|
1190
|
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 }
|
