gr_buffer.h File Reference

#include <gr_core_api.h>
#include <gr_runtime_types.h>
#include <boost/weak_ptr.hpp>
#include <gruel/thread.h>
#include <gr_tags.h>
#include <deque>

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Classes
class	gr_buffer
	Single writer, multiple reader fifo. More...
class	gr_buffer_reader
	How we keep track of the readers of a gr_buffer. More...
Functions
GR_CORE_API gr_buffer_sptr	gr_make_buffer (int nitems, size_t sizeof_item, gr_block_sptr link=gr_block_sptr())
	Allocate a buffer that holds at least nitems of size sizeof_item.
GR_CORE_API gr_buffer_reader_sptr	gr_buffer_add_reader (gr_buffer_sptr buf, int nzero_preload, gr_block_sptr link=gr_block_sptr())
	Create a new gr_buffer_reader and attach it to buffer buf.
GR_CORE_API long	gr_buffer_ncurrently_allocated ()
	returns # of gr_buffers currently allocated
GR_CORE_API long	gr_buffer_reader_ncurrently_allocated ()
	returns # of gr_buffer_readers currently allocated

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Function Documentation

GR_CORE_API gr_buffer_reader_sptr gr_buffer_add_reader	(	gr_buffer_sptr	buf,
		int	nzero_preload,
		gr_block_sptr	link = gr_block_sptr()
	)

Create a new gr_buffer_reader and attach it to buffer buf.

Parameters:

buf	is the buffer the gr_buffer_reader reads from.
nzero_preload	-- number of zero items to "preload" into buffer.
link	is the block that reads from the buffer using this gr_buffer_reader.

GR_CORE_API long gr_buffer_ncurrently_allocated

(

)

returns # of gr_buffers currently allocated

GR_CORE_API long gr_buffer_reader_ncurrently_allocated

(

)

returns # of gr_buffer_readers currently allocated

GR_CORE_API gr_buffer_sptr gr_make_buffer	(	int	nitems,
		size_t	sizeof_item,
		gr_block_sptr	link = gr_block_sptr()
	)

Allocate a buffer that holds at least nitems of size sizeof_item.

The total size of the buffer will be rounded up to a system dependent boundary. This is typically the system page size, but under MS windows is 64KB.

Parameters:

nitems	is the minimum number of items the buffer will hold.
sizeof_item	is the size of an item in bytes.
link	is the block that writes to this buffer.