* arch-utils.c (generic_prepare_to_proceed): Allow for having

stopped due to a Ctrl-C as well as breakpoints.

* hppa-tdep.c (hppa_prepare_to_proceed): Add FIXME as this may not
support thread switches after Ctrl-C.
* lin-lwp.c (lin_lwp_prepare_to_proceed): Ditto.
* linux-thread.c (linuxthreads_prepare_to_proceed): Ditto.
* m3-nat.c (mach3_prepare_to_proceed): Ditto.

6 files changed, 39 insertions, 12 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ffa0147..6fa1a5c 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,14 @@
+2001-06-06  Jonathan Larmour  <jlarmour@redhat.com>
+
+	* arch-utils.c (generic_prepare_to_proceed): Allow for having
+	stopped due to a Ctrl-C as well as breakpoints.
+
+	* hppa-tdep.c (hppa_prepare_to_proceed): Add FIXME as this may not
+	support thread switches after Ctrl-C.
+	* lin-lwp.c (lin_lwp_prepare_to_proceed): Ditto.
+	* linux-thread.c (linuxthreads_prepare_to_proceed): Ditto.
+	* m3-nat.c (mach3_prepare_to_proceed): Ditto.
+
 2001-06-06  Jim Blandy  <jimb@redhat.com>
 
 	* gdbarch.sh, gdbarch.c: Revert change of 2001-06-01; all
diff --git a/gdb/arch-utils.c b/gdb/arch-utils.c
index de977dd..733b2b9 100644
--- a/gdb/arch-utils.c
+++ b/gdb/arch-utils.c
@@ -258,9 +258,11 @@ generic_prepare_to_proceed (int select_it)
   /* Get the last target status returned by target_wait().  */
   get_last_target_status (&wait_ptid, &wait_status);
 
-  /* Make sure we were stopped at a breakpoint.  */
+  /* Make sure we were stopped either at a breakpoint, or because
+     of a Ctrl-C.  */
   if (wait_status.kind != TARGET_WAITKIND_STOPPED
-      || wait_status.value.sig != TARGET_SIGNAL_TRAP)
+      || (wait_status.value.sig != TARGET_SIGNAL_TRAP &&
+          wait_status.value.sig != TARGET_SIGNAL_INT))
     {
       return 0;
     }
@@ -271,14 +273,11 @@ generic_prepare_to_proceed (int select_it)
       /* Switched over from WAIT_PID.  */
       CORE_ADDR wait_pc = read_pc_pid (wait_ptid);
 
-      /* Avoid switching where it wouldn't do any good, i.e. if both
-         threads are at the same breakpoint.  */
-      if (wait_pc != read_pc () && breakpoint_here_p (wait_pc))
+      if (wait_pc != read_pc ())
 	{
 	  if (select_it)
 	    {
-	      /* User hasn't deleted the breakpoint.  Switch back to
-		 WAIT_PID and return non-zero.  */
+	      /* Switch back to WAIT_PID thread.  */
 	      inferior_ptid = wait_ptid;
 
 	      /* FIXME: This stuff came from switch_to_thread() in
@@ -288,8 +287,13 @@ generic_prepare_to_proceed (int select_it)
 	      stop_pc = wait_pc;
 	      select_frame (get_current_frame (), 0);
 	    }
-
-	  return 1;
+          /* We return 1 to indicate that there is a breakpoint here,
+             so we need to step over it before continuing to avoid
+             hitting it straight away. */
+          if (breakpoint_here_p (wait_pc))
+            {
+	      return 1;
+            }
 	}
     }
   return 0;
diff --git a/gdb/hppa-tdep.c b/gdb/hppa-tdep.c
index 072b0a4..1c28e87 100644
--- a/gdb/hppa-tdep.c
+++ b/gdb/hppa-tdep.c
@@ -4594,7 +4594,10 @@ unwind_command (char *exp, int from_tty)
    putting the BPT instruction in and taking it out.
 
    Note that this implementation is potentially redundant now that
-   default_prepare_to_proceed() has been added.  */
+   default_prepare_to_proceed() has been added.
+
+   FIXME This may not support switching threads after Ctrl-C
+   correctly. The default implementation does support this. */
 int
 hppa_prepare_to_proceed (void)
 {
diff --git a/gdb/lin-lwp.c b/gdb/lin-lwp.c
index 280936e..0948a54 100644
--- a/gdb/lin-lwp.c
+++ b/gdb/lin-lwp.c
@@ -263,7 +263,10 @@ iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
    layer.
 
    Note that this implementation is potentially redundant now that
-   default_prepare_to_proceed() has been added.  */
+   default_prepare_to_proceed() has been added.
+
+   FIXME This may not support switching threads after Ctrl-C
+   correctly. The default implementation does support this. */
 
 int
 lin_lwp_prepare_to_proceed (void)
diff --git a/gdb/linux-thread.c b/gdb/linux-thread.c
index 62c07c4..f93387b 100644
--- a/gdb/linux-thread.c
+++ b/gdb/linux-thread.c
@@ -1040,7 +1040,10 @@ quit:
    return 1 otherwise 0.
 
    Note that this implementation is potentially redundant now that
-   default_prepare_to_proceed() has been added.  */
+   default_prepare_to_proceed() has been added.
+
+   FIXME This may not support switching threads after Ctrl-C
+   correctly. The default implementation does support this. */
 
 int
 linuxthreads_prepare_to_proceed (int step)
diff --git a/gdb/m3-nat.c b/gdb/m3-nat.c
index 3ab160b..d01e22c 100644
--- a/gdb/m3-nat.c
+++ b/gdb/m3-nat.c
@@ -1575,6 +1575,9 @@ mach_thread_output_id (int mid)
  *
  * Note that this implementation is potentially redundant now that
  * default_prepare_to_proceed() has been added.  
+ *
+ * FIXME This may not support switching threads after Ctrl-C
+ * correctly. The default implementation does support this.
  */
 
 mach3_prepare_to_proceed (int select_it)