2005-11-09  Andrew Stubbs  <andrew.stubbs@st.com>

	* breakpoint.c (breakpoint_thread_match): Disable thread specific
	breakpoints if we hit one after the thread has ceased to exist.

Index: src/gdb/breakpoint.c
===================================================================
--- src.orig/gdb/breakpoint.c	2005-05-29 04:13:17.000000000 +0100
+++ src/gdb/breakpoint.c	2005-11-01 13:49:40.000000000 +0000
@@ -1797,9 +1797,23 @@ breakpoint_thread_match (CORE_ADDR pc, p
 
       if ((breakpoint_enabled (bpt->owner)
 	   || bpt->owner->enable_state == bp_permanent)
-	  && bpt->address == pc
-	  && (bpt->owner->thread == -1 || bpt->owner->thread == thread))
+	  && bpt->address == pc)
 	{
+          /* Disable matched breakpoint if thread no longer exists: this
+	     prevents other tasks from hitting the breakpoint and improves
+	     performance.  */
+          if ((bpt->owner->thread != -1) && (bpt->owner->thread != thread))
+          {
+            if (!target_thread_alive(thread_id_to_pid(bpt->owner->thread)))
+              {
+                printf_filtered (
+		      "Breakpoint %d disabled as thread %d no longer alive.\n",
+		      bpt->owner->number, bpt->owner->thread);
+                disable_breakpoint(bpt->owner);
+              }
+            continue;  /* no need to consider this breakpoint any further */
+          }
+
 	  if (overlay_debugging 
 	      && section_is_overlay (bpt->section) 
 	      && !section_is_mapped (bpt->section))