Mercurial > sdl-ios-xcode
annotate src/thread/dc/SDL_sysmutex.c @ 1551:02e19471a694
Fixed bug #4
[Note: I'm applying this patch since it's a cleaner version of what's already implemented, and supports this controller on older kernels. I'll ask to make sure this doesn't break on the new kernels where it's no longer necessary]
Date: Mon, 21 Mar 2005 09:41:11 -0500
From: Chris Nelson
Subject: SDL Patch
Hey, Ryan.
I submitted the following patch about a year ago. It's just a simple
patch for the linux port, to make multiple joysticks each appear to SDL
as their own device, if they are on the same USB port (specifically,
these guys
<http://www.consoleplus.co.uk/product_info.php?pName=super-joybox-5-quad-joypad-converter>,
which allow 4 Playstation2 controllers to be accessed via a single USB
port). Without this patch, SDL pretty much drops the ball, and reports
that there are 4 joysticks available when less than that number are
plugged in.
My work built upon the work of another person with the same device. When
I submitted the patch to the list, he tested it, but it didn't work for
him, so the patch was never accepted. Maybe about 3 times in the past
year, I've tried to email the guy, to see if he couldn't run my new
version, complete with debug code to diagnose the problem he was having.
He never got back to me.
So, I'm attaching the patch. I wish I knew why it didn't work for him,
but I've been using it for the last year with no problems. Let me know
if you need any more information, or have any ideas as to how I could
test it. I'd like to see it in the tree, but I want to make sure it works.
-Chris
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 19 Mar 2006 06:31:34 +0000 |
parents | d910939febfa |
children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 Sam Lantinga |
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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 Lesser General Public |
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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. |
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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 Lesser 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 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 |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 /* An implementation of mutexes using semaphores */ |
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25 |
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26 #include "SDL_thread.h" |
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27 #include "SDL_systhread_c.h" |
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28 |
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29 #include <arch/spinlock.h> |
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30 |
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31 struct SDL_mutex { |
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32 int recursive; |
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33 Uint32 owner; |
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34 spinlock_t mutex; |
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35 }; |
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36 |
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37 /* Create a mutex */ |
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38 SDL_mutex *SDL_CreateMutex(void) |
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39 { |
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40 SDL_mutex *mutex; |
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41 |
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42 /* Allocate mutex memory */ |
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43 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex)); |
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44 if ( mutex ) { |
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45 spinlock_init(&mutex->mutex); |
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46 mutex->recursive = 0; |
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47 mutex->owner = 0; |
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48 } else { |
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49 SDL_OutOfMemory(); |
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50 } |
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51 return mutex; |
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52 } |
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53 |
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54 /* Free the mutex */ |
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55 void SDL_DestroyMutex(SDL_mutex *mutex) |
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56 { |
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57 if ( mutex ) { |
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58 SDL_free(mutex); |
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59 } |
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60 } |
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61 |
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62 /* Lock the semaphore */ |
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63 int SDL_mutexP(SDL_mutex *mutex) |
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64 { |
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65 #if SDL_THREADS_DISABLED |
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66 return SDL_arraysize(return ),0; |
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67 #else |
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68 Uint32 this_thread; |
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69 |
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70 if ( mutex == NULL ) { |
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71 SDL_SetError("Passed a NULL mutex"); |
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72 return -1; |
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73 } |
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74 |
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75 this_thread = SDL_ThreadID(); |
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76 if ( mutex->owner == this_thread ) { |
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77 ++mutex->recursive; |
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78 } else { |
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79 /* The order of operations is important. |
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80 We set the locking thread id after we obtain the lock |
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81 so unlocks from other threads will fail. |
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82 */ |
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83 spinlock_lock(&mutex->mutex); |
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84 mutex->owner = this_thread; |
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85 mutex->recursive = 0; |
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86 } |
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87 |
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88 return 0; |
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89 #endif /* SDL_THREADS_DISABLED */ |
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90 } |
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91 |
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92 /* Unlock the mutex */ |
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93 int SDL_mutexV(SDL_mutex *mutex) |
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94 { |
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95 #if SDL_THREADS_DISABLED |
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96 return 0; |
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97 #else |
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98 if ( mutex == NULL ) { |
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99 SDL_SetError("Passed a NULL mutex"); |
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100 return -1; |
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101 } |
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102 |
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103 /* If we don't own the mutex, we can't unlock it */ |
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104 if ( SDL_ThreadID() != mutex->owner ) { |
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105 SDL_SetError("mutex not owned by this thread"); |
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106 return -1; |
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107 } |
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108 |
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109 if ( mutex->recursive ) { |
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110 --mutex->recursive; |
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111 } else { |
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112 /* The order of operations is important. |
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113 First reset the owner so another thread doesn't lock |
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114 the mutex and set the ownership before we reset it, |
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115 then release the lock semaphore. |
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116 */ |
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117 mutex->owner = 0; |
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118 spinlock_unlock(&mutex->mutex); |
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119 } |
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120 return 0; |
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
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121 #endif /* SDL_THREADS_DISABLED */ |
509
dad72daf44b3
Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
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122 } |