mirror of https://github.com/python/cpython
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
#ifndef Py_CEVAL_H
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#define Py_CEVAL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***********************************************************
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Copyright (c) 2000, BeOpen.com.
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Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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All rights reserved.
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See the file "Misc/COPYRIGHT" for information on usage and
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redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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******************************************************************/
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/* Interface to random parts in ceval.c */
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DL_IMPORT(PyObject *) PyEval_CallObjectWithKeywords
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(PyObject *, PyObject *, PyObject *);
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/* DLL-level Backwards compatibility: */
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#undef PyEval_CallObject
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DL_IMPORT(PyObject *) PyEval_CallObject(PyObject *, PyObject *);
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/* Inline this */
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#define PyEval_CallObject(func,arg) \
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PyEval_CallObjectWithKeywords(func, arg, (PyObject *)NULL)
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DL_IMPORT(PyObject *) PyEval_CallFunction(PyObject *obj, char *format, ...);
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DL_IMPORT(PyObject *) PyEval_CallMethod(PyObject *obj,
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char *methodname, char *format, ...);
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DL_IMPORT(PyObject *) PyEval_GetBuiltins(void);
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DL_IMPORT(PyObject *) PyEval_GetGlobals(void);
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DL_IMPORT(PyObject *) PyEval_GetLocals(void);
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DL_IMPORT(PyObject *) PyEval_GetOwner(void);
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DL_IMPORT(PyObject *) PyEval_GetFrame(void);
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DL_IMPORT(int) PyEval_GetRestricted(void);
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DL_IMPORT(int) Py_FlushLine(void);
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DL_IMPORT(int) Py_AddPendingCall(int (*func)(void *), void *arg);
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DL_IMPORT(int) Py_MakePendingCalls(void);
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/* Interface for threads.
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A module that plans to do a blocking system call (or something else
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that lasts a long time and doesn't touch Python data) can allow other
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threads to run as follows:
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...preparations here...
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Py_BEGIN_ALLOW_THREADS
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...blocking system call here...
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Py_END_ALLOW_THREADS
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...interpret result here...
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The Py_BEGIN_ALLOW_THREADS/Py_END_ALLOW_THREADS pair expands to a
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{}-surrounded block.
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To leave the block in the middle (e.g., with return), you must insert
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a line containing RET_SAVE before the return, e.g.
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if (...premature_exit...) {
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Py_BLOCK_THREADS
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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An alternative is:
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Py_BLOCK_THREADS
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if (...premature_exit...) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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Py_UNBLOCK_THREADS
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For convenience, that the value of 'errno' is restored across
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Py_END_ALLOW_THREADS and RET_SAVE.
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WARNING: NEVER NEST CALLS TO Py_BEGIN_ALLOW_THREADS AND
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Py_END_ALLOW_THREADS!!!
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The function PyEval_InitThreads() should be called only from
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initthread() in "threadmodule.c".
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Note that not yet all candidates have been converted to use this
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mechanism!
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*/
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extern DL_IMPORT(PyThreadState *) PyEval_SaveThread(void);
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extern DL_IMPORT(void) PyEval_RestoreThread(PyThreadState *);
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#ifdef WITH_THREAD
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extern DL_IMPORT(void) PyEval_InitThreads(void);
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extern DL_IMPORT(void) PyEval_AcquireLock(void);
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extern DL_IMPORT(void) PyEval_ReleaseLock(void);
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extern DL_IMPORT(void) PyEval_AcquireThread(PyThreadState *tstate);
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extern DL_IMPORT(void) PyEval_ReleaseThread(PyThreadState *tstate);
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#define Py_BEGIN_ALLOW_THREADS { \
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PyThreadState *_save; \
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_save = PyEval_SaveThread();
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#define Py_BLOCK_THREADS PyEval_RestoreThread(_save);
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#define Py_UNBLOCK_THREADS _save = PyEval_SaveThread();
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#define Py_END_ALLOW_THREADS PyEval_RestoreThread(_save); \
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}
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#else /* !WITH_THREAD */
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#define Py_BEGIN_ALLOW_THREADS {
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#define Py_BLOCK_THREADS
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#define Py_UNBLOCK_THREADS
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#define Py_END_ALLOW_THREADS }
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#endif /* !WITH_THREAD */
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extern DL_IMPORT(int) _PyEval_SliceIndex(PyObject *, int *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_CEVAL_H */
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