net_instaweb::SharedCircularBuffer Class Reference

#include "shared_circular_buffer.h"

Inheritance diagram for net_instaweb::SharedCircularBuffer:

Public Member Functions
	SharedCircularBuffer (AbstractSharedMem *shm_runtime, const int buffer_capacity, const GoogleString &filename_prefix, const GoogleString &filename_suffix)
bool	InitSegment (bool parent, MessageHandler *handler)
void	Clear ()
	Reset circular buffer.
virtual bool	Write (const StringPiece &message, MessageHandler *handler)
	Write content to circular buffer.
virtual bool	Flush (MessageHandler *message_handler)
virtual bool	Dump (Writer *writer, MessageHandler *handler)
	Write content of data in buffer to writer, without clearing the buffer.
GoogleString	ToString (MessageHandler *handler)
	Return data content as string. This is for test purposes.
void	GlobalCleanup (MessageHandler *handler)

Detailed Description

Shared memory circular buffer, the content of its shared memory segment is a Mutex and a CircularBuffer. In parent process, we initialize a shared memory segment. Then we create a SharedCircularBuffer object in each process and attach it to the segment by calling InitSegment(true, handler) once in the parent process and calling InitSegment(false, handler) in each child.

Constructor & Destructor Documentation

net_instaweb::SharedCircularBuffer::SharedCircularBuffer	(	AbstractSharedMem *	shm_runtime,
		const int	buffer_capacity,
		const GoogleString &	filename_prefix,
		const GoogleString &	filename_suffix
	)

Construct with shared memory, data buffer capacity, filename_prefix and filename_suffix. filename_prefix and filename_suffix are used to name segment for the shared circular buffer.

Member Function Documentation

void net_instaweb::SharedCircularBuffer::GlobalCleanup

(

MessageHandler *

handler

)

This should be called from the root process as it is about to exit, when no future children are expected to start.

bool net_instaweb::SharedCircularBuffer::InitSegment	(	bool	parent,
		MessageHandler *	handler
	)

Initialize the shared memory segment. parent = true if this is invoked in root process – initialize the shared memory; parent = false if this is invoked in child process – attach to existing segment.

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

• pagespeed/kernel/sharedmem/shared_circular_buffer.h