db_manage.c File Reference

Management of a DB file. More...

#include <stdlib.h>
#include <sys/fcntl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include "odb.h"
#include "op_string.h"
#include "op_libiberty.h"

Include dependency graph for db_manage.c:

Defines
#define	_GNU_SOURCE
#define	DEFAULT_NODE_NR(offset_node) 128
#define	FILES_HASH_SIZE 512
Functions
int	odb_grow_hashtable (odb_data_t *data)
	grow the hashtable in such way current_size is the index of the first free node.
void	odb_init (odb_t *odb)
	odb_init - initialize a DB file
int	odb_open (odb_t odb, char const filename, enum odb_rw rw, size_t sizeof_header)
void	odb_close (odb_t *odb)
	Close the given ODB file.
int	odb_open_count (odb_t const *odb)
	return the number of times this sample file is open
void *	odb_get_data (odb_t *odb)
	return the start of the mapped data
void	odb_sync (odb_t const *odb)
	issue a msync on the used size of the mmaped file

Detailed Description

Management of a DB file.

Remarks:: Copyright 2002 OProfile authors; Read the file COPYING

Author:: Philippe Elie

Define Documentation

#define _GNU_SOURCE

#define DEFAULT_NODE_NR ( offset_node ) 128

Referenced by odb_open().

#define FILES_HASH_SIZE 512

Function Documentation

void odb_close ( odb_t * odb )

Close the given ODB file.

References odb_data::base_memory, odb_t::data, odb_data::descr, odb_data::fd, odb_data::filename, odb_data::list, odb_data::ref_count, and odb_descr_t::size.

Referenced by main(), and opd_close_image_samples_files().

void* odb_get_data ( odb_t * odb )

return the start of the mapped data

References odb_data::base_memory, and odb_t::data.

Referenced by import_from_abi(), main(), opd_open_24_sample_file(), opd_open_sample_file(), and operf_open_sample_file().

int odb_grow_hashtable ( odb_data_t * data )

grow the hashtable in such way current_size is the index of the first free node.

Take care all node pointer can be invalidated by this call.

Node allocation is done in a two step way 1st) ensure a free node exist eventually, caller can setup it, 2nd) commit the node allocation with odb_commit_reservation(). This is done in this way to ensure node setup is visible from another process like pp tools in an atomic way.

returns 0 on success, non zero on failure in this case this function do nothing and errno is set by the first libc call failure allowing to retry after cleanup some program resource.

References odb_data::base_memory, BUCKET_FACTOR, odb_descr_t::current_size, odb_data::descr, odb_data::fd, odb_data::hash_base, odb_data::hash_mask, odb_node_t::key, odb_node_t::next, odb_data::node_base, and odb_descr_t::size.