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annotate src/thread/os2/SDL_sysmutex.c @ 3164:c5b2884c26b4

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Added an ifdef so that if you #define SDL_NO_COMPAT before you include SDL.h then SDL_compat.h will never be included in your code. This is useful for making sure that your code uses only SDL 1.3 features. It is also handy for finding things that are in SDL_compat.h that belong elsewhere.
author Bob Pendleton <bob@pendleton.com>
date Thu, 04 Jun 2009 21:00:45 +0000
parents 99210400e8b9
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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: */