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133 lines
2.9 KiB
133 lines
2.9 KiB
/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#pragma once
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#if !defined(_WIN32)
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#include <pthread.h>
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#endif // !_WIN32
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#include "paddle/fluid/platform/enforce.h"
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namespace paddle {
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namespace framework {
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#if !defined(_WIN32)
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struct RWLock {
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RWLock() { pthread_rwlock_init(&lock_, nullptr); }
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~RWLock() { pthread_rwlock_destroy(&lock_); }
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void RDLock() {
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PADDLE_ENFORCE_EQ(pthread_rwlock_rdlock(&lock_), 0,
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"acquire read lock failed");
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}
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void WRLock() {
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PADDLE_ENFORCE_EQ(pthread_rwlock_wrlock(&lock_), 0,
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"acquire write lock failed");
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}
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void UNLock() {
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PADDLE_ENFORCE_EQ(pthread_rwlock_unlock(&lock_), 0, "unlock failed");
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}
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private:
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pthread_rwlock_t lock_;
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};
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// TODO(paddle-dev): Support RWLock for WIN32 for correctness.
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#else
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// https://stackoverflow.com/questions/7125250/making-pthread-rwlock-wrlock-recursive
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// In windows, rw_lock seems like a hack. Use empty object and do nothing.
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struct RWLock {
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void RDLock() {}
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void WRLock() {}
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void UNLock() {}
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};
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#endif
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class RWLockGuard {
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public:
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enum Status { kUnLock, kWRLock, kRDLock };
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RWLockGuard(RWLock* rw_lock, Status init_status)
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: lock_(rw_lock), status_(Status::kUnLock) {
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switch (init_status) {
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case Status::kRDLock: {
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RDLock();
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break;
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}
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case Status::kWRLock: {
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WRLock();
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break;
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}
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case Status::kUnLock: {
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break;
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}
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}
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}
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void WRLock() {
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switch (status_) {
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case Status::kUnLock: {
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lock_->WRLock();
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status_ = Status::kWRLock;
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break;
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}
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case Status::kWRLock: {
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break;
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}
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case Status::kRDLock: {
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PADDLE_THROW(
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"Please unlock read lock first before invoking write lock.");
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break;
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}
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}
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}
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void RDLock() {
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switch (status_) {
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case Status::kUnLock: {
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lock_->RDLock();
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status_ = Status::kRDLock;
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break;
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}
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case Status::kRDLock: {
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break;
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}
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case Status::kWRLock: {
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PADDLE_THROW(
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"Please unlock write lock first before invoking read lock.");
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break;
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}
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}
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}
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void UnLock() {
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if (status_ != Status::kUnLock) {
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lock_->UNLock();
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status_ = Status::kUnLock;
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}
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}
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~RWLockGuard() { UnLock(); }
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private:
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RWLock* lock_;
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Status status_;
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};
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} // namespace framework
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} // namespace paddle
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