From 2d9f5f4b2079c1f167a9b9636f5c4b3525815750 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Fri, 14 Sep 2001 04:34:15 +0000
Subject: [PATCH] Added support for the GNU Pth thread lib (thanks Mandin!)

---
 configure.in                     |  27 ++++++++
 docs.html                        |   2 +
 src/thread/Makefile.am           |  13 ++--
 src/thread/pth/SDL_systhread.c   | 102 +++++++++++++++++++++++++++++++
 src/thread/pth/SDL_systhread_c.h |  25 ++++++++
 5 files changed, 163 insertions(+), 6 deletions(-)
 create mode 100644 src/thread/pth/SDL_systhread.c
 create mode 100644 src/thread/pth/SDL_systhread_c.h

diff --git a/configure.in b/configure.in
index 6b6c023dd..b8ef66b62 100644
--- a/configure.in
+++ b/configure.in
@@ -1131,6 +1131,33 @@ CheckPTHREAD()
     AM_CONDITIONAL(USE_CLONE, test x$use_clone = xyes)
 }
 
+dnl See if we can use GNU pth library for threads
+CheckPTH()
+{
+    dnl Check for pth support
+    AC_ARG_ENABLE(pth,
+[  --enable-pth            use GNU pth library for multi-threading [default=yes]],
+                  , enable_pth=yes)
+    if test x$enable_threads = xyes -a x$enable_pth = xyes; then
+        AC_PATH_PROG(PTH_CONFIG, pth-config, no)
+        if test "$PTH_CONFIG" = "no"; then
+            use_pth=no
+        else
+            PTH_CFLAGS=`$PTH_CONFIG --cflags`
+            PTH_LIBS=`$PTH_CONFIG --libs`
+            SDL_CFLAGS="$SDL_CFLAGS $PTH_CFLAGS"
+            SDL_LIBS="$SDL_LIBS $PTH_LIBS"
+            use_pth=yes
+        fi
+        AC_MSG_CHECKING(pth)
+        if test "x$use_pth" = xyes; then
+            AC_MSG_RESULT(yes)
+        else
+            AC_MSG_RESULT(no)
+        fi
+    fi
+}
+
 dnl Determine whether the compiler can produce Win32 executables
 CheckWIN32()
 {
diff --git a/docs.html b/docs.html
index 4a8176bc0..1539f5096 100644
--- a/docs.html
+++ b/docs.html
@@ -16,6 +16,8 @@ <H2>
 Major changes since SDL 1.0.0:
 </H2>
 <UL>
+	<LI> 1.2.3: Added support for the GNU Pth thread lib (thanks Mandin!)
+	<LI> 1.2.3: Added the Undo key for the Atari keyboard (thanks Mandin!)
 	<LI> 1.2.3: Fixed XVideo on GeForce by using last available adaptor
 	<LI> 1.2.3: Added CD-ROM support for BSD/OS (thanks Steven!)
 	<LI> 1.2.3: Added library version information to the Windows DLL
diff --git a/src/thread/Makefile.am b/src/thread/Makefile.am
index 954335ac0..59f0126ce 100644
--- a/src/thread/Makefile.am
+++ b/src/thread/Makefile.am
@@ -3,12 +3,13 @@
 
 noinst_LTLIBRARIES = libthread.la
 
-ARCH_SUBDIRS = $(srcdir)/generic \
-               $(srcdir)/amigaos \
-               $(srcdir)/beos \
-               $(srcdir)/epoc \
-               $(srcdir)/irix \
-               $(srcdir)/linux \
+ARCH_SUBDIRS = $(srcdir)/generic	\
+               $(srcdir)/amigaos	\
+               $(srcdir)/beos		\
+               $(srcdir)/epoc		\
+               $(srcdir)/irix		\
+               $(srcdir)/linux		\
+               $(srcdir)/pth		\
                $(srcdir)/win32
 
 # Older versions of Linux require an asm clone() implementation
diff --git a/src/thread/pth/SDL_systhread.c b/src/thread/pth/SDL_systhread.c
new file mode 100644
index 000000000..7b13da44c
--- /dev/null
+++ b/src/thread/pth/SDL_systhread.c
@@ -0,0 +1,102 @@
+/*
+    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
+
+/* Pth thread management routines for SDL */
+
+#include "SDL_error.h"
+#include "SDL_thread.h"
+#include "SDL_systhread.h"
+
+#include <signal.h>
+#include <pth.h>
+
+/* List of signals to mask in the subthreads */
+static int sig_list[] = {
+	SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
+	SIGVTALRM, SIGPROF, 0
+};
+
+static void *RunThread(void *data)
+{
+	SDL_RunThread(data);
+	pth_exit((void*)0);
+	return((void *)0);		/* Prevent compiler warning */
+}
+
+int SDL_SYS_CreateThread(SDL_Thread *thread, void *args)
+{
+	pth_attr_t type;
+
+	/* Set the thread attributes */
+	if ( pth_attr_init(&type) != 0 ) {
+		SDL_SetError("Couldn't initialize pth attributes");
+		return(-1);
+	}
+	pth_attr_set(&type, PTH_ATTR_JOINABLE, TRUE);
+
+	/* Create the thread and go! */
+	if ( pth_spawn( &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]);
+	}
+	pth_sigmask(SIG_BLOCK, &mask, 0);
+
+	/* Allow ourselves to be asynchronously cancelled */
+	{ int oldstate;
+		pth_cancel_state(PTH_CANCEL_ASYNCHRONOUS, &oldstate);
+	}
+}
+
+/* WARNING:  This may not work for systems with 64-bit pid_t */
+Uint32 SDL_ThreadID(void)
+{
+	return((Uint32)pth_self());
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+	pth_join(thread->handle, 0);
+}
+
+void SDL_SYS_KillThread(SDL_Thread *thread)
+{
+	pth_cancel(thread->handle);
+	pth_join(thread->handle, NULL);
+}
diff --git a/src/thread/pth/SDL_systhread_c.h b/src/thread/pth/SDL_systhread_c.h
new file mode 100644
index 000000000..a8be3d938
--- /dev/null
+++ b/src/thread/pth/SDL_systhread_c.h
@@ -0,0 +1,25 @@
+/*
+    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
+*/
+
+#include <pth.h>
+
+typedef pth_t SYS_ThreadHandle;