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Interrupt and signal handling for Cython

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Cython and interrupts

When writing Cython code, special care must be taken to ensure that the code can be interrupted with CTRL-C. Since Cython optimizes for speed, Cython normally does not check for interrupts. For example, code like the following cannot be interrupted in Cython:

while True:

The cysignals package provides mechanisms to handle interrupts (and other signals and errors) in Cython code.


  • Python >= 3.6
  • Cython >= 0.28
  • Sphinx >= 1.6 (for building the documentation)
  • PARI/GP (optional; for interfacing with the PARI/GP signal handler)


1.11.2 (2021-12-15)

  • Drop assembly code added after 1.10.3 that is not portable.

1.11.0 (2021-11-26)

  • Drop Python 2 support; bump minimum Python version to 3.6. [#142]
  • Fixed compilation with glib 3.34. [#151]
  • Improved testing. [#139, #152, #154]

1.10.3 (2021-03-16)

  • Improved installation of cysignals with pip install -e. [#130]
  • Fixed compilation of OpenMP modules that also use cysignals. [#128]
  • Fixed segmentation fault that could occur when sig_occurred() is called recursively during garbage collection. [#127]
  • Improved error reporting of signals that occurred inside sig_on() as opposed to outside them.
  • Fixed bug in the cysignals_example package. [#113]

For changes in previous releases, see the best source available is to compare git tags:

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