/***************************************************************************** Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved. Copyright (c) 2008, Google Inc. Portions of this file contain modifications contributed and copyrighted by Google, Inc. Those modifications are gratefully acknowledged and are described briefly in the InnoDB documentation. The contributions by Google are incorporated with their permission, and subject to the conditions contained in the file COPYING.Google. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. 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 GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA *****************************************************************************/ /**************************************************//** @file include/sync0rw.ic The read-write lock (for threads) Created 9/11/1995 Heikki Tuuri *******************************************************/ #include "os0event.h" /******************************************************************//** Lock an rw-lock in shared mode for the current thread. If the rw-lock is locked in exclusive mode, or there is an exclusive lock request waiting, the function spins a preset time (controlled by srv_n_spin_wait_rounds), waiting for the lock before suspending the thread. */ void rw_lock_s_lock_spin( /*================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass, /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name,/*!< in: file name where lock requested */ ulint line); /*!< in: line where requested */ #ifdef UNIV_DEBUG /******************************************************************//** Inserts the debug information for an rw-lock. */ void rw_lock_add_debug_info( /*===================*/ rw_lock_t* lock, /*!< in: rw-lock */ ulint pass, /*!< in: pass value */ ulint lock_type, /*!< in: lock type */ const char* file_name, /*!< in: file where requested */ ulint line); /*!< in: line where requested */ /******************************************************************//** Removes a debug information struct for an rw-lock. */ void rw_lock_remove_debug_info( /*======================*/ rw_lock_t* lock, /*!< in: rw-lock */ ulint pass, /*!< in: pass value */ ulint lock_type); /*!< in: lock type */ #endif /* UNIV_DEBUG */ /********************************************************************//** Check if there are threads waiting for the rw-lock. @return 1 if waiters, 0 otherwise */ UNIV_INLINE ulint rw_lock_get_waiters( /*================*/ const rw_lock_t* lock) /*!< in: rw-lock */ { return(lock->waiters); } /********************************************************************//** Sets lock->waiters to 1. It is not an error if lock->waiters is already 1. On platforms where ATOMIC builtins are used this function enforces a memory barrier. */ UNIV_INLINE void rw_lock_set_waiter_flag( /*====================*/ rw_lock_t* lock) /*!< in/out: rw-lock */ { #ifdef INNODB_RW_LOCKS_USE_ATOMICS (void) os_compare_and_swap_ulint(&lock->waiters, 0, 1); #else /* INNODB_RW_LOCKS_USE_ATOMICS */ lock->waiters = 1; os_wmb; #endif /* INNODB_RW_LOCKS_USE_ATOMICS */ } /********************************************************************//** Resets lock->waiters to 0. It is not an error if lock->waiters is already 0. On platforms where ATOMIC builtins are used this function enforces a memory barrier. */ UNIV_INLINE void rw_lock_reset_waiter_flag( /*======================*/ rw_lock_t* lock) /*!< in/out: rw-lock */ { #ifdef INNODB_RW_LOCKS_USE_ATOMICS (void) os_compare_and_swap_ulint(&lock->waiters, 1, 0); #else /* INNODB_RW_LOCKS_USE_ATOMICS */ lock->waiters = 0; os_wmb; #endif /* INNODB_RW_LOCKS_USE_ATOMICS */ } /******************************************************************//** Returns the write-status of the lock - this function made more sense with the old rw_lock implementation. @return RW_LOCK_NOT_LOCKED, RW_LOCK_X, RW_LOCK_X_WAIT, RW_LOCK_SX */ UNIV_INLINE ulint rw_lock_get_writer( /*===============*/ const rw_lock_t* lock) /*!