Python signal.setitimer方法代码示例

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def sample(self, signum, frame):  #pylint: disable=unused-argument
        """Samples current stack and writes result in self._stats.

        Args:
            signum: Signal that activates handler.
            frame: Frame on top of the stack when signal is handled.
        """
        stack = []
        while frame and frame != self.base_frame:
            stack.append((
                frame.f_code.co_name,
                frame.f_code.co_filename,
                frame.f_code.co_firstlineno))
            frame = frame.f_back
        self._stats[tuple(stack)] += 1
        signal.setitimer(signal.ITIMER_PROF, _SAMPLE_INTERVAL) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def sig_vtalrm(self, *args):
        self.hndl_called = True

        if self.hndl_count > 3:
            # it shouldn't be here, because it should have been disabled.
            raise signal.ItimerError("setitimer didn't disable ITIMER_VIRTUAL "
                "timer.")
        elif self.hndl_count == 3:
            # disable ITIMER_VIRTUAL, this function shouldn't be called anymore
            signal.setitimer(signal.ITIMER_VIRTUAL, 0)
            if test_support.verbose:
                print("last SIGVTALRM handler call")

        self.hndl_count += 1

        if test_support.verbose:
            print("SIGVTALRM handler invoked", args) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def test_itimer_prof(self):
        self.itimer = signal.ITIMER_PROF
        signal.signal(signal.SIGPROF, self.sig_prof)
        signal.setitimer(self.itimer, 0.2, 0.2)

        start_time = time.time()
        while time.time() - start_time < 60.0:
            # do some work
            _ = pow(12345, 67890, 10000019)
            if signal.getitimer(self.itimer) == (0.0, 0.0):
                break # sig_prof handler stopped this itimer
        else: # Issue 8424
            self.skipTest("timeout: likely cause: machine too slow or load too "
                          "high")

        # profiling itimer should be (0.0, 0.0) now
        self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))
        # and the handler should have been called
        self.assertEqual(self.hndl_called, True) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def run(self, profiler):
        weak_profiler = weakref.proxy(profiler)
        handle = functools.partial(self.handle_signal, weak_profiler)
        t = self.interval
        with deferral() as defer:
            prev_handle = signal.signal(signal.SIGPROF, handle)
            if prev_handle == signal.SIG_DFL:
                # sometimes the process receives SIGPROF although the sampler
                # unsets the itimer.  If the previous handler was SIG_DFL, the
                # process will crash when received SIGPROF.  To prevent this
                # risk, it makes the process to ignore SIGPROF when it isn't
                # running if the previous handler was SIG_DFL.
                prev_handle = signal.SIG_IGN
            defer(signal.signal, signal.SIGPROF, prev_handle)
            prev_itimer = signal.setitimer(signal.ITIMER_PROF, t, t)
            defer(signal.setitimer, signal.ITIMER_PROF, *prev_itimer)
            yield 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def test_itimer_virtual(self):
        self.itimer = signal.ITIMER_VIRTUAL
        signal.signal(signal.SIGVTALRM, self.sig_vtalrm)
        signal.setitimer(self.itimer, 0.3, 0.2)

        start_time = time.monotonic()
        while time.monotonic() - start_time < 60.0:
            # use up some virtual time by doing real work
            _ = pow(12345, 67890, 10000019)
            if signal.getitimer(self.itimer) == (0.0, 0.0):
                break # sig_vtalrm handler stopped this itimer
        else: # Issue 8424
            self.skipTest("timeout: likely cause: machine too slow or load too "
                          "high")

        # virtual itimer should be (0.0, 0.0) now
        self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))
        # and the handler should have been called
        self.assertEqual(self.hndl_called, True)

    # Issue 3864, unknown if this affects earlier versions of freebsd also 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def test_itimer_prof(self):
        self.itimer = signal.ITIMER_PROF
        signal.signal(signal.SIGPROF, self.sig_prof)
        signal.setitimer(self.itimer, 0.2, 0.2)

        start_time = time.monotonic()
        while time.monotonic() - start_time < 60.0:
            # do some work
            _ = pow(12345, 67890, 10000019)
            if signal.getitimer(self.itimer) == (0.0, 0.0):
                break # sig_prof handler stopped this itimer
        else: # Issue 8424
            self.skipTest("timeout: likely cause: machine too slow or load too "
                          "high")

