Mercurial > sdl-ios-xcode

annotate src/thread/os2/SDL_sysmutex.c @ 3846:66fb40445587 SDL-ryan-multiple-audio-device

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Removed distinction between "available" and "init" in audio backends, since both had to be checked for success as a pair at the higher level and several of the Available methods were just always-succeed placeholders anyhow. Now the availability check is done in the init code, and the higher level tries all possible drivers until one manages to initialize successfully.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 09:09:21 +0000
parents c121d94672cb
children 99210400e8b9
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Mutex functions using the OS/2 API */
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25
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26 #define INCL_DOSERRORS
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27 #define INCL_DOSSEMAPHORES
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28 #include <os2.h>
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29
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30 #include "SDL_mutex.h"
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31
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32
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33 struct SDL_mutex
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34 {
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35 HMTX hmtxID;
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36 };
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37
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38 /* Create a mutex */
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39 DECLSPEC SDL_mutex *SDLCALL
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40 SDL_CreateMutex(void)
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41 {
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42 SDL_mutex *mutex;
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43 APIRET ulrc;
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44
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45 /* Allocate mutex memory */
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46 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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47 if (mutex) {
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48 /* Create the mutex, with initial value signaled */
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49 ulrc = DosCreateMutexSem(NULL, // Create unnamed semaphore
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50 &(mutex->hmtxID), // Pointer to handle
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51 0L, // Flags: create it private (not shared)
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52 FALSE); // Initial value: unowned
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53 if (ulrc != NO_ERROR) {
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54 SDL_SetError("Couldn't create mutex");
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55 SDL_free(mutex);
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56 mutex = NULL;
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57 }
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58 } else {
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59 SDL_OutOfMemory();
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60 }
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61 return (mutex);
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62 }
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63
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64 /* Free the mutex */
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65 DECLSPEC void SDLCALL
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66 SDL_DestroyMutex(SDL_mutex * mutex)
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67 {
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68 if (mutex) {
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69 if (mutex->hmtxID) {
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70 DosCloseMutexSem(mutex->hmtxID);
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71 mutex->hmtxID = 0;
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72 }
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73 SDL_free(mutex);
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74 }
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75 }
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76
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77 /* Lock the mutex */
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78 DECLSPEC int SDLCALL
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79 SDL_mutexP(SDL_mutex * mutex)
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80 {
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81 if (mutex == NULL) {
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82 SDL_SetError("Passed a NULL mutex");
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83 return -1;
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84 }
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85 if (DosRequestMutexSem(mutex->hmtxID, SEM_INDEFINITE_WAIT) != NO_ERROR) {
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86 SDL_SetError("Couldn't wait on mutex");
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87 return -1;
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88 }
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89 return (0);
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90 }
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91
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92 /* Unlock the mutex */
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93 DECLSPEC int SDLCALL
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94 SDL_mutexV(SDL_mutex * mutex)
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95 {
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96 if (mutex == NULL) {
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97 SDL_SetError("Passed a NULL mutex");
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98 return -1;
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99 }
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100 if (DosReleaseMutexSem(mutex->hmtxID) != NO_ERROR) {
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101 SDL_SetError("Couldn't release mutex");
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102 return -1;
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103 }
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104 return (0);
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105 }
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106
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107 /* vi: set ts=4 sw=4 expandtab: */