Mercurial > sdl-ios-xcode
annotate src/thread/generic/SDL_sysmutex.c @ 3468:789b97008d8a
My first OpenGL shader! Momma will be so proud!
This shader implements the software renderer mask semantics where the source pixel is multiplied by the color and alpha modulation values and then any pixel with non-zero alpha is fully opaque.
The OpenGL renderer on Mac OS X now passes all the automated render tests! :)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 21 Nov 2009 05:29:31 +0000 |
parents | 99210400e8b9 |
children | 0d1b16ee0bca |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
2859 | 3 Copyright (C) 1997-2009 Sam Lantinga |
0 | 4 |
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 |
0 | 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. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 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 |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* An implementation of mutexes using semaphores */ | |
25 | |
26 #include "SDL_thread.h" | |
27 #include "SDL_systhread_c.h" | |
28 | |
29 | |
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30 struct SDL_mutex |
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31 { |
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32 int recursive; |
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33 Uint32 owner; |
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34 SDL_sem *sem; |
0 | 35 }; |
36 | |
37 /* Create a mutex */ | |
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38 SDL_mutex * |
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39 SDL_CreateMutex(void) |
0 | 40 { |
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41 SDL_mutex *mutex; |
0 | 42 |
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43 /* Allocate mutex memory */ |
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44 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex)); |
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45 if (mutex) { |
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46 /* Create the mutex semaphore, with initial value 1 */ |
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47 mutex->sem = SDL_CreateSemaphore(1); |
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48 mutex->recursive = 0; |
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49 mutex->owner = 0; |
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50 if (!mutex->sem) { |
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51 SDL_free(mutex); |
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52 mutex = NULL; |
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53 } |
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54 } else { |
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55 SDL_OutOfMemory(); |
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56 } |
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57 return mutex; |
0 | 58 } |
59 | |
60 /* Free the mutex */ | |
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61 void |
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62 SDL_DestroyMutex(SDL_mutex * mutex) |
0 | 63 { |
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64 if (mutex) { |
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65 if (mutex->sem) { |
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66 SDL_DestroySemaphore(mutex->sem); |
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67 } |
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68 SDL_free(mutex); |
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69 } |
0 | 70 } |
71 | |
72 /* Lock the semaphore */ | |
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73 int |
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74 SDL_mutexP(SDL_mutex * mutex) |
0 | 75 { |
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76 #if SDL_THREADS_DISABLED |
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77 return 0; |
0 | 78 #else |
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79 Uint32 this_thread; |
0 | 80 |
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81 if (mutex == NULL) { |
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82 SDL_SetError("Passed a NULL mutex"); |
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83 return -1; |
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84 } |
0 | 85 |
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86 this_thread = SDL_ThreadID(); |
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87 if (mutex->owner == this_thread) { |
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88 ++mutex->recursive; |
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89 } else { |
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90 /* The order of operations is important. |
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91 We set the locking thread id after we obtain the lock |
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92 so unlocks from other threads will fail. |
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93 */ |
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94 SDL_SemWait(mutex->sem); |
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95 mutex->owner = this_thread; |
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96 mutex->recursive = 0; |
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97 } |
0 | 98 |
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99 return 0; |
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100 #endif /* SDL_THREADS_DISABLED */ |
0 | 101 } |
102 | |
103 /* Unlock the mutex */ | |
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104 int |
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105 SDL_mutexV(SDL_mutex * mutex) |
0 | 106 { |
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107 #if SDL_THREADS_DISABLED |
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108 return 0; |
0 | 109 #else |
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110 if (mutex == NULL) { |
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111 SDL_SetError("Passed a NULL mutex"); |
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112 return -1; |
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113 } |
0 | 114 |
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115 /* If we don't own the mutex, we can't unlock it */ |
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116 if (SDL_ThreadID() != mutex->owner) { |
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117 SDL_SetError("mutex not owned by this thread"); |
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118 return -1; |
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119 } |
0 | 120 |
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121 if (mutex->recursive) { |
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122 --mutex->recursive; |
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123 } else { |
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124 /* The order of operations is important. |
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125 First reset the owner so another thread doesn't lock |
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126 the mutex and set the ownership before we reset it, |
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127 then release the lock semaphore. |
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128 */ |
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129 mutex->owner = 0; |
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130 SDL_SemPost(mutex->sem); |
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131 } |
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132 return 0; |
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133 #endif /* SDL_THREADS_DISABLED */ |
0 | 134 } |
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135 |
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136 /* vi: set ts=4 sw=4 expandtab: */ |