author | Sam Lantinga <slouken@libsdl.org> |
Mon, 10 Jul 2006 21:04:37 +0000 | |
changeset 1895 | c121d94672cb |
parent 1769 | 290b5baf2fca |
child 2779 | 4436464c4f51 |
permissions | -rw-r--r-- |
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 |
c9b51268668f
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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 |
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19 |
Sam Lantinga |
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20 |
slouken@libsdl.org |
0 | 21 |
*/ |
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22 |
#include "SDL_config.h" |
0 | 23 |
|
24 |
/* System independent thread management routines for SDL */ |
|
25 |
||
26 |
#include "SDL_mutex.h" |
|
27 |
#include "SDL_thread.h" |
|
28 |
#include "SDL_thread_c.h" |
|
29 |
#include "SDL_systhread.h" |
|
30 |
||
31 |
#define ARRAY_CHUNKSIZE 32 |
|
32 |
/* The array of threads currently active in the application |
|
33 |
(except the main thread) |
|
34 |
The manipulation of an array here is safer than using a linked list. |
|
35 |
*/ |
|
36 |
static int SDL_maxthreads = 0; |
|
37 |
static int SDL_numthreads = 0; |
|
38 |
static SDL_Thread **SDL_Threads = NULL; |
|
39 |
static SDL_mutex *thread_lock = NULL; |
|
40 |
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41 |
int |
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42 |
SDL_ThreadsInit(void) |
0 | 43 |
{ |
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int retval; |
0 | 45 |
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46 |
retval = 0; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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47 |
thread_lock = SDL_CreateMutex(); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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48 |
if (thread_lock == NULL) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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49 |
retval = -1; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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50 |
} |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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51 |
return (retval); |
0 | 52 |
} |
53 |
||
54 |
/* This should never be called... |
|
55 |
If this is called by SDL_Quit(), we don't know whether or not we should |
|
56 |
clean up threads here. If any threads are still running after this call, |
|
57 |
they will no longer have access to any per-thread data. |
|
58 |
*/ |
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59 |
void |
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60 |
SDL_ThreadsQuit(void) |
0 | 61 |
{ |
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62 |
SDL_mutex *mutex; |
0 | 63 |
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64 |
mutex = thread_lock; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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65 |
thread_lock = NULL; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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66 |
if (mutex != NULL) { |
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67 |
SDL_DestroyMutex(mutex); |
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68 |
} |
0 | 69 |
} |
70 |
||
71 |
/* Routines for manipulating the thread list */ |
|
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72 |
static void |
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73 |
SDL_AddThread(SDL_Thread * thread) |
0 | 74 |
{ |
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75 |
/* WARNING: |
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76 |
If the very first threads are created simultaneously, then |
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77 |
there could be a race condition causing memory corruption. |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
78 |
In practice, this isn't a problem because by definition there |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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79 |
is only one thread running the first time this is called. |
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80 |
*/ |
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81 |
if (!thread_lock) { |
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82 |
if (SDL_ThreadsInit() < 0) { |
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83 |
return; |
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84 |
} |
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85 |
} |
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86 |
SDL_mutexP(thread_lock); |
0 | 87 |
|
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88 |
/* Expand the list of threads, if necessary */ |
0 | 89 |
#ifdef DEBUG_THREADS |
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90 |
printf("Adding thread (%d already - %d max)\n", |
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91 |
SDL_numthreads, SDL_maxthreads); |
0 | 92 |
#endif |
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93 |
if (SDL_numthreads == SDL_maxthreads) { |
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94 |
SDL_Thread **threads; |
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95 |
threads = (SDL_Thread **) SDL_realloc(SDL_Threads, |
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96 |
(SDL_maxthreads + |
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97 |
ARRAY_CHUNKSIZE) * |
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98 |
(sizeof *threads)); |
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99 |
if (threads == NULL) { |
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100 |
SDL_OutOfMemory(); |
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101 |
goto done; |
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102 |
} |
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103 |
SDL_maxthreads += ARRAY_CHUNKSIZE; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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104 |
SDL_Threads = threads; |
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105 |
} |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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106 |
SDL_Threads[SDL_numthreads++] = thread; |
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107 |
done: |
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|
108 |
SDL_mutexV(thread_lock); |
0 | 109 |
} |
110 |
||
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111 |
static void |
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112 |
SDL_DelThread(SDL_Thread * thread) |
0 | 113 |
{ |
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114 |
int i; |
0 | 115 |
|
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116 |
if (!thread_lock) { |
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117 |
return; |
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118 |
} |
