Bump tokio from 0.1.22 to 0.2.15

[dependabot-preview]

Bumps tokio from 0.1.22 to 0.2.15.

Release notes

Sourced from tokio's releases.

Tokio v0.2.15

Fixes a queue regression and adds a new disarm fn to mpsc::Sender.

Fixes

• rt: fix queue regression (#2362).

Added

• sync: Add disarm to mpsc::Sender (#2358).

Tokio v0.2.14

This release introduces automatic cooperative task yielding. This article describes the new functionality in more detail.

Fixes

• rt: concurrency bug in scheduler (#2273).
• rt: concurrency bug with shell runtime (#2333).
• test-util: correct pause/resume of time (#2253).
• time: DelayQueue correct wakeup after insert (#2285).

Added

• io: impl RawFd, AsRawHandle for std io types (#2335).
• rt: automatic cooperative task yielding (#2160, #2343, #2349).
• sync: RwLock::into_inner (#2321).

Changed

• sync: semaphore, mutex internals rewritten to avoid allocations (#2325).

Tokio v0.2.13

Fixes a minor bug in the previous release that resulted in compilation errors using the new pin! form.

Fixes

• macros: unresolved import in pin! (#2281).

Tokio v0.2.12

Polish, small additions, and fixes. The biggest additions in this release are StreamMap and Notify.

StreamMap

Similar to StreamExt::merge, StreamMap supports merging multiple source streams into a single stream, producing items as they become available in the source streams. However, StreamMap supports inserting and removing streams at run-time. This is useful for cases where a consumer wishes to subscribe to messages from multiple sources and dynamically manage those subscriptions.

As the name implies, StreamMap maps keys to streams. Streams are [inserted] or [removed] as needed and then the StreamMap is used as any other stream. Items are returned with their keys, enabling the caller to identify which source stream the item originated from.

Example

use tokio::stream::{StreamExt, StreamMap};
use tokio::sync::mpsc;
#[tokio::main]
</tr></table> ... (truncated)

Commits

• 2a8d917 chore: Prepare 0.2.15 release (#2365)
• 7fb1698 sync: Add disarm to mpsc::Sender (#2358)
• fa4fe9e rt: fix queue regression (#2362)
• f01136b chore: prepare tokio v0.2.14 release (#2356)
• caa7e18 rt: cap fifo scheduler slot to avoid starvation (#2349)
• 7b2438e sync: fix notified link (#2351)
• 00725f6 sync: fix possible dangling pointer in semaphore (#2340)
• 5c71268 sync: broadcast, revert "Keep lock until sender notified" (#2348)
• 8020b02 fs: add coop test (#2344)
• 11acfbb rt: add task join coop test (#2345)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #37.