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 2.6. July 2010 EXECUTE_IN_PROCESS_C(9)
Check Out this Related Man Page
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)
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