This patch is very simple. We didn't want to remove the is_tripped variable because PyErr_CheckSignals() is called several times directly so it would be nice if we could return immediately if no signals arrived. We also didn't want to run the registered handlers with any set of signals blocked. Thus, we thought of zeroing is_tripped as soon as we know there are signals to be handled (after we test is_tripped). This way most of the times we can return immediately because is_tripped is zero and we also don't need to block any signals. However, with this approach we can have a situation where is_tripped isn't zero but we have no signals to handle, so we'll loop through all signals and no registered handler will be called. This happens when we receive a signal after we zero is_tripped and before we check Handlers[i].tripped for that signal. Any comments?
File Added: signals-v0.patch