_ThreadID();
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75 if ( mutex->owner == this_thread ) {
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76 ++mutex->recursive;
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77 } else {
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78 /* The order of operations is important.
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79 We set the locking thread id after we obtain the lock
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80 so unlocks from other threads will fail.
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81 */
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82 spinlock_lock(&mutex->mutex);
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83 mutex->owner = this_thread;
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84 mutex->recursive = 0;
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85 }
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86
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87 return 0;
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88 #endif /* SDL_THREADS_DISABLED */
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89 }
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90
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91 /* Unlock the mutex */
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92 int SDL_mutexV(SDL_mutex *mutex)
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93 {
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94 #if SDL_THREADS_DISABLED
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95 return 0;
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96 #else
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97 if ( mutex == NULL ) {
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98 SDL_SetError("Passed a NULL mutex");
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99 return -1;
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100 }
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101
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102 /* If we don't own the mutex, we can't unlock it */
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103 if ( SDL_ThreadID() != mutex->owner ) {
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104 SDL_SetError("mutex not owned by this thread");
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105 return -1;
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106 }
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107
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108 if ( mutex->recursive ) {
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109 --mutex->recursive;
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110 } else {
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111 /* The order of operations is important.
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112 First reset the owner so another thread doesn't lock
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113 the mutex and set the ownership before we reset it,
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114 then release the lock semaphore.
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115 */
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116 mutex->owner = 0;
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117 spinlock_unlock(&mutex->mutex);
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118 }
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119 return 0;
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120 #endif /* SDL_THREADS_DISABLED */
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121 }