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Critical

Critical is a special way to call native functions without the overhead of the JVM/Android environment.

Supported when using:

  • Foreign Functions & Memory API
  • JVMCI
  • Android

To activate this acceleration, you need to add the [Critical] annotation to the function in the NDL file: 

namespace global {
    [Critical] void fastFunc();
}

The function must meet the following requirements:

  • Returns a primitive value only (arrays and strings are not permitted)
  • Accepts only string, primitive or primitive array arguments (callbacks and dictionaries are not allowed)
  • Must execute and return as quickly as possible

You can read more about how it works in the CriticalNative documentation for Android.