亁颐堂乾颐盾Python网络编程PyQYT项目.zip

/***** Support code for embedding *****/ #if defined(_MSC_VER) # define CFFI_DLLEXPORT __declspec(dllexport) #elif defined(__GNUC__) # define CFFI_DLLEXPORT __attribute__((visibility("default"))) #else # define CFFI_DLLEXPORT /* nothing */ #endif /* There are two global variables of type _cffi_call_python_fnptr: * _cffi_call_python, which we declare just below, is the one called by ``extern "Python"`` implementations. * _cffi_call_python_org, which on CPython is actually part of the _cffi_exports[] array, is the function pointer copied from _cffi_backend. After initialization is complete, both are equal. However, the first one remains equal to &_cffi_start_and_call_python until the very end of initialization, when we are (or should be) sure that concurrent threads also see a completely initialized world, and only then is it changed. */ #undef _cffi_call_python typedef void (*_cffi_call_python_fnptr)(struct _cffi_externpy_s *, char *); static void _cffi_start_and_call_python(struct _cffi_externpy_s *, char *); static _cffi_call_python_fnptr _cffi_call_python = &_cffi_start_and_call_python; #ifndef _MSC_VER /* --- Assuming a GCC not infinitely old --- */ # define cffi_compare_and_swap(l,o,n) __sync_bool_compare_and_swap(l,o,n) # define cffi_write_barrier() __sync_synchronize() # if !defined(__amd64__) && !defined(__x86_64__) && \ !defined(__i386__) && !defined(__i386) # define cffi_read_barrier() __sync_synchronize() # else # define cffi_read_barrier() (void)0 # endif #else /* --- Windows threads version --- */ # include <Windows.h> # define cffi_compare_and_swap(l,o,n) \ (InterlockedCompareExchangePointer(l,n,o) == (o)) # define cffi_write_barrier() InterlockedCompareExchange(&_cffi_dummy,0,0) # define cffi_read_barrier() (void)0 static volatile LONG _cffi_dummy; #endif #ifdef WITH_THREAD # ifndef _MSC_VER # include <pthread.h> static pthread_mutex_t _cffi_embed_startup_lock; # else static CRITICAL_SECTION _cffi_embed_startup_lock; # endif static char _cffi_embed_startup_lock_ready = 0; #endif static void _cffi_acquire_reentrant_mutex(void) { static void *volatile lock = NULL; while (!cffi_compare_and_swap(&lock, NULL, (void *)1)) { /* should ideally do a spin loop instruction here, but hard to do it portably and doesn't really matter I think: pthread_mutex_init() should be very fast, and this is only run at start-up anyway. */ } #ifdef WITH_THREAD if (!_cffi_embed_startup_lock_ready) { # ifndef _MSC_VER pthread_mutexattr_t attr; pthread_mutexattr_init(&attr); pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); pthread_mutex_init(&_cffi_embed_startup_lock, &attr); # else InitializeCriticalSection(&_cffi_embed_startup_lock); # endif _cffi_embed_startup_lock_ready = 1; } #endif while (!cffi_compare_and_swap(&lock, (void *)1, NULL)) ; #ifndef _MSC_VER pthread_mutex_lock(&_cffi_embed_startup_lock); #else EnterCriticalSection(&_cffi_embed_startup_lock); #endif } static void _cffi_release_reentrant_mutex(void) { #ifndef _MSC_VER pthread_mutex_unlock(&_cffi_embed_startup_lock); #else LeaveCriticalSection(&_cffi_embed_startup_lock); #endif } /********** CPython-specific section **********/ #ifndef PYPY_VERSION #define _cffi_call_python_org _cffi_exports[_CFFI_CPIDX] PyMODINIT_FUNC _CFFI_PYTHON_STARTUP_FUNC(void); /* forward */ static void _cffi_py_initialize(void) { /* XXX use initsigs=0, which "skips initialization registration of signal handlers, which might be useful when Python is embedded" according to the Python docs. But review and think if it should be a user-controllable setting. XXX we should also give a way to write errors to a buffer instead of to stderr. XXX if importing 'site' fails, CPython (any version) calls exit(). Should we try to work around this behavior here? */ Py_InitializeEx(0); } static int _cffi_initialize_python(void) { /* This initializes Python, imports _cffi_backend, and then the present .dll/.so is set up as a CPython C extension module. */ int result; PyGILState_STATE state; PyObject *pycode=NULL, *global_dict=NULL, *x; #if PY_MAJOR_VERSION >= 3 /* see comments in _cffi_carefully_make_gil() about the Python2/Python3 difference */ #else /* Acquire the GIL. We have no threadstate here. If Python is already initialized, it is possible that there is already one existing for this thread, but it is not made current now. */ PyEval_AcquireLock(); _cffi_py_initialize(); /* The Py_InitializeEx() sometimes made a threadstate for us, but not always. Indeed Py_InitializeEx() could be called and do nothing. So do we have a threadstate, or not? We don't know, but we can replace it with NULL in all cases. */ (void)PyThreadState_Swap(NULL); /* Now we can release the GIL and re-acquire immediately using the logic of PyGILState(), which handles making or installing the correct threadstate. */ PyEval_ReleaseLock(); #endif state = PyGILState_Ensure(); /* Call the initxxx() function from the present module. It will create and initialize us as a CPython extension module, instead of letting the startup Python code do it---it might reimport the same .dll/.so and get maybe confused on some platforms. It might also have troubles locating the .dll/.so again for all I know. */ (void)_CFFI_PYTHON_STARTUP_FUNC(); if (PyErr_Occurred()) goto error; /* Now run the Python code provided to ffi.embedding_init_code(). */ pycode = Py_CompileString(_CFFI_PYTHON_STARTUP_CODE, "<init code for '" _CFFI_MODULE_NAME "'>", Py_file_input); if (pycode == NULL) goto error; global_dict = PyDict_New(); if (global_dict == NULL) goto error; if (PyDict_SetItemString(global_dict, "__builtins__", PyThreadState_GET()->interp->builtins) < 0) goto error; x = PyEval_EvalCode( #if PY_MAJOR_VERSION < 3 (PyCodeObject *) #endif pycode, global_dict, global_dict); if (x == NULL) goto error; Py_DECREF(x); /* Done! Now if we've been called from _cffi_start_and_call_python() in an ``extern "Python"``, we can only hope that the Python code did correctly set up the corresponding @ffi.def_extern() function. Otherwise, the general logic of ``extern "Python"`` functions (inside the _cffi_backend module) will find that the reference is still missing and print an error. */ result = 0; done: Py_XDECREF(pycode); Py_XDECREF(global_dict); PyGILState_Release(state); return result; error:; { /* Print as much information as potentially useful. Debugging load-time failures with embedding is not fun */ PyObject *exception, *v, *tb, *f, *modules, *mod; PyErr_Fetch(&exception, &v, &tb); if (exception != NULL) { PyErr_NormalizeException(&exception, &v, &tb); PyErr_Display(exception, v, tb); } Py_XDECREF(exception); Py_XDECREF(v); Py_XDECREF(tb); f = PySys_GetObject((char *)"stderr"); if (f != NULL && f != Py_None) { PyFile_WriteString("\nFrom: " _CFFI_MODULE_NAME "\ncompiled with cffi version: 1.6.0" "\n_cffi_backend module: ", f); modules = PyImport_GetModuleDict(); mod = PyDict_GetItemString(modules, "_cffi_backend"); i