< in: rw-lock */ { lint lock_word = lock->lock_word; ut_ad(lock_word <= X_LOCK_DECR); if (lock_word > X_LOCK_HALF_DECR) { /* return NOT_LOCKED in s-lock state, like the writer member of the old lock implementation. */ return(RW_LOCK_NOT_LOCKED); } else if (lock_word > 0) { /* sx-locked, no x-locks */ return(RW_LOCK_SX); } else if (lock_word == 0 || lock_word == -X_LOCK_HALF_DECR || lock_word <= -X_LOCK_DECR) { /* x-lock with sx-lock is also treated as RW_LOCK_EX */ return(RW_LOCK_X); } else { /* x-waiter with sx-lock is also treated as RW_LOCK_WAIT_EX e.g. -X_LOCK_HALF_DECR < lock_word < 0 : without sx -X_LOCK_DECR < lock_word < -X_LOCK_HALF_DECR : with sx */ return(RW_LOCK_X_WAIT); } } /******************************************************************//** Returns the number of readers (s-locks). @return number of readers */ UNIV_INLINE ulint rw_lock_get_reader_count( /*=====================*/ const rw_lock_t* lock) /*!< in: rw-lock */ { lint lock_word = lock->lock_word; ut_ad(lock_word <= X_LOCK_DECR); if (lock_word > X_LOCK_HALF_DECR) { /* s-locked, no x-waiter */ return(X_LOCK_DECR - lock_word); } else if (lock_word > 0) { /* s-locked, with sx-locks only */ return(X_LOCK_HALF_DECR - lock_word); } else if (lock_word == 0) { /* x-locked */ return(0); } else if (lock_word > -X_LOCK_HALF_DECR) { /* s-locked, with x-waiter */ return((ulint)(-lock_word)); } else if (lock_word == -X_LOCK_HALF_DECR) { /* x-locked with sx-locks */ return(0); } else if (lock_word > -X_LOCK_DECR) { /* s-locked, with x-waiter and sx-lock */ return((ulint)(-(lock_word + X_LOCK_HALF_DECR))); } /* no s-locks */ return(0); } #ifndef INNODB_RW_LOCKS_USE_ATOMICS UNIV_INLINE ib_mutex_t* rw_lock_get_mutex( /*==============*/ rw_lock_t* lock) { return(&(lock->mutex)); } #endif /* INNODB_RW_LOCKS_USE_ATOMICS */ /******************************************************************//** Returns the value of writer_count for the lock. Does not reserve the lock mutex, so the caller must be sure it is not changed during the call. @return value of writer_count */ UNIV_INLINE ulint rw_lock_get_x_lock_count( /*=====================*/ const rw_lock_t* lock) /*!< in: rw-lock */ { lint lock_copy = lock->lock_word; ut_ad(lock_copy <= X_LOCK_DECR); if (lock_copy == 0 || lock_copy == -X_LOCK_HALF_DECR) { /* "1 x-lock" or "1 x-lock + sx-locks" */ return(1); } else if (lock_copy > -X_LOCK_DECR) { /* s-locks, one or more sx-locks if > 0, or x-waiter if < 0 */ return(0); } else if (lock_copy > -(X_LOCK_DECR + X_LOCK_HALF_DECR)) { /* no s-lock, no sx-lock, 2 or more x-locks. First 2 x-locks are set with -X_LOCK_DECR, all other recursive x-locks are set with -1 */ return(2 - (lock_copy + X_LOCK_DECR)); } else { /* no s-lock, 1 or more sx-lock, 2 or more x-locks. First 2 x-locks are set with -(X_LOCK_DECR + X_LOCK_HALF_DECR), all other recursive x-locks are set with -1 */ return(2 - (lock_copy + X_LOCK_DECR + X_LOCK_HALF_DECR)); } } /******************************************************************//** Returns the number of sx-lock for the lock. Does not reserve the lock mutex, so the caller must be sure it is not changed during the call. @return value of sx-lock count */ UNIV_INLINE ulint rw_lock_get_sx_lock_count( /*======================*/ const rw_lock_t* lock) /*!< in: rw-lock */ { #ifdef UNIV_DEBUG lint lock_copy = lock->lock_word; ut_ad(lock_copy <= X_LOCK_DECR); while (lock_copy < 0) { lock_copy += X_LOCK_DECR; } if (lock_copy > 0 && lock_copy <= X_LOCK_HALF_DECR) { return(lock->sx_recursive); } return(0); #else /* UNIV_DEBUG */ return(lock->sx_recursive); #endif /* UNIV_DEBUG */ } /******************************************************************//** Two different implementations for decrementing the lock_word of a rw_lock: one for systems supporting atomic operations, one for others. This does does not support recusive x-locks: they should be handled by the caller and need not be atomic since they are performed by the current lock holder. Returns true if the decrement was made, false if not. @return true if decr occurs */ UNIV_INLINE bool rw_lock_lock_word_decr( /*===================*/ rw_lock_t* lock, /*!< in/out: rw-lock */ ulint amount, /*!< in: amount to decrement */ lint threshold) /*!