Inter-Process Communication prototypes

Functions
syscall	send (int, message)
message	receive (void)
message	recvclr (void)
message	recvtime (int)

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Function Documentation

message receive

(

void

)

receive - wait for a message and return it

Returns:

message

message recvclr

(

void

)

Clear messages, return waiting message (if any)

Returns:

msg if available, NOMSG if no message

message recvtime

(

int

maxwait

)

wait to receive a message or timeout and return result

Parameters:

maxwait

ticks to wait before timeout

Returns:

msg if becomes available, TIMEOUT if no message

syscall send	(	int	pid,
		message	msg
	)

Send a message to another thread.

Parameters:

pid	proc id of recipient
msg	contents of message

Returns:

OK on success, SYSERR on failure