Issue #11382: Trivial system calls, such as dup() or pipe(), needn't

release the GIL.  Patch by Charles-François Natali.

Misc/NEWS

@@ -113,6 +113,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #11382: Trivial system calls, such as dup() or pipe(), needn't
+  release the GIL.  Patch by Charles-François Natali.
+
 - Issue #11223: Add threading._info() function providing informations about
   the thread implementation.
 

Modules/posixmodule.c

@@ -3083,9 +3083,7 @@ posix_getpriority(PyObject *self, PyObject *args)
     if (!PyArg_ParseTuple(args, "ii", &which, &who))
         return NULL;
     errno = 0;
-    Py_BEGIN_ALLOW_THREADS
     retval = getpriority(which, who);
-    Py_END_ALLOW_THREADS
     if (errno != 0)
         return posix_error();
     return PyLong_FromLong((long)retval);
@@ -3105,9 +3103,7 @@ posix_setpriority(PyObject *self, PyObject *args)
 
     if (!PyArg_ParseTuple(args, "iii", &which, &who, &prio))
         return NULL;
-    Py_BEGIN_ALLOW_THREADS
     retval = setpriority(which, who, prio);
-    Py_END_ALLOW_THREADS
     if (retval == -1)
         return posix_error();
     Py_RETURN_NONE;
@@ -6010,9 +6006,7 @@ posix_dup(PyObject *self, PyObject *args)
         return NULL;
     if (!_PyVerify_fd(fd))
         return posix_error();
-    Py_BEGIN_ALLOW_THREADS
     fd = dup(fd);
-    Py_END_ALLOW_THREADS
     if (fd < 0)
         return posix_error();
     return PyLong_FromLong((long)fd);
@@ -6031,9 +6025,7 @@ posix_dup2(PyObject *self, PyObject *args)
         return NULL;
     if (!_PyVerify_fd_dup2(fd, fd2))
         return posix_error();
-    Py_BEGIN_ALLOW_THREADS
     res = dup2(fd, fd2);
-    Py_END_ALLOW_THREADS
     if (res < 0)
         return posix_error();
     Py_INCREF(Py_None);
@@ -6525,9 +6517,7 @@ posix_pipe(PyObject *self, PyObject *noargs)
     HFILE read, write;
     APIRET rc;
 
-    Py_BEGIN_ALLOW_THREADS
     rc = DosCreatePipe( &read, &write, 4096);
-    Py_END_ALLOW_THREADS
     if (rc != NO_ERROR)
         return os2_error(rc);
 
@@ -6536,9 +6526,7 @@ posix_pipe(PyObject *self, PyObject *noargs)
 #if !defined(MS_WINDOWS)
     int fds[2];
     int res;
-    Py_BEGIN_ALLOW_THREADS
     res = pipe(fds);
-    Py_END_ALLOW_THREADS
     if (res != 0)
         return posix_error();
     return Py_BuildValue("(ii)", fds[0], fds[1]);
@@ -6546,9 +6534,7 @@ posix_pipe(PyObject *self, PyObject *noargs)
     HANDLE read, write;
     int read_fd, write_fd;
     BOOL ok;
-    Py_BEGIN_ALLOW_THREADS
     ok = CreatePipe(&read, &write, NULL, 0);
-    Py_END_ALLOW_THREADS
     if (!ok)
         return win32_error("CreatePipe", NULL);
     read_fd = _open_osfhandle((Py_intptr_t)read, 0);