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Questions - signals

Ending a loop on time expiration

I have a long computation in a loop, which I need to end prematurely if allowed compute time expires (and return a partially computed result). I plan to do it via SIGALARM handler and a timer: // Alar...
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user2052436

c++

c++17

signals

atomic

race-condition

Votes: 0

Answers: 2

Latest Answer

If you aren't using multiple threads, you don't need an atomic operation. Just set the global variable expired = true in the signal handler. EDIT: as @Frank demonstrated below, the compiler might opti...
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user16978892

Why does subprocess stdout only produce one line when the process is killed with os.kill()?

I have a piece of code that opens a subprocess and writes the output to a file: logPath = '/path/to/some/directory/' log = open(logPath + 'log', 'a') guipid = subprocess.Popen(SomeGuiApplication, ...
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Daniel Klisiewicz

python

subprocess

signals

stdout

Votes: 0

Answers: 1

Latest Answer

I assume that the output of the process is buffered and since you kill it you don't give it a chance to flush its output to stdout. You could maybe try to change to bufsize parameter of Popen to 0, wh...
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Amit Sides

Hitting Task exception was never retrieved while executing a signal handler using asyncio in Python3.6

I have a Python3.6 application that uses bleak lib for BLE communication. I need to handle Ctrl-C signal by disconnecting BLE and do some clean up in case user decides to terminate the script while th...
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prime_mover

signals

python-3.6

python-asyncio

Votes: 0

Answers: 0

python signal.scipy.welch for complex input returns frequency indices which are not ordered negative to positive

My aim is to plot the PSD of a complex vector x. I calculated the spectrum estimation using scipy.welch (version 1.4.1): f, Px = scipy.signal.welch(**x**, return_onesided=False, detrend=False) and th...
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Idnv

python

scipy

signals

spectrum

Votes: 0

Answers: 1

Latest Answer

Think about angles a complex value moves between two samples, it can be from 0 to 360 (this is the order that welch will return), but another way to see for say 200 degrees is that it is a 360-200=160...
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Bob

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