iframe-proxy | Sunbelt Computer Software

History

145 lines (114 loc) · 5 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

/* Interface to random parts in ceval.c */

#ifndef Py_CEVAL_H

#define Py_CEVAL_H

#ifdef __cplusplus

extern "C" {

#endif

PyAPI_FUNC(PyObject *) PyEval_EvalCode(PyObject *, PyObject *, PyObject *);

PyAPI_FUNC(PyObject *) PyEval_EvalCodeEx(PyObject *co,

PyObject *globals,

PyObject *locals,

PyObject *const *args, int argc,

PyObject *const *kwds, int kwdc,

PyObject *const *defs, int defc,

PyObject *kwdefs, PyObject *closure);

PyAPI_FUNC(PyObject *) PyEval_GetBuiltins(void);

PyAPI_FUNC(PyObject *) PyEval_GetGlobals(void);

PyAPI_FUNC(PyObject *) PyEval_GetLocals(void);

PyAPI_FUNC(PyFrameObject *) PyEval_GetFrame(void);

PyAPI_FUNC(PyObject *) PyEval_GetFrameBuiltins(void);

PyAPI_FUNC(PyObject *) PyEval_GetFrameGlobals(void);

PyAPI_FUNC(PyObject *) PyEval_GetFrameLocals(void);

PyAPI_FUNC(int) Py_AddPendingCall(int (*func)(void *), void *arg);

PyAPI_FUNC(int) Py_MakePendingCalls(void);

/* Protection against deeply nested recursive calls

In Python 3.0, this protection has two levels:

* normal anti-recursion protection is triggered when the recursion level

exceeds the current recursion limit. It raises a RecursionError, and sets

the "overflowed" flag in the thread state structure. This flag

temporarily *disables* the normal protection; this allows cleanup code

to potentially outgrow the recursion limit while processing the

RecursionError.

* "last chance" anti-recursion protection is triggered when the recursion

level exceeds "current recursion limit + 50". By construction, this

protection can only be triggered when the "overflowed" flag is set. It

means the cleanup code has itself gone into an infinite loop, or the

RecursionError has been mistakenly ignored. When this protection is

triggered, the interpreter aborts with a Fatal Error.

In addition, the "overflowed" flag is automatically reset when the

recursion level drops below "current recursion limit - 50". This heuristic

is meant to ensure that the normal anti-recursion protection doesn't get

disabled too long.

Please note: this scheme has its own limitations. See:

http://mail.python.org/pipermail/python-dev/2008-August/082106.html

for some observations.

PyAPI_FUNC(void) Py_SetRecursionLimit(int);

PyAPI_FUNC(int) Py_GetRecursionLimit(void);

PyAPI_FUNC(int) Py_EnterRecursiveCall(const char *where);

PyAPI_FUNC(void) Py_LeaveRecursiveCall(void);

PyAPI_FUNC(const char *) PyEval_GetFuncName(PyObject *);

PyAPI_FUNC(const char *) PyEval_GetFuncDesc(PyObject *);

PyAPI_FUNC(PyObject *) PyEval_EvalFrame(PyFrameObject *);

PyAPI_FUNC(PyObject *) PyEval_EvalFrameEx(PyFrameObject *f, int exc);

/* Interface for threads.

A module that plans to do a blocking system call (or something else

that lasts a long time and doesn't touch Python data) can allow other

threads to run as follows:

...preparations here...

Py_BEGIN_ALLOW_THREADS

...blocking system call here...

Py_END_ALLOW_THREADS

...interpret result here...

The Py_BEGIN_ALLOW_THREADS/Py_END_ALLOW_THREADS pair expands to a

{}-surrounded block.

To leave the block in the middle (e.g., with return), you must insert

a line containing Py_BLOCK_THREADS before the return, e.g.

if (...premature_exit...) {

Py_BLOCK_THREADS

PyErr_SetFromErrno(PyExc_OSError);

return NULL;

}

An alternative is:

Py_BLOCK_THREADS

if (...premature_exit...) {

PyErr_SetFromErrno(PyExc_OSError);

return NULL;

}

Py_UNBLOCK_THREADS

For convenience, that the value of 'errno' is restored across

Py_END_ALLOW_THREADS and Py_BLOCK_THREADS.

WARNING: NEVER NEST CALLS TO Py_BEGIN_ALLOW_THREADS AND

Py_END_ALLOW_THREADS!!!

Note that not yet all candidates have been converted to use this

mechanism!

PyAPI_FUNC(PyThreadState *) PyEval_SaveThread(void);

PyAPI_FUNC(void) PyEval_RestoreThread(PyThreadState *);

Py_DEPRECATED(3.9) PyAPI_FUNC(void) PyEval_InitThreads(void);

PyAPI_FUNC(void) PyEval_AcquireThread(PyThreadState *tstate);

PyAPI_FUNC(void) PyEval_ReleaseThread(PyThreadState *tstate);

#define Py_BEGIN_ALLOW_THREADS { \

PyThreadState *_save; \

_save = PyEval_SaveThread();

#define Py_BLOCK_THREADS PyEval_RestoreThread(_save);

#define Py_UNBLOCK_THREADS _save = PyEval_SaveThread();

#define Py_END_ALLOW_THREADS PyEval_RestoreThread(_save); \

}

/* Masks and values used by FORMAT_VALUE opcode. */

#define FVC_MASK 0x3

#define FVC_NONE 0x0

#define FVC_STR 0x1

#define FVC_REPR 0x2

#define FVC_ASCII 0x3

#define FVS_MASK 0x4

#define FVS_HAVE_SPEC 0x4

#ifndef Py_LIMITED_API

# define Py_CPYTHON_CEVAL_H

# include "cpython/ceval.h"

# undef Py_CPYTHON_CEVAL_H

#endif

#ifdef __cplusplus

}

#endif

#endif /* !Py_CEVAL_H */

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Sunbelt Computer Software

PL/B Language Development and Support

FilesExpand file tree

ceval.h

Latest commit

History

ceval.h

File metadata and controls