#include "sync0sync.h"
#include "sync0rw.h"
#include "buf0buf.h"
#include "srv0srv.h"
#include "buf0types.h"
#include "os0sync.h"
#include "ha_prototypes.h"

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Functions
UNIV_INTERN void	mutex_create_func (ib_mutex_t mutex, const char cfile_name, ulint cline)
UNIV_INTERN void	mutex_free_func (ib_mutex_t *mutex)
UNIV_INTERN ulint	mutex_enter_nowait_func (ib_mutex_t mutex, const char file_name __attribute__((unused)), ulint line __attribute__((unused)))
UNIV_INTERN void	mutex_set_waiters (ib_mutex_t *mutex, ulint n)
UNIV_INTERN void	mutex_spin_wait (ib_mutex_t mutex, const char file_name, ulint line)
UNIV_INTERN void	mutex_signal_object (ib_mutex_t *mutex)
UNIV_INTERN void	sync_init (void)
UNIV_INTERN void	sync_close (void)
UNIV_INTERN void	sync_print_wait_info (FILE *file)
UNIV_INTERN void	sync_print (FILE *file)

Variables
UNIV_INTERN ib_int64_t	mutex_exit_count
UNIV_INTERN ibool	sync_initialized = FALSE
UNIV_INTERN ut_list_base_node_t	mutex_list
UNIV_INTERN ib_mutex_t	mutex_list_mutex

Detailed Description

Mutex, the basic synchronization primitive

Created 9/5/1995 Heikki Tuuri

Definition in file sync0sync.cc.

Function Documentation

UNIV_INTERN void mutex_create_func	(	ib_mutex_t *	mutex,
		const char *	cfile_name,
		ulint	cline
	)

Creates, or rather, initializes a mutex object in a specified memory location (which must be appropriately aligned). The mutex is initialized in the reset state. Explicit freeing of the mutex with mutex_free is necessary only if the memory block containing it is freed.

Parameters

mutex	in: pointer to memory
cfile_name	in: file name where created
cline	in: file line where created

Definition at line 263 of file sync0sync.cc.

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UNIV_INTERN ulint mutex_enter_nowait_func	(	ib_mutex_t *	mutex,
		const char *file_name	__attribute__(unused),
		ulint line	__attribute__(unused)
	)

NOTE! Use the corresponding macro in the header file, not this function directly. Tries to lock the mutex for the current thread. If the lock is not acquired immediately, returns with return value 1.

Returns: 0 if succeed, 1 if not

Parameters

mutex	in: pointer to mutex
__attribute__	in: file name where mutex requested
__attribute__	in: line where requested

Definition at line 386 of file sync0sync.cc.

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UNIV_INTERN void mutex_free_func ( ib_mutex_t * mutex )

NOTE! Use the corresponding macro mutex_free(), not directly this function! Calling this function is obligatory only if the memory buffer containing the mutex is freed. Removes a mutex object from the mutex list. The mutex is checked to be in the reset state.

Parameters

mutex in: mutex

Definition at line 326 of file sync0sync.cc.

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UNIV_INTERN void mutex_set_waiters	(	ib_mutex_t *	mutex,
		ulint	n
	)

Sets the waiters field in a mutex.

Parameters

mutex	in: mutex
n	in: value to set

Definition at line 447 of file sync0sync.cc.

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UNIV_INTERN void mutex_signal_object ( ib_mutex_t * mutex )

Releases the threads waiting in the primary wait array for this mutex.

Parameters

mutex in: mutex

Definition at line 589 of file sync0sync.cc.

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UNIV_INTERN void mutex_spin_wait	(	ib_mutex_t *	mutex,
		const char *	file_name,
		ulint	line
	)

Reserves a mutex for the current thread. If the mutex is reserved, the function spins a preset time (controlled by SYNC_SPIN_ROUNDS), waiting for the mutex before suspending the thread.

Parameters

mutex	in: pointer to mutex
file_name	in: file name where mutex requested
line	in: line where requested

Definition at line 468 of file sync0sync.cc.

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UNIV_INTERN void sync_close ( void )

Frees the resources in InnoDB's own synchronization data structures. Use os_sync_free() after calling this.

Definition at line 1516 of file sync0sync.cc.

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UNIV_INTERN void sync_init ( void )

Initializes the synchronization data structures.

Definition at line 1439 of file sync0sync.cc.

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UNIV_INTERN void sync_print ( FILE * file )

Prints info of the sync system.

Parameters

file	in: file where to print

Definition at line 1594 of file sync0sync.cc.

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UNIV_INTERN void sync_print_wait_info ( FILE * file )

Prints wait info of the sync system.

Parameters

file	in: file where to print

Definition at line 1556 of file sync0sync.cc.

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Variable Documentation

UNIV_INTERN ib_int64_t mutex_exit_count

The number of mutex_exit() calls. Intended for performance

monitoring.

Definition at line 183 of file sync0sync.cc.

UNIV_INTERN ut_list_base_node_t mutex_list

Global list of database mutexes (not OS mutexes) created.

Definition at line 208 of file sync0sync.cc.

UNIV_INTERN ib_mutex_t mutex_list_mutex

Mutex protecting the mutex_list variable

Definition at line 211 of file sync0sync.cc.

UNIV_INTERN ibool sync_initialized = FALSE

This variable is set to TRUE when sync_init is called

Definition at line 186 of file sync0sync.cc.

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation