Question

我想包装一个动态链接的c库，所有cython模块都链接在一起。问题是我遇到了分段错误。我读到通过extern语句向cython公开的变量对于每个模块都不相同。例如，您无法在一个模块中操作int并在另一个模块中查看更改的int。我认为这是我的分段错误的原因。

这是我的真实世界的例子：

在https://bitbucket.org/stueker/jrtk/src/master/下获取jrtk回购。我链接到使用以下终端命令构建项目时创建的库：

GAC

我将以下文件放在回购邮件旁边的文件夹中。

setup.py ：

WMI

的CMakeLists.txt ：

mkdir build
cmake ..
make

itfMain.pyx ： from distutils.core import setup from Cython.Build import cythonize from distutils.extension import Extension import os import shutil import subprocess import sys def find_tcl(): build_path = "build" try: os.mkdir(build_path) except FileExistsError: print("build already exists") cmake_cache = "CMakeCache.txt" tcl_include = "TCL_INCLUDE_PATH" separator = ":PATH=" if sys.platform.startswith('win'): shell = True else: shell = False cmake_cmd = ["cmake", ".."] print("################### Calling CMAKE ###################") retCode = subprocess.check_call(cmake_cmd, cwd=build_path, stderr=subprocess.STDOUT, shell=shell) print("################### CMAKE returned ###################") text = open(os.path.join(build_path, cmake_cache)).read() start = text.find(tcl_include) include_path = text[start:text.find(os.linesep, start)] return include_path.replace(tcl_include, "").replace(separator, "").strip() jrtk_root = "/home/simon/janus/jrtk" def declare_cython_extensions(source_path): libs = ["janus"] lib_dirs = [jrtk_root + os.path.sep + "build"] postfix = "/include" base_dir = jrtk_root + os.path.sep + "source" (path, dirs, _) = next(os.walk(base_dir)) include_dirs = [os.path.join(path, d) + postfix for d in dirs] include_dirs.extend([base_dir, find_tcl()]) extension_list = [] for (path, folders, files) in os.walk(source_path): for f in files: if f.endswith(".pyx"): ext = Extension(f.replace(".pyx", ""), [os.path.join(path, f)], libraries=libs, library_dirs=lib_dirs, include_dirs=include_dirs, define_macros=[("DISABLE_TK", None), ("DISABLE_READLINE", None), # In TCL8.6 deprecated and needs this flag to activate ("USE_INTERP_ERRORLINE", None)] ) extension_list.append(ext) return extension_list extensions = declare_cython_extensions(".") ext_modules = cythonize(extensions) setup( name='Global setup', ext_modules=ext_modules )是结构，cmake_minimum_required( VERSION 3.5 ) project( JRTK_CYTHON ) set( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_LIST_DIR}/cmake ) set ( INCLUDE_DIRECTORIES "") find_package(TCL 8.5 REQUIRED) list(APPEND INCLUDE_DIRECTORIES "${TCL_INCLUDE_PATH}")是指向这种结构的全局指针。

Tcl_Interp

itf.pyx ：

interp

c_itfMain.pxd ：

from c_itfMain cimport Tcl_Interp, Itf_Lib_Init, interp, ClientData

cdef extern from "../jrtk/source/itf/include/itf/itf.h":
    ctypedef struct TypeInfo:
        pass

cdef extern from "../jrtk/source/itf/source/itf.c":
     cdef int itfCreate(ClientData clientData, Tcl_Interp *interp, int argc, char *argv[])


cdef extern from "../jrtk/source/models/source/tags.c":
    TypeInfo tagsInfo


def jrtk_Init():
    rv = Itf_Lib_Init(0, NULL)

def tagsTest():
    print("Hello")
    print(interp.errorLine)
    rv = itfCreate(&tagsInfo, interp, 2, ["Tags", "tagTest"])

我通过以下方式编译此cython代码：from c_itfMain cimport Itf_Lib_Init def jrtk_Init(): rv = Itf_Lib_Init(0, NULL)

test.py ：

cdef extern from "../jrtk/source/itf/source/itfMain.c":
    cdef int Itf_Lib_Init(int argc, char ** argv)
    cdef Tcl_Interp *interp

cdef extern from "../jrtk/source/itf/include/itf/itf.h":
    ctypedef void*ClientData

cdef extern from "/usr/include/tcl.h":
    cdef struct Tcl_Interp:
        char *result
        void (*freeProc)(char *blockPtr)
        int errorLine

此脚本将失败并显示以下输出：

python3 setup.py build_ext --inplace

如果您将import itfMain import itf itf.jrtk_Init() itfMain.tagsTest()更改为# =========================================================================== # ____ ____ _____ _ # |__ || _ \|_ _| | # | || |_| | | | | |/ | V6.0.0, n/a # | || _ < | | | < ------------------------------------------------ # | ||_| |_| |_| |_|\_| Karlsruhe Institute of Technology, Germany # _| | JANUS Recognition Carnegie Mellon University, USA # \__/ Toolkit # (c) 1993-2017 # =========================================================================== started library: on desktop.3573, Di 15. Mai 21:18:24 CEST 2018 Janus Binary: using lib: ./lib using lib: /home/simon/janus/janus_lt/gui-tcl using lib: /home/simon/janus/janus_lt/tcl-lib using lib: /usr/lib using lib: /usr/lib/tcltk using lib: /usr/lib/tcltk/tcl8.6 using lib: /usr/lib/tcltk/x86_64-linux-gnu using lib: /usr/local/lib/tcltk using lib: /usr/local/share/tcltk using lib: /usr/share/tcltk using lib: /usr/share/tcltk/tcl8.6 using env: TCL_LIBRARY=/usr/lib/tcl8.6 using env: JANUS_LIBRARY=/home/simon/janus/jrtk/library INFO : Using doParallelServer function INFO : This machine (desktop) is running Linux 4.13.0-41-generic (x86_64) with Tcl 8.6 executing library # ============================= {Main Program} ============================== Hello Segmentation fault (core dumped)，则不会发生分段错误。在我的脑海中有这个c lib，它的函数和全局变量都具有来自每个模块的相同值。如果一个模块触发对一个var的更改，则所有模块都会知道。我不得不对这个假设做错，但是发生了什么以及如何解决/解决它？

小问题。 pxd文件中的itf.jrtk_Init()和itfMain.jrtk_Init()之间是否存在差异？

我认为我有一个类似于这个人（https://groups.google.com/forum/#!topic/cython-users/GAAPYb2X304）的类似问题，但我已经有一个动态链接的库。

在几个cython模块上共享全局c变量

0 个答案: