fixes gh-96078: os.sched_yield release the GIL while calling sched_yi…

…eld(2). (gh-97965) (cherry picked from commit b9d2e81) Co-authored-by: Dong-hee Na <donghee.na@python.org>
python · miss-islington · Oct 7, 2022 · Oct 6, 2022 · Oct 7, 2022 · 920e025c8b515527d16eba3ffd0568bacfe7212e
commit 920e025c8b515527d16eba3ffd0568bacfe7212e
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-10-06-15-45-57.gh-issue-96078.fS-6mU.rst b/Misc/NEWS.d/next/Core and Builtins/2022-10-06-15-45-57.gh-issue-96078.fS-6mU.rst
@@ -0,0 +1,2 @@
+:func:`os.sched_yield` now release the GIL while calling sched_yield(2).
+Patch by Dong-hee Na.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
@@ -7096,8 +7096,13 @@ static PyObject *
 os_sched_yield_impl(PyObject *module)
 /*[clinic end generated code: output=902323500f222cac input=e54d6f98189391d4]*/
 {
-    if (sched_yield())
+    int result;
+    Py_BEGIN_ALLOW_THREADS
+    result = sched_yield();
+    Py_END_ALLOW_THREADS
+    if (result < 0) {
        return posix_error();
+    }
    Py_RETURN_NONE;
 }
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		:func:`os.sched_yield` now release the GIL while calling sched_yield(2).
		Patch by Dong-hee Na.