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
120
121
122
123
124
125
126
127
128
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: no-threads
// UNSUPPORTED: c++03
// <future>
// class shared_future<R>
// template <class Clock, class Duration>
// future_status
// wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
#include <atomic>
#include <cassert>
#include <chrono>
#include <future>
#include "make_test_thread.h"
#include "test_macros.h"
enum class WorkerThreadState { Uninitialized, AllowedToRun, Exiting };
typedef std::chrono::milliseconds ms;
std::atomic<WorkerThreadState> thread_state(WorkerThreadState::Uninitialized);
void set_worker_thread_state(WorkerThreadState state)
{
thread_state.store(state, std::memory_order_relaxed);
}
void wait_for_worker_thread_state(WorkerThreadState state)
{
while (thread_state.load(std::memory_order_relaxed) != state)
std::this_thread::yield();
}
void func1(std::promise<int> p)
{
wait_for_worker_thread_state(WorkerThreadState::AllowedToRun);
p.set_value(3);
set_worker_thread_state(WorkerThreadState::Exiting);
}
int j = 0;
void func3(std::promise<int&> p)
{
wait_for_worker_thread_state(WorkerThreadState::AllowedToRun);
j = 5;
p.set_value(j);
set_worker_thread_state(WorkerThreadState::Exiting);
}
void func5(std::promise<void> p)
{
wait_for_worker_thread_state(WorkerThreadState::AllowedToRun);
p.set_value();
set_worker_thread_state(WorkerThreadState::Exiting);
}
int main(int, char**)
{
typedef std::chrono::high_resolution_clock Clock;
{
typedef int T;
std::promise<T> p;
std::shared_future<T> f = p.get_future();
support::make_test_thread(func1, std::move(p)).detach();
assert(f.valid());
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
assert(f.valid());
// allow the worker thread to produce the result and wait until the worker is done
set_worker_thread_state(WorkerThreadState::AllowedToRun);
wait_for_worker_thread_state(WorkerThreadState::Exiting);
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
assert(f.valid());
f.wait();
assert(f.valid());
}
{
typedef int& T;
std::promise<T> p;
std::shared_future<T> f = p.get_future();
support::make_test_thread(func3, std::move(p)).detach();
assert(f.valid());
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
assert(f.valid());
// allow the worker thread to produce the result and wait until the worker is done
set_worker_thread_state(WorkerThreadState::AllowedToRun);
wait_for_worker_thread_state(WorkerThreadState::Exiting);
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
assert(f.valid());
f.wait();
assert(f.valid());
}
{
typedef void T;
std::promise<T> p;
std::shared_future<T> f = p.get_future();
support::make_test_thread(func5, std::move(p)).detach();
assert(f.valid());
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
assert(f.valid());
// allow the worker thread to produce the result and wait until the worker is done
set_worker_thread_state(WorkerThreadState::AllowedToRun);
wait_for_worker_thread_state(WorkerThreadState::Exiting);
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
assert(f.valid());
f.wait();
assert(f.valid());
}
return 0;
}
|
