With the probe! macro, programmers can place static instrumentation
points in their code to mark events of interest. These are compiled into
platform-specific implementations, e.g. SystemTap SDT on Linux. Probes are
designed to have negligible overhead during normal operation, so they can
be present in all builds, and only activated using those external tools.
probe! is available on crates.io.
The recommended way to use it is to add a line into your Cargo.toml such as:
[dependencies]
probe = "0.5"Then use probe::probe; in your code and insert macro calls wherever you want
to mark something, probe!(provider, name, args...). The provider and name
are identifiers of your choice, and any additional arguments are runtime
expressions that will be cast as isize for the probe consumer to read.
There is also a probe_lazy! variant that tries to avoid evaluating the
argument expressions when probes aren't in use, if the platform-specific
implementation allows that to be determined.
probe is distributed under the terms of both the MIT license and the
Apache License (Version 2.0). See LICENSE-APACHE and
LICENSE-MIT for details. Opening a pull request is
assumed to signal agreement with these licensing terms.