Mercurial > sdl-ios-xcode
annotate src/thread/win32/SDL_syssem.c @ 3984:b74530a1dad6 SDL-1.2
Better fix for bug 419
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 28 Jun 2007 05:35:50 +0000 |
| parents | bb6839704ed6 |
| children | 782fd950bd46 c121d94672cb 84882a89ca50 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 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 /* Semaphore functions using the Win32 API */ | |
| 25 | |
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26 #define WIN32_LEAN_AND_MEAN |
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27 #include <windows.h> |
| 0 | 28 |
| 29 #include "SDL_thread.h" | |
| 30 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | |
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31 #include "win_ce_semaphore.h" |
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32 #endif |
| 0 | 33 |
| 34 | |
| 35 struct SDL_semaphore { | |
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36 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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37 SYNCHHANDLE id; |
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38 #else |
| 0 | 39 HANDLE id; |
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40 #endif |
| 0 | 41 Uint32 volatile count; |
| 42 }; | |
| 43 | |
| 44 | |
| 45 /* Create a semaphore */ | |
| 46 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 47 { | |
| 48 SDL_sem *sem; | |
| 49 | |
| 50 /* Allocate sem memory */ | |
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51 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
| 0 | 52 if ( sem ) { |
| 53 /* Create the semaphore, with max value 32K */ | |
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54 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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55 sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL); |
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56 #else |
| 0 | 57 sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL); |
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58 #endif |
| 0 | 59 sem->count = initial_value; |
| 60 if ( ! sem->id ) { | |
| 61 SDL_SetError("Couldn't create semaphore"); | |
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62 SDL_free(sem); |
| 0 | 63 sem = NULL; |
| 64 } | |
| 65 } else { | |
| 66 SDL_OutOfMemory(); | |
| 67 } | |
| 68 return(sem); | |
| 69 } | |
| 70 | |
| 71 /* Free the semaphore */ | |
| 72 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 73 { | |
| 74 if ( sem ) { | |
| 75 if ( sem->id ) { | |
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76 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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77 CloseSynchHandle(sem->id); |
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78 #else |
| 0 | 79 CloseHandle(sem->id); |
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80 #endif |
| 0 | 81 sem->id = 0; |
| 82 } | |
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83 SDL_free(sem); |
| 0 | 84 } |
| 85 } | |
| 86 | |
| 87 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 88 { | |
| 89 int retval; | |
| 90 DWORD dwMilliseconds; | |
| 91 | |
| 92 if ( ! sem ) { | |
| 93 SDL_SetError("Passed a NULL sem"); | |
| 94 return -1; | |
| 95 } | |
| 96 | |
| 97 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 98 dwMilliseconds = INFINITE; | |
| 99 } else { | |
| 100 dwMilliseconds = (DWORD)timeout; | |
| 101 } | |
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102 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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103 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) { |
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104 #else |
| 0 | 105 switch (WaitForSingleObject(sem->id, dwMilliseconds)) { |
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106 #endif |
| 0 | 107 case WAIT_OBJECT_0: |
| 108 --sem->count; | |
| 109 retval = 0; | |
| 110 break; | |
| 111 case WAIT_TIMEOUT: | |
| 112 retval = SDL_MUTEX_TIMEDOUT; | |
| 113 break; | |
| 114 default: | |
| 115 SDL_SetError("WaitForSingleObject() failed"); | |
| 116 retval = -1; | |
| 117 break; | |
| 118 } | |
| 119 return retval; | |
| 120 } | |
| 121 | |
| 122 int SDL_SemTryWait(SDL_sem *sem) | |
| 123 { | |
| 124 return SDL_SemWaitTimeout(sem, 0); | |
| 125 } | |
| 126 | |
| 127 int SDL_SemWait(SDL_sem *sem) | |
| 128 { | |
| 129 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 130 } | |
| 131 | |
| 132 /* Returns the current count of the semaphore */ | |
| 133 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 134 { | |
| 135 if ( ! sem ) { | |
| 136 SDL_SetError("Passed a NULL sem"); | |
| 137 return 0; | |
| 138 } | |
| 139 return sem->count; | |
| 140 } | |
| 141 | |
| 142 int SDL_SemPost(SDL_sem *sem) | |
| 143 { | |
| 144 if ( ! sem ) { | |
| 145 SDL_SetError("Passed a NULL sem"); | |
| 146 return -1; | |
| 147 } | |
| 148 /* Increase the counter in the first place, because | |
| 149 * after a successful release the semaphore may | |
| 150 * immediately get destroyed by another thread which | |
| 151 * is waiting for this semaphore. | |
| 152 */ | |
| 153 ++sem->count; | |
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154 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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155 if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) { |
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156 #else |
| 0 | 157 if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) { |
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158 #endif |
| 0 | 159 --sem->count; /* restore */ |
| 160 SDL_SetError("ReleaseSemaphore() failed"); | |
| 161 return -1; | |
| 162 } | |
| 163 return 0; | |
| 164 } |