geopm::IOUringFallback Class Reference

Fallback implementation of the IOUring batch interface. This implementation uses queues of individual read/write operations instead of a single batched operation. More...

#include <IOUringFallback.hpp>

Inheritance diagram for geopm::IOUringFallback:

Collaboration diagram for geopm::IOUringFallback:

Public Member Functions
	IOUringFallback (unsigned entries)
virtual	~IOUringFallback ()
void	submit () override
	Submit all prepared uring operations in a batch, and wait for all operations to return a result. Throws if there are errors interacting with the completion queue. Failures of batched operations are reported by ret from the operation's respective prep_... function call, and do not cause this function to throw. More...
void	prep_read (std::shared_ptr< int > ret, int fd, void *buf, unsigned nbytes, off_t offset) override
	Perform a pread in the next batch submission. More...
void	prep_write (std::shared_ptr< int > ret, int fd, const void *buf, unsigned nbytes, off_t offset) override
	Perform a pwrite in the next batch submission. More...
Public Member Functions inherited from geopm::IOUring
	IOUring ()=default
	Create and initialize an IO uring. More...
virtual	~IOUring ()=default
	Clean up the IO uring. More...

Static Public Member Functions
static std::unique_ptr< IOUring >	make_unique (unsigned entries)
	Create a fallback implementation of IOUring that uses non-batched IO operations, in case we cannot use IO uring or liburing. More...
Static Public Member Functions inherited from geopm::IOUring
static std::unique_ptr< IOUring >	make_unique (unsigned entries)
	Create an object that supports an io_uring-like interface. The created object uses io_uring if supported, otherwise uses individual read/write operations. More...

Detailed Description

Fallback implementation of the IOUring batch interface. This implementation uses queues of individual read/write operations instead of a single batched operation.

Constructor & Destructor Documentation

IOUringFallback()

geopm::IOUringFallback::IOUringFallback

(

unsigned

entries

)

~IOUringFallback()

geopm::IOUringFallback::~IOUringFallback ( )

virtual

Member Function Documentation

make_unique()

std::unique_ptr< IOUring > geopm::IOUringFallback::make_unique ( unsigned  entries )

static

Create a fallback implementation of IOUring that uses non-batched IO operations, in case we cannot use IO uring or liburing.

Parameters

entries

The expected maximum number of batched operations.

prep_read()

void geopm::IOUringFallback::prep_read ( std::shared_ptr< int >  ret, int  fd, void *  buf, unsigned  nbytes, off_t  offset  )

overridevirtual

Perform a pread in the next batch submission.

Parameters

ret	Where to store the operation's return value, which will be a non-negative number of bytes read, or -errno on failure, after submit() returns.
fd	Which already-opened file to read.
buf	Where to store the read data.
nbytes	Number of bytes to read into buf.
offset	Offset within fd to start the pread. -1 uses the existing offset of fd, like in read().

Exceptions

if	the queue is already full.

Implements geopm::IOUring.

prep_write()

void geopm::IOUringFallback::prep_write ( std::shared_ptr< int >  ret, int  fd, const void *  buf, unsigned  nbytes, off_t  offset  )

overridevirtual

Perform a pwrite in the next batch submission.

Parameters

ret	Where to store the operation's return value, which will be a non-negative number of bytes written, or -errno on failure, after submit() returns.
fd	Which already-opened file to write.
buf	Which data to write to the file.
nbytes	Number of bytes to write from buf.
offset	Offset within fd to start the pwrite. -1 uses the existing offset of fd, like in write().

Exceptions

if	the queue is already full.

Implements geopm::IOUring.

submit()

void geopm::IOUringFallback::submit ( )

overridevirtual

Submit all prepared uring operations in a batch, and wait for all operations to return a result. Throws if there are errors interacting with the completion queue. Failures of batched operations are reported by ret from the operation's respective prep_... function call, and do not cause this function to throw.

Implements geopm::IOUring.

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

• IOUringFallback.hpp
• IOUringFallback.cpp