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doc: clarify async execute callback usage #21217

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doc: clarify async execute callback usage #21217

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doc: clarify async execute callback usage
mhdawson Jun 8, 2018
158c729
squash: address comments.
mhdawson Jun 13, 2018
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14 changes: 13 additions & 1 deletion doc/api/n-api.md
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Expand Up @@ -179,6 +179,11 @@ operations. Callback functions must statisfy the following signature:
typedef void (*napi_async_execute_callback)(napi_env env, void* data);
```

Implementations of this type of function should avoid making any N-API calls
that could result in the execution of JavaScript or interaction with
JavaScript objects. Most often, any code that needs to make N-API
calls should be made in `napi_async_complete_callback` instead.

#### napi_async_complete_callback
Function pointer used with functions that support asynchronous
operations. Callback functions must statisfy the following signature:
Expand Down Expand Up @@ -3322,7 +3327,14 @@ asynchronous workers. Instances are created/deleted with

The `execute` and `complete` callbacks are functions that will be
invoked when the executor is ready to execute and when it completes its
task respectively. These functions implement the following interfaces:
task respectively.

The `execute` function should avoid making any N-API calls
that could result in the execution of JavaScript or interaction with
JavaScript objects. Most often, any code that needs to make N-API
calls should be made in `complete` callback instead.

These functions implement the following interfaces:

```C
typedef void (*napi_async_execute_callback)(napi_env env,
Expand Down