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/**
* 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/concurrency/replication_state_transition_lock_guard.h"
#include "mongo/db/operation_context.h"
namespace mongo {
namespace repl {
ReplicationStateTransitionLockGuard::ReplicationStateTransitionLockGuard(OperationContext* opCtx,
LockMode mode)
: ReplicationStateTransitionLockGuard(opCtx, mode, EnqueueOnly()) {
waitForLockUntil(Date_t::max());
}
ReplicationStateTransitionLockGuard::ReplicationStateTransitionLockGuard(OperationContext* opCtx,
LockMode mode,
EnqueueOnly)
: _opCtx(opCtx), _mode(mode) {
_enqueueLock();
}
ReplicationStateTransitionLockGuard::~ReplicationStateTransitionLockGuard() {
_unlock();
}
void ReplicationStateTransitionLockGuard::waitForLockUntil(mongo::Date_t deadline) {
// We can return early if the lock request was already satisfied.
if (_result == LOCK_OK) {
return;
}
_result = LOCK_INVALID;
// Wait for the completion of the lock request for the RSTL.
_opCtx->lockState()->lockRSTLComplete(_opCtx, _mode, deadline);
_result = LOCK_OK;
}
void ReplicationStateTransitionLockGuard::release() {
_unlock();
}
void ReplicationStateTransitionLockGuard::reacquire() {
_enqueueLock();
waitForLockUntil(Date_t::max());
}
void ReplicationStateTransitionLockGuard::_enqueueLock() {
// Enqueue a lock request for the RSTL.
_result = _opCtx->lockState()->lockRSTLBegin(_opCtx, _mode);
}
void ReplicationStateTransitionLockGuard::_unlock() {
// If ReplicationStateTransitionLockGuard is called in a WriteUnitOfWork, we won't accept
// any exceptions to be thrown between _enqueueLock and waitForLockUntil because that would
// delay cleaning up any failed RSTL lock attempt state from lock manager.
invariant(!(_result == LOCK_WAITING && _opCtx->lockState()->inAWriteUnitOfWork()));
_opCtx->lockState()->unlock(resourceIdReplicationStateTransitionLock);
_result = LOCK_INVALID;
}
} // namespace repl
} // namespace mongo
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