[RFA 2/9] Remove make_cleanup_restore_current_thread from gdbserver

[Tom Tromey <tom@tromey.com>]

This removes make_cleanup_restore_current_thread from gdbserver,
replacing it with a use of scoped_restore.

2018-02-07  Tom Tromey  <tom@tromey.com>

	* linux-low.c (install_software_single_step_breakpoints): Use
	make_scoped_restore.
	* inferiors.c (make_cleanup_restore_current_thread): Remove.
	(do_restore_current_thread_cleanup): Remove.
	* gdbthread.h (make_cleanup_restore_current_thread): Don't
	declare.
---
 gdb/gdbserver/ChangeLog   |  9 +++++++++
 gdb/gdbserver/gdbthread.h |  3 ---
 gdb/gdbserver/inferiors.c | 12 ------------
 gdb/gdbserver/linux-low.c |  6 +++---
 4 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 902ee7c7fd..0213edb1ee 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,5 +1,14 @@
 2018-02-07  Tom Tromey  <tom@tromey.com>
 
+	* linux-low.c (install_software_single_step_breakpoints): Use
+	make_scoped_restore.
+	* inferiors.c (make_cleanup_restore_current_thread): Remove.
+	(do_restore_current_thread_cleanup): Remove.
+	* gdbthread.h (make_cleanup_restore_current_thread): Don't
+	declare.
+
+2018-02-07  Tom Tromey  <tom@tromey.com>
+
 	* mem-break.c (set_raw_breakpoint_at): Use
 	gdb::unique_xmalloc_ptr.
 
diff --git a/gdb/gdbserver/gdbthread.h b/gdb/gdbserver/gdbthread.h
index 9a8c72e780..0edf870c56 100644
--- a/gdb/gdbserver/gdbthread.h
+++ b/gdb/gdbserver/gdbthread.h
@@ -224,7 +224,4 @@ lwpid_of (const thread_info *thread)
   return thread->id.lwp ();
 }
 
-/* Create a cleanup to restore current_thread.  */
-struct cleanup *make_cleanup_restore_current_thread (void);
-
 #endif /* GDB_THREAD_H */
diff --git a/gdb/gdbserver/inferiors.c b/gdb/gdbserver/inferiors.c
index 600bf201bf..ad3df648f5 100644
--- a/gdb/gdbserver/inferiors.c
+++ b/gdb/gdbserver/inferiors.c
@@ -213,18 +213,6 @@ current_process (void)
   return get_thread_process (current_thread);
 }
 
-static void
-do_restore_current_thread_cleanup (void *arg)
-{
-  current_thread = (struct thread_info *) arg;
-}
-
-struct cleanup *
-make_cleanup_restore_current_thread (void)
-{
-  return make_cleanup (do_restore_current_thread_cleanup, current_thread);
-}
-
 /* See common/common-gdbthread.h.  */
 
 void
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 38142bba03..b6b660ea96 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -50,6 +50,7 @@
 #include "common-inferior.h"
 #include "nat/fork-inferior.h"
 #include "environ.h"
+#include "common/scoped_restore.h"
 #ifndef ELFMAG0
 /* Don't include <linux/elf.h> here.  If it got included by gdb_proc_service.h
    then ELFMAG0 will have been defined.  If it didn't get included by
@@ -4207,15 +4208,14 @@ install_software_single_step_breakpoints (struct lwp_info *lwp)
 {
   struct thread_info *thread = get_lwp_thread (lwp);
   struct regcache *regcache = get_thread_regcache (thread, 1);
-  struct cleanup *old_chain = make_cleanup_restore_current_thread ();
+
+  scoped_restore save_current_thread = make_scoped_restore (&current_thread);
 
   current_thread = thread;
   std::vector<CORE_ADDR> next_pcs = the_low_target.get_next_pcs (regcache);
 
   for (CORE_ADDR pc : next_pcs)
     set_single_step_breakpoint (pc, current_ptid);
-
-  do_cleanups (old_chain);
 }
 
 /* Single step via hardware or software single step.
-- 
2.13.6