Mercurial > sdl-ios-xcode
annotate src/thread/dc/SDL_sysmutex.c @ 937:1e6366bde299
Date: Tue, 27 Jul 2004 17:14:00 +0200
From: "Eckhard Stolberg"
Subject: Controller names in SDL for Windows
I'm working on an Atari 2600 emulator for different systems that uses
the SDL. Some time ago someone created an adaptor that lets you use
your old Atari controllers with your computer through the USB port.
Some of the Atari controllers require special handling by the emulator,
so it would be nice, if it would be possible to detect if any of the
controllers connected to the computer is this adaptor.
SDL would allow that with the SDL_JoystickName function, but unfortunately
it doesn't work properly on Windows. On Linux and MacOSX this function
returns the name of the controller, but on Windows you'll only get the
name of the joystick driver. Most joysticks nowadays use the generic
Microsoft driver, so they all return the same name.
In an old MSDN article
(http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarinput/html/msdn_extdirect.asp)
Microsoft describes how to read out the OEM controller names from the registry.
I have implemented this for the SDL controller handler on Windows,
and now reading the joystick name works properly there too.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 21 Aug 2004 03:45:58 +0000 |
parents | b8d311d90021 |
children | c9b51268668f |
rev | line source |
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509
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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509
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3 Copyright (C) 1997-2004 Sam Lantinga |
509
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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 Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 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 Library 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 Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 |
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19 BERO |
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20 bero@geocities.co.jp |
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21 |
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22 based on generic/SDL_sysmutex.c |
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23 |
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24 Sam Lantinga |
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25 slouken@libsdl.org |
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26 */ |
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27 |
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28 #ifdef SAVE_RCSID |
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29 static char rcsid = |
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30 "@(#) $Id$"; |
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31 #endif |
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32 |
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33 /* An implementation of mutexes using semaphores */ |
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34 |
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35 #include <stdio.h> |
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36 #include <stdlib.h> |
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37 |
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38 #include "SDL_error.h" |
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39 #include "SDL_thread.h" |
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40 #include "SDL_systhread_c.h" |
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41 |
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42 #include <arch/spinlock.h> |
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43 |
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44 struct SDL_mutex { |
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45 int recursive; |
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46 Uint32 owner; |
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47 spinlock_t mutex; |
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48 }; |
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49 |
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50 /* Create a mutex */ |
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51 SDL_mutex *SDL_CreateMutex(void) |
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52 { |
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53 SDL_mutex *mutex; |
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54 |
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55 /* Allocate mutex memory */ |
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56 mutex = (SDL_mutex *)malloc(sizeof(*mutex)); |
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57 if ( mutex ) { |
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58 spinlock_init(&mutex->mutex); |
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59 mutex->recursive = 0; |
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60 mutex->owner = 0; |
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61 } else { |
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62 SDL_OutOfMemory(); |
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63 } |
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64 return mutex; |
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65 } |
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66 |
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67 /* Free the mutex */ |
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68 void SDL_DestroyMutex(SDL_mutex *mutex) |
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69 { |
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70 if ( mutex ) { |
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71 free(mutex); |
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72 } |
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73 } |
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74 |
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75 /* Lock the semaphore */ |
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76 int SDL_mutexP(SDL_mutex *mutex) |
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77 { |
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78 #ifdef DISABLE_THREADS |
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79 return 0; |
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80 #else |
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81 Uint32 this_thread; |
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82 |
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83 if ( mutex == NULL ) { |
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84 SDL_SetError("Passed a NULL mutex"); |
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85 return -1; |
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86 } |
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87 |
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88 this_thread = SDL_ThreadID(); |
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89 if ( mutex->owner == this_thread ) { |
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90 ++mutex->recursive; |
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91 } else { |
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92 /* The order of operations is important. |
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93 We set the locking thread id after we obtain the lock |
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94 so unlocks from other threads will fail. |
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95 */ |
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96 spinlock_lock(&mutex->mutex); |
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97 mutex->owner = this_thread; |
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98 mutex->recursive = 0; |
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99 } |
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100 |
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101 return 0; |
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102 #endif /* DISABLE_THREADS */ |
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103 } |
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104 |
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105 /* Unlock the mutex */ |
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106 int SDL_mutexV(SDL_mutex *mutex) |
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107 { |
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108 #ifdef DISABLE_THREADS |
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109 return 0; |
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110 #else |
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111 if ( mutex == NULL ) { |
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112 SDL_SetError("Passed a NULL mutex"); |
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113 return -1; |
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114 } |
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115 |
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116 /* If we don't own the mutex, we can't unlock it */ |
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117 if ( SDL_ThreadID() != mutex->owner ) { |
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118 SDL_SetError("mutex not owned by this thread"); |
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119 return -1; |
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120 } |
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121 |
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122 if ( mutex->recursive ) { |
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123 --mutex->recursive; |
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124 } else { |
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125 /* The order of operations is important. |
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126 First reset the owner so another thread doesn't lock |
dad72daf44b3
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127 the mutex and set the ownership before we reset it, |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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128 then release the lock semaphore. |
dad72daf44b3
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129 */ |
dad72daf44b3
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130 mutex->owner = 0; |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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131 spinlock_unlock(&mutex->mutex); |
dad72daf44b3
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132 } |
dad72daf44b3
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133 return 0; |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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134 #endif /* DISABLE_THREADS */ |
dad72daf44b3
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Sam Lantinga <slouken@libsdl.org>
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135 } |