SET ALARM TIME ON DCLOCK LINUX UPDATE
Update the timer's trigger time with sd_event_source_set_time(3)įor the next timer iteration, and reenable the timer using Triggered in regular intervals), set up the timer normally, for In order to set up repetitive timers (that is, timers that are The desired timespan to it, and use the result as the usec In order to set up relative timers (that is, relative to theĬurrent time), retrieve the current time via sd_event_now(3), add Sources that may wake up the system from suspend. Use CLOCK_BOOTTIME_ALARM and CLOCK_REALTIME_ALARM to define event
SET ALARM TIME ON DCLOCK LINUX CODE
Integer, is passed as the exit code parameter to In this case, the userdata parameter, cast to an If the handler parameter to sd_event_add_time() is NULL, and theĮvent source fires, this will be considered a request to exit theĮvent loop. Implicitly when the event loop itself is destroyed. The event source is considered "floating", and will be destroyed Reference to the event source object is returned. If the second parameter of sd_event_add_time() is NULL no Sd_event_source_set_enabled(3) with SD_EVENT_OFF. Referenced, disable the event source using Sure an event source does not fire anymore, even if it is still Loop when all references to the event source are dropped. To destroy an event source object use sd_event_source_unref(3),īut note that the event source is only removed from the event
Time of the event loop iteration, as returned by sd_event_now(3). Sd_event_add_time_relative() is like sd_event_add_time(), but Note that a timer event set to SD_EVENT_ON willįire continuously unless its configured time is updated using Handler function returns a negative error code, it will beĭisabled after the invocation, even if the SD_EVENT_ON mode was This may be changed with sd_event_source_set_enabled(3). To query theĪctual time the handler was called use sd_event_now(3).īy default, the timer will elapse once ( SD_EVENT_ONESHOT), but Prctl(2)), and additional scheduling latencies. The specified accuracy value, the kernel timer slack (see Time, even if it is actually called slightly later, subject to The handler is also passed the configured trigger Will be passed the userdata pointer, which may be chosen freelyīy the caller. The handler parameter shall referenceĪ function to call when the timer elapses. Picking higher accuracy valuesĪllows the system to coalesce timer events more aggressively,
Specifying 60000000µs (1min) or larger for long-running events Use 0 to select theĭefault accuracy (250ms). Parameter specifies an additional accuracy value in µs specifying May be used as an alternative to explicitly disabling a timerĮvent source with sd_event_source_set_enabled(3). Specified as UINT64_MAX the timer event will never elapse, which Immediately and is ready to be dispatched. The past is specified (including 0), this timer source "fires" The usec parameter specifies theĮarliest time, in microseconds (µs), relative to the clock'sĮpoch, when the timer shall be triggered. See timerfd_create(2) for details regarding TheĬlock parameter takes a clock identifier, one of CLOCK_REALTIME,ĬLOCK_MONOTONIC, CLOCK_BOOTTIME, CLOCK_REALTIME_ALARM, orĬLOCK_BOOTTIME_ALARM. The event source object is returned in the source parameter. The event loop object is specified in the event parameter, SYNOPSIS top #include typedef struct sd_event_source sd_event_source typedef int (*sd_event_time_handler_t)(sd_event_source * s, uint64_t usec, void * userdata ) int sd_event_add_time(sd_event * event, sd_event_source ** source, clockid_t clock, uint64_t usec, uint64_t accuracy, sd_event_time_handler_t handler, void * userdata ) int sd_event_add_time_relative(sd_event * event, sd_event_source ** source, clockid_t clock, uint64_t usec, uint64_t accuracy, sd_event_time_handler_t handler, void * userdata ) int sd_event_source_get_time(sd_event_source * source, uint64_t * usec ) int sd_event_source_set_time(sd_event_source * source, uint64_t usec ) int sd_event_source_set_time_relative(sd_event_source * source, uint64_t usec ) int sd_event_source_get_time_accuracy(sd_event_source * source, uint64_t * usec ) int sd_event_source_set_time_accuracy(sd_event_source * source, uint64_t usec ) int sd_event_source_get_time_clock(sd_event_source * source, clockid_t * clock ) DESCRIPTION top sd_event_add_time() adds a new timer event source to an event Sd_event_source_get_time_clock, sd_event_time_handler_t - Add a Sd_event_source_get_time, sd_event_source_set_time, Sd_event_add_time, sd_event_add_time_relative, SD_EVENT_ADD_TIME(3) sd_event_add_time SD_EVENT_ADD_TIME(3) NAME top
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