I/O primitives layer

Collaboration diagram for I/O primitives layer:

Classes
struct	default_completion_handler
	Default completion handler class. More...
class	file
	Defines interface of file. More...
class	request
	Defines interface of request. More...
class	request_ptr
	A smart wrapper for request pointer. More...
class	disk_queues
	Encapsulates disk queues. More...
class	stats
	Collects various I/O statistics. More...
Modules
	File implementations
Functions
int	wait_any (request_ptr req_array[], int count)
	Collection of functions to track statuses of a number of requests.
void	wait_all (request_ptr req_array[], int count)
	Suspends calling thread until all requests are completed.
bool	poll_any (request_ptr req_array[], int count, int &index)
	Polls requests.

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Detailed Description

Group of classes which enable abstraction from operating system calls and support system-independent interfaces for asynchronous I/O.

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Function Documentation

bool poll_any	(	request_ptr	req_array[],
		int	count,
		int &	index
	)			[inline]

Polls requests.

Parameters:

	req_array	array of request_ptr objects
	count	size of req_array
	index	contains index of the first completed request if any

Returns:

true if any of requests is completed, then index contains valid value, otherwise false

void wait_all	(	request_ptr	req_array[],
		int	count
	)			[inline]

Suspends calling thread until all requests are completed.

Parameters:

	req_array	array of request_ptr objects
	count	size of req_array

Examples:

io/test_io.cpp, and mng/test_mng.cpp.

Referenced by stream::check_sorted_runs(), and ksort().

int wait_any	(	request_ptr	req_array[],
		int	count
	)			[inline]

Collection of functions to track statuses of a number of requests.

Suspends calling thread until any of requests is completed

Parameters:

	req_array	array of request_ptr objects
	count	size of req_array

Returns:

index in req_array pointing to the first completed request

Referenced by buffered_writer< block_type >::get_free_block(), and write_pool< block_type >::steal().