* linux-nat.c (struct simple_pid_list): Add status.

(add_to_pid_list): Record the PID's status.
	(linux_record_stopped_pid): Likewise.  Make static.
	(pull_pid_from_list): Return the saved status.
	(linux_nat_handle_extended): Deleted.
	(linux_handle_extended_wait): Combine with linux_nat_handle_extended.
	Make static.  Handle non-SIGSTOP for a new thread's first signal.
	(flush_callback): Handle unexpected pending signals.
	(linux_nat_wait): Update calls to changed functions.
	* linux-nat.h (linux_record_stopped_pid, linux_handle_extended_wait):
	Remove prototypes for newly static functions.

	* gdb.threads/sigthread.c, gdb.threads/sigthread.exp: New.

gdb/testsuite/gdb.threads/sigthread.c

@@ -0,0 +1,67 @@
+/* Test case for C-c sent to threads with pending signals.  Before I
+   even get there, creating a thread and sending it a signal before it
+   has a chance to run leads to an internal error in GDB.  We need to
+   record that there's a pending SIGSTOP, so that we'll ignore it
+   later, and pass the current signal back to the thread.
+
+   The fork/vfork case has similar trouble but that's even harder
+   to get around.  We may need to send a SIGCONT to cancel out the
+   SIGSTOP.  Different kernels may do different things if the thread
+   is stopped by ptrace and sent a SIGSTOP.  */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <signal.h>
+
+/* Loop long enough for GDB to send a few signals of its own, but
+   don't hang around eating CPU forever if something goes wrong during
+   testing.  */
+#define NSIGS 1000000
+
+void
+handler (int sig)
+{
+  ;
+}
+
+pthread_t main_thread;
+pthread_t child_thread, child_thread_two;
+
+void *
+child_two (void *arg)
+{
+  int i;
+
+  for (i = 0; i < NSIGS; i++)
+    pthread_kill (child_thread, SIGUSR1);
+}
+
+void *
+thread_function (void *arg)
+{
+  int i;
+
+  for (i = 0; i < NSIGS; i++)
+    pthread_kill (child_thread_two, SIGUSR2);
+}
+
+int main()
+{
+  int i;
+
+  signal (SIGUSR1, handler);
+  signal (SIGUSR2, handler);
+
+  main_thread = pthread_self ();
+  pthread_create (&child_thread, NULL, thread_function, NULL);
+  pthread_create (&child_thread_two, NULL, child_two, NULL);
+
+  for (i = 0; i < NSIGS; i++)
+    pthread_kill (child_thread_two, SIGUSR1);
+
+  pthread_join (child_thread, NULL);
+
+  exit (0);
+}

gdb/testsuite/gdb.threads/sigthread.exp

@@ -0,0 +1,56 @@
+# sigthread.exp -- Expect script to test thread and signal interaction
+# Copyright (C) 2007 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program 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 General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+set testfile sigthread
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+
+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
+	 executable { debug }] != "" } {
+    return -1
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+if ![runto_main] then {
+   fail "Can't run to main"
+   return 0
+}
+
+gdb_test "handle SIGUSR1 nostop noprint pass"
+gdb_test "handle SIGUSR2 nostop noprint pass"
+
+send_gdb "continue\n"
+gdb_expect {
+    -re "Continuing" {
+	pass "continue"
+    }
+    timeout {
+	fail "continue (timeout)"
+    }
+}
+
+# For this to work we must be sure to consume the "Continuing."
+# message first, or GDB's signal handler may not be in place.
+after 500 {send_gdb "\003"}
+
+# Make sure we do not get an internal error from hitting Control-C
+# while many signals are flying back and forth.
+gdb_test "" "Program received signal SIGINT.*" "stop with control-c"