Introduce basic LWP accessors

This commit introduces three accessors that shared Linux code can
use to access fields of struct lwp_info.  The GDB and gdbserver
Linux x86 code is modified to use them.

gdb/ChangeLog:

	* nat/linux-nat.h (ptid_of_lwp): New declaration.
	(lwp_is_stopped): Likewise.
	(lwp_stop_reason): Likewise.
	* linux-nat.c (ptid_of_lwp): New function.
	(lwp_is_stopped): Likewise.
	(lwp_is_stopped_by_watchpoint): Likewise.
	* x86-linux-nat.c (update_debug_registers_callback):
	Use lwp_is_stopped.
	(x86_linux_prepare_to_resume): Use ptid_of_lwp and
	lwp_stop_reason.

gdb/gdbserver/ChangeLog:

	* linux-low.c (ptid_of_lwp): New function.
	(lwp_is_stopped): Likewise.
	(lwp_stop_reason): Likewise.
	* linux-x86-low.c (update_debug_registers_callback):
	Use lwp_is_stopped.
	(x86_linux_prepare_to_resume): Use ptid_of_lwp and
	lwp_stop_reason.

1 files changed, 27 insertions, 0 deletions

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 5a2cba5..283a12b 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -282,6 +282,33 @@ static int sigtrap_is_event (int status);
 static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event;
 
 
+/* LWP accessors.  */
+
+/* See nat/linux-nat.h.  */
+
+ptid_t
+ptid_of_lwp (struct lwp_info *lwp)
+{
+  return lwp->ptid;
+}
+
+/* See nat/linux-nat.h.  */
+
+int
+lwp_is_stopped (struct lwp_info *lwp)
+{
+  return lwp->stopped;
+}
+
+/* See nat/linux-nat.h.  */
+
+enum target_stop_reason
+lwp_stop_reason (struct lwp_info *lwp)
+{
+  return lwp->stop_reason;
+}
+
+
 /* Trivial list manipulation functions to keep track of a list of
    new stopped processes.  */
 static void