Make better use of GNU Pth -- patch by Andy Dustman.

I can't test this, so I'm just checking it in with blind faith in Andy.
I've tested that it doesn't broeak a non-Pth build on Linux.

Changes include:

- There's a --with-pth configure option.

- Instead of _GNU_PTH, we test for HAVE_PTH.

- Better signal handling.

- (The config.h.in file is regenerated in a slightly different order.)

Include/Python.h

@@ -111,7 +111,7 @@
 #define Py_file_input 257
 #define Py_eval_input 258
 
-#ifdef _GNU_PTH
+#ifdef HAVE_PTH
 /* GNU pth user-space thread support */
 #include <pth.h>
 #endif

Modules/signalmodule.c

@@ -62,6 +62,9 @@
    handler ignores signals if getpid() isn't the same as in the main
    thread.  XXX This is a hack.
 
+   GNU pth is a user-space threading library, and as such, all threads
+   run within the same process. In this case, if the currently running
+   thread is not the main_thread, send the signal to the main_thread.
 */
 
 #ifdef WITH_THREAD
@@ -109,6 +112,12 @@ static void
 signal_handler(int sig_num)
 {
 #ifdef WITH_THREAD
+#ifdef WITH_PTH
+	if (PyThread_get_thread_ident() != main_thread) {
+		pth_raise(*(pth_t *) main_thread, sig_num);
+		return;
+	}
+#endif
 	/* See NOTES section above */
 	if (getpid() == main_pid) {
 #endif

Python/thread.c

@@ -109,13 +109,14 @@ void PyThread_init_thread(void)
 #include "thread_lwp.h"
 #endif
 
-#ifdef _GNU_PTH
+#ifdef HAVE_PTH
 #include "thread_pth.h"
-#else
+#undef _POSIX_THREADS
+#endif
+
 #ifdef _POSIX_THREADS
 #include "thread_pthread.h"
 #endif
-#endif
 
 #ifdef C_THREADS
 #include "thread_cthread.h"

acconfig.h

@@ -35,9 +35,6 @@
    This is the case on Motorola V4 (R40V4.2) */
 #undef GETTIMEOFDAY_NO_TZ
 
-/* Define if you have GNU PTH threads */
-#undef _GNU_PTH
-
 /* Define this if your time.h defines altzone */
 #undef HAVE_ALTZONE
 
@@ -65,6 +62,9 @@
 /* Define if your compiler supports function prototypes */
 #undef HAVE_PROTOTYPES
 
+/* Define if you have GNU PTH threads */
+#undef HAVE_PTH
+
 /* Define if your compiler supports variable length function prototypes
    (e.g. void fprintf(FILE *, char *, ...);) *and* <stdarg.h> */
 #undef HAVE_STDARG_PROTOTYPES

config.h.in

@@ -103,9 +103,6 @@
    This is the case on Motorola V4 (R40V4.2) */
 #undef GETTIMEOFDAY_NO_TZ
 
-/* Define if you have GNU PTH threads */
-#undef _GNU_PTH
-
 /* Define this if your time.h defines altzone */
 #undef HAVE_ALTZONE
 
@@ -130,6 +127,9 @@
 /* Define if your compiler supports function prototypes */
 #undef HAVE_PROTOTYPES
 
+/* Define if you have GNU PTH threads */
+#undef HAVE_PTH
+
 /* Define if your compiler supports variable length function prototypes
    (e.g. void fprintf(FILE *, char *, ...);) *and* <stdarg.h> */
 #undef HAVE_STDARG_PROTOTYPES
@@ -272,6 +272,9 @@
 /* The number of bytes in a void *.  */
 #undef SIZEOF_VOID_P
 
+/* Define if you have the _getpty function.  */
+#undef HAVE__GETPTY
+
 /* Define if you have the alarm function.  */
 #undef HAVE_ALARM
 
@@ -359,9 +362,6 @@
 /* Define if you have the getpid function.  */
 #undef HAVE_GETPID
 
-/* Define if you have the _getpty function.  */
-#undef HAVE__GETPTY
-
 /* Define if you have the getpwent function.  */
 #undef HAVE_GETPWENT
 
@@ -521,14 +521,14 @@
 /* Define if you have the waitpid function.  */
 #undef HAVE_WAITPID
 
-/* Define if you have the <db_185.h> header file.  */
+/* Define if you have the <db.h> header file.  */
-#undef HAVE_DB_185_H
+#undef HAVE_DB_H
 
 /* Define if you have the <db1/ndbm.h> header file.  */
 #undef HAVE_DB1_NDBM_H
 
-/* Define if you have the <db.h> header file.  */
+/* Define if you have the <db_185.h> header file.  */
-#undef HAVE_DB_H
+#undef HAVE_DB_185_H
 
 /* Define if you have the <dirent.h> header file.  */
 #undef HAVE_DIRENT_H

configure.in

@@ -745,6 +745,15 @@ else
     AC_CHECK_HEADER(mach/cthreads.h, [AC_DEFINE(WITH_THREAD)
     AC_DEFINE(C_THREADS)
     LIBOBJS="$LIBOBJS thread.o"],[
+    AC_MSG_CHECKING(for --with-pth)
+    AC_ARG_WITH(pth,
+    [  --with-pth                      use GNU pth threading libraries], [
+    AC_MSG_RESULT($withval)
+    AC_DEFINE(WITH_THREAD)
+    AC_DEFINE(HAVE_PTH)
+    LIBS="-lpth $LIBS"
+    LIBOBJS="$LIBOBJS thread.o"],[
+    AC_MSG_RESULT(no)
     AC_CHECK_LIB(pthread, pthread_create, [AC_DEFINE(WITH_THREAD)
     AC_DEFINE(_POSIX_THREADS)
     LIBS="-lpthread $LIBS"
@@ -767,10 +776,6 @@ else
     AC_DEFINE(_POSIX_THREADS)
     LIBS="$LIBS -lthread"
     LIBOBJS="$LIBOBJS thread.o"], [
-    AC_CHECK_LIB(pth, pth_init, [AC_DEFINE(WITH_THREAD)
-    AC_DEFINE(_GNU_PTH)
-    LIBS="-lpth $LIBS"
-    LIBOBJS="$LIBOBJS thread.o"],[
     AC_CHECK_LIB(cma, pthread_create, [AC_DEFINE(WITH_THREAD)
     AC_DEFINE(_POSIX_THREADS)
     LIBS="$LIBS -lcma"