Mercurial > sdl-ios-xcode
annotate src/thread/win32/SDL_syssem.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | b8d311d90021 |
| children | 450721ad5436 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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1312
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Sam Lantinga <slouken@libsdl.org>
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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 | |
| 25 #include <stdio.h> | |
| 26 #include <stdlib.h> | |
| 27 #include <windows.h> | |
| 28 | |
| 29 #include "SDL_error.h" | |
| 30 #include "SDL_thread.h" | |
| 31 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | |
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32 #include "win_ce_semaphore.h" |
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33 #endif |
| 0 | 34 |
| 35 | |
| 36 struct SDL_semaphore { | |
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37 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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38 SYNCHHANDLE id; |
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39 #else |
| 0 | 40 HANDLE id; |
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41 #endif |
| 0 | 42 Uint32 volatile count; |
| 43 }; | |
| 44 | |
| 45 | |
| 46 /* Create a semaphore */ | |
| 47 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 48 { | |
| 49 SDL_sem *sem; | |
| 50 | |
| 51 /* Allocate sem memory */ | |
| 52 sem = (SDL_sem *)malloc(sizeof(*sem)); | |
| 53 if ( sem ) { | |
| 54 /* Create the semaphore, with max value 32K */ | |
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55 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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56 sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL); |
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57 #else |
| 0 | 58 sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL); |
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59 #endif |
| 0 | 60 sem->count = initial_value; |
| 61 if ( ! sem->id ) { | |
| 62 SDL_SetError("Couldn't create semaphore"); | |
| 63 free(sem); | |
| 64 sem = NULL; | |
| 65 } | |
| 66 } else { | |
| 67 SDL_OutOfMemory(); | |
| 68 } | |
| 69 return(sem); | |
| 70 } | |
| 71 | |
| 72 /* Free the semaphore */ | |
| 73 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 74 { | |
| 75 if ( sem ) { | |
| 76 if ( sem->id ) { | |
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77 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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78 CloseSynchHandle(sem->id); |
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79 #else |
| 0 | 80 CloseHandle(sem->id); |
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81 #endif |
| 0 | 82 sem->id = 0; |
| 83 } | |
| 84 free(sem); | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 89 { | |
| 90 int retval; | |
| 91 DWORD dwMilliseconds; | |
| 92 | |
| 93 if ( ! sem ) { | |
| 94 SDL_SetError("Passed a NULL sem"); | |
| 95 return -1; | |
| 96 } | |
| 97 | |
| 98 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 99 dwMilliseconds = INFINITE; | |
| 100 } else { | |
| 101 dwMilliseconds = (DWORD)timeout; | |
| 102 } | |
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103 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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104 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) { |
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105 #else |
| 0 | 106 switch (WaitForSingleObject(sem->id, dwMilliseconds)) { |
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107 #endif |
| 0 | 108 case WAIT_OBJECT_0: |
| 109 --sem->count; | |
| 110 retval = 0; | |
| 111 break; | |
| 112 case WAIT_TIMEOUT: | |
| 113 retval = SDL_MUTEX_TIMEDOUT; | |
| 114 break; | |
| 115 default: | |
| 116 SDL_SetError("WaitForSingleObject() failed"); | |
| 117 retval = -1; | |
| 118 break; | |
| 119 } | |
| 120 return retval; | |
| 121 } | |
| 122 | |
| 123 int SDL_SemTryWait(SDL_sem *sem) | |
| 124 { | |
| 125 return SDL_SemWaitTimeout(sem, 0); | |
| 126 } | |
| 127 | |
| 128 int SDL_SemWait(SDL_sem *sem) | |
| 129 { | |
| 130 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 131 } | |
| 132 | |
| 133 /* Returns the current count of the semaphore */ | |
| 134 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 135 { | |
| 136 if ( ! sem ) { | |
| 137 SDL_SetError("Passed a NULL sem"); | |
| 138 return 0; | |
| 139 } | |
| 140 return sem->count; | |
| 141 } | |
| 142 | |
| 143 int SDL_SemPost(SDL_sem *sem) | |
| 144 { | |
| 145 if ( ! sem ) { | |
| 146 SDL_SetError("Passed a NULL sem"); | |
| 147 return -1; | |
| 148 } | |
| 149 /* Increase the counter in the first place, because | |
| 150 * after a successful release the semaphore may | |
| 151 * immediately get destroyed by another thread which | |
| 152 * is waiting for this semaphore. | |
| 153 */ | |
| 154 ++sem->count; | |
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155 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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156 if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) { |
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157 #else |
| 0 | 158 if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) { |
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159 #endif |
| 0 | 160 --sem->count; /* restore */ |
| 161 SDL_SetError("ReleaseSemaphore() failed"); | |
| 162 return -1; | |
| 163 } | |
| 164 return 0; | |
| 165 } |