Mercurial > sdl-ios-xcode
annotate src/thread/win32/SDL_syssem.c @ 1386:2b7e0180a72c
Pick the right default GL library on IRIX
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Feb 2006 10:19:22 +0000 |
| parents | c71e05b4dc2e |
| children | d910939febfa |
| 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 */ |
| 22 | |
| 23 /* Semaphore functions using the Win32 API */ | |
| 24 | |
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25 #include "SDL_windows.h" |
| 0 | 26 |
| 27 #include "SDL_thread.h" | |
| 28 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | |
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29 #include "win_ce_semaphore.h" |
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30 #endif |
| 0 | 31 |
| 32 | |
| 33 struct SDL_semaphore { | |
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34 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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35 SYNCHHANDLE id; |
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36 #else |
| 0 | 37 HANDLE id; |
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38 #endif |
| 0 | 39 Uint32 volatile count; |
| 40 }; | |
| 41 | |
| 42 | |
| 43 /* Create a semaphore */ | |
| 44 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 45 { | |
| 46 SDL_sem *sem; | |
| 47 | |
| 48 /* Allocate sem memory */ | |
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49 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
| 0 | 50 if ( sem ) { |
| 51 /* Create the semaphore, with max value 32K */ | |
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52 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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53 sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL); |
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54 #else |
| 0 | 55 sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL); |
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56 #endif |
| 0 | 57 sem->count = initial_value; |
| 58 if ( ! sem->id ) { | |
| 59 SDL_SetError("Couldn't create semaphore"); | |
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60 SDL_free(sem); |
| 0 | 61 sem = NULL; |
| 62 } | |
| 63 } else { | |
| 64 SDL_OutOfMemory(); | |
| 65 } | |
| 66 return(sem); | |
| 67 } | |
| 68 | |
| 69 /* Free the semaphore */ | |
| 70 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 71 { | |
| 72 if ( sem ) { | |
| 73 if ( sem->id ) { | |
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74 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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75 CloseSynchHandle(sem->id); |
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76 #else |
| 0 | 77 CloseHandle(sem->id); |
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78 #endif |
| 0 | 79 sem->id = 0; |
| 80 } | |
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81 SDL_free(sem); |
| 0 | 82 } |
| 83 } | |
| 84 | |
| 85 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 86 { | |
| 87 int retval; | |
| 88 DWORD dwMilliseconds; | |
| 89 | |
| 90 if ( ! sem ) { | |
| 91 SDL_SetError("Passed a NULL sem"); | |
| 92 return -1; | |
| 93 } | |
| 94 | |
| 95 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 96 dwMilliseconds = INFINITE; | |
| 97 } else { | |
| 98 dwMilliseconds = (DWORD)timeout; | |
| 99 } | |
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100 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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101 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) { |
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102 #else |
| 0 | 103 switch (WaitForSingleObject(sem->id, dwMilliseconds)) { |
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104 #endif |
| 0 | 105 case WAIT_OBJECT_0: |
| 106 --sem->count; | |
| 107 retval = 0; | |
| 108 break; | |
| 109 case WAIT_TIMEOUT: | |
| 110 retval = SDL_MUTEX_TIMEDOUT; | |
| 111 break; | |
| 112 default: | |
| 113 SDL_SetError("WaitForSingleObject() failed"); | |
| 114 retval = -1; | |
| 115 break; | |
| 116 } | |
| 117 return retval; | |
| 118 } | |
| 119 | |
| 120 int SDL_SemTryWait(SDL_sem *sem) | |
| 121 { | |
| 122 return SDL_SemWaitTimeout(sem, 0); | |
| 123 } | |
| 124 | |
| 125 int SDL_SemWait(SDL_sem *sem) | |
| 126 { | |
| 127 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 128 } | |
| 129 | |
| 130 /* Returns the current count of the semaphore */ | |
| 131 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 132 { | |
| 133 if ( ! sem ) { | |
| 134 SDL_SetError("Passed a NULL sem"); | |
| 135 return 0; | |
| 136 } | |
| 137 return sem->count; | |
| 138 } | |
| 139 | |
| 140 int SDL_SemPost(SDL_sem *sem) | |
| 141 { | |
| 142 if ( ! sem ) { | |
| 143 SDL_SetError("Passed a NULL sem"); | |
| 144 return -1; | |
| 145 } | |
| 146 /* Increase the counter in the first place, because | |
| 147 * after a successful release the semaphore may | |
| 148 * immediately get destroyed by another thread which | |
| 149 * is waiting for this semaphore. | |
| 150 */ | |
| 151 ++sem->count; | |
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152 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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153 if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) { |
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154 #else |
| 0 | 155 if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) { |
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156 #endif |
| 0 | 157 --sem->count; /* restore */ |
| 158 SDL_SetError("ReleaseSemaphore() failed"); | |
| 159 return -1; | |
| 160 } | |
| 161 return 0; | |
| 162 } |