From 734a4af152de71594cd4f355d79ccdae3013ed6a Mon Sep 17 00:00:00 2001
From: Ma Lin <malincns@163.com>
Date: Sat, 2 Apr 2022 14:01:26 +0800
Subject: [PATCH] multiprocessing: micro-optimize Connection.send_bytes()
 method

When m.itemsize > 1, avoid copying memory.
---
 Lib/multiprocessing/connection.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index 1cca66d5661e34..65303d29f51f8f 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -188,10 +188,9 @@ def send_bytes(self, buf, offset=0, size=None):
         self._check_closed()
         self._check_writable()
         m = memoryview(buf)
-        # HACK for byte-indexing of non-bytewise buffers (e.g. array.array)
         if m.itemsize > 1:
-            m = memoryview(bytes(m))
-        n = len(m)
+            m = m.cast('B')
+        n = m.nbytes
         if offset < 0:
             raise ValueError("offset is negative")
         if n < offset: