Header for shared memory area. More...

#include <ach.h>

Data Fields
uint32_t	magic
	magic number of ach shm files
size_t	len
	length of mmap'ed file
char	name [1+ACH_CHAN_NAME_MAX]
	Name of this channel.
union {
struct {
size_t index_cnt
	number of entries in index
size_t data_size
	size of data bytes
size_t data_head
	offset to first open byte of data
size_t data_free
	number of free data bytes
size_t index_head
	index into index array of first unused index entry
size_t index_free
	number of unused index entries
int anon
	is channel in the heap?
}
uint64_t reserved [16]
	Reserve to compatibly add future variables.
};
struct {
pthread_mutex_t mutex
	mutex for condition variables
pthread_cond_t cond
	condition variable
int dirty
}	sync
	variables for synchronization
uint64_t	last_seq
	last sequence number written

Detailed Description

Header for shared memory area.

There is no tail pointer here. Every subscriber that opens the channel must maintain its own tail pointer.

The documentation for this struct was generated from the following file:

Data Fields