gh-130421: Fix data race on timebase initialization (gh-130592)

Windows and macOS require precomputing a "timebase" in order to convert
OS timestamps into nanoseconds. Retrieve and compute this value during
runtime initialization to avoid data races when accessing the time.

1 files changed, 6 insertions, 0 deletions

diff --git a/Python/pystate.c b/Python/pystate.c
index 09b83cdeb1f..9ebd9fdea60 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -20,6 +20,7 @@
 #include "pycore_pystate.h"
 #include "pycore_runtime_init.h"  // _PyRuntimeState_INIT
 #include "pycore_stackref.h"      // Py_STACKREF_DEBUG
+#include "pycore_time.h"          // _PyTime_Init()
 #include "pycore_obmalloc.h"      // _PyMem_obmalloc_state_on_heap()
 #include "pycore_uniqueid.h"      // _PyObject_FinalizePerThreadRefcounts()
 
@@ -461,6 +462,11 @@ _PyRuntimeState_Init(_PyRuntimeState *runtime)
         assert(!runtime->_initialized);
     }
 
+    PyStatus status = _PyTime_Init(&runtime->time);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
+    }
+
     if (gilstate_tss_init(runtime) != 0) {
         _PyRuntimeState_Fini(runtime);
         return _PyStatus_NO_MEMORY();