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Eliza Weisman 4bfa4ffcdf trace-core: Dispatchers unset themselves (#1033 )

This branch changes `dispatcher::get_default` to unset the thread's
current dispatcher while the reference to it is held by the closure.
This prevents infinite loops if the subscriber calls code paths which
emit events or construct spans. 

Note that this also means that nested calls to `get_default` inside of a
`get_default` closure will receive a `None` dispatcher rather than the
"actual" dispatcher. However, it was necessary to unset the default in
`get_default` rather than in dispatch methods such as `Dispatch::enter`,
as when those functions are called, the current state has already been
borrowed.

Before:
```
test enter_span              ... bench:           3 ns/iter (+/- 0)
test span_no_fields          ... bench:          51 ns/iter (+/- 12)
test span_repeatedly         ... bench:       5,073 ns/iter (+/- 1,528)
test span_with_fields        ... bench:          56 ns/iter (+/- 49)
test span_with_fields_record ... bench:         363 ns/iter (+/- 61)
```

After:
```
test enter_span              ... bench:           3 ns/iter (+/- 0)
test span_no_fields          ... bench:          35 ns/iter (+/- 12)
test span_repeatedly         ... bench:       4,165 ns/iter (+/- 298)
test span_with_fields        ... bench:          48 ns/iter (+/- 12)
test span_with_fields_record ... bench:         363 ns/iter (+/- 91)
```

Closes #1032 

Signed-off-by: Eliza Weisman <[email protected]>

2019-04-16 15:51:45 -07:00

src

trace-core: Dispatchers unset themselves (#1033 )

2019-04-16 15:51:45 -07:00

tests

trace-core: Introduce callsite classification in metadata (#1046 )

2019-04-11 11:56:42 -07:00

Cargo.toml

trace-core: add a function to rebuild cached interest (#1039 )

2019-04-10 13:51:05 -07:00

CHANGELOG.md

Prepare tokio-trace-core for initial release. (#979 )

2019-03-13 10:29:27 -07:00

LICENSE

Introduce tokio-trace (#827 )

2019-02-19 12:15:01 -08:00

README.md

Prepare tokio-trace-core for initial release. (#979 )

2019-03-13 10:29:27 -07:00

README.md

tokio-trace-core

Core primitives for tokio-trace.

Documentation

Overview

tokio-trace is a framework for instrumenting Rust programs to collect structured, event-based diagnostic information. This crate defines the core primitives of tokio-trace.

The crate provides:

Span identifies a span within the execution of a program.
Event represents a single event within a trace.
Subscriber, the trait implemented to collect trace data.
Metadata and Callsite provide information describing Spans.
Field, FieldSet, Value, and ValueSet represent the structured data attached to a Span.
Dispatch allows span events to be dispatched to Subscribers.

In addition, it defines the global callsite registry and per-thread current dispatcher which other components of the tracing system rely on.

Application authors will typically not use this crate directly. Instead, they will use the tokio-trace crate, which provides a much more fully-featured API. However, this crate's API will change very infrequently, so it may be used when dependencies must be very stable.

License

This project is licensed under the MIT license.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.