是否可以在nogil部分中使用Cython扩展类型?

问题描述 投票:0回答:1

我创建了Cython扩展类型,我想在nogil上下文中使用它。但是编译器总是抛出错误。这是我要执行的操作的一个简单示例:

  1 # cython: language_level=3
  2 
  3 from cython.parallel import prange
  4 
  5 cdef class C1:
  6 
  7     cdef public:
  8         int val
  9 
 10     def __cinit__(self, value):
 11         self.val = value
 12 
 13 def iterate_C1():
 14 
 15     cdef int i
 16     cdef int N = 4
 17     cdef C1 c1_i
 18 
 19     # This compiles fine
 20     c1 = C1(4)
 21     print(f'c1.val={c1.val}')
 22 
 23     # But this doesn't
 24     with nogil:
 25         for i in prange(N):
 26             c1_i = C1(i)

我有很多例外,但它们都看起来像这样:

Compiling c_one.pyx because it changed.
[1/1] Cythonizing c_one.pyx

Error compiling Cython file:
------------------------------------------------------------
...
    print(f'c1.val={c1.val}')

    # But this doesn't
    with nogil:
        for i in prange(N):
            c1_i = C1(i)
           ^
------------------------------------------------------------

c_one.pyx:26:12: Assignment of Python object not allowed without gil

Error compiling Cython file:
------------------------------------------------------------
...
    print(f'c1.val={c1.val}')

    # But this doesn't
    with nogil:
        for i in prange(N):
            c1_i = C1(i)
                    ^
------------------------------------------------------------

c_one.pyx:26:21: Calling gil-requiring function not allowed without gil

所以在nogil上下文中无法使用Cython扩展类型?

python cython
1个回答
1
投票

您绝对不能在cdef块内创建nogil扩展类型的实例。它们最终是Python对象,需要引用计数(包括在某些非显而易见的地方,例如类型对象),Python管理的内存分配以及ci之前内容的重新分配,包括调用其析构函数。 >

您应该能够访问其cdef members(例如,此类的val)并调用其标记为cdefnogil函数。

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