Remove trap_ptid

[Pedro Alves <pedro@codesourcery.com>]

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Any objection to garbage collecting this?

This stopped being needed with the switch to generic_prepare_to_proceed
(nowadays prepare_to_proceed in infrun.c) a few years ago.

Tested on x86_64-unknown-linux-gnu, just in case.

I'm leaving the debug output that used it in place, in case
someone would miss it; just say so, and I'll zap it too.

-- 
Pedro Alves

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2008-05-15  Pedro Alves  <pedro@codesourcery.com>

	* linux-nat.c (trap_ptid): Delete.
	(linux_nat_detach, linux_nat_wait, linux_nat_mourn_inferior)
	(thread_db_wait): Adjust.

---
 gdb/linux-nat.c       |   16 ++--------------
 gdb/linux-thread-db.c |    5 -----
 2 files changed, 2 insertions(+), 19 deletions(-)

Index: src/gdb/linux-nat.c
===================================================================
--- src.orig/gdb/linux-nat.c	2008-05-15 17:54:26.000000000 +0100
+++ src/gdb/linux-nat.c	2008-05-15 17:55:45.000000000 +0100
@@ -790,11 +790,6 @@ struct lwp_info *lwp_list;
 static int num_lwps;
 \f
 
-/* If the last reported event was a SIGTRAP, this variable is set to
-   the process id of the LWP/thread that got it.  */
-ptid_t trap_ptid;
-\f
-
 /* Since we cannot wait (in linux_nat_wait) for the initial process and
    any cloned processes with a single call to waitpid, we have to use
    the WNOHANG flag and call waitpid in a loop.  To optimize
@@ -1404,8 +1399,6 @@ linux_nat_detach (char *args, int from_t
 			  target_pid_to_str (lwp_list->ptid));
     }
 
-  trap_ptid = null_ptid;
-
   /* Destroy LWP info; it's no longer valid.  */
   init_lwp_list ();
 
@@ -2777,14 +2770,11 @@ retry:
 
   if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
     {
-      trap_ptid = lp->ptid;
       if (debug_linux_nat)
 	fprintf_unfiltered (gdb_stdlog,
-			    "LLW: trap_ptid is %s.\n",
-			    target_pid_to_str (trap_ptid));
+			    "LLW: trap ptid is %s.\n",
+			    target_pid_to_str (lp->ptid));
     }
-  else
-    trap_ptid = null_ptid;
 
   if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
     {
@@ -2916,8 +2906,6 @@ linux_nat_kill (void)
 static void
 linux_nat_mourn_inferior (void)
 {
-  trap_ptid = null_ptid;
-
   /* Destroy LWP info; it's no longer valid.  */
   init_lwp_list ();
 
Index: src/gdb/linux-thread-db.c
===================================================================
--- src.orig/gdb/linux-thread-db.c	2008-05-15 17:54:23.000000000 +0100
+++ src/gdb/linux-thread-db.c	2008-05-15 17:55:58.000000000 +0100
@@ -823,8 +823,6 @@ check_event (ptid_t ptid)
 static ptid_t
 thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
 {
-  extern ptid_t trap_ptid;
-
   ptid = target_beneath->to_wait (ptid, ourstatus);
 
   if (ourstatus->kind == TARGET_WAITKIND_IGNORE)
@@ -861,9 +859,6 @@ thread_db_wait (ptid_t ptid, struct targ
 	 event gets postponed by other simultaneous events.  In such a
 	 case, we want to just ignore the event and continue on.  */
 
-      if (!ptid_equal (trap_ptid, null_ptid))
-	trap_ptid = thread_from_lwp (trap_ptid);
-
       ptid = thread_from_lwp (ptid);
       if (GET_PID (ptid) == -1)
 	ourstatus->kind = TARGET_WAITKIND_SPURIOUS;