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ebfc4e6ad0
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commit 86587affafe77ef555f7c3839839de44f0f203f3
Author: Tian Xia <tianx@fb.com>
Date: Tue Oct 4 10:01:52 2016 -0700
Allow filtering of show commands through admission control
139 lines
4.2 KiB
C++
139 lines
4.2 KiB
C++
/*
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Copyright (c) 2015, Facebook, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#pragma once
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/* C++ standard header file */
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#include <chrono>
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#include <condition_variable>
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#include <functional>
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#include <mutex>
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#include <unordered_map>
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/* MySQL header files */
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#include "./my_sys.h"
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#include "mysql/plugin.h"
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/* RocksDB header files */
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#include "rocksdb/utilities/transaction_db_mutex.h"
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namespace myrocks {
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class Rdb_mutex: public rocksdb::TransactionDBMutex {
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Rdb_mutex(const Rdb_mutex& p) = delete;
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Rdb_mutex& operator = (const Rdb_mutex& p)=delete;
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public:
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Rdb_mutex();
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virtual ~Rdb_mutex();
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/*
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Override parent class's virtual methods of interrest.
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*/
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// Attempt to acquire lock. Return OK on success, or other Status on failure.
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// If returned status is OK, TransactionDB will eventually call UnLock().
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virtual rocksdb::Status Lock() override;
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// Attempt to acquire lock. If timeout is non-negative, operation should be
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// failed after this many microseconds.
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// Returns OK on success,
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// TimedOut if timed out,
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// or other Status on failure.
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// If returned status is OK, TransactionDB will eventually call UnLock().
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virtual rocksdb::Status TryLockFor(
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int64_t timeout_time __attribute__((__unused__))) override;
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// Unlock Mutex that was successfully locked by Lock() or TryLockUntil()
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virtual void UnLock() override;
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private:
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mysql_mutex_t m_mutex;
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friend class Rdb_cond_var;
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#ifndef STANDALONE_UNITTEST
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void set_unlock_action(PSI_stage_info *old_stage_arg);
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std::unordered_map<THD*, std::shared_ptr<PSI_stage_info>> m_old_stage_info;
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#endif
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};
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class Rdb_cond_var: public rocksdb::TransactionDBCondVar {
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public:
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Rdb_cond_var();
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virtual ~Rdb_cond_var();
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/*
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Override parent class's virtual methods of interrest.
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*/
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// Block current thread until condition variable is notified by a call to
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// Notify() or NotifyAll(). Wait() will be called with mutex locked.
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// Returns OK if notified.
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// Returns non-OK if TransactionDB should stop waiting and fail the operation.
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// May return OK spuriously even if not notified.
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virtual rocksdb::Status
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Wait(std::shared_ptr<rocksdb::TransactionDBMutex> mutex) override;
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// Block current thread until condition variable is notifiesd by a call to
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// Notify() or NotifyAll(), or if the timeout is reached.
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// If timeout is non-negative, operation should be failed after this many
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// microseconds.
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// If implementing a custom version of this class, the implementation may
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// choose to ignore the timeout.
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//
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// Returns OK if notified.
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// Returns TimedOut if timeout is reached.
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// Returns other status if TransactionDB should otherwis stop waiting and
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// fail the operation.
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// May return OK spuriously even if not notified.
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virtual rocksdb::Status
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WaitFor(std::shared_ptr<rocksdb::TransactionDBMutex> mutex,
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int64_t timeout_time) override;
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// If any threads are waiting on *this, unblock at least one of the
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// waiting threads.
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virtual void Notify() override;
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// Unblocks all threads waiting on *this.
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virtual void NotifyAll() override;
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private:
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mysql_cond_t m_cond;
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};
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class Rdb_mutex_factory : public rocksdb::TransactionDBMutexFactory {
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public:
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/*
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Override parent class's virtual methods of interrest.
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*/
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virtual std::shared_ptr<rocksdb::TransactionDBMutex>
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AllocateMutex() override {
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return
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std::make_shared<Rdb_mutex>();
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}
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virtual std::shared_ptr<rocksdb::TransactionDBCondVar>
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AllocateCondVar() override {
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return
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std::make_shared<Rdb_cond_var>();
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}
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virtual ~Rdb_mutex_factory() {}
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};
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} // namespace myrocks
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