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bpo-41247: asyncio.set_running_loop() cache running loop holder (GH-21401) 

The running loop holder cache variable was always set to NULL when
calling set_running_loop.

Now set_running_loop saves the newly created running loop holder in the
cache variable for faster access in get_running_loop.

Automerge-Triggered-By: @1st1
(cherry picked from commit 529f42645d)

Co-authored-by: Tony Solomonik <tony.solomonik@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-07-08 12:47:20 -07:00 committed by GitHub
parent a0a6f11678
commit fbd71f6684
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 3 deletions
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2
Misc/NEWS.d/next/Core and Builtins/2020-07-08-22-03-54.bpo-41247.PndYIk.rst Normal file
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@ -0,0 +1,2 @@
Always cache the running loop holder when running
``asyncio.set_running_loop``.

12
Modules/_asynciomodule.c
View File

@ -291,10 +291,13 @@ error:
static int
set_running_loop(PyObject *loop)
{
cached_running_holder = NULL;
cached_running_holder_tsid = 0;
PyObject *ts_dict = NULL;
PyThreadState *tstate = PyThreadState_Get();
if (tstate != NULL) {
ts_dict = _PyThreadState_GetDict(tstate); // borrowed
}
PyObject *ts_dict = PyThreadState_GetDict(); // borrowed
if (ts_dict == NULL) {
PyErr_SetString(
PyExc_RuntimeError, "thread-local storage is not available");
@ -314,6 +317,9 @@ set_running_loop(PyObject *loop)
}
Py_DECREF(rl);
cached_running_holder = (PyObject *)rl;
cached_running_holder_tsid = PyThreadState_GetID(tstate);
return 0;
}