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annotate src/thread/pth/SDL_systhread.c @ 1199:2d6dc7de1145

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From: Mike Frysinger <vapier@gentoo.org> To: sdl@libsdl.org Date: Sun, 11 Dec 2005 22:57:37 -0500 Subject: [SDL] exec stack in libsdl update i posted back in September a patch to remove executable stacks: http://www.devolution.com/pipermail/sdl/2005-September/070626.html later in November, a similar patch was merged it seems: http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm however, this lacks the additional output format checks that i posted in my patch ... this isnt a problem if the hermes asm code is only ever used to produce ELF objects, but if this is not true, then the additional checks in my original patch will need to be merged -mike
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 12 Dec 2005 09:13:12 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
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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
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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 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /*
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29 * GNU pth threads
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30 *
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31 * Patrice Mandin
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32 */
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33
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34 #include "SDL_error.h"
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35 #include "SDL_thread.h"
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36 #include "SDL_systhread.h"
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37
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38 #include <signal.h>
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39 #include <pth.h>
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40
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41 /* List of signals to mask in the subthreads */
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42 static int sig_list[] = {
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43 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
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44 SIGVTALRM, SIGPROF, 0
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45 };
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46
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47 static void *RunThread(void *data)
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48 {
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49 SDL_RunThread(data);
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50 pth_exit((void*)0);
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51 return((void *)0); /* Prevent compiler warning */
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52 }
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53
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54 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
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55 {
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56 pth_attr_t type;
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57
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58 /* Create a new attribute */
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59 type = pth_attr_new();
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60 if ( type == NULL ) {
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61 SDL_SetError("Couldn't initialize pth attributes");
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62 return(-1);
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63 }
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64 pth_attr_set(type, PTH_ATTR_JOINABLE, TRUE);
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65
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66 /* Create the thread and go! */
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67 thread->handle = pth_spawn(type, RunThread, args);
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68 if ( thread->handle == NULL ) {
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69 SDL_SetError("Not enough resources to create thread");
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70 return(-1);
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71 }
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72 return(0);
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73 }
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74
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75 void SDL_SYS_SetupThread(void)
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76 {
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77 int i;
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78 sigset_t mask;
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79 int oldstate;
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80
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81 /* Mask asynchronous signals for this thread */
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82 sigemptyset(&mask);
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83 for ( i=0; sig_list[i]; ++i ) {
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84 sigaddset(&mask, sig_list[i]);
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85 }
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86 pth_sigmask(SIG_BLOCK, &mask, 0);
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87
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88 /* Allow ourselves to be asynchronously cancelled */
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89 pth_cancel_state(PTH_CANCEL_ASYNCHRONOUS, &oldstate);
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90 }
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91
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92 /* WARNING: This may not work for systems with 64-bit pid_t */
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93 Uint32 SDL_ThreadID(void)
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94 {
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95 return((Uint32)pth_self());
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96 }
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97
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98 void SDL_SYS_WaitThread(SDL_Thread *thread)
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99 {
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100 pth_join(thread->handle, 0);
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101 }
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102
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103 void SDL_SYS_KillThread(SDL_Thread *thread)
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104 {
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105 pth_cancel(thread->handle);
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106 pth_join(thread->handle, NULL);
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107 }