Mercurial > sdl-ios-xcode
annotate src/thread/dc/SDL_sysmutex.c @ 914:bbf8dcc8aed6
Date: Wed, 23 Jun 2004 17:05:33 -0400
From: Chris Nelson
Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick)
In the current cvs version, SDL doesn't handle these Playstation2
controller => USB adapters correctly, in linux.
It will always assume that the maximum number of joysticks (2 in the
case of the MP-8866, 4 in the case of the 8800) are plugged in. This is
bad not only because it allows SDL to exaggerate the number of logical
joysticks, but primarily because the joystick axes are mapped
incorrectly, all over the place, such that the devices are effectively
unusable unless you have the maximum number of joysticks plugged in.
My changes to src/joystick/linux/SDL_sysjoystick.c build on another's
previous work (which was a special case for this very joystick,
actually), and fix both of these problems, as well as making the current
code a little more general, to allow for others to more easily drop in
code for quirky joysticks such as these.
I've tested this code under 2.6.7 as well as 2.4.24... Both work as
advertised (provided you load the JOYDEV linux code as a module,
otherwise they won't work at all, new code or old, but that's another
issue entirely).
Though this sounds horribly formal, you have my permission to distribute
all of my work on this issue under the LGPL. So there.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 25 Jul 2004 18:31:50 +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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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 |
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127 the mutex and set the ownership before we reset it, |
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128 then release the lock semaphore. |
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129 */ |
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130 mutex->owner = 0; |
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131 spinlock_unlock(&mutex->mutex); |
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132 } |
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133 return 0; |
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134 #endif /* DISABLE_THREADS */ |
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135 } |