blob: eb22310f5c0fce241c8c2f36a4f8f5179249e344 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/* Run a function on the main thread
Copyright (C) 2019-2022 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 <thread>
#include <mutex>
#endif
#include "gdbsupport/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;
/* The main thread. */
static std::thread::id main_thread;
#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);
}
/* See run-on-main-thread.h. */
bool
is_main_thread ()
{
#if CXX_STD_THREAD
return std::this_thread::get_id () == main_thread;
#else
return true;
#endif
}
void _initialize_run_on_main_thread ();
void
_initialize_run_on_main_thread ()
{
#if CXX_STD_THREAD
main_thread = std::this_thread::get_id ();
#endif
runnable_event = make_serial_event ();
add_file_handler (serial_event_fd (runnable_event), run_events, nullptr,
"run-on-main-thread");
}
|
