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author8cy <[email protected]>2020-04-03 02:48:28 -0700
committer8cy <[email protected]>2020-04-03 02:48:28 -0700
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parent2020/04/03, 02:42, V1.2.1 (diff)
downloads5nical-f9159ea2d994e14180fb02ab562f0119513e67cf.tar.xz
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2020/04/03, 02:47, V1.2.2
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-# Asynchronous operations
-
-Node.js native add-ons often need to execute long running tasks and to avoid
-blocking the **event loop** they have to run them asynchronously from the
-**event loop**.
-In the Node.js model of execution the event loop thread represents the thread
-where JavaScript code is executing. The Node.js guidance is to avoid blocking
-other work queued on the event loop thread. Therefore, we need to do this work on
-another thread.
-
-All this means that native add-ons need to leverage async helpers from libuv as
-part of their implementation. This allows them to schedule work to be executed
-asynchronously so that their methods can return in advance of the work being
-completed.
-
-Node Addon API provides an interface to support functions that cover
-the most common asynchronous use cases. There is an abstract classes to implement
-asynchronous operations:
-
-- **[`Napi::AsyncWorker`](async_worker.md)**
-
-These class helps manage asynchronous operations through an abstraction
-of the concept of moving data between the **event loop** and **worker threads**.
-
-Also, the above class may not be appropriate for every scenario. When using any
-other asynchronous mechanism, the following API is necessary to ensure an
-asynchronous operation is properly tracked by the runtime:
-
-- **[AsyncContext](async_context.md)**
-
-- **[CallbackScope](callback_scope.md)**