[6.0] [stdlib] Implement Mutex in Synchronization #74183
Merged
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This is a cherry pick of #71383, #74143, #74258, and #74381
Explanation: This adds the new proposed and accepted
Mutex
type from: https://github.com/apple/swift-evolution/blob/main/proposals/0433-mutex.md to theSynchronization
module.Scope: Folks importing the new
Synchronization
module.Main Branch PR: #71383
Risk: Low to Medium; This adds a completely new type along with new build rules (they are hopefully non-controversial, just allows for platforms to customize their target sources) to the
Synchronization
module which hasn't shipped yet.Reviewed By: @al45tair and @glessard
Testing: New tests added to the test suite.