1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// UNSUPPORTED: no-threads
10// UNSUPPORTED: c++03
11
12// <future>
13
14// class shared_future<R>
15
16// template <class Clock, class Duration>
17// future_status
18// wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
19
20#include <atomic>
21#include <cassert>
22#include <chrono>
23#include <future>
24
25#include "make_test_thread.h"
26#include "test_macros.h"
27
28enum class WorkerThreadState { Uninitialized, AllowedToRun, Exiting };
29typedef std::chrono::milliseconds ms;
30
31std::atomic<WorkerThreadState> thread_state(WorkerThreadState::Uninitialized);
32
33void set_worker_thread_state(WorkerThreadState state)
34{
35 thread_state.store(i: state, m: std::memory_order_relaxed);
36}
37
38void wait_for_worker_thread_state(WorkerThreadState state)
39{
40 while (thread_state.load(m: std::memory_order_relaxed) != state)
41 std::this_thread::yield();
42}
43
44void func1(std::promise<int> p)
45{
46 wait_for_worker_thread_state(state: WorkerThreadState::AllowedToRun);
47 p.set_value(3);
48 set_worker_thread_state(WorkerThreadState::Exiting);
49}
50
51int j = 0;
52
53void func3(std::promise<int&> p)
54{
55 wait_for_worker_thread_state(state: WorkerThreadState::AllowedToRun);
56 j = 5;
57 p.set_value(j);
58 set_worker_thread_state(WorkerThreadState::Exiting);
59}
60
61void func5(std::promise<void> p)
62{
63 wait_for_worker_thread_state(state: WorkerThreadState::AllowedToRun);
64 p.set_value();
65 set_worker_thread_state(WorkerThreadState::Exiting);
66}
67
68int main(int, char**)
69{
70 typedef std::chrono::high_resolution_clock Clock;
71
72 {
73 typedef int T;
74 std::promise<T> p;
75 std::shared_future<T> f = p.get_future();
76 support::make_test_thread(func1, std::move(p)).detach();
77 assert(f.valid());
78 assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
79 assert(f.valid());
80
81 // allow the worker thread to produce the result and wait until the worker is done
82 set_worker_thread_state(WorkerThreadState::AllowedToRun);
83 wait_for_worker_thread_state(state: WorkerThreadState::Exiting);
84
85 assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
86 assert(f.valid());
87 f.wait();
88 assert(f.valid());
89 }
90 {
91 typedef int& T;
92 std::promise<T> p;
93 std::shared_future<T> f = p.get_future();
94 support::make_test_thread(func3, std::move(p)).detach();
95 assert(f.valid());
96 assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
97 assert(f.valid());
98
99 // allow the worker thread to produce the result and wait until the worker is done
100 set_worker_thread_state(WorkerThreadState::AllowedToRun);
101 wait_for_worker_thread_state(state: WorkerThreadState::Exiting);
102
103 assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
104 assert(f.valid());
105 f.wait();
106 assert(f.valid());
107 }
108 {
109 typedef void T;
110 std::promise<T> p;
111 std::shared_future<T> f = p.get_future();
112 support::make_test_thread(func5, std::move(p)).detach();
113 assert(f.valid());
114 assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
115 assert(f.valid());
116
117 // allow the worker thread to produce the result and wait until the worker is done
118 set_worker_thread_state(WorkerThreadState::AllowedToRun);
119 wait_for_worker_thread_state(state: WorkerThreadState::Exiting);
120
121 assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
122 assert(f.valid());
123 f.wait();
124 assert(f.valid());
125 }
126
127 return 0;
128}
129

source code of libcxx/test/std/thread/futures/futures.shared_future/wait_until.pass.cpp