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ddi_get_lbolt(9f) [sunos man page]

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

NAME
ddi_get_lbolt - returns the value of lbolt SYNOPSIS
#include <sys/types.h> #include <sys/ddi.h> #include <sys/sunddi.h> clock_t ddi_get_lbolt(void); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). DESCRIPTION
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. RETURN VALUES
ddi_get_lbolt() returns the value of lbolt. CONTEXT
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)

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

NAME
drv_hztousec - convert clock ticks to microseconds SYNOPSIS
#include <sys/types.h> #include <sys/ddi.h> clock_t drv_hztousec(clock_t hertz); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
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, 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 time. RETURN VALUES
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. CONTEXT
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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