89 lines
2.7 KiB
ReStructuredText
89 lines
2.7 KiB
ReStructuredText
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.. _timer:
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:c:type:`uv_timer_t` --- Timer handle
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=====================================
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Timer handles are used to schedule callbacks to be called in the future.
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Data types
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----------
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.. c:type:: uv_timer_t
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Timer handle type.
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.. c:type:: void (*uv_timer_cb)(uv_timer_t* handle)
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Type definition for callback passed to :c:func:`uv_timer_start`.
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Public members
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^^^^^^^^^^^^^^
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N/A
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.. seealso:: The :c:type:`uv_handle_t` members also apply.
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API
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---
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.. c:function:: int uv_timer_init(uv_loop_t* loop, uv_timer_t* handle)
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Initialize the handle.
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.. c:function:: int uv_timer_start(uv_timer_t* handle, uv_timer_cb cb, uint64_t timeout, uint64_t repeat)
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Start the timer. `timeout` and `repeat` are in milliseconds.
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If `timeout` is zero, the callback fires on the next event loop iteration.
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If `repeat` is non-zero, the callback fires first after `timeout`
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milliseconds and then repeatedly after `repeat` milliseconds.
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.. note::
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Does not update the event loop's concept of "now". See :c:func:`uv_update_time` for more information.
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If the timer is already active, it is simply updated.
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.. c:function:: int uv_timer_stop(uv_timer_t* handle)
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Stop the timer, the callback will not be called anymore.
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.. c:function:: int uv_timer_again(uv_timer_t* handle)
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Stop the timer, and if it is repeating restart it using the repeat value
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as the timeout. If the timer has never been started before it returns
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UV_EINVAL.
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.. c:function:: void uv_timer_set_repeat(uv_timer_t* handle, uint64_t repeat)
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Set the repeat interval value in milliseconds. The timer will be scheduled
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to run on the given interval, regardless of the callback execution
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duration, and will follow normal timer semantics in the case of a
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time-slice overrun.
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For example, if a 50ms repeating timer first runs for 17ms, it will be
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scheduled to run again 33ms later. If other tasks consume more than the
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33ms following the first timer callback, then the callback will run as soon
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as possible.
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.. note::
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If the repeat value is set from a timer callback it does not immediately take effect.
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If the timer was non-repeating before, it will have been stopped. If it was repeating,
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then the old repeat value will have been used to schedule the next timeout.
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.. c:function:: uint64_t uv_timer_get_repeat(const uv_timer_t* handle)
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Get the timer repeat value.
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.. c:function:: uint64_t uv_timer_get_due_in(const uv_timer_t* handle)
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Get the timer due value or 0 if it has expired. The time is relative to
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:c:func:`uv_now()`.
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.. versionadded:: 1.40.0
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.. seealso:: The :c:type:`uv_handle_t` API functions also apply.
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