sharedim_stack< IMDATA_TYPE > Class Template Reference

Class to manage a stack of images in shared memory. More...

#include <sharedim_stack.h>

Public Member Functions
	sharedim_stack ()
	Constructor.
void *	get_shmemptr ()
key_t	get_shmemkey ()
int	get_shmemid ()
size_t	get_shmemsz ()
int	get_n_images ()
	Returns the value of n_images currently in the header.
int	set_max_n_images (int mni)
	Sets max_n_images in the header.
int	get_max_n_images ()
	Returns the value of max_n_images currently in the header.
int	get_last_image ()
	Returns the value of last_image currently in the header.
int	get_last_image_abs ()
sharedim< IMDATA_TYPE > *	calc_im_pos (int imno)
	Calculates the offset of the image given by imno, takes into account max_n_images and available space.
int	set_saved (int imno, int sv)
	Update the saved field of this image.
int	create_shm (key_t mkey, size_t sz)
	For the writer process, creates then attaches the shared memory.
int	create_shm (key_t mkey, int nims, size_t imsz)
	For the writer process, creates then attaches the shared memory.
int	attach_shm (key_t mkey)
	Attachess the shared memory. A Reader process should start here.
sharedim< IMDATA_TYPE > *	set_next_image (int nx, int ny)
	Sets the next image, and returns a pointer to it, but does not increment last_image.
int	enable_next_image ()
	Increments last_image.
sharedim< IMDATA_TYPE >	get_image (int imno)
	Gets an image, as a sharedim structure, with the imdata pointer properly set for the calling process.

Public Attributes
sharedim_stack_header *	header
	Convenient pointer to the stack header, has same value as shmemptr.
int	next_last_image

Protected Attributes
void *	shmemptr
	The pointer to the shared memory block.
key_t	shmemkey
	The key used to lookup the shared memory.
int	shmemid
	The shared memory id.
size_t	shmemsz
	Size of the shared memory block.
intptr_t *	image_list
	Convenient pointer to the list of image offsets.
struct shmid_ds	shmstats
	Used to retrieve shared memory block size.

Detailed Description

template<class IMDATA_TYPE>
class sharedim_stack< IMDATA_TYPE >

Can be used by both the writer and the readers

Definition at line 101 of file sharedim_stack.h.

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

• sharedim_stack.h
• sharedim_stack.cpp