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131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
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#ident "$Id$"
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/*======
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This file is part of PerconaFT.
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Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
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PerconaFT is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2,
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as published by the Free Software Foundation.
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PerconaFT 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 PerconaFT. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------
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PerconaFT is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License, version 3,
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as published by the Free Software Foundation.
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PerconaFT 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 Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
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======= */
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#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
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#pragma once
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#include <toku_portability.h>
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#include <toku_pthread.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <util/context.h>
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//TODO: update comment, this is from rwlock.h
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namespace toku {
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class frwlock {
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public:
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void init(toku_mutex_t *const mutex
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#if defined(TOKU_MYSQL_WITH_PFS)
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,
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const toku_instr_key &rwlock_instr_key
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#endif
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);
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void deinit(void);
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void write_lock(bool expensive);
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bool try_write_lock(bool expensive);
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void write_unlock(void);
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// returns true if acquiring a write lock will be expensive
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bool write_lock_is_expensive(void);
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void read_lock(void);
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bool try_read_lock(void);
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void read_unlock(void);
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// returns true if acquiring a read lock will be expensive
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bool read_lock_is_expensive(void);
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uint32_t users(void) const;
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uint32_t blocked_users(void) const;
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uint32_t writers(void) const;
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uint32_t blocked_writers(void) const;
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uint32_t readers(void) const;
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uint32_t blocked_readers(void) const;
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private:
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struct queue_item {
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toku_cond_t *cond;
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struct queue_item *next;
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};
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bool queue_is_empty(void) const;
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void enq_item(queue_item *const item);
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toku_cond_t *deq_item(void);
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void maybe_signal_or_broadcast_next(void);
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void maybe_signal_next_writer(void);
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toku_mutex_t *m_mutex;
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uint32_t m_num_readers;
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uint32_t m_num_writers;
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uint32_t m_num_want_write;
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uint32_t m_num_want_read;
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uint32_t m_num_signaled_readers;
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// number of writers waiting that are expensive
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// MUST be < m_num_want_write
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uint32_t m_num_expensive_want_write;
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// bool that states if the current writer is expensive
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// if there is no current writer, then is false
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bool m_current_writer_expensive;
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// bool that states if waiting for a read
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// is expensive
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// if there are currently no waiting readers, then set to false
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bool m_read_wait_expensive;
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// thread-id of the current writer
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int m_current_writer_tid;
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// context id describing the context of the current writer blocking
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// new readers (either because this writer holds the write lock or
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// is the first to want the write lock).
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context_id m_blocking_writer_context_id;
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queue_item m_queue_item_read;
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bool m_wait_read_is_in_queue;
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toku_cond_t m_wait_read;
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#if defined(TOKU_MYSQL_WITH_PFS)
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toku_pthread_rwlock_t m_rwlock;
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#endif
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queue_item *m_wait_head;
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queue_item *m_wait_tail;
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};
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ENSURE_POD(frwlock);
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} // namespace toku
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// include the implementation here
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// #include "frwlock.cc"
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