Utility functions to add and remove callbacks, workprocs, and timers.

Functions
int	addCallback (int fd, CBF *fp, void *ud)
int	addTimer (int ms, TCF *fp, void *ud)
int	addWorkProc (WPF *fp, void *ud)
void	rmCallback (int cid)
void	rmTimer (int tid)
void	rmWorkProc (int wid)

---

Function Documentation

int addCallback	(	int	fd,
		CBF *	fp,
		void *	ud
	)

Register a new callback, fp, to be called with ud as argument when fd is ready.

Parameters:

	fd	file descriptor.
	fp	a pointer to the callback function.
	ud	a pointer to be passed to the callback function when called.

Returns:

a unique callback id for use with rmCallback().

int addTimer	(	int	ms,
		TCF *	fp,
		void *	ud
	)

Register a new timer function, fp, to be called with ud as argument after ms.

Add to list in order of decreasing time from epoch, ie, last entry runs soonest. The timer will only invoke the callback function once. You need to call addTimer again if you want to repeat the process.

Parameters:

	ms	timer period in milliseconds.
	fp	a pointer to the callback function.
	ud	a pointer to be passed to the callback function when called.

Returns:

a unique id for use with rmTimer().

int addWorkProc	(	WPF *	fp,
		void *	ud
	)

Add a new work procedure, fp, to be called with ud when nothing else to do.

Parameters:

	fp	a pointer to the work procedure callback function.
	ud	a pointer to be passed to the callback function when called.

Returns:

a unique id for use with rmWorkProc().

void rmCallback

(

int

cid

)

Remove a callback function.

Parameters:

cid

the callback ID returned from addCallback().

void rmTimer

(

int

tid

)

Remove the timer with the given id, as returned from addTimer().

Parameters:

tid

the timer callback ID returned from addTimer().

void rmWorkProc

(

int

wid

)

Remove the work procedure with the given id, as returned from addWorkProc().

Parameters:

wid

the work procedure callback ID returned from addWorkProc().