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
|
#pragma once
/* Copyright (c) 2016 Stanislaw Halik
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#include <thread>
#include <condition_variable>
#include <utility>
#include <QObject>
#include <QThread>
namespace impl_run_in_thread {
struct semaphore final
{
using lock_guard = std::unique_lock<std::mutex>;
std::mutex mtx;
std::condition_variable cvar;
bool flag = false;
semaphore() = default;
void wait()
{
lock_guard guard(mtx);
while (!flag)
cvar.wait(guard);
}
void notify()
{
lock_guard guard(mtx);
flag = true;
cvar.notify_one();
}
};
}
template<typename F>
void run_in_thread_sync(QObject* obj, F&& fun)
{
if (obj->thread() == QThread::currentThread())
return (void)fun();
impl_run_in_thread::semaphore sem;
{
QObject src;
QObject::connect(&src, &QObject::destroyed,
obj, [&] { fun(); sem.notify(); },
Qt::QueuedConnection);
}
sem.wait();
}
template<typename F>
void run_in_thread_async(QObject* obj, F&& fun)
{
if (obj->thread() == QThread::currentThread())
return (void)fun();
QObject src;
QObject::connect(&src, &QObject::destroyed, obj, std::forward<F>(fun), Qt::QueuedConnection);
}
|