< in: threshold of judgement */ { #ifdef INNODB_RW_LOCKS_USE_ATOMICS lint local_lock_word; os_rmb; local_lock_word = lock->lock_word; while (local_lock_word > threshold) { if (os_compare_and_swap_lint(&lock->lock_word, local_lock_word, local_lock_word - amount)) { return(true); } local_lock_word = lock->lock_word; } return(false); #else /* INNODB_RW_LOCKS_USE_ATOMICS */ bool success = false; mutex_enter(&(lock->mutex)); if (lock->lock_word > threshold) { lock->lock_word -= amount; success = true; } mutex_exit(&(lock->mutex)); return(success); #endif /* INNODB_RW_LOCKS_USE_ATOMICS */ } /******************************************************************//** Increments lock_word the specified amount and returns new value. @return lock->lock_word after increment */ UNIV_INLINE lint rw_lock_lock_word_incr( /*===================*/ rw_lock_t* lock, /*!< in/out: rw-lock */ ulint amount) /*!< in: amount of increment */ { #ifdef INNODB_RW_LOCKS_USE_ATOMICS return(os_atomic_increment_lint(&lock->lock_word, amount)); #else /* INNODB_RW_LOCKS_USE_ATOMICS */ lint local_lock_word; mutex_enter(&(lock->mutex)); lock->lock_word += amount; local_lock_word = lock->lock_word; mutex_exit(&(lock->mutex)); return(local_lock_word); #endif /* INNODB_RW_LOCKS_USE_ATOMICS */ } /******************************************************************//** This function sets the lock->writer_thread and lock->recursive fields. For platforms where we are using atomic builtins instead of lock->mutex it sets the lock->writer_thread field using atomics to ensure memory ordering. Note that it is assumed that the caller of this function effectively owns the lock i.e.: nobody else is allowed to modify lock->writer_thread at this point in time. The protocol is that lock->writer_thread MUST be updated BEFORE the lock->recursive flag is set. */ UNIV_INLINE void rw_lock_set_writer_id_and_recursion_flag( /*=====================================*/ rw_lock_t* lock, /*!< in/out: lock to work on */ bool recursive) /*!< in: true if recursion allowed */ { os_thread_id_t curr_thread = os_thread_get_curr_id(); #ifdef INNODB_RW_LOCKS_USE_ATOMICS os_thread_id_t local_thread; ibool success; /* Prevent Valgrind warnings about writer_thread being uninitialized. It does not matter if writer_thread is uninitialized, because we are comparing writer_thread against itself, and the operation should always succeed. */ UNIV_MEM_VALID(&lock->writer_thread, sizeof lock->writer_thread); local_thread = lock->writer_thread; success = os_compare_and_swap_thread_id( &lock->writer_thread, local_thread, curr_thread); ut_a(success); lock->recursive = recursive; #else /* INNODB_RW_LOCKS_USE_ATOMICS */ mutex_enter(&lock->mutex); lock->writer_thread = curr_thread; lock->recursive = recursive; mutex_exit(&lock->mutex); #endif /* INNODB_RW_LOCKS_USE_ATOMICS */ } /******************************************************************//** Low-level function which tries to lock an rw-lock in s-mode. Performs no spinning. @return TRUE if success */ UNIV_INLINE ibool rw_lock_s_lock_low( /*===============*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass MY_ATTRIBUTE((unused)), /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name, /*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { if (!rw_lock_lock_word_decr(lock, 1, 0)) { /* Locking did not succeed */ return(FALSE); } ut_d(rw_lock_add_debug_info(lock, pass, RW_LOCK_S, file_name, line)); /* These debugging values are not set safely: they may be incorrect or even refer to a line that is invalid for the file name. */ lock->last_s_file_name = file_name; lock->last_s_line = line; /* if (srv_instrument_semaphores) { lock->thread_id = os_thread_get_curr_id(); lock->file_name = file_name; lock->line = line; } */ return(TRUE); /* locking succeeded */ } /******************************************************************//** NOTE! Use the corresponding macro, not directly this function! Lock an rw-lock in shared mode for the current thread. If the rw-lock is locked in exclusive mode, or there is an exclusive lock request waiting, the function spins a preset time (controlled by