Use threadpool for reading from file in sendfile fallback mode (#14076)

asvetlov · web-flow · commit 0237265e8287 · 2019-06-15T14:05:35.000+03:00
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
@@ -1141,7 +1141,7 @@ async def _sendfile_fallback(self, transp, file, offset, count):
                     if blocksize <= 0:
                         return total_sent
                 view = memoryview(buf)[:blocksize]
-                read = file.readinto(view)
+                read = await self.run_in_executor(None, file.readinto, view)
                 if not read:
                     return total_sent  # EOF
                 await proto.drain()
diff --git a/Misc/NEWS.d/next/Library/2019-06-14-13-30-47.bpo-37280.Fxur0F.rst b/Misc/NEWS.d/next/Library/2019-06-14-13-30-47.bpo-37280.Fxur0F.rst
@@ -0,0 +1 @@
+Use threadpool for reading from file for sendfile fallback mode.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+Use threadpool for reading from file for sendfile fallback mode.`