Mercurial > sdl-ios-xcode
annotate src/thread/dc/SDL_sysmutex.c @ 1358:c71e05b4dc2e
More header massaging... works great on Windows. ;-)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 10 Feb 2006 06:48:43 +0000 |
parents | 604d73db6802 |
children | 19418e4422cb |
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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 #ifdef DISABLE_THREADS |
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65 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 /* DISABLE_THREADS */ |
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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 #ifdef DISABLE_THREADS |
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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 /* DISABLE_THREADS */ |
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121 } |