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
|
/**
* 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/db/s/sharding_migration_critical_section.h"
namespace mongo {
namespace {
std::string getMessageMismatchReason(const std::string& action,
const BSONObj& newReason,
const BSONObj& existingReason) {
return str::stream() << "trying to " << action << " a critical section with reason "
<< newReason
<< " but it was already taken by another operation with different reason "
<< existingReason << ".";
}
std::string getMessageNotAcquired(const std::string& action, const BSONObj& newReason) {
return str::stream() << "Trying to " << action << " a critical section with reason "
<< newReason << " but it was not acquired first.";
}
} // namespace
ShardingMigrationCriticalSection::ShardingMigrationCriticalSection() = default;
ShardingMigrationCriticalSection::~ShardingMigrationCriticalSection() {
invariant(!_critSecCtx);
}
void ShardingMigrationCriticalSection::enterCriticalSectionCatchUpPhase(const BSONObj& reason) {
if (_critSecCtx && _critSecCtx->reason.woCompare(reason) == 0)
return;
invariant(!_critSecCtx, getMessageMismatchReason("acquire", reason, _critSecCtx->reason));
_critSecCtx.emplace(reason.getOwned());
}
void ShardingMigrationCriticalSection::enterCriticalSectionCommitPhase(const BSONObj& reason) {
invariant(_critSecCtx, getMessageNotAcquired("promote", reason));
invariant(_critSecCtx->reason.woCompare(reason) == 0,
getMessageMismatchReason("promote", reason, _critSecCtx->reason));
_critSecCtx->readsShouldWaitOnCritSec = true;
}
void ShardingMigrationCriticalSection::exitCriticalSection(const BSONObj& reason) {
invariant(!_critSecCtx || _critSecCtx->reason.woCompare(reason) == 0,
getMessageMismatchReason("release", reason, _critSecCtx->reason));
exitCriticalSectionNoChecks();
}
void ShardingMigrationCriticalSection::exitCriticalSectionNoChecks() {
if (!_critSecCtx)
return;
_critSecCtx->critSecSignal.emplaceValue();
_critSecCtx.reset();
}
void ShardingMigrationCriticalSection::rollbackCriticalSectionCommitPhaseToCatchUpPhase(
const BSONObj& reason) {
invariant(_critSecCtx, getMessageNotAcquired("rollbackToCatchUp", reason));
invariant(_critSecCtx->reason.woCompare(reason) == 0,
getMessageMismatchReason("rollbackToCatchUp", reason, _critSecCtx->reason));
_critSecCtx->readsShouldWaitOnCritSec = false;
}
boost::optional<SharedSemiFuture<void>> ShardingMigrationCriticalSection::getSignal(
Operation op) const {
if (!_critSecCtx)
return boost::none;
if (op == kWrite || _critSecCtx->readsShouldWaitOnCritSec)
return _critSecCtx->critSecSignal.getFuture();
return boost::none;
}
boost::optional<BSONObj> ShardingMigrationCriticalSection::getReason() const {
if (!_critSecCtx)
return boost::none;
return _critSecCtx->reason;
}
} // namespace mongo
|