| Optimize signal handling in multithreaded applications. If a thread different | |
| than the main thread gets a signal, the bytecode evaluation loop is no longer | |
| interrupted at each bytecode instruction to check for pending signals which | |
| cannot be handled. Only the main thread of the main interpreter can handle | |
| signals. | |
| Previously, the bytecode evaluation loop was interrupted at each instruction | |
| until the main thread handles signals. |