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annotate src/thread/pth/SDL_systhread.c @ 4347:38f22ed3a433 SDL-1.2

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Option to fix bug #851 For some people setting the period size works better (and is what SDL 1.2.13 did), but for most people it's the same or worse. You can use an environment variable to pick which one you want.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 17 Oct 2009 06:55:17 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 /*
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25 * GNU pth threads
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26 *
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27 * Patrice Mandin
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28 */
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29
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30 #include <pth.h>
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31 #include <signal.h>
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32
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33 #include "SDL_thread.h"
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34 #include "../SDL_thread_c.h"
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35 #include "../SDL_systhread.h"
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36
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37 /* List of signals to mask in the subthreads */
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38 static int sig_list[] = {
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39 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
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40 SIGVTALRM, SIGPROF, 0
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41 };
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42
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43 static void *RunThread(void *data)
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44 {
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45 SDL_RunThread(data);
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46 pth_exit((void*)0);
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47 return((void *)0); /* Prevent compiler warning */
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48 }
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49
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50 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
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51 {
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52 pth_attr_t type;
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53
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54 /* Create a new attribute */
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55 type = pth_attr_new();
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56 if ( type == NULL ) {
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57 SDL_SetError("Couldn't initialize pth attributes");
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58 return(-1);
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59 }
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60 pth_attr_set(type, PTH_ATTR_JOINABLE, TRUE);
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61
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62 /* Create the thread and go! */
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63 thread->handle = pth_spawn(type, RunThread, args);
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64 if ( thread->handle == NULL ) {
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65 SDL_SetError("Not enough resources to create thread");
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66 return(-1);
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67 }
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68 return(0);
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69 }
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70
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71 void SDL_SYS_SetupThread(void)
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72 {
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73 int i;
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74 sigset_t mask;
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75 int oldstate;
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76
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77 /* Mask asynchronous signals for this thread */
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78 sigemptyset(&mask);
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79 for ( i=0; sig_list[i]; ++i ) {
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80 sigaddset(&mask, sig_list[i]);
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81 }
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82 pth_sigmask(SIG_BLOCK, &mask, 0);
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83
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84 /* Allow ourselves to be asynchronously cancelled */
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85 pth_cancel_state(PTH_CANCEL_ASYNCHRONOUS, &oldstate);
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86 }
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87
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88 /* WARNING: This may not work for systems with 64-bit pid_t */
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89 Uint32 SDL_ThreadID(void)
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90 {
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91 return((Uint32)pth_self());
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92 }
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93
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94 void SDL_SYS_WaitThread(SDL_Thread *thread)
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95 {
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96 pth_join(thread->handle, NULL);
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97 }
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98
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99 void SDL_SYS_KillThread(SDL_Thread *thread)
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100 {
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101 pth_cancel(thread->handle);
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102 pth_join(thread->handle, NULL);
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103 }