Mercurial > sdl-ios-xcode
annotate src/thread/nds/SDL_sysmutex.c @ 2670:6e4669f4db49 gsoc2008_nds
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author | Darren Alton <dalton@stevens.edu> |
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date | Tue, 10 Jun 2008 06:57:57 +0000 |
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children | c3e7c0698cbb |
rev | line source |
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2670
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 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 Library 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 Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@devolution.com |
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21 */ |
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22 |
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23 #ifdef SAVE_RCSID |
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24 static char rcsid = |
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25 "@(#) $Id: SDL_sysmutex.c,v 1.2 2001/04/26 16:50:18 hercules Exp $"; |
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26 #endif |
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27 |
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28 /* An implementation of mutexes using semaphores */ |
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29 |
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30 #include <stdio.h> |
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31 #include <stdlib.h> |
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32 |
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33 #include "SDL_error.h" |
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34 #include "SDL_thread.h" |
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35 #include "SDL_systhread_c.h" |
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36 |
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37 |
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38 struct SDL_mutex { |
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39 int recursive; |
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40 Uint32 owner; |
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41 SDL_sem *sem; |
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42 }; |
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43 |
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44 /* Create a mutex */ |
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45 SDL_mutex *SDL_CreateMutex(void) |
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46 { |
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47 SDL_mutex *mutex; |
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48 |
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49 /* Allocate mutex memory */ |
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50 mutex = (SDL_mutex *)malloc(sizeof(*mutex)); |
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51 if ( mutex ) { |
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52 /* Create the mutex semaphore, with initial value 1 */ |
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53 mutex->sem = SDL_CreateSemaphore(1); |
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54 mutex->recursive = 0; |
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55 mutex->owner = 0; |
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56 if ( ! mutex->sem ) { |
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57 free(mutex); |
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58 mutex = NULL; |
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59 } |
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60 } else { |
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61 SDL_OutOfMemory(); |
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62 } |
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63 return mutex; |
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64 } |
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65 |
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66 /* Free the mutex */ |
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67 void SDL_DestroyMutex(SDL_mutex *mutex) |
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68 { |
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69 if ( mutex ) { |
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70 if ( mutex->sem ) { |
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71 SDL_DestroySemaphore(mutex->sem); |
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72 } |
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73 free(mutex); |
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74 } |
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75 } |
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76 |
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77 /* Lock the semaphore */ |
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78 int SDL_mutexP(SDL_mutex *mutex) |
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79 { |
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80 #ifdef DISABLE_THREADS |
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81 return 0; |
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82 #else |
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83 Uint32 this_thread; |
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84 |
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85 if ( mutex == NULL ) { |
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86 SDL_SetError("Passed a NULL mutex"); |
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87 return -1; |
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88 } |
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89 |
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90 this_thread = SDL_ThreadID(); |
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91 if ( mutex->owner == this_thread ) { |
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92 ++mutex->recursive; |
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93 } else { |
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94 /* The order of operations is important. |
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95 We set the locking thread id after we obtain the lock |
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96 so unlocks from other threads will fail. |
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97 */ |
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98 SDL_SemWait(mutex->sem); |
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99 mutex->owner = this_thread; |
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100 mutex->recursive = 0; |
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101 } |
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102 |
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103 return 0; |
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104 #endif /* DISABLE_THREADS */ |
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105 } |
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106 |
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107 /* Unlock the mutex */ |
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108 int SDL_mutexV(SDL_mutex *mutex) |
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109 { |
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110 #ifdef DISABLE_THREADS |
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111 return 0; |
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112 #else |
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113 if ( mutex == NULL ) { |
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114 SDL_SetError("Passed a NULL mutex"); |
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115 return -1; |
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116 } |
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117 |
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118 /* If we don't own the mutex, we can't unlock it */ |
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119 if ( SDL_ThreadID() != mutex->owner ) { |
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120 SDL_SetError("mutex not owned by this thread"); |
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121 return -1; |
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122 } |
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123 |
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124 if ( mutex->recursive ) { |
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125 --mutex->recursive; |
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126 } else { |
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127 /* The order of operations is important. |
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128 First reset the owner so another thread doesn't lock |
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129 the mutex and set the ownership before we reset it, |
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130 then release the lock semaphore. |
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131 */ |
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132 mutex->owner = 0; |
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133 SDL_SemPost(mutex->sem); |
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134 } |
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135 return 0; |
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136 #endif /* DISABLE_THREADS */ |
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137 } |