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119 |
SDL_mutexP(thread_lock); |
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120 |
for (i = 0; i < SDL_numthreads; ++i) { |
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121 |
if (thread == SDL_Threads[i]) { |
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122 |
break; |
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123 |
} |
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124 |
} |
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125 |
if (i < SDL_numthreads) { |
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126 |
if (--SDL_numthreads > 0) { |
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127 |
while (i < SDL_numthreads) { |
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128 |
SDL_Threads[i] = SDL_Threads[i + 1]; |
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129 |
++i; |
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130 |
} |
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131 |
} else { |
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132 |
SDL_maxthreads = 0; |
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133 |
SDL_free(SDL_Threads); |
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134 |
SDL_Threads = NULL; |
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135 |
} |
0 | 136 |
#ifdef DEBUG_THREADS |
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137 |
printf("Deleting thread (%d left - %d max)\n", |
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138 |
SDL_numthreads, SDL_maxthreads); |
0 | 139 |
#endif |
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140 |
} |
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|
141 |
SDL_mutexV(thread_lock); |
1499 | 142 |
|
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|
143 |
if (SDL_Threads == NULL) { |
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144 |
SDL_ThreadsQuit(); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
145 |
} |
0 | 146 |
} |
147 |
||
148 |
/* The default (non-thread-safe) global error variable */ |
|
149 |
static SDL_error SDL_global_error; |
|
150 |
||
151 |
/* Routine to get the thread-specific error variable */ |
|
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152 |
SDL_error * |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
153 |
SDL_GetErrBuf(void) |
0 | 154 |
{ |
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155 |
SDL_error *errbuf; |
0 | 156 |
|
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|
157 |
errbuf = &SDL_global_error; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
158 |
if (SDL_Threads) { |
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|
159 |
int i; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
160 |
Uint32 this_thread; |
0 | 161 |
|
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|
162 |
this_thread = SDL_ThreadID(); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
163 |
SDL_mutexP(thread_lock); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
164 |
for (i = 0; i < SDL_numthreads; ++i) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
165 |
if (this_thread == SDL_Threads[i]->threadid) { |
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|
166 |
errbuf = &SDL_Threads[i]->errbuf; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
167 |
break; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
168 |
} |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
169 |
} |
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|
170 |
SDL_mutexV(thread_lock); |
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|
171 |
} |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
172 |
return (errbuf); |
0 | 173 |
} |
174 |
||
175 |
||
176 |
/* Arguments and callback to setup and run the user thread function */ |
|
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|
177 |
typedef struct |
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|
178 |
{ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
179 |
int (SDLCALL * func) (void *); |
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|
180 |
void *data; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
181 |
SDL_Thread *info; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
182 |
SDL_sem *wait; |
0 | 183 |
} thread_args; |
184 |
||
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|
185 |
void |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
186 |
SDL_RunThread(void *data) |
0 | 187 |
{ |
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|
188 |
thread_args *args; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
189 |
int (SDLCALL * userfunc) (void *); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
190 |
void *userdata; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
191 |
int *statusloc; |
0 | 192 |
|
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|
193 |
/* Perform any system-dependent setup |
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194 |
- this function cannot fail, and cannot use SDL_SetError() |
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|
195 |
*/ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
196 |
SDL_SYS_SetupThread(); |
0 | 197 |
|
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|
198 |
/* Get the thread id */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
199 |
args = (thread_args *) data; |
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200 |
args->info->threadid = SDL_ThreadID(); |
0 | 201 |
|
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|
202 |
/* Figure out what function to run */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
203 |
userfunc = args->func; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
204 |
userdata = args->data; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
205 |
statusloc = &args->info->status; |
0 | 206 |
|
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|
207 |
/* Wake up the parent thread */ |
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|
208 |
SDL_SemPost(args->wait); |
0 | 209 |
|
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|
210 |
/* Run the function */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
211 |
*statusloc = userfunc(userdata); |
0 | 212 |
} |
213 |
||
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|
214 |
#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD |
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It's now possible to build SDL without any C runtime at all on Windows,
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|
215 |
#undef SDL_CreateThread |
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|
216 |
DECLSPEC SDL_Thread *SDLCALL |
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|
217 |
SDL_CreateThread(int (SDLCALL * fn) (void *), void *data, |
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|
218 |
pfnSDL_CurrentBeginThread pfnBeginThread, |
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|
