[PATCH v2 4/6] Share parts of gdb/gdbthread.h with gdbserver

[Sergio Durigan Junior <sergiodj@redhat.com>]

Again, it was necessary to share a few functions declared on
gdb/gdbthread.h with gdbserver, because they are needed by
fork_inferior.  I decided to implement them on
gdb/gdbserver/inferiors.c because that's where the thread functions
are also implemented on gdbserver.  Some of these functions do not
need to be implemented on gdbserver, or don't make sense there, so
they are left blank and commented properly.

gdb/ChangeLog:
2017-01-17  Sergio Durigan Junior  <sergiodj@redhat.com>

	* Makefile.in (HFILES_NO_SRCDIR): Add "common/common-gdbthread.h".
	* common/common-gdbthread.h: New file, with parts from
	"gdb/gdbthread.h".
	* fork-child.c (fork_inferior): Update call of "set_executing".
	* gdbthread.h: Include "common-gdbthread.h".
	(init_thread_list): Moved to "common/common-gdbthread.h".
	(add_thread_silent): Likewise.
	(switch_to_thread): Likewise.
	(set_executing): Likewise.
	* thread.c (set_executing): Update function comment.

gdb/gdbserver/ChangeLog:
2017-01-17  Sergio Durigan Junior  <sergiodj@redhat.com>

	* inferiors.c (init_thread_list): New function.
	(switch_to_thread): Likewise.
	(set_executing): Likewise.
	(add_thread_silent): Likewise.
	* server.c (get_last_target_waitstatus): Likewise.
	* server.h (get_last_target_waitstatus): Likewise.
---
 gdb/Makefile.in               |  1 +
 gdb/common/common-gdbthread.h | 45 +++++++++++++++++++++++++++++++++++++++++++
 gdb/gdbserver/inferiors.c     | 41 +++++++++++++++++++++++++++++++++++++++
 gdb/gdbserver/server.c        |  8 ++++++++
 gdb/gdbserver/server.h        |  3 +++
 gdb/gdbthread.h               | 20 +------------------
 gdb/thread.c                  |  2 ++
 7 files changed, 101 insertions(+), 19 deletions(-)
 create mode 100644 gdb/common/common-gdbthread.h

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index c0325d5..3e49e6e 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1467,6 +1467,7 @@ HFILES_NO_SRCDIR = \
 	common/common-debug.h \
 	common/common-defs.h \
 	common/common-exceptions.h \
+	common/common-gdbthread.h \
 	common/common-regcache.h \
 	common/common-types.h \
 	common/common-utils.h \
diff --git a/gdb/common/common-gdbthread.h b/gdb/common/common-gdbthread.h
new file mode 100644
index 0000000..eb66de9
--- /dev/null
+++ b/gdb/common/common-gdbthread.h
@@ -0,0 +1,45 @@
+/* Common multi-process/thread control defs for GDB and gdbserver.
+   Copyright (C) 1987-2017 Free Software Foundation, Inc.
+   Contributed by Lynx Real-Time Systems, Inc.  Los Gatos, CA.
+   
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef COMMON_THREAD_H
+#define COMMON_THREAD_H
+
+struct target_waitstatus;
+
+/* Create an empty thread list, or empty the existing one.  */
+extern void init_thread_list (void);
+
+/* Switch from one thread to another.  */
+extern void switch_to_thread (ptid_t ptid);
+
+/* Marks thread PTID as executing, or not.  If PTID is minus_one_ptid,
+   marks all threads.
+
+   Note that this is different from the running state.  See the
+   description of state and executing fields of struct
+   thread_info.  */
+extern void set_executing (ptid_t ptid, int executing);
+
+/* Add a thread to the thread list and return the pointer to the new
+   thread.  Caller may use this pointer to initialize the private
+   thread data.  */
+extern struct thread_info *add_thread_silent (ptid_t ptid);
+
+#endif /* ! COMMON_THREAD_H */
diff --git a/gdb/gdbserver/inferiors.c b/gdb/gdbserver/inferiors.c
index b65a726..441ec2c 100644
--- a/gdb/gdbserver/inferiors.c
+++ b/gdb/gdbserver/inferiors.c
@@ -468,3 +468,44 @@ make_cleanup_restore_current_thread (void)
 {
   return make_cleanup (do_restore_current_thread_cleanup, current_thread);
 }
+
+/* See common/common-gdbthread.h.  */
+
+void
+init_thread_list (void)
+{
+  /* To be implemented.  */
+}
+
+/* See common/common-gdbthread.h.  */
+
+void
+switch_to_thread (ptid_t ptid)
+{
+  if (!ptid_equal (ptid, minus_one_ptid))
+    current_thread = find_thread_ptid (ptid);
+}
+
+/* See common/common-gdbthread.h.  */
+
+void
+set_executing (ptid_t ptid ATTRIBUTE_UNUSED, int executing ATTRIBUTE_UNUSED)
+{
+  gdb_assert (current_thread != NULL);
+  current_thread->last_resume_kind = resume_stop;
+  current_thread->last_status = get_last_target_waitstatus ();
+}
+
+/* See common/common-gdbthread.h.  */
+
+struct thread_info *
+add_thread_silent (ptid_t ptid)
+{
+  pid_t pid = ptid_get_pid (ptid);
+
+  /* Check if there is a process already.  */
+  if (find_process_pid (pid) == NULL)
+    add_process (pid, 0);
+
+  return add_thread (ptid_build (pid, pid, 0), NULL);
+}
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index 4bc7f71..43d9406 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -236,6 +236,14 @@ target_running (void)
   return get_first_thread () != NULL;
 }
 
