--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/thread/linux/SDL_systhread.c	Thu Apr 26 16:45:43 2001 +0000
@@ -0,0 +1,255 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@devolution.com
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+/* Linux thread management routines for SDL */
+
+#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>
+
+#if !defined(MACOSX) /* pthread_sigmask seems to be missing on MacOS X? */
+/* List of signals to mask in the subthreads */
+static int sig_list[] = {
+	SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
+	SIGVTALRM, SIGPROF, 0
+};
+#endif /* !MACOSX */
+
+#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)
+{
+#if !defined(MACOSX) /* pthread_sigmask seems to be missing on MacOS X? */
+	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);
+#endif /* !MACOSX */
+
+#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 <stdlib.h>
+#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 = 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 ) {
+		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];
+
+	sprintf(command,
+		"ps ax|fgrep -v fgrep|fgrep -v '<zombie>'|fgrep %d >/dev/null",
+								thread->handle);
+	while ( system(command) == 0 )
+		sleep(1);
+#endif
+	free(thread->data);
+}
+
+void SDL_SYS_KillThread(SDL_Thread *thread)
+{
+	kill(thread->handle, SIGKILL);
+}
+
+#endif /* SDL_USE_PTHREADS */
+
+#endif /* FORK_HACK */