From adcb6a6055c7fe6e02621f66945be237b42e945a Mon Sep 17 00:00:00 2001
From: Michael Droettboom <mdboom@gmail.com>
Date: Thu, 5 May 2022 23:59:45 -0400
Subject: [PATCH] gh-92356: Fix regression in ctypes function call overhead
(#92357)
38f331d introduced a delayed initialization routine to set up
ctypes formattable (`_ctypes_init_fielddesc`), but inadvertently
removed setting the `initialization` flag to 1 to avoid initting
each time.
---
.../next/Library/2022-05-05-19-25-09.gh-issue-92356.uvxWdu.rst | 1 +
Modules/_ctypes/cfield.c | 1 +
2 files changed, 2 insertions(+)
create mode 100644 Misc/NEWS.d/next/Library/2022-05-05-19-25-09.gh-issue-92356.uvxWdu.rst
diff --git a/Misc/NEWS.d/next/Library/2022-05-05-19-25-09.gh-issue-92356.uvxWdu.rst b/Misc/NEWS.d/next/Library/2022-05-05-19-25-09.gh-issue-92356.uvxWdu.rst
new file mode 100644
index 00000000000..9c9566e5b9d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-05-05-19-25-09.gh-issue-92356.uvxWdu.rst
@@ -0,0 +1 @@
+Fixed a performance regression in ctypes function calls.
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index 23c11c98b2a..c7234fbb18a 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -1602,6 +1602,7 @@ _ctypes_get_fielddesc(const char *fmt)
struct fielddesc *table = formattable;
if (!initialized) {
+ initialized = 1;
_ctypes_init_fielddesc();
}
--
GitLab