        # profiling itimer should be (0.0, 0.0) now
        self.assertEqual(signal.getitimer(self.itimer), (0.0, 0.0))
        # and the handler should have been called
        self.assertEqual(self.hndl_called, True) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def start(self):
        self.last_profile_time = timer()

        if self.use_signal:
            try:
                signal.signal(signal.SIGALRM, self._signal)
                # the following tells the system to restart interrupted system calls if they are
                # interrupted before any data has been transferred. This avoids many of the problems
                # related to signals interrupting system calls, see issue #16
                signal.siginterrupt(signal.SIGALRM, False)
            except ValueError:
                raise NotMainThreadError()

            signal.setitimer(signal.ITIMER_REAL, self.interval, 0.0)
        else:
            sys.setprofile(self._profile) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def set_blocking_signal_threshold(self, seconds, action):
        """Sends a signal if the ioloop is blocked for more than s seconds.

        Pass seconds=None to disable.  Requires python 2.6 on a unixy
        platform.

        The action parameter is a python signal handler.  Read the
        documentation for the python 'signal' module for more information.
        If action is None, the process will be killed if it is blocked for
        too long.
        """
        if not hasattr(signal, "setitimer"):
            #logging.error("set_blocking_signal_threshold requires a signal module "
            #           "with the setitimer method")
            ht.logger.error("set_blocking_signal_threshold requires a signal module "
                       "with the setitimer method")
            return
        self._blocking_signal_threshold = seconds
        if seconds is not None:
            signal.signal(signal.SIGALRM,
                          action if action is not None else signal.SIG_DFL) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def set_blocking_signal_threshold(self, seconds, action):
        if not hasattr(signal, "setitimer"):
            gen_log.error("set_blocking_signal_threshold requires a signal module "
                          "with the setitimer method")
            return
        self._blocking_signal_threshold = seconds
        if seconds is not None:
            signal.signal(signal.SIGALRM,
                          action if action is not None else signal.SIG_DFL) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def __enter__(self):
        """Enables statistical profiler."""
        signal.signal(signal.SIGPROF, self.sample)
        signal.setitimer(signal.ITIMER_PROF, _SAMPLE_INTERVAL)
        self._start_time = time.time()
        return self 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def __exit__(self, exc_type, exc_val, exc_tbf):
        """Disables statistical profiler."""
        self.run_time = time.time() - self._start_time
        signal.setitimer(signal.ITIMER_PROF, 0) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def __call__(self, *args):
        # get the old SIGALRM handler
        old = signal.signal(signal.SIGALRM, self.handler)
        # set the alarm
        signal.setitimer(signal.ITIMER_REAL, self.timeout)
        try:
            result = self.function(*args)
        finally:
            # restore existing SIGALRM handler
            signal.signal(signal.SIGALRM, old)
        signal.setitimer(signal.ITIMER_REAL, 0)
        return result 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def tearDown(self):
        signal.signal(signal.SIGALRM, self.old_alarm)
        if self.itimer is not None: # test_itimer_exc doesn't change this attr
            # just ensure that itimer is stopped
            signal.setitimer(self.itimer, 0) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def sig_prof(self, *args):
        self.hndl_called = True
        signal.setitimer(signal.ITIMER_PROF, 0)

        if test_support.verbose:
            print("SIGPROF handler invoked", args) 

# 需要导入模块: import signal [as 别名]
# 或者: from signal import setitimer [as 别名]
def test_itimer_exc(self):
        # XXX I'm assuming -1 is an invalid itimer, but maybe some platform
        # defines it ?
        self.assertRaises(signal.ItimerError, signal.setitimer, -1, 0)
        # Negative times are treated as zero on some platforms.
        if 0:
            self.assertRaises(signal.ItimerError,
                              signal.setitimer, signal.ITIMER_REAL, -1)