Thread_excursion Class Reference

Public Member Functions
	Thread_excursion (THD *thd)
void	try_to_attach_to (THD *thd)

Detailed Description

Helper class to perform a thread excursion.

This class is used to temporarily switch to another session (THD structure). It will set up the PSI structures and other "globals" correctly (e.g., thread-specific variables) so that the POSIX thread looks exactly like the session attached to.

On destruction, the original session (which is supplied to the constructor) will be re-attached automatically. For example, with this code, the value of current_thd will be the same before and after execution of the code.

{
  Thread_excursion excursion(current_thd);
  for (int i = 0 ; i < count ; ++i)
    excursion.attach_to(other_thd[i]);
}

Warning

The class is not designed to be inherited from.

Definition at line 176 of file binlog.cc.

Member Function Documentation

void Thread_excursion::try_to_attach_to ( THD *  thd )

inline

Try to attach the POSIX thread to a session.

• This function attaches the POSIX thread to a session in MAX_SESSION_ATTACH_TRIES tries when encountering 'out of memory' error, and terminates the server after failed in MAX_SESSION_ATTACH_TRIES tries.

Parameters

[in]

thd

The thd of a session

Definition at line 207 of file binlog.cc.

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

• sql/binlog.cc