KTIME_SUB_NS(9) Driver Basics KTIME_SUB_NS(9)NAME
ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable
SYNOPSIS
ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec);
ARGUMENTS
kt
minuend
nsec
the scalar nsec value to subtract
DESCRIPTION
Returns the subtraction of nsec from kt in ktime_t format
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 KTIME_SUB_NS(9)
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DTK_NANOSLEEP(3) Draw Toolkit manual DTK_NANOSLEEP(3)NAME
dtk_nanosleep - high-resolution sleep
SYNOPSIS
#include <dtk_time.h>
int dtk_nanosleep(int abs, const struct dtk_timespec* req,
struct dtk_timespec* rem);
DESCRIPTION
The function dtk_nanosleep() allows the caller to sleep for an interval with nanosecond precision. If the argument abs is zero, the speci-
fied interval is interpretated as a relative value, otherwise an absolute value. The interval is specified by the req argument which is a
pointer to a dtk_timespec structure defined as:
struct dtk_timespec {
long sec; /* seconds */
long nsec; /* nanoseconds */
};
If interpreted as an absolute value, it represents seconds and nanoseconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC).
dtk_nanosleep() suspends the execution of the calling thread until either at least the time specified by req has elapsed, or a signal is
delivered that causes a signal handler to be called or that terminates the process.
If the call is interrupted by a signal handler, dtk_nanosleep() returns -1, and sets errno to EINTR. In addition, if rem is not NULL, and
abs is zero, it returns the remaining unslept time in rem. This value can then be used to call dtk_nanosleep() again and complete a (rela-
tive) sleep.
RETURN VALUE
On successfully sleeping for the requested interval, dtk_nanosleep() returns 0. If the call is interrupted by a signal handler or encoun-
ters an error, then it returns -1 and errno is set appropriately.
ERRORS
dtk_nanosleep() will fail if:
EINTR The sleep was interrupted by a signal handler.
EINVAL The value in the nsec field was not in the range 0 to 999999999 or sec was negative.
NOTE
This function is a wrapper to clock_nanosleep(2) if it is provided by the system. Otherwise, it implements the function by using the sleep
function with the highest precision available on the system.
SEE ALSO dtk_nanosleep(3), clock_nanosleep(2)EPFL 2011 DTK_NANOSLEEP(3)
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