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
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/stdx/thread.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/interruptible.h"
#include "mongo/util/time_support.h"
namespace mongo {
namespace {
class DummyInterruptible final : public Interruptible {
Date_t getDeadline() const override {
MONGO_UNREACHABLE;
}
Status checkForInterruptNoAssert() noexcept override {
// Must be implemented because it's called by Interruptible::waitForConditionOrInterrupt.
return Status::OK();
}
IgnoreInterruptsState pushIgnoreInterrupts() override {
MONGO_UNREACHABLE;
}
void popIgnoreInterrupts(IgnoreInterruptsState iis) override {
MONGO_UNREACHABLE;
}
DeadlineState pushArtificialDeadline(Date_t deadline, ErrorCodes::Error error) override {
MONGO_UNREACHABLE;
}
void popArtificialDeadline(DeadlineState) override {
MONGO_UNREACHABLE;
}
Date_t getExpirationDateForWaitForValue(Milliseconds waitFor) override {
return Date_t::now() + waitFor;
}
StatusWith<stdx::cv_status> waitForConditionOrInterruptNoAssertUntil(
stdx::condition_variable& cv, BasicLockableAdapter m, Date_t deadline) noexcept override {
while (Date_t::now() < deadline) {
sleepmillis(duration_cast<Milliseconds>(precision).count());
}
return stdx::cv_status::timeout;
}
public:
const Milliseconds precision = Milliseconds(5);
};
TEST(Interruptible, WaitForConditionOrInterruptTimed) {
auto interruptible = std::make_unique<DummyInterruptible>();
const auto sleepFor = Milliseconds(500);
auto mutex = MONGO_MAKE_LATCH();
stdx::condition_variable cv;
stdx::unique_lock<Latch> lk(mutex);
AtomicWord<Microseconds::rep> waitTimer(0);
const auto start = Date_t::now();
Date_t deadline = Date_t::now() + sleepFor;
interruptible->waitForConditionOrInterruptUntil(cv,
lk,
deadline,
[&, oldWaitTimer = 0]() mutable {
/**
* Make sure it never resets the waitTimer.
* waitTimer should always monotonically
* increase.
*/
ASSERT_GTE(waitTimer.load(), oldWaitTimer);
oldWaitTimer = waitTimer.load();
return false;
},
&waitTimer);
const auto end = Date_t::now();
const auto duration = duration_cast<Milliseconds>(end - start);
ASSERT_GTE(duration + interruptible->precision, sleepFor);
/**
* The following assumes the testing environment is not heavily contended.
* So long as the OS scheduler does not take more than 5~ms to reschedule
* this thread, the following assertion should pass.
*/
ASSERT_LTE(duration_cast<Microseconds>(sleepFor).count(),
waitTimer.load() + duration_cast<Microseconds>(interruptible->precision).count());
ASSERT_FALSE(interruptible->isWaitingForConditionOrInterrupt());
}
TEST(Interruptible, ZeroWaitTimeForImmediateReturn) {
auto interruptible = std::make_unique<DummyInterruptible>();
auto mutex = MONGO_MAKE_LATCH();
stdx::condition_variable cv;
stdx::unique_lock<Latch> lk(mutex);
AtomicWord<Microseconds::rep> waitTimer(0);
Date_t deadline = Date_t::now() + Milliseconds(100);
interruptible->waitForConditionOrInterruptUntil(
cv, lk, deadline, [&]() { return true; }, &waitTimer);
ASSERT_EQ(waitTimer.load(), 0);
}
} // namespace
} // namespace mongo
|
