Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/SDL_syssem.c @ 1585:980d2a0dc2a3
Date: Tue, 4 Mar 2003 15:05:31 -0800
From: "Jim"
Subject: [SDL] Frame Buffer patches...
Okay I'm new at patch generation - so please tell me if there's a better way
I could have done this.
Attached are two patch files generated with 'cvs diff -u'
SDL-fb-open-lock.patch applies to SDL_fbvideo.c
Modifies the open loop to check /dev/fb/0 found on devfs...
Modifies the lock code to return failure if the current virtual terminal
is not the one opened for frame buffer writing...
Lock would hang forever if switched away (ctrl-alt-F1) ...
SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c
Switches default mouse mode based on SDL_MOUSEDRV - currently only
accepts PS2 - otherwise default is MS Mouse.
When the screen is switched - exisiting code (wrapped in ifdef
SAVE_SCREEN_COTENTS) would save the wrong bit of the screen....
( I run frame buffer 1600x1200, the size I requested was 800x600 - the
save would save the top 800 lines (non biased) and restore them... Adding
screen->offset fixed that )
However, if that option is not set, then a call to SDL_UpdateRect (full
screen) is made. (which may have had it's contents changed since the screen
is not entirely locked because of lock-failure patch)
Jim
[patches slightly tweaked for SDL 1.2.10]
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 22 Mar 2006 07:48:22 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
|
21
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24 /* An implementation of semaphores using mutexes and condition variables */ |
| 0 | 25 |
| 26 #include "SDL_thread.h" | |
| 27 #include "SDL_systhread_c.h" | |
| 28 | |
| 29 | |
| 30 struct SDL_semaphore | |
| 31 { | |
| 32 struct SignalSemaphore Sem; | |
| 33 }; | |
| 34 | |
|
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35 #undef D |
| 0 | 36 |
| 37 #define D(x) | |
| 38 | |
| 39 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 40 { | |
| 41 SDL_sem *sem; | |
| 42 | |
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43 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
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44 |
| 0 | 45 if ( ! sem ) { |
| 46 SDL_OutOfMemory(); | |
| 47 return(0); | |
| 48 } | |
| 49 | |
| 50 D(bug("Creating semaphore %lx...\n",sem)); | |
| 51 | |
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52 SDL_memset(sem,0,sizeof(*sem)); |
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53 |
| 0 | 54 InitSemaphore(&sem->Sem); |
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55 |
| 0 | 56 return(sem); |
| 57 } | |
| 58 | |
| 59 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 60 { | |
| 61 D(bug("Destroying semaphore %lx...\n",sem)); | |
| 62 | |
| 63 if ( sem ) { | |
| 64 // Condizioni per liberare i task in attesa? | |
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65 SDL_free(sem); |
| 0 | 66 } |
| 67 } | |
| 68 | |
| 69 int SDL_SemTryWait(SDL_sem *sem) | |
| 70 { | |
| 71 if ( ! sem ) { | |
| 72 SDL_SetError("Passed a NULL semaphore"); | |
| 73 return -1; | |
| 74 } | |
| 75 | |
| 76 D(bug("TryWait semaphore...%lx\n",sem)); | |
| 77 | |
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78 ObtainSemaphore(&sem->Sem); |
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79 // ReleaseSemaphore(&sem->Sem); |
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80 |
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81 return 1; |
| 0 | 82 } |
| 83 | |
| 84 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 85 { | |
| 86 int retval; | |
| 87 | |
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88 |
| 0 | 89 if ( ! sem ) { |
| 90 SDL_SetError("Passed a NULL semaphore"); | |
| 91 return -1; | |
| 92 } | |
| 93 | |
| 94 D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem)); | |
| 95 | |
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96 /* A timeout of 0 is an easy case */ |
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97 if ( timeout == 0 ) { |
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98 ObtainSemaphore(&sem->Sem); |
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99 return 1; |
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100 } |
| 0 | 101 if(!(retval=AttemptSemaphore(&sem->Sem))) |
| 102 { | |
| 103 SDL_Delay(timeout); | |
| 104 retval=AttemptSemaphore(&sem->Sem); | |
| 105 } | |
| 106 | |
| 107 if(retval==TRUE) | |
| 108 { | |
| 109 // ReleaseSemaphore(&sem->Sem); | |
| 110 retval=1; | |
| 111 } | |
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112 |
| 0 | 113 return retval; |
| 114 } | |
| 115 | |
| 116 int SDL_SemWait(SDL_sem *sem) | |
| 117 { | |
| 118 ObtainSemaphore(&sem->Sem); | |
|
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119 return 0; |
| 0 | 120 } |
| 121 | |
| 122 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 123 { | |
| 124 Uint32 value; | |
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125 |
| 0 | 126 value = 0; |
| 127 if ( sem ) { | |
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128 #ifdef STORMC4_WOS |
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129 value = sem->Sem.ssppc_SS.ss_NestCount; |
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130 #else |
| 0 | 131 value = sem->Sem.ss_NestCount; |
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132 #endif |
| 0 | 133 } |
| 134 return value; | |
| 135 } | |
| 136 | |
| 137 int SDL_SemPost(SDL_sem *sem) | |
| 138 { | |
| 139 if ( ! sem ) { | |
| 140 SDL_SetError("Passed a NULL semaphore"); | |
| 141 return -1; | |
| 142 } | |
| 143 D(bug("SemPost semaphore...%lx\n",sem)); | |
| 144 | |
| 145 ReleaseSemaphore(&sem->Sem); | |
| 146 return 0; | |
| 147 } | |
| 148 |