| Optimize pending calls in multithreaded applications. If a thread different | |
| than the main thread schedules a pending call (:c:func:`Py_AddPendingCall`), | |
| the bytecode evaluation loop is no longer interrupted at each bytecode | |
| instruction to check for pending calls which cannot be executed. Only the | |
| main thread can execute pending calls. | |
| Previously, the bytecode evaluation loop was interrupted at each instruction | |
| until the main thread executes pending calls. |