aboutsummaryrefslogtreecommitdiff
path: root/gdb/run-on-main-thread.c
diff options
context:
space:
mode:
authorTom Tromey <tom@tromey.com>2019-03-08 15:51:06 -0700
committerTom Tromey <tom@tromey.com>2019-11-26 14:02:57 -0700
commit9411c49ecc09df989ecddb05e1756e0a9da0d1c8 (patch)
tree4dd8b5100ccc851fddfcdf95062dd5a6b4578aa6 /gdb/run-on-main-thread.c
parentc3efb9654847822620010922cb7ea61e8901479c (diff)
downloadgdb-9411c49ecc09df989ecddb05e1756e0a9da0d1c8.zip
gdb-9411c49ecc09df989ecddb05e1756e0a9da0d1c8.tar.gz
gdb-9411c49ecc09df989ecddb05e1756e0a9da0d1c8.tar.bz2
Introduce run_on_main_thread
This introduces a way for a callback to be run on the main thread. gdb/ChangeLog 2019-11-26 Tom Tromey <tom@tromey.com> * run-on-main-thread.c: New file. * run-on-main-thread.h: New file. * unittests/main-thread-selftests.c: New file. * Makefile.in (SUBDIR_UNITTESTS_SRCS): Add main-thread-selftests.c. (HFILES_NO_SRCDIR): Add run-on-main-thread.h. (COMMON_SFILES): Add run-on-main-thread.c. Change-Id: I16ef82f0564e9f8a524bdc64cb31df79a988ad9f
Diffstat (limited to 'gdb/run-on-main-thread.c')
-rw-r--r--gdb/run-on-main-thread.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/gdb/run-on-main-thread.c b/gdb/run-on-main-thread.c
new file mode 100644
index 0000000..86824b5
--- /dev/null
+++ b/gdb/run-on-main-thread.c
@@ -0,0 +1,97 @@
+/* Run a function on the main thread
+ Copyright (C) 2019 Free Software Foundation, Inc.
+
+ 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/>. */
+
+#include "defs.h"
+#include "run-on-main-thread.h"
+#include "ser-event.h"
+#if CXX_STD_THREAD
+#include <mutex>
+#endif
+#include "event-loop.h"
+
+/* The serial event used when posting runnables. */
+
+static struct serial_event *runnable_event;
+
+/* Runnables that have been posted. */
+
+static std::vector<std::function<void ()>> runnables;
+
+#if CXX_STD_THREAD
+
+/* Mutex to hold when handling RUNNABLE_EVENT or RUNNABLES. */
+
+static std::mutex runnable_mutex;
+
+#endif
+
+/* Run all the queued runnables. */
+
+static void
+run_events (int error, gdb_client_data client_data)
+{
+ std::vector<std::function<void ()>> local;
+
+ /* Hold the lock while changing the globals, but not while running
+ the runnables. */
+ {
+#if CXX_STD_THREAD
+ std::lock_guard<std::mutex> lock (runnable_mutex);
+#endif
+
+ /* Clear the event fd. Do this before flushing the events list,
+ so that any new event post afterwards is sure to re-awaken the
+ event loop. */
+ serial_event_clear (runnable_event);
+
+ /* Move the vector in case running a runnable pushes a new
+ runnable. */
+ local = std::move (runnables);
+ }
+
+ for (auto &item : local)
+ {
+ try
+ {
+ item ();
+ }
+ catch (...)
+ {
+ /* Ignore exceptions in the callback. */
+ }
+ }
+}
+
+/* See run-on-main-thread.h. */
+
+void
+run_on_main_thread (std::function<void ()> &&func)
+{
+#if CXX_STD_THREAD
+ std::lock_guard<std::mutex> lock (runnable_mutex);
+#endif
+ runnables.emplace_back (std::move (func));
+ serial_event_set (runnable_event);
+}
+
+void
+_initialize_run_on_main_thread ()
+{
+ runnable_event = make_serial_event ();
+ add_file_handler (serial_event_fd (runnable_event), run_events, nullptr);
+}