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NAME
- WaitIO
-
wait for completion of an I/O request
SYNOPSIS
error = WaitIO(iORequest)
D0 A1
BYTE WaitIO(struct IORequest *);
D0 A1
BYTE WaitIO(struct IORequest *);
FUNCTION
This function waits for the specified I/O request to complete, then removes it from the replyport. If the I/O has already completed, this function will return immediately.
This function should be used with care, as it does not return until the I/O request completes; if the I/O never completes, this function will never return, and your task will hang. If this situation is a possibility, it is safer to use the Wait() function. Wait() will return return when any of a specified set of signal is received. This is how I/O timeouts can be properly handled.
This function should be used with care, as it does not return until the I/O request completes; if the I/O never completes, this function will never return, and your task will hang. If this situation is a possibility, it is safer to use the Wait() function. Wait() will return return when any of a specified set of signal is received. This is how I/O timeouts can be properly handled.
WARNING
If this IORequest was "Quick" or otherwise finished BEFORE this call, this function drops though immediately, with no call to Wait(). A side effect is that the signal bit related the port may remain set. Expect this.
When removing a known complete IORequest from a port, WaitIO() is the preferred method. A simple Remove() would require a Disable()/Enable() pair!
When removing a known complete IORequest from a port, WaitIO() is the preferred method. A simple Remove() would require a Disable()/Enable() pair!
INPUTS
- iORequest
-
pointer to an I/O request block
RESULT
- error
-
zero if successful, else an error is returned (a sign extended copy of io_Error).