STRUCT HRTIMER(9) Driver Basics STRUCT HRTIMER(9)NAME
struct_hrtimer - the basic hrtimer structure
SYNOPSIS
struct hrtimer {
struct timerqueue_node node;
ktime_t _softexpires;
enum hrtimer_restart (* function) (struct hrtimer *);
struct hrtimer_clock_base * base;
unsigned long state;
#ifdef CONFIG_TIMER_STATS
int start_pid;
void * start_site;
char start_comm[16];
#endif
};
MEMBERS
node
timerqueue node, which also manages node.expires, the absolute expiry time in the hrtimers internal representation. The time is related
to the clock on which the timer is based. Is setup by adding slack to the _softexpires value. For non range timers identical to
_softexpires.
_softexpires
the absolute earliest expiry time of the hrtimer. The time which was given as expiry time when the timer was armed.
function
timer expiry callback function
base
pointer to the timer base (per cpu and per clock)
state
state information (See bit values above)
start_pid
timer statistics field to store the pid of the task which started the timer
start_site
timer statistics field to store the site where the timer was started
start_comm[16]
timer statistics field to store the name of the process which started the timer
DESCRIPTION
The hrtimer structure must be initialized by hrtimer_init
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 STRUCT HRTIMER(9)
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SCHEDULE_HRTIMEOUT_R(9) Driver Basics SCHEDULE_HRTIMEOUT_R(9)NAME
schedule_hrtimeout_range - sleep until timeout
SYNOPSIS
int __sched schedule_hrtimeout_range(ktime_t * expires, unsigned long delta, const enum hrtimer_mode mode);
ARGUMENTS
expires
timeout value (ktime_t)
delta
slack in expires timeout (ktime_t)
mode
timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL
DESCRIPTION
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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