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annotate src/thread/pth/SDL_systhread.c @ 1157:baf35853ad54

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Date: Mon, 10 Oct 2005 13:09:32 +0300 From: Tommi Kyntola <tommi.kyntola@ray.fi> To: sdl@libsdl.org Subject: [SDL] [RFC] get_ticks broken on linux It uses gettimeofday to calculate the timedifference. Gettimeofday returns current time which is seldom monotonous. This breaks SDL timer subsystem. (time callbacks and all that get borked when the time difference ms is suddenly ~ 2^32) I posted a message about this earlier but got no response. Some thoughts on this matter would be appreciated. (Or even an explanation for the lack of interest.) A patch below would use the posix timers that have been around since posix 93 and do provide a good source of monotonous time on linux boxes (and on few others too). The following patch is also availabe at: http://www.hut.fi/u/tkyntola/SDL-1.2.9-clockfix.patch It's against 1.2.9, but I can easily rediffit against the cvs branch is needed. cheers, Tommi Kyntola tommi.kyntola@ray.fi
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 11 Oct 2005 18:16:12 +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 }