Receive State

In Receive state, a local TP can receive data and control information from a remote TP. A local TP can enter Receive state from Send state by calling either MCPrepToRcv or MCRcvAndWait. Both of these intrinsics cause the local side of the conversation to change from Send state to Receive state and the remote side to change from Receive state to Send state.

Since the TP in Send state controls the conversation, a TP in Receive state must wait to be placed in Send state by the controlling TP. A local TP in Receive state can request to enter Send state by calling the MCReqToSend intrinsic. The remote TP in Send state receives the request, enters Receive state, and places the local TP in Send state.

	NOTE: If a TP in Receive state detects an error, it can enter Send state directly by calling MCSendError.

Table 4-4 “Receive State Intrinsics” lists the intrinsics that can be called from Receive state. It also indicates what state the TP is in after each intrinsic executes successfully. MCRcvAndWait and MCRcvNoWait can place the local side of the conversation in several different states, depending on the type of information received from the remote TP.

From Receive state, the MCDeallocate intrinsic can be called only with the DeallocateType parameter set to 2 (ABEND). See the description of MCDeallocate in Chapter 5 “ Intrinsic Descriptions” for more information.