sion_buffer.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "sion.h"
#include "sion_debug.h"
#include "sion_error_handler.h"
#include "sion_internal.h"
#include "sion_buffer.h"

Include dependency graph for sion_buffer.c:

Go to the source code of this file.

Macros
#define	_XOPEN_SOURCE   700
#define	DFUNCTION   "_sion_buffer_check_env"
#define	DFUNCTION   "_sion_buffer_init"
#define	DFUNCTION   "_sion_buffer_push"
#define	DFUNCTION   "_sion_buffer_get_data_ptr"
#define	DFUNCTION   "_sion_buffer_flush"

Functions
int	_sion_buffer_check_env (_sion_filedesc *sion_filedesc)
	Checks if environment variables are set to use buffer. More...
int	_sion_buffer_init (_sion_filedesc *sion_filedesc)
	Allocate and initalize the buffer. More...
sion_int64	_sion_buffer_push (_sion_filedesc *sion_filedesc, const void *data, sion_int64 bytes)
	Push data to buffer. More...
int	_sion_buffer_get_data_ptr (_sion_filedesc *sion_filedesc, void **data, sion_int64 *bytes)
	Pop all data from buffer. More...
int	_sion_buffer_flush (_sion_filedesc *sion_filedesc)
	Flush buffer. More...

Detailed Description

This functions control and manage a memory based buffer for sion files. Depending on a set of environment variables the buffer will work as write-through or as write-back buffer. On Unix systems a POSIX shared memory segment will be used, on Blue Gene/P it is persistent memory.

A buffer of n MB will store the last n MB of data per task in the buffer. If the buffer memory is filled, the full buffer will be written to disk and the buffer will be exhausted.

Definition in file sion_buffer.c.

Function Documentation

_sion_buffer_check_env()

int _sion_buffer_check_env

(

_sion_filedesc *

sion_filedesc

)

Checks if environment variables are set to use buffer.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if env could be checked

Definition at line 60 of file sion_buffer.c.

_sion_buffer_flush()

int _sion_buffer_flush

(

_sion_filedesc *

sion_filedesc

)

Flush buffer.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if ok

Definition at line 177 of file sion_buffer.c.

_sion_buffer_get_data_ptr()

int _sion_buffer_get_data_ptr	(	_sion_filedesc *	sion_filedesc,
		void **	data,
		sion_int64 *	bytes
	)

Pop all data from buffer.

Parameters

*sion_filedesc	sion file description struct (_sion_filedesc)
*data	pointer to data
*bytes	number of bytes in buffer

Returns

1 if there is data to process 0 not data in buffer

Definition at line 152 of file sion_buffer.c.

References _sion_filedesc_struct::buffer, and _sion_filedesc_struct::buffer_ptr.

_sion_buffer_init()

int _sion_buffer_init

(

_sion_filedesc *

sion_filedesc

)

Allocate and initalize the buffer.

Parameters

*sion_filedesc

sion file description struct (_sion_filedesc)

Returns

SION_SUCCESS if ok

Definition at line 81 of file sion_buffer.c.

_sion_buffer_push()

sion_int64 _sion_buffer_push	(	_sion_filedesc *	sion_filedesc,
		const void *	data,
		sion_int64	bytes
	)

Push data to buffer.

Parameters

*sion_filedesc	sion file description struct (_sion_filedesc)
*data	pointer to data
*bytes	number of bytes to push

Returns

number of bytes stored

Definition at line 106 of file sion_buffer.c.