+/* See server.h.  */
+
+struct target_waitstatus
+get_last_target_waitstatus (void)
+{
+  return last_status;
+}
+
 static int
 start_inferior (char **argv)
 {
diff --git a/gdb/gdbserver/server.h b/gdb/gdbserver/server.h
index d5fee38..71848f1 100644
--- a/gdb/gdbserver/server.h
+++ b/gdb/gdbserver/server.h
@@ -148,4 +148,7 @@ extern int in_queued_stop_replies (ptid_t ptid);
 /* Definition for any syscall, used for unfiltered syscall reporting.  */
 #define ANY_SYSCALL (-2)
 
+/* Return the global variable LAST_STATUS from server.c.  */
+extern struct target_waitstatus get_last_target_waitstatus (void);
+
 #endif /* SERVER_H */
diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
index 455cfd8..b4d3499 100644
--- a/gdb/gdbthread.h
+++ b/gdb/gdbthread.h
@@ -31,6 +31,7 @@ struct symtab;
 #include "common/vec.h"
 #include "target/waitstatus.h"
 #include "cli/cli-utils.h"
+#include "common-gdbthread.h"
 
 /* Frontend view of the thread state.  Possible extensions: stepping,
    finishing, until(ling),...  */
@@ -344,19 +345,12 @@ struct thread_info
   struct thread_info *step_over_next;
 };
 
-/* Create an empty thread list, or empty the existing one.  */
-extern void init_thread_list (void);
-
 /* Add a thread to the thread list, print a message
    that a new thread is found, and return the pointer to
    the new thread.  Caller my use this pointer to 
    initialize the private thread data.  */
 extern struct thread_info *add_thread (ptid_t ptid);
 
-/* Same as add_thread, but does not print a message
-   about new thread.  */
-extern struct thread_info *add_thread_silent (ptid_t ptid);
-
 /* Same as add_thread, and sets the private info.  */
 extern struct thread_info *add_thread_with_info (ptid_t ptid,
 						 struct private_thread_info *);
@@ -469,10 +463,6 @@ extern struct thread_info *iterate_over_threads (thread_callback_func, void *);
 
 extern int thread_count (void);
 
-/* Switch from one thread to another.  Also sets the STOP_PC
-   global.  */
-extern void switch_to_thread (ptid_t ptid);
-
 /* Switch from one thread to another.  Does not read registers and
    sets STOP_PC to -1.  */
 extern void switch_to_thread_no_regs (struct thread_info *thread);
@@ -518,14 +508,6 @@ extern int is_exited (ptid_t ptid);
 /* In the frontend's perpective, is this thread stopped?  */
 extern int is_stopped (ptid_t ptid);
 
-/* Marks thread PTID as executing, or not.  If PTID is minus_one_ptid,
-   marks all threads.
-
-   Note that this is different from the running state.  See the
-   description of state and executing fields of struct
-   thread_info.  */
-extern void set_executing (ptid_t ptid, int executing);
-
 /* Reports if thread PTID is executing.  */
 extern int is_executing (ptid_t ptid);
 
diff --git a/gdb/thread.c b/gdb/thread.c
index e45b257..d159855 100644
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -1011,6 +1011,8 @@ is_executing (ptid_t ptid)
   return tp->executing;
 }
 
+/* See common/common-gdbthread.h.  */
+
 void
 set_executing (ptid_t ptid, int executing)
 {
-- 
2.9.3