This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_systhread.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
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#include "SDL_config.h"
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#include <pthread.h>
#include <signal.h>
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#ifdef linux
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#endif
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#include "SDL_thread.h"
#include "../SDL_thread_c.h"
#include "../SDL_systhread.h"
/* List of signals to mask in the subthreads */
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static const int sig_list[] = {
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SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
SIGVTALRM, SIGPROF, 0
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static void *
RunThread(void *data)
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SDL_RunThread(data);
pthread_exit((void *) 0);
return ((void *) 0); /* Prevent compiler warning */
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int
SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
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pthread_attr_t type;
/* Set the thread attributes */
if (pthread_attr_init(&type) != 0) {
SDL_SetError("Couldn't initialize pthread attributes");
return (-1);
}
pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
/* Create the thread and go! */
if (pthread_create(&thread->handle, &type, RunThread, args) != 0) {
SDL_SetError("Not enough resources to create thread");
return (-1);
}
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void
SDL_SYS_SetupThread(void)
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int i;
sigset_t mask;
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/* Mask asynchronous signals for this thread */
sigemptyset(&mask);
for (i = 0; sig_list[i]; ++i) {
sigaddset(&mask, sig_list[i]);
}
pthread_sigmask(SIG_BLOCK, &mask, 0);
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#ifdef PTHREAD_CANCEL_ASYNCHRONOUS
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/* Allow ourselves to be asynchronously cancelled */
{
int oldstate;
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
}
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SDL_threadID
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SDL_ThreadID(void)
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return ((SDL_threadID) pthread_self());
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SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
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#ifdef linux
int value;
if (priority == SDL_THREAD_PRIORITY_LOW) {
value = 19;
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
value = -20;
} else {
value = 0;
}
if (setpriority(PRIO_PROCESS, syscall(SYS_gettid), value) < 0) {
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/* Note that this fails if you're trying to set high priority
and you don't have root permission. BUT DON'T RUN AS ROOT!
*/
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SDL_SetError("setpriority() failed");
return -1;
}
return 0;
#else
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struct sched_param sched;
int policy;
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pthread_t thread = pthread_self();
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if (pthread_getschedparam(thread, &policy, &sched) < 0) {
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SDL_SetError("pthread_getschedparam() failed");
return -1;
}
if (priority == SDL_THREAD_PRIORITY_LOW) {
sched.sched_priority = sched_get_priority_min(policy);
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
sched.sched_priority = sched_get_priority_max(policy);
} else {
int min_priority = sched_get_priority_min(policy);
int max_priority = sched_get_priority_max(policy);
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sched.sched_priority = (min_priority + (max_priority - min_priority) / 2);
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if (pthread_setschedparam(thread, policy, &sched) < 0) {
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SDL_SetError("pthread_setschedparam() failed");
return -1;
}
return 0;
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#endif /* linux */
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void
SDL_SYS_WaitThread(SDL_Thread * thread)
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pthread_join(thread->handle, 0);
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/* vi: set ts=4 sw=4 expandtab: */