vtd::RdbTransceiverShm Class Reference

#include <rdb_transceiver_shm.hpp>

Inheritance diagram for vtd::RdbTransceiverShm:

Collaboration diagram for vtd::RdbTransceiverShm:

Public Member Functions
	RdbTransceiverShm (key_t key, uint32_t release_mask)
bool	has () const override
std::vector< std::shared_ptr< RDB_MSG_t > >	receive () override
void	send (const RDB_MSG_t *, size_t) override
void	to_json (cloe::Json &j) const override

Protected Attributes
uint32_t	release_mask_
	VTD uses this mask to notify client when data in buffer is ready.
boost::interprocess::mapped_region	region_
	Shared memory region.
RDB_SHM_HDR_t *	rdb_shm_hdr_ {nullptr}
	Pointer to the shared memory management header.
RDB_SHM_BUFFER_INFO_t **	buffer_info_ {nullptr}
	Array of pointers to buffer information.
RDB_MSG_t **	rdb_msg_ {nullptr}
	Array of pointers to rdb messages.
uint64_t	num_errors_ {0}
uint64_t	num_messages_ {0}

Friends
void	to_json (cloe::Json &j, const RdbTransceiverShm &t)

Detailed Description

This class implements an RDB client via shared memory.

WARNING:

This class is primarily a proof-of-concept. Currently, it is not used and there is no guarantee that it actually works as advertised.

Even if it works, under the hood manual memory-management is used, which means that until it is audited, it may leak memory or worse (ironic, I know).

Constructor & Destructor Documentation

RdbTransceiverShm()

vtd::RdbTransceiverShm::RdbTransceiverShm	(	key_t	key,
		uint32_t	release_mask
	)

Connect to VTD memory to create a new RDB communication.

If a "connection" cannot be achieved, C-strings are thrown.

Parameters

key	to obtain shared memory id
release_mask	mask used by VTD to mask a shared memory region as accessible

Member Function Documentation

has()

bool vtd::RdbTransceiverShm::has ( ) const

inlineoverridevirtual

Returns true when the transceiver has a message that can be received.

That is, if true, then a call to receive() will return a vector that is not empty.

Implements vtd::RdbTransceiver.

receive()

std::vector< std::shared_ptr< RDB_MSG_t > > vtd::RdbTransceiverShm::receive ( )

overridevirtual

Non-blocking function to return all received RDB messages.

Implements vtd::RdbTransceiver.

send()

void vtd::RdbTransceiverShm::send ( const RDB_MSG_t *  msg, size_t  size  )

inlineoverridevirtual

Sends the RDB message with the given size.

Parameters

msg	RDB message
size	number of bytes

Implements vtd::RdbTransceiver.

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

• /home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/optional/vtd/src/rdb_transceiver_shm.hpp
• /home/docs/checkouts/readthedocs.org/user_builds/cloe/checkouts/stable/optional/vtd/src/rdb_transceiver_shm.cpp