219 |
pfnSDL_CurrentEndThread pfnEndThread) |
1190 | 220 |
#else |
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|
221 |
DECLSPEC SDL_Thread *SDLCALL |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
222 |
SDL_CreateThread(int (SDLCALL * fn) (void *), void *data) |
1190 | 223 |
#endif |
0 | 224 |
{ |
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|
225 |
SDL_Thread *thread; |
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|
226 |
thread_args *args; |
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|
227 |
int ret; |
0 | 228 |
|
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|
229 |
/* Allocate memory for the thread info structure */ |
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|
230 |
thread = (SDL_Thread *) SDL_malloc(sizeof(*thread)); |
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|
231 |
if (thread == NULL) { |
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|
232 |
SDL_OutOfMemory(); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
233 |
return (NULL); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
234 |
} |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
235 |
SDL_memset(thread, 0, (sizeof *thread)); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
236 |
thread->status = -1; |
0 | 237 |
|
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|
238 |
/* Set up the arguments for the thread */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
239 |
args = (thread_args *) SDL_malloc(sizeof(*args)); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
240 |
if (args == NULL) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
241 |
SDL_OutOfMemory(); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
242 |
SDL_free(thread); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
243 |
return (NULL); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
244 |
} |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
245 |
args->func = fn; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
246 |
args->data = data; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
247 |
args->info = thread; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
248 |
args->wait = SDL_CreateSemaphore(0); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
249 |
if (args->wait == NULL) { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
250 |
SDL_free(thread); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
251 |
SDL_free(args); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
252 |
return (NULL); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
253 |
} |
0 | 254 |
|
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|
255 |
/* Add the thread to the list of available threads */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
256 |
SDL_AddThread(thread); |
0 | 257 |
|
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|
258 |
/* Create the thread and go! */ |
1471
9fb0eee04dd9
Enabled libc support on Win32, so we don't break binary compatibility in 1.2
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diff
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|
259 |
#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD |
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|
260 |
ret = SDL_SYS_CreateThread(thread, args, pfnBeginThread, pfnEndThread); |
1190 | 261 |
#else |
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|
262 |
ret = SDL_SYS_CreateThread(thread, args); |
1190 | 263 |
#endif |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
264 |
if (ret >= 0) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
265 |
/* Wait for the thread function to use arguments */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
266 |
SDL_SemWait(args->wait); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
267 |
} else { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
268 |
/* Oops, failed. Gotta free everything */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
269 |
SDL_DelThread(thread); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
270 |
SDL_free(thread); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
271 |
thread = NULL; |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
272 |
} |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
273 |
SDL_DestroySemaphore(args->wait); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
274 |
SDL_free(args); |
0 | 275 |
|
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|
276 |
/* Everything is running now */ |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
277 |
return (thread); |
0 | 278 |
} |
279 |
||
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|
280 |
void |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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|
281 |
SDL_WaitThread(SDL_Thread * thread, int *status) |
0 | 282 |
{ |
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if (thread) { |
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SDL_SYS_WaitThread(thread); |
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if (status) { |
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*status = thread->status; |
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} |
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SDL_DelThread(thread); |
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SDL_free(thread); |
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290 |
} |
0 | 291 |
} |
292 |
||
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293 |
Uint32 |
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SDL_GetThreadID(SDL_Thread * thread) |
0 | 295 |
{ |
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Uint32 id; |
0 | 297 |
|
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298 |
if (thread) { |
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id = thread->threadid; |
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300 |
} else { |
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id = SDL_ThreadID(); |
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} |
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return (id); |
0 | 304 |
} |
305 |
||
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306 |
void |
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307 |
SDL_KillThread(SDL_Thread * thread) |
0 | 308 |
{ |
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309 |
if (thread) { |
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parents:
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changeset
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310 |
SDL_SYS_KillThread(thread); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
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311 |
SDL_WaitThread(thread, NULL); |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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} |
0 | 313 |
} |
314 |
||
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315 |
/* vi: set ts=4 sw=4 expandtab: */ |