Which APIs will be blocked when throtting occurs

For this article(Mali GPU: An Abstract Machine - Frame Pipelining - Graphics and Gaming blog - Graphics and Gaming - Arm Community), I have a question.

blocking inside an EGL or OpenGL ES API function until the display consumes a pending buffer

The throttling mentioned in this article will block EGL or ES API calls when throttling occurs. What are the specific APIs that will be blocked? Only eglSwapBuffers? Will other glDraw be blocked? Others?

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