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Anthropic Tokio Fork

This is Anthropic's fork of tokio, published to our internal Artifactory registry as crates-internal.

Version Convention

Versions follow the +anthropic.N suffix convention per go/fork:

  • 1.49.0+anthropic.1 = tokio 1.49.0 + stall detection feature

Features Added

stall-detection

Detects when a tokio worker thread is stalled (blocked in a task poll for too long) and reports diagnostics including stack traces via tracing.

let rt = tokio::runtime::Builder::new_multi_thread()
    .enable_stall_detection()
    .stall_detection_poll_interval(Duration::from_millis(100))
    .stall_detection_escalation_threshold(Duration::from_secs(10))
    .build()
    .unwrap();

Publishing

Publishing happens automatically when changes are pushed to the anthropic-1.49.0 branch. The GitHub Actions workflow uses OIDC authentication with Artifactory.

Prerequisites

  1. The anthropics/tokio repo must be added to the OIDC config in anthropics/terraform-config
  2. A publish-cli GitHub environment must be configured in repo settings
  3. The jfrog/setup-jfrog-cli action must be allowed in repo settings

Using in the Monorepo

In the workspace Cargo.toml:

[patch.crates-io]
tokio = { version = "1.49.0+anthropic.1", registry = "crates-internal" }