Control block for MetaLogBuffer and MetaLogger. More...

Detailed Description

Control block for MetaLogBuffer and MetaLogger.

Definition at line 38 of file meta_log_buffer.hpp.

#include <meta_log_buffer.hpp>

Collaboration diagram for foedus::log::MetaLogControlBlock:

Public Member Functions
void	initialize ()

void	uninitialize ()

bool	has_waiting_log () const

Public Attributes
char	buffer_ [1<< 12]
	The content of current log buffer. More...

uint32_t	buffer_used_

uint64_t	oldest_offset_
	Offset from which log entries are not gleaned yet. More...

uint64_t	durable_offset_
	Offset upto which log entries are fsynced. More...

soc::SharedMutex	mutex_
	Accesses in MetaLogBuffer are protected with this mutex. More...

soc::SharedPolling	logger_wakeup_
	the logger sleeps on this variable More...

Member Function Documentation

bool foedus::log::MetaLogControlBlock::has_waiting_log ( ) const

inline

Definition at line 50 of file meta_log_buffer.hpp.

References buffer_used_.

50 { return buffer_used_ > 0; }

foedus::log::MetaLogControlBlock::buffer_used_

uint32_t buffer_used_

Definition: meta_log_buffer.hpp:58

void foedus::log::MetaLogControlBlock::initialize ( )

inline

Definition at line 39 of file meta_log_buffer.hpp.

References buffer_used_, durable_offset_, foedus::soc::SharedMutex::initialize(), foedus::soc::SharedPolling::initialize(), logger_wakeup_, mutex_, and oldest_offset_.

Referenced by foedus::log::MetaLogger::initialize_once().

                     {
     mutex_.initialize();
     logger_wakeup_.initialize();
     buffer_used_ = 0;
     oldest_offset_ = 0;
     durable_offset_ = 0;
   }

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void foedus::log::MetaLogControlBlock::uninitialize ( )

inline

Definition at line 46 of file meta_log_buffer.hpp.

References mutex_, and foedus::soc::SharedMutex::uninitialize().

Referenced by foedus::log::MetaLogger::uninitialize_once().

                       {
     mutex_.uninitialize();
   }

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Member Data Documentation

char foedus::log::MetaLogControlBlock::buffer_[1<< 12]

The content of current log buffer.

This must be the first entry to be aligned for direct-IO. We put only one metadata log each time, and metadata log never gets bigger than 4kb, so this is enough.

Definition at line 57 of file meta_log_buffer.hpp.

uint32_t foedus::log::MetaLogControlBlock::buffer_used_

Definition at line 58 of file meta_log_buffer.hpp.

Referenced by has_waiting_log(), initialize(), and foedus::log::operator<<().

uint64_t foedus::log::MetaLogControlBlock::durable_offset_

Offset upto which log entries are fsynced.

Definition at line 62 of file meta_log_buffer.hpp.

Referenced by initialize(), foedus::log::operator<<(), and foedus::savepoint::SavepointManagerPimpl::savepoint_main().

soc::SharedPolling foedus::log::MetaLogControlBlock::logger_wakeup_

the logger sleeps on this variable

Definition at line 70 of file meta_log_buffer.hpp.

Referenced by initialize(), and foedus::log::MetaLogger::uninitialize_once().