srv_n_spin_wait_rounds), waiting for the lock, before suspending the thread. */ UNIV_INLINE void rw_lock_s_lock_func( /*================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass, /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name,/*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { /* NOTE: As we do not know the thread ids for threads which have s-locked a latch, and s-lockers will be served only after waiting x-lock requests have been fulfilled, then if this thread already owns an s-lock here, it may end up in a deadlock with another thread which requests an x-lock here. Therefore, we will forbid recursive s-locking of a latch: the following assert will warn the programmer of the possibility of this kind of a deadlock. If we want to implement safe recursive s-locking, we should keep in a list the thread ids of the threads which have s-locked a latch. This would use some CPU time. */ ut_ad(!rw_lock_own(lock, RW_LOCK_S)); /* see NOTE above */ ut_ad(!rw_lock_own(lock, RW_LOCK_X)); if (!rw_lock_s_lock_low(lock, pass, file_name, line)) { /* Did not succeed, try spin wait */ rw_lock_s_lock_spin(lock, pass, file_name, line); } } /******************************************************************//** NOTE! Use the corresponding macro, not directly this function! Lock an rw-lock in exclusive mode for the current thread if the lock can be obtained immediately. @return TRUE if success */ UNIV_INLINE ibool rw_lock_x_lock_func_nowait( /*=======================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ const char* file_name,/*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { ibool success; ibool local_recursive= lock->recursive; #ifdef INNODB_RW_LOCKS_USE_ATOMICS success = os_compare_and_swap_lint(&lock->lock_word, X_LOCK_DECR, 0); #else success = FALSE; mutex_enter(&(lock->mutex)); if (lock->lock_word == X_LOCK_DECR) { lock->lock_word = 0; success = TRUE; } mutex_exit(&(lock->mutex)); #endif /* Note: recursive must be loaded before writer_thread see comment for rw_lock_set_writer_id_and_recursion_flag(). To achieve this we load it before os_compare_and_swap_lint(), which implies full memory barrier in current implementation. */ if (success) { rw_lock_set_writer_id_and_recursion_flag(lock, true); } else if (local_recursive && os_thread_eq(lock->writer_thread, os_thread_get_curr_id())) { /* Relock: this lock_word modification is safe since no other threads can modify (lock, unlock, or reserve) lock_word while there is an exclusive writer and this is the writer thread. */ if (lock->lock_word == 0 || lock->lock_word == -X_LOCK_HALF_DECR) { /* There are 1 x-locks */ lock->lock_word -= X_LOCK_DECR; } else if (lock->lock_word <= -X_LOCK_DECR) { /* There are 2 or more x-locks */ lock->lock_word--; } else { /* Failure */ return(FALSE); } /* Watch for too many recursive locks */ ut_ad(lock->lock_word < 0); } else { /* Failure */ return(FALSE); } ut_d(rw_lock_add_debug_info(lock, 0, RW_LOCK_X, file_name, line)); /* if (srv_instrument_semaphores) { lock->thread_id = os_thread_get_curr_id(); lock->file_name = file_name; lock->line = line; } */ lock->last_x_file_name = file_name; lock->last_x_line = line; ut_ad(rw_lock_validate(lock)); return(TRUE); } /******************************************************************//** Releases a shared mode lock. */ UNIV_INLINE void rw_lock_s_unlock_func( /*==================*/ #ifdef UNIV_DEBUG ulint pass, /*!< in: pass value; != 0, if the lock may have been passed to another thread to unlock */ #endif /* UNIV_DEBUG */ rw_lock_t* lock) /*!< in/out: rw-lock */ { ut_ad(lock->lock_word > -X_LOCK_DECR); ut_ad(lock->lock_word != 0); ut_ad(lock->lock_word < X_LOCK_DECR); ut_d(rw_lock_remove_debug_info(lock, pass, RW_LOCK_S)); /* Increment lock_word to indicate 1 less reader */ lint lock_word = rw_lock_lock_word_incr(lock, 1); if (lock_word == 0 || lock_word == -X_LOCK_HALF_DECR) { /* wait_ex waiter exists. It may not be asleep, but we signal anyway. We do not wake other waiters, because they can't exist without wait_ex waiter and wait_ex waiter goes first.