manager.py 文件源码

def handle_sigchld(self, number, frame):
        """Apparently we need a sigchld handler to make set_wakeup_fd work."""
        # Write to the signal pipe (only for Python <2.5, where the
        # set_wakeup_fd method doesn't exist).
        if self.iomap.wakeup_writefd:
            os.write(self.iomap.wakeup_writefd, '\0')
        for task in self.running:
            if task.proc:
                task.proc.poll()
        # Apparently some UNIX systems automatically reset the SIGCHLD
        # handler to SIG_DFL.  Reset it just in case.
        self.set_sigchld_handler()