Mercurial > sdl-ios-xcode
annotate src/thread/os2/SDL_sysmutex.c @ 1899:6a11e61bf805
debug cleanup
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 12 Jul 2006 08:09:57 +0000 |
parents | c121d94672cb |
children | 99210400e8b9 |
rev | line source |
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1190 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
1190 | 4 |
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 |
1190 | 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. |
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 | |
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13 Lesser General Public License for more details. |
1190 | 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 |
1190 | 18 |
19 Sam Lantinga | |
20 slouken@libsdl.org | |
21 */ | |
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22 #include "SDL_config.h" |
1190 | 23 |
24 /* Mutex functions using the OS/2 API */ | |
25 | |
26 #define INCL_DOSERRORS | |
27 #define INCL_DOSSEMAPHORES | |
28 #include <os2.h> | |
29 | |
30 #include "SDL_mutex.h" | |
31 | |
32 | |
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33 struct SDL_mutex |
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34 { |
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35 HMTX hmtxID; |
1190 | 36 }; |
37 | |
38 /* Create a mutex */ | |
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39 DECLSPEC SDL_mutex *SDLCALL |
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40 SDL_CreateMutex(void) |
1190 | 41 { |
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42 SDL_mutex *mutex; |
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43 APIRET ulrc; |
1190 | 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(); |
1190 | 60 } |
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61 return (mutex); |
1190 | 62 } |
63 | |
64 /* Free the mutex */ | |
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65 DECLSPEC void SDLCALL |
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66 SDL_DestroyMutex(SDL_mutex * mutex) |
1190 | 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); |
1190 | 74 } |
75 } | |
76 | |
77 /* Lock the mutex */ | |
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78 DECLSPEC int SDLCALL |
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79 SDL_mutexP(SDL_mutex * mutex) |
1190 | 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); |
1190 | 90 } |
91 | |
92 /* Unlock the mutex */ | |
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93 DECLSPEC int SDLCALL |
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94 SDL_mutexV(SDL_mutex * mutex) |
1190 | 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); |
1190 | 105 } |
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106 |
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107 /* vi: set ts=4 sw=4 expandtab: */ |