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.. _metrics:
Metrics operations
======================
libuv provides a metrics API to track various internal operations of the event
loop.
Data types
----------
.. c:type:: uv_metrics_t
The struct that contains event loop metrics. It is recommended to retrieve
these metrics in a :c:type:`uv_prepare_cb` in order to make sure there are
no inconsistencies with the metrics counters.
::
typedef struct {
uint64_t loop_count;
uint64_t events;
uint64_t events_waiting;
/* private */
uint64_t* reserved[13];
} uv_metrics_t;
Public members
^^^^^^^^^^^^^^
.. c:member:: uint64_t uv_metrics_t.loop_count
Number of event loop iterations.
.. c:member:: uint64_t uv_metrics_t.events
Number of events that have been processed by the event handler.
.. c:member:: uint64_t uv_metrics_t.events_waiting
Number of events that were waiting to be processed when the event provider
was called.
API
---
.. c:function:: uint64_t uv_metrics_idle_time(uv_loop_t* loop)
Retrieve the amount of time the event loop has been idle in the kernel's
event provider (e.g. ``epoll_wait``). The call is thread safe.
The return value is the accumulated time spent idle in the kernel's event
provider starting from when the :c:type:`uv_loop_t` was configured to
collect the idle time.
.. note::
The event loop will not begin accumulating the event provider's idle
time until calling :c:type:`uv_loop_configure` with
:c:type:`UV_METRICS_IDLE_TIME`.
.. versionadded:: 1.39.0
.. c:function:: int uv_metrics_info(uv_loop_t* loop, uv_metrics_t* metrics)
Copy the current set of event loop metrics to the ``metrics`` pointer.
.. versionadded:: 1.45.0
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