[PATCH v8 4/6] gdb: introduce 'all_non_exited_process_targets' and 'switch_to_target_no_thread'

[Pedro Alves <palves@redhat.com>]

From: Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>

Introduce two new convenience functions:

1. all_non_exited_process_targets: returns a collection of all process
stratum targets that have non-exited inferiors on them.  Useful for
iterating targets.

2. switch_to_target_no_thread: switch the context to the first
inferior of the given target, and to no selected thread.

gdb/ChangeLog:
2020-04-30  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	* process-stratum-target.h: Include <set>.
	(all_non_exited_process_targets, switch_to_target_no_thread): New
	function declarations.
	* process-stratum-target.c (all_non_exited_process_targets)
	(switch_to_target_no_thread): New function implementations.
---
 gdb/process-stratum-target.c | 24 ++++++++++++++++++++++++
 gdb/process-stratum-target.h | 10 ++++++++++
 2 files changed, 34 insertions(+)

diff --git a/gdb/process-stratum-target.c b/gdb/process-stratum-target.c
index f3fd9ee905d..9fb358a6a9f 100644
--- a/gdb/process-stratum-target.c
+++ b/gdb/process-stratum-target.c
@@ -83,3 +83,27 @@ process_stratum_target::has_execution (inferior *inf)
      through hoops.  */
   return inf->pid != 0;
 }
+
+/* See process-stratum-target.h.  */
+
+std::set<process_stratum_target *>
+all_non_exited_process_targets ()
+{
+  std::set<process_stratum_target *> targets;
+  for (inferior *inf : all_non_exited_inferiors ())
+    targets.insert (inf->process_target ());
+
+  return targets;
+}
+
+/* See process-stratum-target.h.  */
+
+void
+switch_to_target_no_thread (process_stratum_target *target)
+{
+  for (inferior *inf : all_inferiors (target))
+    {
+      switch_to_inferior_no_thread (inf);
+      break;
+    }
+}
diff --git a/gdb/process-stratum-target.h b/gdb/process-stratum-target.h
index 1be02100dcf..7e7905bf750 100644
--- a/gdb/process-stratum-target.h
+++ b/gdb/process-stratum-target.h
@@ -21,6 +21,7 @@
 #define PROCESS_STRATUM_TARGET_H
 
 #include "target.h"
+#include <set>
 
 /* Abstract base class inherited by all process_stratum targets.  */
 
@@ -82,4 +83,13 @@ as_process_stratum_target (target_ops *target)
   return static_cast<process_stratum_target *> (target);
 }
 
+/* Return a collection of targets that have non-exited inferiors.  */
+
+extern std::set<process_stratum_target *> all_non_exited_process_targets ();
+
+/* Switch to the first inferior (and program space) of TARGET, and
+   switch to no thread selected.  */
+
+extern void switch_to_target_no_thread (process_stratum_target *target);
+
 #endif /* !defined (PROCESS_STRATUM_TARGET_H) */
-- 
2.14.5