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62 lines
1.5 KiB
62 lines
1.5 KiB
'use strict'
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const MAX_TIMEOUT = 1000
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function wait (state, index, expected, timeout, done) {
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const max = Date.now() + timeout
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let current = Atomics.load(state, index)
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if (current === expected) {
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done(null, 'ok')
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return
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}
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let prior = current
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const check = (backoff) => {
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if (Date.now() > max) {
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done(null, 'timed-out')
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} else {
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setTimeout(() => {
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prior = current
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current = Atomics.load(state, index)
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if (current === prior) {
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check(backoff >= MAX_TIMEOUT ? MAX_TIMEOUT : backoff * 2)
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} else {
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if (current === expected) done(null, 'ok')
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else done(null, 'not-equal')
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}
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}, backoff)
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}
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}
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check(1)
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}
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// let waitDiffCount = 0
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function waitDiff (state, index, expected, timeout, done) {
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// const id = waitDiffCount++
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// process._rawDebug(`>>> waitDiff ${id}`)
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const max = Date.now() + timeout
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let current = Atomics.load(state, index)
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if (current !== expected) {
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done(null, 'ok')
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return
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}
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const check = (backoff) => {
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// process._rawDebug(`${id} ${index} current ${current} expected ${expected}`)
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// process._rawDebug('' + backoff)
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if (Date.now() > max) {
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done(null, 'timed-out')
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} else {
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setTimeout(() => {
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current = Atomics.load(state, index)
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if (current !== expected) {
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done(null, 'ok')
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} else {
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check(backoff >= MAX_TIMEOUT ? MAX_TIMEOUT : backoff * 2)
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}
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}, backoff)
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}
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}
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check(1)
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}
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module.exports = { wait, waitDiff }
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