gdb/

	* gdbthread.h (currently_stepping): New declaration.
	* infrun.c (currently_stepping): Remove the forward declaration.
	(currently_stepping): Make it global.
	* linux-nat.c (resume_callback) <lp->stopped && lp->status == 0>: New
	variables tp and step, initialized them.  Pass STEP to to_resume.
	Print also possibly "PTRACE_SINGLESTEP" if STEP.  Initialize LP->STEP.
	* remote.c (currently_stepping_callback): New.
	(remote_vcont_resume)
	<ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)>:
	New variable tp.  Call currently_stepping_callback and step such
	thread.

gdb/testsuite/
	* gdb.threads/sigstep-threads.exp: New file.
	* gdb.threads/sigstep-threads.c: New file.

1 files changed, 14 insertions, 0 deletions

diff --git a/gdb/remote.c b/gdb/remote.c
index d6c20f3..13a9635 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -4416,6 +4416,12 @@ append_resumption (char *p, char *endp,
   return p;
 }
 
+static int
+currently_stepping_callback (struct thread_info *tp, void *data)
+{
+  return currently_stepping (tp);
+}
+
 /* Resume the remote inferior by using a "vCont" packet.  The thread
    to be resumed is PTID; STEP and SIGGNAL indicate whether the
    resumed thread should be single-stepped and/or signalled.  If PTID
@@ -4458,6 +4464,8 @@ remote_vcont_resume (ptid_t ptid, int step, enum target_signal siggnal)
     }
   else if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid))
     {
+      struct thread_info *tp;
+
       /* Resume all threads (of all processes, or of a single
 	 process), with preference for INFERIOR_PTID.  This assumes
 	 inferior_ptid belongs to the set of all threads we are about
@@ -4468,6 +4476,12 @@ remote_vcont_resume (ptid_t ptid, int step, enum target_signal siggnal)
 	  p = append_resumption (p, endp, inferior_ptid, step, siggnal);
 	}
 
+      tp = iterate_over_threads (currently_stepping_callback, NULL);
+      if (tp && !ptid_equal (tp->ptid, inferior_ptid))
+	{
+	  p = append_resumption (p, endp, tp->ptid, 1, TARGET_SIGNAL_0);
+	}
+
       /* And continue others without a signal.  */
       p = append_resumption (p, endp, ptid, /*step=*/ 0, TARGET_SIGNAL_0);
     }