The synchronization primitives from the threading module instead.īesides, only the main thread of the main interpreter is allowed to set a new signal handler. This means that signalsĬan’t be used as a means of inter-thread communication. Python signal handlers are always executed in the main Python thread of the main interpreter,Įven if the signal was received in another thread. If the handler raises an exception, it will be raised “out of thin air” in Signal handlers will be called when the calculation finishes.
Onwards, you can use the faulthandler module to report on synchronousĪ long-running calculation implemented purely in C (such as regularĮxpression matching on a large body of text) may run uninterrupted for anĪrbitrary amount of time, regardless of any signals received. The same signal again, causing Python to apparently hang. Will return from the signal handler to the C code, which is likely to raise SIGSEGV that are caused by an invalid operation in C code. It makes little sense to catch synchronous errors like SIGFPE or Virtual machine to execute the corresponding Python signal handlerĪt a later point(for example at the next bytecode instruction). Instead, the low-level signal handler sets a flag which tells the
Execution of Python signal handlers ¶Ī Python signal handler does not get executed inside the low-level (C) signal
Several functions and signalsĪre not available on these platforms. On WebAssembly platforms wasm32-emscripten and wasm32-wasi, signalsĪre emulated and therefore behave differently. SIGCHLD, which follows the underlying implementation. Underlying implementation), with the exception of the handler for Translated into a KeyboardInterrupt exception if the parent processĪ handler for a particular signal, once set, remains installed until it isĮxplicitly reset (Python emulates the BSD style interface regardless of the Installed: SIGPIPE is ignored (so write errors on pipes and socketsĬan be reported as ordinary Python exceptions) and SIGINT is The signal.signal() function allows defining custom handlers to beĮxecuted when a signal is received. This module provides mechanisms to use signal handlers in Python. Signal - Set handlers for asynchronous events ¶
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