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chore: refine feature flags (#1785)

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Removes dependencies between Tokio feature flags. For example, `process`
should not depend on `sync` simply because it uses the `mpsc` channel.
Instead, feature flags represent **public** APIs that become available
with the feature enabled. When the feature is not enabled, the
functionality is removed. If another Tokio component requires the
functionality, it is stays as `pub(crate)`.

The threaded scheduler is now exposed under `rt-threaded`. This feature
flag only enables the threaded scheduler and does not include I/O,
networking, or time. Those features must be explictly enabled.

A `full` feature flag is added that enables all features.

`stdin`, `stdout`, `stderr` are exposed under `io-std`.

Macros are used to scope code by feature flag.
This commit is contained in:
Carl Lerche
2019-11-18 07:00:55 -08:00
committed by GitHub
parent 13b6e9939e
commit 0d38936b35
49 changed files with 1092 additions and 915 deletions
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tokio-macros/Cargo.toml
+1 -1
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@@ -29,7 +29,7 @@ quote = "1"
syn = { version = "1.0.3", features = ["full"] }
[dev-dependencies]
tokio = { version = "=0.2.0-alpha.6", path = "../tokio", default-features = false, features = ["rt-full"] }
tokio = { version = "=0.2.0-alpha.6", path = "../tokio" }
[package.metadata.docs.rs]
all-features = true