Python signal example windows

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Next Python Stack. Pankaj I love Open Source technologies and writing about my experience about them is my passion. Follow Author. Comments Nagireddy says:. September 3, at pm. Leave a Reply Cancel reply Your email address will not be published. Leave this field empty. Exact matches only. Python signal. Project: svviz Author: svviz File: multiprocessor. Project: cherrypy Author: cherrypy File: plugins. Project: wio-cli Author: Seeed-Studio File: wio. Project: sanic Author: huge-success File: compat.

Frequent wakeups keep interrupts flowing. Project: jawfish Author: war-and-code File: signals. TestResult unittest. Project: dataflow Author: tensorpack File: concurrency. Install python-prctl so that processes can be cleaned with guarantee. Note that you need to install 'python-prctl' instead of 'prctl'.

The target thread can be executing any code Python or not. However, if the target thread is executing the Python interpreter, the Python signal handlers will be executed by the main thread of the main interpreter.

Therefore, the only point of sending a signal to a particular Python thread would be to force a running system call to fail with InterruptedError. Use threading. If signalnum is 0, then no signal is sent, but error checking is still performed; this can be used to check if the target thread is still running.

Raises an auditing event signal. See also os. The signal mask is the set of signals whose delivery is currently blocked for the caller. Return the old signal mask as a set of signals. It is permissible to attempt to unblock a signal which is not blocked. For example, signal. See also pause , sigpending and sigwait. Sets given interval timer one of signal. The interval timer specified by which can be cleared by setting seconds to zero. When an interval timer fires, a signal is sent to the process.

The signal sent is dependent on the timer being used; signal. Attempting to pass an invalid interval timer will cause an ItimerError. Set the wakeup file descriptor to fd. When a signal is received, the signal number is written as a single byte into the fd. This can be used by a library to wakeup a poll or select call, allowing the signal to be fully processed. The old wakeup fd is returned or -1 if file descriptor wakeup was not enabled.

If fd is -1, file descriptor wakeup is disabled. If not -1, fd must be non-blocking. It is up to the library to remove any bytes from fd before calling poll or select again. When threads are enabled, this function can only be called from the main thread of the main interpreter ; attempting to call it from other threads will cause a ValueError exception to be raised. There are two common ways to use this function.

In both approaches, you use the fd to wake up when a signal arrives, but then they differ in how they determine which signal or signals have arrived.

This is simple, but in rare cases it can run into a problem: generally the fd will have a limited amount of buffer space, and if too many signals arrive too quickly, then the buffer may become full, and some signals may be lost. In the second approach, we use the wakeup fd only for wakeups, and ignore the actual byte values.

Change system call restart behaviour: if flag is False , system calls will be restarted when interrupted by signal signalnum , otherwise system calls will be interrupted.

See the man page siginterrupt 3 for further information. Note that installing a signal handler with signal will reset the restart behaviour to interruptible by implicitly calling siginterrupt with a true flag value for the given signal.

Set the handler for signal signalnum to the function handler. The previous signal handler will be returned see the description of getsignal above.

See the Unix man page signal 2 for further information. The handler is called with two arguments: the signal number and the current stack frame None or a frame object; for a description of frame objects, see the description in the type hierarchy or see the attribute descriptions in the inspect module. A ValueError will be raised in any other case.

Examine the set of signals that are pending for delivery to the calling thread i. Return the set of the pending signals. See the man page sigpending 2 for further information.