docs/examples/userguide/parallelism/breaking_loop.pyx


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from cython.parallel import prange

cdef int func(Py_ssize_t n) except -1:
    cdef Py_ssize_t i

    for i in prange(n, nogil=True):
        if i == 8:
            with gil:
                raise Exception()
        elif i == 4:
            break
        elif i == 2:
            return i