gh-100227: Lock Around Modification of the Global Allocators State (gh-105516)

The risk of a race with this state is relatively low, but we play it safe anyway. We do avoid using the lock in performance-sensitive cases where the risk of a race is very, very low.

1 files changed, 1 insertions, 0 deletions

diff --git a/Include/internal/pycore_pymem.h b/Include/internal/pycore_pymem.h
index a555f37..81a707a 100644
--- a/Include/internal/pycore_pymem.h
+++ b/Include/internal/pycore_pymem.h
@@ -18,6 +18,7 @@ typedef struct {
 } debug_alloc_api_t;
 
 struct _pymem_allocators {
+    PyThread_type_lock mutex;
     struct {
         PyMemAllocatorEx raw;
         PyMemAllocatorEx mem;