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annotate src/thread/win32/SDL_syssem.c @ 1066:671bbd773c8a
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| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Thu, 02 Jun 2005 22:02:18 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Semaphore functions using the Win32 API */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <windows.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_thread.h" | |
| 36 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) | |
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37 #include "win_ce_semaphore.h" |
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38 #endif |
| 0 | 39 |
| 40 | |
| 41 struct SDL_semaphore { | |
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42 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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43 SYNCHHANDLE id; |
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44 #else |
| 0 | 45 HANDLE id; |
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46 #endif |
| 0 | 47 Uint32 volatile count; |
| 48 }; | |
| 49 | |
| 50 | |
| 51 /* Create a semaphore */ | |
| 52 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 53 { | |
| 54 SDL_sem *sem; | |
| 55 | |
| 56 /* Allocate sem memory */ | |
| 57 sem = (SDL_sem *)malloc(sizeof(*sem)); | |
| 58 if ( sem ) { | |
| 59 /* Create the semaphore, with max value 32K */ | |
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60 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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61 sem->id = CreateSemaphoreCE(NULL, initial_value, 32*1024, NULL); |
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62 #else |
| 0 | 63 sem->id = CreateSemaphore(NULL, initial_value, 32*1024, NULL); |
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64 #endif |
| 0 | 65 sem->count = initial_value; |
| 66 if ( ! sem->id ) { | |
| 67 SDL_SetError("Couldn't create semaphore"); | |
| 68 free(sem); | |
| 69 sem = NULL; | |
| 70 } | |
| 71 } else { | |
| 72 SDL_OutOfMemory(); | |
| 73 } | |
| 74 return(sem); | |
| 75 } | |
| 76 | |
| 77 /* Free the semaphore */ | |
| 78 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 79 { | |
| 80 if ( sem ) { | |
| 81 if ( sem->id ) { | |
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82 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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83 CloseSynchHandle(sem->id); |
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84 #else |
| 0 | 85 CloseHandle(sem->id); |
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86 #endif |
| 0 | 87 sem->id = 0; |
| 88 } | |
| 89 free(sem); | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 94 { | |
| 95 int retval; | |
| 96 DWORD dwMilliseconds; | |
| 97 | |
| 98 if ( ! sem ) { | |
| 99 SDL_SetError("Passed a NULL sem"); | |
| 100 return -1; | |
| 101 } | |
| 102 | |
| 103 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 104 dwMilliseconds = INFINITE; | |
| 105 } else { | |
| 106 dwMilliseconds = (DWORD)timeout; | |
| 107 } | |
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108 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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109 switch (WaitForSemaphoreCE(sem->id, dwMilliseconds)) { |
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110 #else |
| 0 | 111 switch (WaitForSingleObject(sem->id, dwMilliseconds)) { |
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112 #endif |
| 0 | 113 case WAIT_OBJECT_0: |
| 114 --sem->count; | |
| 115 retval = 0; | |
| 116 break; | |
| 117 case WAIT_TIMEOUT: | |
| 118 retval = SDL_MUTEX_TIMEDOUT; | |
| 119 break; | |
| 120 default: | |
| 121 SDL_SetError("WaitForSingleObject() failed"); | |
| 122 retval = -1; | |
| 123 break; | |
| 124 } | |
| 125 return retval; | |
| 126 } | |
| 127 | |
| 128 int SDL_SemTryWait(SDL_sem *sem) | |
| 129 { | |
| 130 return SDL_SemWaitTimeout(sem, 0); | |
| 131 } | |
| 132 | |
| 133 int SDL_SemWait(SDL_sem *sem) | |
| 134 { | |
| 135 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 136 } | |
| 137 | |
| 138 /* Returns the current count of the semaphore */ | |
| 139 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 140 { | |
| 141 if ( ! sem ) { | |
| 142 SDL_SetError("Passed a NULL sem"); | |
| 143 return 0; | |
| 144 } | |
| 145 return sem->count; | |
| 146 } | |
| 147 | |
| 148 int SDL_SemPost(SDL_sem *sem) | |
| 149 { | |
| 150 if ( ! sem ) { | |
| 151 SDL_SetError("Passed a NULL sem"); | |
| 152 return -1; | |
| 153 } | |
| 154 /* Increase the counter in the first place, because | |
| 155 * after a successful release the semaphore may | |
| 156 * immediately get destroyed by another thread which | |
| 157 * is waiting for this semaphore. | |
| 158 */ | |
| 159 ++sem->count; | |
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160 #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
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161 if ( ReleaseSemaphoreCE(sem->id, 1, NULL) == FALSE ) { |
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162 #else |
| 0 | 163 if ( ReleaseSemaphore(sem->id, 1, NULL) == FALSE ) { |
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164 #endif |
| 0 | 165 --sem->count; /* restore */ |
| 166 SDL_SetError("ReleaseSemaphore() failed"); | |
| 167 return -1; | |
| 168 } | |
| 169 return 0; | |
| 170 } |