Mercurial > sdl-ios-xcode
annotate src/thread/pthread/SDL_systhread.c @ 3162:dc1eb82ffdaa
Von: Thomas Zimmermann
Betreff: [SDL] [PATCH] Make static variables const
Datum: Tue, 19 May 2009 19:45:37 +0200
Hi,
this is a set of simple changes which make some of SDL's internal static
arrays constant. The purpose is to shrink the number of write-able
static bytes and thus increase the number of memory pages shared between
SDL applications.
The patch set is against trunk@4513. Each of the attached patch files is
specific to a sub-system. The set is completed by a second mail, because
of the list's 40 KiB limit.
The files readelf-r4513.txt and readelf-const-patch.txt where made by
calling 'readelf -S libSDL.so'. They show the difference in ELF sections
without and with the patch. Some numbers measured on my x86-64:
Before
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000008170 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 00000000003045e0 001045e0
00000000000023d0 0000000000000000 WA 0 0 32
[23] .data PROGBITS 00000000003076e0 001076e0
0000000000004988 0000000000000000 WA 0 0 32
After
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000009a50 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 0000000000306040 00106040
0000000000002608 0000000000000000 WA 0 0 32
[23] .data PROGBITS 0000000000309360 00109360
0000000000002e88 0000000000000000 WA 0 0 32
The size of the write-able data section decreased considerably. Some
entries became const-after-relocation, while most of its content went
straight into the read-only data section.
Best regards, Thomas
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 03 Jun 2009 04:37:27 +0000 |
parents | 99210400e8b9 |
children | 0d1b16ee0bca |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 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 #include <pthread.h> |
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25 #include <signal.h> |
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26 |
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27 #include "SDL_thread.h" |
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28 #include "../SDL_thread_c.h" |
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29 #include "../SDL_systhread.h" |
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30 |
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31 /* List of signals to mask in the subthreads */ |
3162 | 32 static const int sig_list[] = { |
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33 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH, |
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34 SIGVTALRM, SIGPROF, 0 |
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35 }; |
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36 |
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37 #ifdef __RISCOS__ |
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38 /* RISC OS needs to know the main thread for |
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39 * it's timer and event processing. */ |
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40 int riscos_using_threads = 0; |
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41 Uint32 riscos_main_thread = 0; /* Thread running events */ |
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42 #endif |
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43 |
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44 |
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45 static void * |
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46 RunThread(void *data) |
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47 { |
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48 SDL_RunThread(data); |
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49 pthread_exit((void *) 0); |
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50 return ((void *) 0); /* Prevent compiler warning */ |
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51 } |
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52 |
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53 int |
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54 SDL_SYS_CreateThread(SDL_Thread * thread, void *args) |
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55 { |
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56 pthread_attr_t type; |
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57 |
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58 /* Set the thread attributes */ |
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59 if (pthread_attr_init(&type) != 0) { |
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60 SDL_SetError("Couldn't initialize pthread attributes"); |
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61 return (-1); |
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62 } |
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63 pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE); |
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64 |
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65 /* Create the thread and go! */ |
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66 if (pthread_create(&thread->handle, &type, RunThread, args) != 0) { |
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67 SDL_SetError("Not enough resources to create thread"); |
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68 return (-1); |
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69 } |
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70 #ifdef __RISCOS__ |
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71 if (riscos_using_threads == 0) { |
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72 riscos_using_threads = 1; |
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73 riscos_main_thread = SDL_ThreadID(); |
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74 } |
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75 #endif |
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76 |
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77 return (0); |
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78 } |
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79 |
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80 void |
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81 SDL_SYS_SetupThread(void) |
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82 { |
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83 int i; |
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84 sigset_t mask; |
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85 |
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86 /* Mask asynchronous signals for this thread */ |
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87 sigemptyset(&mask); |
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88 for (i = 0; sig_list[i]; ++i) { |
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89 sigaddset(&mask, sig_list[i]); |
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90 } |
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91 pthread_sigmask(SIG_BLOCK, &mask, 0); |
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92 |
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93 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS |
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94 /* Allow ourselves to be asynchronously cancelled */ |
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95 { |
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96 int oldstate; |
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97 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate); |
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98 } |
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99 #endif |
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100 } |
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101 |
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102 /* WARNING: This may not work for systems with 64-bit pid_t */ |
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103 Uint32 |
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104 SDL_ThreadID(void) |
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105 { |
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106 return ((Uint32) pthread_self()); |
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107 } |
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108 |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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109 void |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1459
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changeset
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110 SDL_SYS_WaitThread(SDL_Thread * thread) |
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New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
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111 { |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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112 pthread_join(thread->handle, 0); |
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New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
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113 } |
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
diff
changeset
|
114 |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1459
diff
changeset
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115 /* vi: set ts=4 sw=4 expandtab: */ |