Wed Aug 18 22:34:38 2010

Asterisk developer's documentation


eventqent Struct Reference
[AMI functions]


Data Fields

int category
struct {
   eventqent *   next
eq_next
char eventdata [1]
unsigned int seq
int usecount

Detailed Description

Linked list of events. Global events are appended to the list by append_event(). The usecount is the number of stored pointers to the element, excluding the list pointers. So an element that is only in the list has a usecount of 0, not 1.

Clients have a pointer to the last event processed, and for each of these clients we track the usecount of the elements. If we have a pointer to an entry in the list, it is safe to navigate it forward because elements will not be deleted, but only appended. The worst that can happen is seeing the pointer still NULL.

When the usecount of an element drops to 0, and the element is the first in the list, we can remove it. Removal is done within the main thread, which is woken up for the purpose.

For simplicity of implementation, we make sure the list is never empty.

Definition at line 112 of file manager.c.


Field Documentation

int category

Definition at line 114 of file manager.c.

Referenced by action_getconfig(), action_getconfigjson(), action_listcategories(), and handle_updates().

struct { ... } eq_next

Referenced by handle_showmaneventq(), purge_events(), and unref_event().

char eventdata[1]

really variable size, allocated by append_event()

Definition at line 117 of file manager.c.

struct eventqent* next

Definition at line 116 of file manager.c.

Referenced by ast_instring().

unsigned int seq

sequence number

Definition at line 115 of file manager.c.

int usecount

# of clients who still need the event

Definition at line 113 of file manager.c.

Referenced by grab_last(), purge_events(), ref_event(), and unref_event().


The documentation for this struct was generated from the following file:
Generated on Wed Aug 18 22:34:38 2010 for Asterisk - the Open Source PBX by  doxygen 1.4.7