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SDL_systhread.c
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SDL_systhread.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
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
*/
/* Linux thread management routines for SDL */
#include "SDL_stdlib.h"
#include "SDL_error.h"
#include "SDL_thread.h"
#include "SDL_systhread.h"
#ifdef FORK_HACK
#include <unistd.h>
int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
SDL_SetError("Threads are not supported on this platform");
return(-1);
}
void SDL_SYS_SetupThread(void)
{
return;
}
Uint32 SDL_ThreadID(void)
{
return((Uint32)getpid());
}
void SDL_SYS_WaitThread(SDL_Thread *thread)
{
return;
}
void SDL_SYS_KillThread(SDL_Thread *thread)
{
return;
}
#else
#include <signal.h>
/* List of signals to mask in the subthreads */
static int sig_list[] = {
SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
SIGVTALRM, SIGPROF, 0
};
#ifdef SDL_USE_PTHREADS
#include <pthread.h>
static void *RunThread(void *data)
{
SDL_RunThread(data);
pthread_exit((void*)0);
return((void *)0); /* Prevent compiler warning */
}
int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
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);
}
return(0);
}
void SDL_SYS_SetupThread(void)
{
int i;
sigset_t mask;
/* 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);
#ifdef PTHREAD_CANCEL_ASYNCHRONOUS
/* Allow ourselves to be asynchronously cancelled */
{ int oldstate;
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
}
#endif
}
/* WARNING: This may not work for systems with 64-bit pid_t */
Uint32 SDL_ThreadID(void)
{
return((Uint32)pthread_self());
}
void SDL_SYS_WaitThread(SDL_Thread *thread)
{
pthread_join(thread->handle, 0);
}
void SDL_SYS_KillThread(SDL_Thread *thread)
{
#ifdef PTHREAD_CANCEL_ASYNCHRONOUS
pthread_cancel(thread->handle);
#else
#ifdef __FreeBSD__
#warning For some reason, this doesnt actually kill a thread - FreeBSD 3.2
#endif
pthread_kill(thread->handle, SIGKILL);
#endif
}
#else /* Linux-specific clone() based implementation */
#include <errno.h>
#include <unistd.h>
#include <sys/wait.h>
/* Stack size for child thread */
#define STACKSIZE 16384*4 /* 16384 is too small */
#ifdef __GLIBC__
#include <sched.h>
#else
/* From <linux/sched.h> */
#define CLONE_VM 0x00000100 /* set if VM shared */
#define CLONE_FS 0x00000200 /* set if fs info shared */
#define CLONE_FILES 0x00000400 /* set if open files shared */
#define CLONE_SIGHAND 0x00000800 /* set if signal handlers shared */
#define CLONE_PID 0x00001000 /* set if pid shared */
/* The infamous "start_thread" function, courtesy Linus Torvalds */
extern int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg);
#endif
static int RunThread(void *data)
{
SDL_RunThread(data);
return(0);
}
int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
{
void *stack;
/* Allocate memory for thread stack */
stack = SDL_malloc(STACKSIZE);
if ( stack == (void *)0 ) {
SDL_OutOfMemory();
return(-1);
}
thread->data = stack;
/* Adjust the stack since it actually grows down */
stack = (void *) ((char *)stack + STACKSIZE);
/* Create the thread and go! */
thread->handle = clone(RunThread, stack,
(CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND), args);
if ( thread->handle < 0 ) {
SDL_free(thread->data);
SDL_SetError("Not enough resources to create thread");
return(-1);
}
return(0);
}
void SDL_SYS_SetupThread(void)
{
int i;
sigset_t mask;
/* Mask asynchronous signals for this thread */
sigemptyset(&mask);
for ( i=0; sig_list[i]; ++i ) {
sigaddset(&mask, sig_list[i]);
}
sigprocmask(SIG_BLOCK, &mask, 0);
}
/* WARNING: This may not work for systems with 64-bit pid_t */
Uint32 SDL_ThreadID(void)
{
return((Uint32)getpid());
}
void SDL_SYS_WaitThread(SDL_Thread *thread)
{
#ifdef __WCLONE
errno = 0;
while ( errno != ECHILD ) {
waitpid(thread->handle, 0, __WCLONE);
}
#else
/* Ack, ugly ugly hack --
wait() doesn't work, waitpid() doesn't work, and ignoring SIG_CHLD
doesn't work .. and the child thread is still a zombie, so kill()
doesn't work.
*/
char command[1024];
SDL_snprintf(command, SDL_arraysize(command),
"ps ax|fgrep -v fgrep|fgrep -v '<zombie>'|fgrep %d >/dev/null",
thread->handle);
while ( system(command) == 0 )
sleep(1);
#endif
SDL_free(thread->data);
}
void SDL_SYS_KillThread(SDL_Thread *thread)
{
kill(thread->handle, SIGKILL);
}
#endif /* SDL_USE_PTHREADS */
#endif /* FORK_HACK */