Comments (1)
The parentId
for NextTickerWrap
is supposed to be null
. In the final version of AsyncWrap
that will also be the case.
This is because parentId
is only set when a handle was directly created as a result of a another handle. Most popular example is a TCP server (parent) creating a TCP socket (child). The much more normal case is that some JavaScript code invoked for example nextTick
and that way created a handle object. In this case the handle was created from a callback execution and not another handle.
The standard pattern for tracking the parent is:
- track the handle id (
currentId
) for the currently executing callback using thepre
andpost
hooks. - In the
init
hook useparent = parentId === null ? currentId : parentId
.
example: https://github.com/AndreasMadsen/trace/blob/master/trace.js#L49
documentation: https://github.com/nodejs/diagnostics/tree/master/tracing/AsyncWrap#parentuid
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