Mercurial > sdl-ios-xcode
annotate src/thread/os2/SDL_sysmutex.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 06 Feb 2006 08:28:51 +0000 |
| parents | c9b51268668f |
| children | 3692456e7b0f |
| rev | line source |
|---|---|
| 1190 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 1190 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 1190 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
8 version 2.1 of the License, or (at your option) any later version. |
| 1190 | 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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
13 Lesser General Public License for more details. |
| 1190 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 1190 | 18 |
| 19 Sam Lantinga | |
| 20 slouken@libsdl.org | |
| 21 */ | |
| 22 | |
| 23 /* Mutex functions using the OS/2 API */ | |
| 24 | |
| 25 #include <stdio.h> | |
| 26 #include <stdlib.h> | |
| 27 #define INCL_DOSERRORS | |
| 28 #define INCL_DOSSEMAPHORES | |
| 29 #include <os2.h> | |
| 30 | |
| 31 #include "SDL_error.h" | |
| 32 #include "SDL_mutex.h" | |
| 33 | |
| 34 | |
| 35 struct SDL_mutex { | |
| 36 HMTX hmtxID; | |
| 37 }; | |
| 38 | |
| 39 /* Create a mutex */ | |
| 40 DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void) | |
| 41 { | |
| 42 SDL_mutex *mutex; | |
| 43 APIRET ulrc; | |
| 44 | |
| 45 /* Allocate mutex memory */ | |
| 46 mutex = (SDL_mutex *)malloc(sizeof(*mutex)); | |
| 47 if (mutex) | |
| 48 { | |
| 49 /* Create the mutex, with initial value signaled */ | |
| 50 ulrc = DosCreateMutexSem(NULL, // Create unnamed semaphore | |
| 51 &(mutex->hmtxID), // Pointer to handle | |
| 52 0L, // Flags: create it private (not shared) | |
| 53 FALSE); // Initial value: unowned | |
| 54 if (ulrc!=NO_ERROR) | |
| 55 { | |
| 56 SDL_SetError("Couldn't create mutex"); | |
| 57 free(mutex); | |
| 58 mutex = NULL; | |
| 59 } | |
| 60 } else { | |
| 61 SDL_OutOfMemory(); | |
| 62 } | |
| 63 return(mutex); | |
| 64 } | |
| 65 | |
| 66 /* Free the mutex */ | |
| 67 DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex) | |
| 68 { | |
| 69 if ( mutex ) | |
| 70 { | |
| 71 if ( mutex->hmtxID ) | |
| 72 { | |
| 73 DosCloseMutexSem(mutex->hmtxID); | |
| 74 mutex->hmtxID = 0; | |
| 75 } | |
| 76 free(mutex); | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 /* Lock the mutex */ | |
| 81 DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex) | |
| 82 { | |
| 83 if ( mutex == NULL ) | |
| 84 { | |
| 85 SDL_SetError("Passed a NULL mutex"); | |
| 86 return -1; | |
| 87 } | |
| 88 if ( DosRequestMutexSem(mutex->hmtxID, SEM_INDEFINITE_WAIT) != NO_ERROR ) | |
| 89 { | |
| 90 SDL_SetError("Couldn't wait on mutex"); | |
| 91 return -1; | |
| 92 } | |
| 93 return(0); | |
| 94 } | |
| 95 | |
| 96 /* Unlock the mutex */ | |
| 97 DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex) | |
| 98 { | |
| 99 if ( mutex == NULL ) | |
| 100 { | |
| 101 SDL_SetError("Passed a NULL mutex"); | |
| 102 return -1; | |
| 103 } | |
| 104 if ( DosReleaseMutexSem(mutex->hmtxID) != NO_ERROR ) | |
| 105 { | |
| 106 SDL_SetError("Couldn't release mutex"); | |
| 107 return -1; | |
| 108 } | |
| 109 return(0); | |
| 110 } |