parport_yield man page on Scientific

parport_yield man page on Scientific

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PARPORT_YIELD(9)	     Parallel Port Devices	      PARPORT_YIELD(9)

NAME
       parport_yield - relinquish a parallel port temporarily

SYNOPSIS
       int parport_yield(struct pardevice * dev);

ARGUMENTS
       dev
	   a device on the parallel port

DESCRIPTION
       This function relinquishes the port if it would be helpful to other
       drivers to do so. Afterwards it tries to reclaim the port using
       parport_claim, and the return value is the same as for parport_claim.
       If it fails, the port is left unclaimed and it is the driver´s
       responsibility to reclaim the port.

       The parport_yield and parport_yield_blocking functions are for marking
       points in the driver at which other drivers may claim the port and use
       their devices. Yielding the port is similar to releasing it and
       reclaiming it, but is more efficient because no action is taken if
       there are no other devices needing the port. In fact, nothing is done
       even if there are other devices waiting but the current device is still
       within its “timeslice”. The default timeslice is half a second, but it
       can be adjusted via the /proc interface.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		      PARPORT_YIELD(9)

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