execute_in_process_context(9) [centos man page]

EXECUTE_IN_PROCESS_C(9) 					   Driver Basics					   EXECUTE_IN_PROCESS_C(9)

NAME

       execute_in_process_context - reliably execute the routine with user context

SYNOPSIS

       int execute_in_process_context(work_func_t fn, struct execute_work * ew);

ARGUMENTS

       fn
	   the function to execute

       ew
	   guaranteed storage for the execute work structure (must be available when the work executes)

DESCRIPTION

       Executes the function immediately if process context is available, otherwise schedules the function for delayed execution.

RETURNS

       0 - function was executed 1 - function was scheduled for execution

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   EXECUTE_IN_PROCESS_C(9)

qtimeout(9F)						   Kernel Functions for Drivers 					      qtimeout(9F)

NAME

       qtimeout - execute a function after a specified length of time

SYNOPSIS

       #include <sys/stream.h>
       #include <sys/ddi.h>

       timeout_id_t qtimeout(queue_t *q, void (*func)(void *), void *arg, clock_t ticks);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       q	Pointer to STREAMS queue structure.

       func	Kernel function to invoke when the time increment expires.

       arg	Argument to the function.

       ticks	Number of clock ticks to wait before the function is called. Use drv_usectohz(9F) to convert microseconds to clock ticks.

DESCRIPTION

       The  qtimeout()	function  schedules the specified function func to be called after a specified time interval. func is called with arg as a
       parameter. Control is immediately returned to the caller. This is useful when an event is known to occur within a specific time	frame,	or
       when  you want to wait for I/O processes when an interrupt is not available or might cause problems. The exact time interval over which the
       timeout takes effect cannot be guaranteed, but the value given is a close approximation.

       The qtimeout() function is tailored to be used with the enhanced STREAMS framework interface which is based on the concept  of  perimeters.
       (See mt-streams(9F).) qtimeout() schedules the specified function to execute after entering the perimeters associated with the queue passed
       in as the first parameter to qtimeout(). All outstanding timeouts and bufcalls must be cancelled (using, respectively,  quntimeout(9F)  and
       qunbufcall(9F)) before a driver close routine can block and before the close  routine calls qprocsoff(9F).

       qprocson(9F) must be called before calling qtimeout().

RETURN VALUES

       qtimeout()  returns  an	opaque	non-zero  timeout identifier that can be passed to quntimeout(9F) to cancel the request. Note: No value is
       returned from the called function.

CONTEXT

       qtimeout() can be called from user or interrupt context.

SEE ALSO

       drv_usectohz(9F), mt-streams(9F), qbufcall(9F), qprocson(9F), qunbufcall(9F), quntimeout(9F)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.10							    17 Oct 2002 						      qtimeout(9F)