dir_watch.cpp File Reference

#include "precompiled.h"
#include "lib/sysdep/dir_watch.h"

Include dependency graph for dir_watch.cpp:

Functions
Status	dir_watch_Add (const OsPath &path, PDirWatch &dirWatch)
	start watching a single directory for changes. More...
Status	dir_watch_Poll (DirWatchNotifications &notifications)
	return all pending directory watch notifications. More...

Function Documentation

dir_watch_Add()

Status dir_watch_Add	(	const OsPath &	path,
		PDirWatch &	dirWatch
	)

start watching a single directory for changes.

Parameters

path	(must end in slash)
dirWatch	opaque smart pointer to the watch state; used to manage its lifetime (this is deemed more convenient than a separate dir_watch_Remove interface).

clients typically want to watch entire directory subtrees (e.g. a mod), which is supported by Windows but not FAM. to reduce overhead, the Windows backend always watches subtrees, but portable clients should still add a watch for each subdirectory (the shared watch state is reference-counted). rationale: since the VFS has per-directory data structures, it is convenient to store PDirWatch there instead of creating a second tree structure here.

dir_watch_Poll()

Status dir_watch_Poll

(

DirWatchNotifications &

notifications

)

return all pending directory watch notifications.

Parameters

notifications

receives any pending notifications in unspecified order.

Returns

Status (INFO::OK doesn't imply notifications were returned)

note: the run time of this function is independent of the number of directory watches and number of files.

rationale for a polling interface: users (e.g. the main game loop) typically want to receive change notifications at a single point, rather than deal with the complexity of asynchronous notifications.