[RFC PATCH 11/12] fbsd-nat: Add a low_prepare_to_resume virtual method.

[John Baldwin <jhb@FreeBSD.org>]

This method can be overridden by architecture-specific targets to
perform additional work before a thread is resumed.
---
 gdb/fbsd-nat.c | 9 +++++++--
 gdb/fbsd-nat.h | 4 ++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 2bc7937a38b..934fdbad6ef 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -1138,6 +1138,8 @@ fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
 	    perror_with_name (request == PT_RESUME ?
 			      ("ptrace (PT_RESUME)") :
 			      ("ptrace (PT_SUSPEND)"));
+	  if (request == PT_RESUME)
+	    low_prepare_to_resume (tp);
 	}
     }
   else
@@ -1145,8 +1147,11 @@ fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
       /* If ptid is a wildcard, resume all matching threads (they won't run
 	 until the process is continued however).  */
       for (thread_info *tp : all_non_exited_threads (this, ptid))
-	if (ptrace (PT_RESUME, tp->ptid.lwp (), NULL, 0) == -1)
-	  perror_with_name (("ptrace (PT_RESUME)"));
+	{
+	  if (ptrace (PT_RESUME, tp->ptid.lwp (), NULL, 0) == -1)
+	    perror_with_name (("ptrace (PT_RESUME)"));
+	  low_prepare_to_resume (tp);
+	}
       ptid = inferior_ptid;
     }
 
diff --git a/gdb/fbsd-nat.h b/gdb/fbsd-nat.h
index 6028aebfccc..82f7ee47949 100644
--- a/gdb/fbsd-nat.h
+++ b/gdb/fbsd-nat.h
@@ -119,6 +119,10 @@ class fbsd_nat_target : public inf_ptrace_target
   virtual void low_delete_thread (thread_info *)
   {}
 
+  /* Hook to call prior to resuming a thread.  */
+  virtual void low_prepare_to_resume (thread_info *)
+  {}
+
 protected:
 
   void post_startup_inferior (ptid_t) override;
-- 
2.34.1