swiftwasm/swift

Thread and RunLoopMode.common in not available on WASM

Kyle-Ye opened this issue · 1 comments

Kyle-Ye commented

Encounter some Thread related WASM error recently.

import Foundation

// Works on Ubuntu and macOS
@inline(__always)
func performOnMainThread(_ block: @escaping () -> Void) {
    if Thread.isMainThread {
        block()
    } else {
        RunLoop.main.perform(inModes: [.common], block: block)
    }
}
ThreadUtils.swift:15:41: error: reference to member 'common' cannot be resolved without a contextual type
        RunLoop.main.perform(inModes: [.common], block: block)
                                        ^
ThreadUtils.swift:12:8: error: cannot find 'Thread' in scope
    if Thread.isMainThread {

Is this an expected behavior and #5548 already keeps track of the issue?

kateinoigakukun commented

This is expected since we don't enable any RunLoop feature at this moment. Might be unblocked after porting libdispatch with threading support.

  • 👍2