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comparison src/thread/os2/SDL_sysmutex.c @ 1190:173c063d4f55

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OS/2 port! This was mostly, if not entirely, written by "Doodle" and "Caetano": doodle@scenergy.dfmk.hu daniel@caetano.eng.br --ryan.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 23 Nov 2005 07:29:56 +0000
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children c9b51268668f
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1189:c96b326b90ba 1190:173c063d4f55
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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
20 slouken@libsdl.org
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id$";
26 #endif
27
28 /* Mutex functions using the OS/2 API */
29
30 #include <stdio.h>
31 #include <stdlib.h>
32 #define INCL_DOSERRORS
33 #define INCL_DOSSEMAPHORES
34 #include <os2.h>
35
36 #include "SDL_error.h"
37 #include "SDL_mutex.h"
38
39
40 struct SDL_mutex {
41 HMTX hmtxID;
42 };
43
44 /* Create a mutex */
45 DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void)
46 {
47 SDL_mutex *mutex;
48 APIRET ulrc;
49
50 /* Allocate mutex memory */
51 mutex = (SDL_mutex *)malloc(sizeof(*mutex));
52 if (mutex)
53 {
54 /* Create the mutex, with initial value signaled */
55 ulrc = DosCreateMutexSem(NULL, // Create unnamed semaphore
56 &(mutex->hmtxID), // Pointer to handle
57 0L, // Flags: create it private (not shared)
58 FALSE); // Initial value: unowned
59 if (ulrc!=NO_ERROR)
60 {
61 SDL_SetError("Couldn't create mutex");
62 free(mutex);
63 mutex = NULL;
64 }
65 } else {
66 SDL_OutOfMemory();
67 }
68 return(mutex);
69 }
70
71 /* Free the mutex */
72 DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex)
73 {
74 if ( mutex )
75 {
76 if ( mutex->hmtxID )
77 {
78 DosCloseMutexSem(mutex->hmtxID);
79 mutex->hmtxID = 0;
80 }
81 free(mutex);
82 }
83 }
84
85 /* Lock the mutex */
86 DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex)
87 {
88 if ( mutex == NULL )
89 {
90 SDL_SetError("Passed a NULL mutex");
91 return -1;
92 }
93 if ( DosRequestMutexSem(mutex->hmtxID, SEM_INDEFINITE_WAIT) != NO_ERROR )
94 {
95 SDL_SetError("Couldn't wait on mutex");
96 return -1;
97 }
98 return(0);
99 }
100
101 /* Unlock the mutex */
102 DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex)
103 {
104 if ( mutex == NULL )
105 {
106 SDL_SetError("Passed a NULL mutex");
107 return -1;
108 }
109 if ( DosReleaseMutexSem(mutex->hmtxID) != NO_ERROR )
110 {
111 SDL_SetError("Couldn't release mutex");
112 return -1;
113 }
114 return(0);
115 }