*/ os_event_set(lock->wait_ex_event); sync_array_object_signalled(); } ut_ad(rw_lock_validate(lock)); } /******************************************************************//** Releases an exclusive mode lock. */ UNIV_INLINE void rw_lock_x_unlock_func( /*==================*/ #ifdef UNIV_DEBUG ulint pass, /*!< in: pass value; != 0, if the lock may have been passed to another thread to unlock */ #endif /* UNIV_DEBUG */ rw_lock_t* lock) /*!< in/out: rw-lock */ { ut_ad(lock->lock_word == 0 || lock->lock_word == -X_LOCK_HALF_DECR || lock->lock_word <= -X_LOCK_DECR); /* lock->recursive flag also indicates if lock->writer_thread is valid or stale. If we are the last of the recursive callers then we must unset lock->recursive flag to indicate that the lock->writer_thread is now stale. Note that since we still hold the x-lock we can safely read the lock_word. */ if (lock->lock_word == 0) { /* Last caller in a possible recursive chain. */ lock->recursive = FALSE; } ut_d(rw_lock_remove_debug_info(lock, pass, RW_LOCK_X)); if (lock->lock_word == 0 || lock->lock_word == -X_LOCK_HALF_DECR) { /* There is 1 x-lock */ /* atomic increment is needed, because it is last */ if (rw_lock_lock_word_incr(lock, X_LOCK_DECR) <= 0) { ut_error; } /* This no longer has an X-lock but it may still have an SX-lock. So it is now free for S-locks by other threads. We need to signal read/write waiters. We do not need to signal wait_ex waiters, since they cannot exist when there is a writer. */ if (lock->waiters) { rw_lock_reset_waiter_flag(lock); os_event_set(lock->event); sync_array_object_signalled(); } } else if (lock->lock_word == -X_LOCK_DECR || lock->lock_word == -(X_LOCK_DECR + X_LOCK_HALF_DECR)) { /* There are 2 x-locks */ lock->lock_word += X_LOCK_DECR; } else { /* There are more than 2 x-locks. */ ut_ad(lock->lock_word < -X_LOCK_DECR); lock->lock_word += 1; } ut_ad(rw_lock_validate(lock)); } /******************************************************************//** Releases a sx mode lock. */ UNIV_INLINE void rw_lock_sx_unlock_func( /*===================*/ #ifdef UNIV_DEBUG ulint pass, /*!< in: pass value; != 0, if the lock may have been passed to another thread to unlock */ #endif /* UNIV_DEBUG */ rw_lock_t* lock) /*!< in/out: rw-lock */ { ut_ad(rw_lock_get_sx_lock_count(lock)); ut_ad(lock->sx_recursive > 0); --lock->sx_recursive; ut_d(rw_lock_remove_debug_info(lock, pass, RW_LOCK_SX)); if (lock->sx_recursive == 0) { /* Last caller in a possible recursive chain. */ if (lock->lock_word > 0) { lock->recursive = FALSE; UNIV_MEM_INVALID(&lock->writer_thread, sizeof lock->writer_thread); if (rw_lock_lock_word_incr(lock, X_LOCK_HALF_DECR) <= X_LOCK_HALF_DECR) { ut_error; } /* Lock is now free. May have to signal read/write waiters. We do not need to signal wait_ex waiters, since they cannot exist when there is an sx-lock holder. */ if (lock->waiters) { rw_lock_reset_waiter_flag(lock); os_event_set(lock->event); sync_array_object_signalled(); } } else { /* still has x-lock */ ut_ad(lock->lock_word == -X_LOCK_HALF_DECR || lock->lock_word <= -(X_LOCK_DECR + X_LOCK_HALF_DECR)); lock->lock_word += X_LOCK_HALF_DECR; } } ut_ad(rw_lock_validate(lock)); } #ifdef UNIV_PFS_RWLOCK /******************************************************************//** Performance schema instrumented wrap function for rw_lock_create_func(). NOTE! Please use the corresponding macro rw_lock_create(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_create_func( /*====================*/ mysql_pfs_key_t key, /*!< in: key registered with performance schema */ rw_lock_t* lock, /*!< in/out: pointer to memory */ # ifdef UNIV_DEBUG latch_level_t level, /*!< in: level */ # endif /* UNIV_DEBUG */ const char* cmutex_name, /*!< in: mutex name */ const char* cfile_name, /*!< in: file name where created */ ulint cline) /*!