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Name

Synopsis

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

clock_t drv_hztousec(clock_t hertz);

Interface Level

Architecture independent level 1 (DDI/DKI).

Arguments

hertz

The number of clock ticks to convert.

Description

drv_hztousec() converts into microseconds the time expressed by hertz, which is in system clock ticks.

The kernel variable lbolt, which is (only) readable through drv_getparm(9F) , is the length of time the system has been up since boot and is expressed in clock ticks. Drivers often use the value of lbolt before and after an I/O request to measure the amount of time it took the device to process the request. drv_hztousec() can be used by the driver to convert the reading from clock ticks to a known unit of time.

Return Values

Context

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

See Also

Table of Contents

• Name
• Synopsis
• Interface Level
• Arguments
• Description
• Return Values
• Context
• See Also