3.8. Receiving Messages and Events

Cogent C API and Utilities : Version 5.4
	Chapter 3. Interprocess Communication

3.8. Receiving Messages and Events

The Cogent IP_* functions unify the process event space by treating all forms of input and notification as events.

IP_SetGUIHandler - sets callback functions for GUI events.
IP_Receive - receives any message.
IP_ReceiveNonblock - receives any message, without blocking.
IP_AddFDHandler - tells IP_Receive to accept file input.
IP_RemoveFDHandler - prevents IP_Receive from accepting file input.
IP_SelectFD - is used internally only.
IP_UnselectFD - is used internally only.
IP_ProcessMessage - classifies messages for IP_Receive.

The IP_Receive function can accept input from the following sources:

a message from another process using the Cogent IP_* functions
a message from another process using the OS IPC primitives
an asynchronous message via Cascade QueueServer
data available on a file descriptor
a pulse
a signal
a Photon microGUI event
a task death notification for _PPF_INFORMED tasks (QNX 4 and Linux)


3.7. Cascade QueueServer Functions		3.9. Replying to Messages

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