[Python-checkins] bpo-40533: Disable GC in subinterpreters (GH-19961)
Victor Stinner
webhook-mailer at python.org
Wed May 6 12:25:11 EDT 2020
https://github.com/python/cpython/commit/d8135e913ab7c694db247c86d0a84c450c32d86e
commit: d8135e913ab7c694db247c86d0a84c450c32d86e
branch: master
author: Victor Stinner <vstinner at python.org>
committer: GitHub <noreply at github.com>
date: 2020-05-06T18:25:06+02:00
summary:
bpo-40533: Disable GC in subinterpreters (GH-19961)
When Python is built with experimental isolated interpreters, a
garbage collection now does nothing in an isolated interpreter.
Temporary workaround until subinterpreters stop sharing Python
objects.
files:
M Modules/gcmodule.c
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index 56dcb101e0005..a44752b1cc4da 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -1181,6 +1181,14 @@ collect(PyThreadState *tstate, int generation,
_PyTime_t t1 = 0; /* initialize to prevent a compiler warning */
GCState *gcstate = &tstate->interp->gc;
+#ifdef EXPERIMENTAL_ISOLATED_SUBINTERPRETERS
+ if (tstate->interp->config._isolated_interpreter) {
+ // bpo-40533: The garbage collector must not be run on parallel on
+ // Python objects shared by multiple interpreters.
+ return 0;
+ }
+#endif
+
if (gcstate->debug & DEBUG_STATS) {
PySys_WriteStderr("gc: collecting generation %d...\n", generation);
show_stats_each_generations(gcstate);
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