Mercurial > sdl-ios-xcode
annotate src/thread/win32/SDL_sysmutex.c @ 1204:f9794ee91dfc
Date: Tue, 13 Dec 2005 13:33:50 +0000
From: "alan buckley"
Subject: Patch to fix audio locking on RISC OS
When threads were not disabled on a RISC OS build
the audio mixer mutex was not created.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 13 Dec 2005 16:40:12 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
769
b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
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 | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Mutex 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_mutex.h" | |
| 36 | |
| 37 | |
| 38 struct SDL_mutex { | |
| 39 HANDLE id; | |
| 40 }; | |
| 41 | |
| 42 /* Create a mutex */ | |
| 43 SDL_mutex *SDL_CreateMutex(void) | |
| 44 { | |
| 45 SDL_mutex *mutex; | |
| 46 | |
| 47 /* Allocate mutex memory */ | |
| 48 mutex = (SDL_mutex *)malloc(sizeof(*mutex)); | |
| 49 if ( mutex ) { | |
| 50 /* Create the mutex, with initial value signaled */ | |
| 51 mutex->id = CreateMutex(NULL, FALSE, NULL); | |
| 52 if ( ! mutex->id ) { | |
| 53 SDL_SetError("Couldn't create mutex"); | |
| 54 free(mutex); | |
| 55 mutex = NULL; | |
| 56 } | |
| 57 } else { | |
| 58 SDL_OutOfMemory(); | |
| 59 } | |
| 60 return(mutex); | |
| 61 } | |
| 62 | |
| 63 /* Free the mutex */ | |
| 64 void SDL_DestroyMutex(SDL_mutex *mutex) | |
| 65 { | |
| 66 if ( mutex ) { | |
| 67 if ( mutex->id ) { | |
| 68 CloseHandle(mutex->id); | |
| 69 mutex->id = 0; | |
| 70 } | |
| 71 free(mutex); | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 /* Lock the mutex */ | |
| 76 int SDL_mutexP(SDL_mutex *mutex) | |
| 77 { | |
| 78 if ( mutex == NULL ) { | |
| 79 SDL_SetError("Passed a NULL mutex"); | |
| 80 return -1; | |
| 81 } | |
| 82 if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) { | |
| 83 SDL_SetError("Couldn't wait on mutex"); | |
| 84 return -1; | |
| 85 } | |
| 86 return(0); | |
| 87 } | |
| 88 | |
| 89 /* Unlock the mutex */ | |
| 90 int SDL_mutexV(SDL_mutex *mutex) | |
| 91 { | |
| 92 if ( mutex == NULL ) { | |
| 93 SDL_SetError("Passed a NULL mutex"); | |
| 94 return -1; | |
| 95 } | |
| 96 if ( ReleaseMutex(mutex->id) == FALSE ) { | |
| 97 SDL_SetError("Couldn't release mutex"); | |
| 98 return -1; | |
| 99 } | |
| 100 return(0); | |
| 101 } |