From 0ec9a092fd18d6b1c38ae330194bf90534a9b681 Mon Sep 17 00:00:00 2001
From: Daniel Jacobowitz <drow@false.org>
Date: Thu, 30 Mar 2006 16:34:23 +0000
Subject: 	* linux-thread-db.c: Include "linux-nat.h". 
 (check_for_thread_db): New function, split out from 	thread_db_new_objfile.
  Remove dead check for active 	thread_db on inapplicable targets. 
 (thread_db_new_objfile): Call check_for_thread_db. 	* Makefile.in
 (linux-thread-db.o): Update. 	* linux-nat.c (child_post_attach): Call
 check_for_thread_db. 	(linux_child_post_startup_inferior): Likewise. 
 (lin_lwp_attach_lwp): Call target_post_attach instead of 
 child_post_attach. 	* linux-nat.h (check_for_thread_db): New prototype.

---
 gdb/linux-thread-db.c | 77 +++++++++++++++++++++++++--------------------------
 1 file changed, 37 insertions(+), 40 deletions(-)

(limited to 'gdb/linux-thread-db.c')

diff --git a/gdb/linux-thread-db.c b/gdb/linux-thread-db.c
index 1291480..981bc06 100644
--- a/gdb/linux-thread-db.c
+++ b/gdb/linux-thread-db.c
@@ -37,6 +37,7 @@
 #include "regcache.h"
 #include "solib-svr4.h"
 #include "gdbcore.h"
+#include "linux-nat.h"
 
 #ifdef HAVE_GNU_LIBC_VERSION_H
 #include <gnu/libc-version.h>
@@ -626,59 +627,49 @@ check_thread_signals (void)
 #endif
 }
 
-static void
-thread_db_new_objfile (struct objfile *objfile)
+/* Check whether thread_db is usable.  This function is called when
+   an inferior is created (or otherwise acquired, e.g. attached to)
+   and when new shared libraries are loaded into a running process.  */
+
+void
+check_for_thread_db (void)
 {
   td_err_e err;
+  static int already_loaded;
 
   /* First time through, report that libthread_db was successfuly
      loaded.  Can't print this in in thread_db_load as, at that stage,
-     the interpreter and it's console haven't started.  The real
-     problem here is that libthread_db is loaded too early - it should
-     only be loaded when there is a program to debug.  */
-  {
-    static int dejavu;
-    if (!dejavu)
-      {
-	Dl_info info;
-	const char *library = NULL;
-	/* Try dladdr.  */
-	if (dladdr ((*td_ta_new_p), &info) != 0)
-	  library = info.dli_fname;
-	/* Try dlinfo?  */
-	if (library == NULL)
-	  /* Paranoid - don't let a NULL path slip through.  */
-	  library = LIBTHREAD_DB_SO;
-	printf_unfiltered (_("Using host libthread_db library \"%s\".\n"),
-			   library);
-	dejavu = 1;
-      }
-  }
+     the interpreter and it's console haven't started.  */
 
-  /* Don't attempt to use thread_db on targets which can not run
-     (core files).  */
-  if (objfile == NULL || !target_has_execution)
+  if (!already_loaded)
     {
-      /* All symbols have been discarded.  If the thread_db target is
-         active, deactivate it now.  */
-      if (using_thread_db)
-	{
-	  gdb_assert (proc_handle.pid == 0);
-	  unpush_target (&thread_db_ops);
-	  using_thread_db = 0;
-	}
+      Dl_info info;
+      const char *library = NULL;
+      if (dladdr ((*td_ta_new_p), &info) != 0)
+	library = info.dli_fname;
+
+      /* Try dlinfo?  */
+
+      if (library == NULL)
+	/* Paranoid - don't let a NULL path slip through.  */
+	library = LIBTHREAD_DB_SO;
 
-      goto quit;
+      printf_unfiltered (_("Using host libthread_db library \"%s\".\n"),
+			 library);
+      already_loaded = 1;
     }
 
   if (using_thread_db)
     /* Nothing to do.  The thread library was already detected and the
        target vector was already activated.  */
-    goto quit;
+    return;
 
-  /* Initialize the structure that identifies the child process.  Note
-     that at this point there is no guarantee that we actually have a
-     child process.  */
+  /* Don't attempt to use thread_db on targets which can not run
+     (executables not running yet, core files) for now.  */
+  if (!target_has_execution)
+    return;
+
+  /* Initialize the structure that identifies the child process.  */
   proc_handle.pid = GET_PID (inferior_ptid);
 
   /* Now attempt to open a connection to the thread library.  */
@@ -705,8 +696,14 @@ thread_db_new_objfile (struct objfile *objfile)
 	       thread_db_err_str (err));
       break;
     }
+}
+
+static void
+thread_db_new_objfile (struct objfile *objfile)
+{
+  if (objfile != NULL)
+    check_for_thread_db ();
 
-quit:
   if (target_new_objfile_chain)
     target_new_objfile_chain (objfile);
 }
-- 
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