MDL_context_owner Class Reference

#include <mdl.h>

List of all members.

Public Member Functions
virtual void	enter_cond (mysql_cond_t *cond, mysql_mutex_t *mutex, const PSI_stage_info *stage, PSI_stage_info *old_stage, const char *src_function, const char *src_file, int src_line)=0
virtual void	exit_cond (const PSI_stage_info *stage, const char *src_function, const char *src_file, int src_line)=0
virtual int	is_killed ()=0
virtual THD *	get_thd ()=0
virtual bool	notify_shared_lock (MDL_context_owner *in_use, bool needs_thr_lock_abort)=0

---

Detailed Description

An interface to separate the MDL module from the THD, and the rest of the server code.

---

Member Function Documentation

virtual void MDL_context_owner::enter_cond	(	mysql_cond_t *	cond,
		mysql_mutex_t *	mutex,
		const PSI_stage_info *	stage,
		PSI_stage_info *	old_stage,
		const char *	src_function,
		const char *	src_file,
		int	src_line
	)		[pure virtual]

Enter a condition wait. For enter_cond() / exit_cond() to work the mutex must be held before enter_cond(); this mutex is then released by exit_cond(). Usage must be: lock mutex; enter_cond(); your code; exit_cond().

Parameters:

	cond	the condition to wait on
	mutex	the associated mutex
[in]	stage	the stage to enter, or NULL
[out]	old_stage	the previous stage, or NULL
	src_function	function name of the caller
	src_file	file name of the caller
	src_line	line number of the caller

See also:

ENTER_COND(), THD::enter_cond()

EXIT_COND(), THD::exit_cond()

virtual THD* MDL_context_owner::get_thd

(

)

[pure virtual]

This one is only used for DEBUG_SYNC. (Do not use it to peek/poke into other parts of THD.)

virtual int MDL_context_owner::is_killed

(

)

[pure virtual]

Has the owner thread been killed?

virtual bool MDL_context_owner::notify_shared_lock	(	MDL_context_owner *	in_use,
		bool	needs_thr_lock_abort
	)		[pure virtual]

See also:

THD::notify_shared_lock()

---

The documentation for this class was generated from the following file:

• mdl.h