diff options
Diffstat (limited to 'storage/tokudb/PerconaFT/util/frwlock.h')
| -rw-r--r-- | storage/tokudb/PerconaFT/util/frwlock.h | 142 |
1 files changed, 74 insertions, 68 deletions
diff --git a/storage/tokudb/PerconaFT/util/frwlock.h b/storage/tokudb/PerconaFT/util/frwlock.h index 52b98a8d727..b02d95e545c 100644 --- a/storage/tokudb/PerconaFT/util/frwlock.h +++ b/storage/tokudb/PerconaFT/util/frwlock.h @@ -48,76 +48,82 @@ Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved. namespace toku { -class frwlock { -public: - - void init(toku_mutex_t *const mutex); - void deinit(void); - - void write_lock(bool expensive); - bool try_write_lock(bool expensive); - void write_unlock(void); - // returns true if acquiring a write lock will be expensive - bool write_lock_is_expensive(void); - - void read_lock(void); - bool try_read_lock(void); - void read_unlock(void); - // returns true if acquiring a read lock will be expensive - bool read_lock_is_expensive(void); - - uint32_t users(void) const; - uint32_t blocked_users(void) const; - uint32_t writers(void) const; - uint32_t blocked_writers(void) const; - uint32_t readers(void) const; - uint32_t blocked_readers(void) const; - -private: - struct queue_item { - toku_cond_t *cond; - struct queue_item *next; + class frwlock { + public: + void init(toku_mutex_t *const mutex +#if defined(TOKU_MYSQL_WITH_PFS) + , + const toku_instr_key &rwlock_instr_key +#endif + ); + void deinit(void); + + void write_lock(bool expensive); + bool try_write_lock(bool expensive); + void write_unlock(void); + // returns true if acquiring a write lock will be expensive + bool write_lock_is_expensive(void); + + void read_lock(void); + bool try_read_lock(void); + void read_unlock(void); + // returns true if acquiring a read lock will be expensive + bool read_lock_is_expensive(void); + + uint32_t users(void) const; + uint32_t blocked_users(void) const; + uint32_t writers(void) const; + uint32_t blocked_writers(void) const; + uint32_t readers(void) const; + uint32_t blocked_readers(void) const; + + private: + struct queue_item { + toku_cond_t *cond; + struct queue_item *next; + }; + + bool queue_is_empty(void) const; + void enq_item(queue_item *const item); + toku_cond_t *deq_item(void); + void maybe_signal_or_broadcast_next(void); + void maybe_signal_next_writer(void); + + toku_mutex_t *m_mutex; + + uint32_t m_num_readers; + uint32_t m_num_writers; + uint32_t m_num_want_write; + uint32_t m_num_want_read; + uint32_t m_num_signaled_readers; + // number of writers waiting that are expensive + // MUST be < m_num_want_write + uint32_t m_num_expensive_want_write; + // bool that states if the current writer is expensive + // if there is no current writer, then is false + bool m_current_writer_expensive; + // bool that states if waiting for a read + // is expensive + // if there are currently no waiting readers, then set to false + bool m_read_wait_expensive; + // thread-id of the current writer + int m_current_writer_tid; + // context id describing the context of the current writer blocking + // new readers (either because this writer holds the write lock or + // is the first to want the write lock). + context_id m_blocking_writer_context_id; + queue_item m_queue_item_read; + bool m_wait_read_is_in_queue; + + toku_cond_t m_wait_read; +#if defined(TOKU_MYSQL_WITH_PFS) + toku_pthread_rwlock_t m_rwlock; +#endif + queue_item *m_wait_head; + queue_item *m_wait_tail; }; - bool queue_is_empty(void) const; - void enq_item(queue_item *const item); - toku_cond_t *deq_item(void); - void maybe_signal_or_broadcast_next(void); - void maybe_signal_next_writer(void); - - toku_mutex_t *m_mutex; - - uint32_t m_num_readers; - uint32_t m_num_writers; - uint32_t m_num_want_write; - uint32_t m_num_want_read; - uint32_t m_num_signaled_readers; - // number of writers waiting that are expensive - // MUST be < m_num_want_write - uint32_t m_num_expensive_want_write; - // bool that states if the current writer is expensive - // if there is no current writer, then is false - bool m_current_writer_expensive; - // bool that states if waiting for a read - // is expensive - // if there are currently no waiting readers, then set to false - bool m_read_wait_expensive; - // thread-id of the current writer - int m_current_writer_tid; - // context id describing the context of the current writer blocking - // new readers (either because this writer holds the write lock or - // is the first to want the write lock). - context_id m_blocking_writer_context_id; - - toku_cond_t m_wait_read; - queue_item m_queue_item_read; - bool m_wait_read_is_in_queue; - - queue_item *m_wait_head; - queue_item *m_wait_tail; -}; - -ENSURE_POD(frwlock); + ENSURE_POD(frwlock); } // namespace toku |