blob: ed2b364cef43c1a45d7295deced833b8a0eb1434 (
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
|
#ifndef MBGL_UTIL_RUN_LOOP
#define MBGL_UTIL_RUN_LOOP
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/util/std.hpp>
#include <mbgl/util/uv_detail.hpp>
#include <functional>
#include <queue>
#include <mutex>
namespace mbgl {
namespace util {
class RunLoop : private util::noncopyable {
public:
RunLoop(uv_loop_t*);
~RunLoop();
void stop();
// Invoke fn() in the runloop thread.
template <class Fn>
void invoke(Fn&& fn) {
auto invokable = util::make_unique<Invoker<Fn>>(std::move(fn));
withMutex([&] { queue.push(std::move(invokable)); });
async.send();
}
// Invoke fn() in the runloop thread, then invoke callback(result) in the current thread.
template <class Fn, class R>
void invokeWithResult(Fn&& fn, std::function<void (R)>&& callback) {
RunLoop* outer = current.get();
assert(outer);
invoke([fn = std::move(fn), callback = std::move(callback), outer] () mutable {
outer->invoke([callback = std::move(callback), result = std::move(fn())] () mutable {
callback(std::move(result));
});
});
}
// Invoke fn() in the runloop thread, then invoke callback() in the current thread.
template <class Fn>
void invokeWithResult(Fn&& fn, std::function<void ()>&& callback) {
RunLoop* outer = current.get();
assert(outer);
invoke([fn = std::move(fn), callback = std::move(callback), outer] () mutable {
fn();
outer->invoke(std::move(callback));
});
}
uv_loop_t* get() { return async.get()->loop; }
static uv::tls<RunLoop> current;
private:
// A movable type-erasing invokable entity wrapper. This allows to store arbitrary invokable
// things (like std::function<>, or the result of a movable-only std::bind()) in the queue.
// Source: http://stackoverflow.com/a/29642072/331379
struct Message {
virtual void operator()() = 0;
virtual ~Message() = default;
};
template <class F>
struct Invoker : Message {
Invoker(F&& f) : func(std::move(f)) {}
void operator()() override { func(); }
F func;
};
using Queue = std::queue<std::unique_ptr<Message>>;
void withMutex(std::function<void()>&&);
void process();
Queue queue;
std::mutex mutex;
uv::async async;
};
}
}
#endif
|
