mirror of
https://github.com/python/cpython.git
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ec0082ca46
Remove functions in the C API: * PyEval_AcquireLock() * PyEval_ReleaseLock() * PyEval_InitThreads() * PyEval_ThreadsInitialized() But keep these functions in the stable ABI. Mention "make regen-limited-abi" in "make regen-all".
139 lines
4.8 KiB
C
139 lines
4.8 KiB
C
/* Interface to random parts in ceval.c */
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#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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PyAPI_FUNC(PyObject *) PyEval_EvalCode(PyObject *, PyObject *, PyObject *);
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PyAPI_FUNC(PyObject *) PyEval_EvalCodeEx(PyObject *co,
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PyObject *globals,
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PyObject *locals,
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PyObject *const *args, int argc,
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PyObject *const *kwds, int kwdc,
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PyObject *const *defs, int defc,
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PyObject *kwdefs, PyObject *closure);
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PyAPI_FUNC(PyObject *) PyEval_GetBuiltins(void);
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PyAPI_FUNC(PyObject *) PyEval_GetGlobals(void);
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PyAPI_FUNC(PyObject *) PyEval_GetLocals(void);
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PyAPI_FUNC(PyFrameObject *) PyEval_GetFrame(void);
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PyAPI_FUNC(int) Py_AddPendingCall(int (*func)(void *), void *arg);
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PyAPI_FUNC(int) Py_MakePendingCalls(void);
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/* Protection against deeply nested recursive calls
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In Python 3.0, this protection has two levels:
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* normal anti-recursion protection is triggered when the recursion level
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exceeds the current recursion limit. It raises a RecursionError, and sets
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the "overflowed" flag in the thread state structure. This flag
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temporarily *disables* the normal protection; this allows cleanup code
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to potentially outgrow the recursion limit while processing the
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RecursionError.
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* "last chance" anti-recursion protection is triggered when the recursion
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level exceeds "current recursion limit + 50". By construction, this
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protection can only be triggered when the "overflowed" flag is set. It
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means the cleanup code has itself gone into an infinite loop, or the
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RecursionError has been mistakingly ignored. When this protection is
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triggered, the interpreter aborts with a Fatal Error.
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In addition, the "overflowed" flag is automatically reset when the
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recursion level drops below "current recursion limit - 50". This heuristic
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is meant to ensure that the normal anti-recursion protection doesn't get
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disabled too long.
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Please note: this scheme has its own limitations. See:
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http://mail.python.org/pipermail/python-dev/2008-August/082106.html
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for some observations.
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*/
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PyAPI_FUNC(void) Py_SetRecursionLimit(int);
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PyAPI_FUNC(int) Py_GetRecursionLimit(void);
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PyAPI_FUNC(int) Py_EnterRecursiveCall(const char *where);
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PyAPI_FUNC(void) Py_LeaveRecursiveCall(void);
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PyAPI_FUNC(const char *) PyEval_GetFuncName(PyObject *);
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PyAPI_FUNC(const char *) PyEval_GetFuncDesc(PyObject *);
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PyAPI_FUNC(PyObject *) PyEval_EvalFrame(PyFrameObject *);
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PyAPI_FUNC(PyObject *) PyEval_EvalFrameEx(PyFrameObject *f, int exc);
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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 Py_BLOCK_THREADS 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_OSError);
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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_OSError);
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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 Py_BLOCK_THREADS.
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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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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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PyAPI_FUNC(PyThreadState *) PyEval_SaveThread(void);
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PyAPI_FUNC(void) PyEval_RestoreThread(PyThreadState *);
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PyAPI_FUNC(void) PyEval_AcquireThread(PyThreadState *tstate);
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PyAPI_FUNC(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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/* Masks and values used by FORMAT_VALUE opcode. */
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#define FVC_MASK 0x3
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#define FVC_NONE 0x0
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#define FVC_STR 0x1
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#define FVC_REPR 0x2
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#define FVC_ASCII 0x3
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#define FVS_MASK 0x4
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#define FVS_HAVE_SPEC 0x4
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#ifndef Py_LIMITED_API
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# define Py_CPYTHON_CEVAL_H
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# include "cpython/ceval.h"
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# undef Py_CPYTHON_CEVAL_H
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#endif
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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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