ARMEdit_TalkRX (SWI &4BC44) | |||
Check for any waiting messages for this client task | |||
On entry: | R0 = | client handle for this task | |
On exit: | R0 = | pointer to block containing waiting message, or 0 if no messages waiting | |
R1 = | source ID | ||
R2 = | source client handle | ||
Interrupts: | Interrupt status is undefined Fast interrupts are enabled | ||
Processor mode: | Processor is in SVC mode | ||
Re-entrancy: | SWI is not re-entrant | ||
Use: |
Check for any waiting messages. If none are available R0 contains 0 on exit, otherwise it contains a pointer to the first message. The message should be checked, and if it is claimed ARMEdit_TalkAck or ARMEdit_TalkReply should be called to prevent it being passed to other clients. Any information required from the message must be read or copied immediately, since the message could be overwritten by a new message.
The specified source client handle should be used for any reply; unlike the ID it uniquely identifies a particular instantiation of a client. If this call is successful then it should be called again; it is possible for multiple messages to be pending for a single client. | ||
Related SWIs: | ARMEdit_TalkStart, ARMEdit_TalkEnd, ARMEdit_TalkTX, ARMEdit_TalkAck, ARMEdit_TalkReply | ||
Related vectors: | None |
[Contents] [Up] | Copyright © Alexander Thoukydides, 2001 |