fatsify核心功能示例测试!!!

node_modules/thread-stream/lib/wait.js

@@ -0,0 +1,61 @@
+'use strict'
+
+const MAX_TIMEOUT = 1000
+
+function wait (state, index, expected, timeout, done) {
+  const max = Date.now() + timeout
+  let current = Atomics.load(state, index)
+  if (current === expected) {
+    done(null, 'ok')
+    return
+  }
+  let prior = current
+  const check = (backoff) => {
+    if (Date.now() > max) {
+      done(null, 'timed-out')
+    } else {
+      setTimeout(() => {
+        prior = current
+        current = Atomics.load(state, index)
+        if (current === prior) {
+          check(backoff >= MAX_TIMEOUT ? MAX_TIMEOUT : backoff * 2)
+        } else {
+          if (current === expected) done(null, 'ok')
+          else done(null, 'not-equal')
+        }
+      }, backoff)
+    }
+  }
+  check(1)
+}
+
+// let waitDiffCount = 0
+function waitDiff (state, index, expected, timeout, done) {
+  // const id = waitDiffCount++
+  // process._rawDebug(`>>> waitDiff ${id}`)
+  const max = Date.now() + timeout
+  let current = Atomics.load(state, index)
+  if (current !== expected) {
+    done(null, 'ok')
+    return
+  }
+  const check = (backoff) => {
+    // process._rawDebug(`${id} ${index} current ${current} expected ${expected}`)
+    // process._rawDebug('' + backoff)
+    if (Date.now() > max) {
+      done(null, 'timed-out')
+    } else {
+      setTimeout(() => {
+        current = Atomics.load(state, index)
+        if (current !== expected) {
+          done(null, 'ok')
+        } else {
+          check(backoff >= MAX_TIMEOUT ? MAX_TIMEOUT : backoff * 2)
+        }
+      }, backoff)
+    }
+  }
+  check(1)
+}
+
+module.exports = { wait, waitDiff }