< in: file line where created */ { ut_d(new(lock) rw_lock_t()); /* Initialize the rwlock for performance schema */ lock->pfs_psi = PSI_RWLOCK_CALL(init_rwlock)(key, lock); /* The actual function to initialize an rwlock */ rw_lock_create_func(lock, #ifdef UNIV_DEBUG level, #endif /* UNIV_DEBUG */ cmutex_name, cfile_name, cline); } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_x_lock_func() NOTE! Please use the corresponding macro rw_lock_x_lock(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_x_lock_func( /*====================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass, /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name,/*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { if (lock->pfs_psi != NULL) { PSI_rwlock_locker* locker; PSI_rwlock_locker_state state; /* Record the acquisition of a read-write lock in exclusive mode in performance schema */ /* MySQL 5.7 New PSI */ #define PSI_RWLOCK_EXCLUSIVELOCK PSI_RWLOCK_WRITELOCK locker = PSI_RWLOCK_CALL(start_rwlock_wrwait)( &state, lock->pfs_psi, PSI_RWLOCK_EXCLUSIVELOCK, file_name, static_cast(line)); rw_lock_x_lock_func( lock, pass, file_name, static_cast(line)); if (locker != NULL) { PSI_RWLOCK_CALL(end_rwlock_wrwait)(locker, 0); } } else { rw_lock_x_lock_func(lock, pass, file_name, line); } } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_x_lock_func_nowait() NOTE! Please use the corresponding macro rw_lock_x_lock_func(), not directly this function! @return TRUE if success */ UNIV_INLINE ibool pfs_rw_lock_x_lock_func_nowait( /*===========================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ const char* file_name,/*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { ibool ret; if (lock->pfs_psi != NULL) { PSI_rwlock_locker* locker; PSI_rwlock_locker_state state; /* Record the acquisition of a read-write trylock in exclusive mode in performance schema */ #define PSI_RWLOCK_TRYEXCLUSIVELOCK PSI_RWLOCK_TRYWRITELOCK locker = PSI_RWLOCK_CALL(start_rwlock_wrwait)( &state, lock->pfs_psi, PSI_RWLOCK_TRYEXCLUSIVELOCK, file_name, static_cast(line)); ret = rw_lock_x_lock_func_nowait(lock, file_name, line); if (locker != NULL) { PSI_RWLOCK_CALL(end_rwlock_wrwait)( locker, static_cast(ret)); } } else { ret = rw_lock_x_lock_func_nowait(lock, file_name, line); } return(ret); } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_free_func() NOTE! Please use the corresponding macro rw_lock_free(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_free_func( /*==================*/ rw_lock_t* lock) /*!< in: pointer to rw-lock */ { if (lock->pfs_psi != NULL) { PSI_RWLOCK_CALL(destroy_rwlock)(lock->pfs_psi); lock->pfs_psi = NULL; } rw_lock_free_func(lock); } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_s_lock_func() NOTE! Please use the corresponding macro rw_lock_s_lock(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_s_lock_func( /*====================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass, /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name,/*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { if (lock->pfs_psi != NULL) { PSI_rwlock_locker* locker; PSI_rwlock_locker_state state; #define PSI_RWLOCK_SHAREDLOCK PSI_RWLOCK_READLOCK /* Instrumented to inform we are aquiring a shared rwlock */ locker = PSI_RWLOCK_CALL(start_rwlock_rdwait)( &state, lock->pfs_psi, PSI_RWLOCK_SHAREDLOCK, file_name, static_cast(line)); rw_lock_s_lock_func(lock, pass, file_name, line); if (locker != NULL) { PSI_RWLOCK_CALL(end_rwlock_rdwait)(locker, 0); } } else { rw_lock_s_lock_func(lock, pass, file_name, line); } } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_sx_lock_func() NOTE! Please use the corresponding macro rw_lock_sx_lock(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_sx_lock_func( /*====================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass, /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name,/*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { if (lock->pfs_psi != NULL) { PSI_rwlock_locker* locker; PSI_rwlock_locker_state state; #define PSI_RWLOCK_SHAREDEXCLUSIVELOCK PSI_RWLOCK_WRITELOCK /* Instrumented to inform we are aquiring a shared rwlock */ locker = PSI_RWLOCK_CALL(start_rwlock_wrwait)( &state, lock->pfs_psi, PSI_RWLOCK_SHAREDEXCLUSIVELOCK, file_name, static_cast(line)); rw_lock_sx_lock_func(lock, pass, file_name, line); if (locker != NULL) { PSI_RWLOCK_CALL(end_rwlock_wrwait)(locker, 0); } } else { rw_lock_sx_lock_func(lock, pass, file_name, line); } } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_s_lock_func() NOTE! Please use the corresponding macro rw_lock_s_lock(), not directly this function! @return TRUE if success */ UNIV_INLINE ibool pfs_rw_lock_s_lock_low( /*===================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass, /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name, /*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { ibool ret; if (lock->pfs_psi != NULL) { PSI_rwlock_locker* locker; PSI_rwlock_locker_state state; #define PSI_RWLOCK_TRYSHAREDLOCK PSI_RWLOCK_TRYREADLOCK /* Instrumented to inform we are aquiring a shared rwlock */ locker = PSI_RWLOCK_CALL(start_rwlock_rdwait)( &state, lock->pfs_psi, PSI_RWLOCK_TRYSHAREDLOCK, file_name, static_cast(line)); ret = rw_lock_s_lock_low(lock, pass, file_name, line); if (locker != NULL) { PSI_RWLOCK_CALL(end_rwlock_rdwait)( locker, static_cast(ret)); } } else { ret = rw_lock_s_lock_low(lock, pass, file_name, line); } return(ret); } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_sx_lock_nowait() NOTE! Please use the corresponding macro, not directly this function! @return TRUE if success */ UNIV_INLINE ibool pfs_rw_lock_sx_lock_low( /*====================*/ rw_lock_t* lock, /*!< in: pointer to rw-lock */ ulint pass, /*!< in: pass value; != 0, if the lock will be passed to another thread to unlock */ const char* file_name, /*!< in: file name where lock requested */ ulint line) /*!< in: line where requested */ { ibool ret; if (lock->pfs_psi != NULL) { PSI_rwlock_locker* locker; PSI_rwlock_locker_state state; #define PSI_RWLOCK_TRYSHAREDEXCLUSIVELOCK PSI_RWLOCK_TRYWRITELOCK /* Instrumented to inform we are aquiring a shared exclusive rwlock */ locker = PSI_RWLOCK_CALL(start_rwlock_rdwait)( &state, lock->pfs_psi, PSI_RWLOCK_TRYSHAREDEXCLUSIVELOCK, file_name, static_cast(line)); ret = rw_lock_sx_lock_low(lock, pass, file_name, line); if (locker != NULL) { PSI_RWLOCK_CALL(end_rwlock_rdwait)( locker, static_cast(ret)); } } else { ret = rw_lock_sx_lock_low(lock, pass, file_name, line); } return(ret); } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_x_unlock_func() NOTE! Please use the corresponding macro rw_lock_x_unlock(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_x_unlock_func( /*======================*/ #ifdef UNIV_DEBUG ulint pass, /*!< in: pass value; != 0, if the lock may have been passed to another thread to unlock */ #endif /* UNIV_DEBUG */ rw_lock_t* lock) /*!< in/out: rw-lock */ { /* Inform performance schema we are unlocking the lock */ if (lock->pfs_psi != NULL) { PSI_RWLOCK_CALL(unlock_rwlock)(lock->pfs_psi); } rw_lock_x_unlock_func( #ifdef UNIV_DEBUG pass, #endif /* UNIV_DEBUG */ lock); } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_sx_unlock_func() NOTE! Please use the corresponding macro rw_lock_sx_unlock(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_sx_unlock_func( /*======================*/ #ifdef UNIV_DEBUG ulint pass, /*!< in: pass value; != 0, if the lock may have been passed to another thread to unlock */ #endif /* UNIV_DEBUG */ rw_lock_t* lock) /*!< in/out: rw-lock */ { /* Inform performance schema we are unlocking the lock */ if (lock->pfs_psi != NULL) { PSI_RWLOCK_CALL(unlock_rwlock)(lock->pfs_psi); } rw_lock_sx_unlock_func( #ifdef UNIV_DEBUG pass, #endif /* UNIV_DEBUG */ lock); } /******************************************************************//** Performance schema instrumented wrap function for rw_lock_s_unlock_func() NOTE! Please use the corresponding macro pfs_rw_lock_s_unlock(), not directly this function! */ UNIV_INLINE void pfs_rw_lock_s_unlock_func( /*======================*/ #ifdef UNIV_DEBUG ulint pass, /*!< in: pass value; != 0, if the lock may have been passed to another thread to unlock */ #endif /* UNIV_DEBUG */ rw_lock_t* lock) /*!< in/out: rw-lock */ { /* Inform performance schema we are unlocking the lock */ if (lock->pfs_psi != NULL) { PSI_RWLOCK_CALL(unlock_rwlock)(lock->pfs_psi); } rw_lock_s_unlock_func( #ifdef UNIV_DEBUG pass, #endif /* UNIV_DEBUG */ lock); } #endif /* UNIV_PFS_RWLOCK */