GetFSQHdr
GetFSQHdr Obtain pointer to the file I/O queue header returns address of a 10-byte QHdr structure GetFSQHdr returns the address of the standard Operating System queue used to maintain the linked-list of I/O requests.
qLink field points to the parameter block of the first pending file I/O
request.
Notes: C programmers may prefer to get the address from the global variable
Given this queue header pointer, an application could use the OS Utility
functions En queue and De queue to manipulate the queue elements (I/O
requests), or it could walk through the queue element chain to count how
many requests are pending.
The I/O queue is a series of parameter blocks, linked by the qLink field of
each block.
When using Asynchronous I/O, you may discover that an early request
generated an error, invalidating other subsequent requests. In that case,
you could use FInitQueue to purge the queue, or you could fiddle with the I/O queue elements directly. Be aware that the File Manager does its own
manipulation at interrupt time.