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files >> //opt/alt/alt-nodejs16/root/usr/lib/node_modules/npm/node_modules/asap/raw.js
"use strict"; var domain; // The domain module is executed on demand var hasSetImmediate = typeof setImmediate === "function"; // Use the fastest means possible to execute a task in its own turn, with // priority over other events including network IO events in Node.js. // // An exception thrown by a task will permanently interrupt the processing of // subsequent tasks. The higher level `asap` function ensures that if an // exception is thrown by a task, that the task queue will continue flushing as // soon as possible, but if you use `rawAsap` directly, you are responsible to // either ensure that no exceptions are thrown from your task, or to manually // call `rawAsap.requestFlush` if an exception is thrown. module.exports = rawAsap; function rawAsap(task) { if (!queue.length) { requestFlush(); flushing = true; } // Avoids a function call queue[queue.length] = task; } var queue = []; // Once a flush has been requested, no further calls to `requestFlush` are // necessary until the next `flush` completes. var flushing = false; // The position of the next task to execute in the task queue. This is // preserved between calls to `flush` so that it can be resumed if // a task throws an exception. var index = 0; // If a task schedules additional tasks recursively, the task queue can grow // unbounded. To prevent memory excaustion, the task queue will periodically // truncate already-completed tasks. var capacity = 1024; // The flush function processes all tasks that have been scheduled with // `rawAsap` unless and until one of those tasks throws an exception. // If a task throws an exception, `flush` ensures that its state will remain // consistent and will resume where it left off when called again. // However, `flush` does not make any arrangements to be called again if an // exception is thrown. function flush() { while (index < queue.length) { var currentIndex = index; // Advance the index before calling the task. This ensures that we will // begin flushing on the next task the task throws an error. index = index + 1; queue[currentIndex].call(); // Prevent leaking memory for long chains of recursive calls to `asap`. // If we call `asap` within tasks scheduled by `asap`, the queue will // grow, but to avoid an O(n) walk for every task we execute, we don't // shift tasks off the queue after they have been executed. // Instead, we periodically shift 1024 tasks off the queue. if (index > capacity) { // Manually shift all values starting at the index back to the // beginning of the queue. for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) { queue[scan] = queue[scan + index]; } queue.length -= index; index = 0; } } queue.length = 0; index = 0; flushing = false; } rawAsap.requestFlush = requestFlush; function requestFlush() { // Ensure flushing is not bound to any domain. // It is not sufficient to exit the domain, because domains exist on a stack. // To execute code outside of any domain, the following dance is necessary. var parentDomain = process.domain; if (parentDomain) { if (!domain) { // Lazy execute the domain module. // Only employed if the user elects to use domains. domain = require("domain"); } domain.active = process.domain = null; } // `setImmediate` is slower that `process.nextTick`, but `process.nextTick` // cannot handle recursion. // `requestFlush` will only be called recursively from `asap.js`, to resume // flushing after an error is thrown into a domain. // Conveniently, `setImmediate` was introduced in the same version // `process.nextTick` started throwing recursion errors. if (flushing && hasSetImmediate) { setImmediate(flush); } else { process.nextTick(flush); } if (parentDomain) { domain.active = process.domain = parentDomain; } }
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