ATOMIC_SUB(9) Driver Basics ATOMIC_SUB(9)NAME
atomic_sub - subtract integer from atomic variable
void atomic_sub(int i, atomic_t * v);
integer value to subtract
pointer of type atomic_t
Atomically subtracts i from v.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 ATOMIC_SUB(9)
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SCHEDULE_HRTIMEOUT_R(9) Driver Basics SCHEDULE_HRTIMEOUT_R(9)NAME
schedule_hrtimeout_range - sleep until timeout
int __sched schedule_hrtimeout_range(ktime_t * expires, unsigned long delta, const enum hrtimer_mode mode);
timeout value (ktime_t)
slack in expires timeout (ktime_t)
timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
Make the current task sleep until the given expiry time has elapsed. The routine will return immediately unless the current task state has
been set (see set_current_state).
The delta argument gives the kernel the freedom to schedule the actual wakeup to a time that is both power and performance friendly. The
kernel give the normal best effort behavior for "expires+delta", but may decide to fire the timer earlier, but no earlier than expires.
You can set the task state as follows -
TASK_UNINTERRUPTIBLE - at least timeout time is guaranteed to pass before the routine returns.
TASK_INTERRUPTIBLE - the routine may return early if a signal is delivered to the current task.
The current task state is guaranteed to be TASK_RUNNING when this routine returns.
Returns 0 when the timer has expired otherwise -EINTR
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SCHEDULE_HRTIMEOUT_R(9)
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