在没有 GIL 的情况下不允许来自 Python 的强制，并行使用 arrays（Cython 中的多线程）

Question

void worker(int *P,int l):
  cdef i

  with nogil, parallel():
    for i in prange(l):
        P[i]=1

I'm trying to use arrays in cython with multithreading.. but i get this error:

Coercion from Python not allowed without the GIL

the array P is initialized like this:

cdef int l=500000

cdef int *P=<int *> malloc(l* sizeof(int))

any help?

Answer 1

If you don't specify a type (eg cdef i ) then i is a Python object. Therefore you are not allowed to use i within a nogil block. You probably want cdef int i or similar to specify that i is a C integer.