ddi_get_lbolt(9F) Kernel Functions for Drivers ddi_get_lbolt(9F)NAME
ddi_get_lbolt - returns the value of lbolt
Solaris DDI specific (Solaris DDI).
ddi_get_lbolt() returns the value of lbolt where lbolt is an integer that represents the number of clock ticks since the last system
reboot. This value is used as a counter or timer inside the system kernel. The tick frequency can be determined by using drv_usectohz(9F)
which converts microseconds into clock ticks.
ddi_get_lbolt() returns the value of lbolt.
This routine can be called from any context.
SEE ALSO ddi_get_time(9F), drv_getparm(9F), drv_usectohz(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 18 Feb 1998 ddi_get_lbolt(9F)
Check Out this Related Man Page
drv_hztousec(9F) Kernel Functions for Drivers drv_hztousec(9F)NAME
drv_hztousec - convert clock ticks to microseconds
clock_t drv_hztousec(clock_t hertz);
Architecture independent level 1 (DDI/DKI).
hertz The number of clock ticks to convert.
drv_hztousec() converts into microseconds the time expressed by hertz, which is in system clock ticks.
The kernel variable lbolt, whose value should be retrieved by calling ddi_get_lbolt(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
The number of microseconds equivalent to the hertz parameter. No error value is returned. If the microsecond equivalent to hertz is too
large to be represented as a clock_t, then the maximum clock_t value will be returned.
drv_hztousec() can be called from user or interrupt context.
SEE ALSO ddi_get_lbolt(9F), drv_usectohz(9F), drv_usecwait(9F)
Writing Device Drivers
SunOS 5.10 12 Nov 1992 drv_hztousec(9F)
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