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Make file objects as thread safe as the underlying libc FILE* implementation.

Browse source 
close() will now raise an IOError if any operations on the file object
are currently in progress in other threads.

Most code was written by Antoine Pitrou (pitrou).  Additional testing,
documentation and test suite cleanup done by me (gregory.p.smith).

Fixes issue 815646 and 595601 (as well as many other bugs and
references to this problem dating back to the dawn of Python).
This commit is contained in:
Gregory P. Smith 2008-04-06 23:11:17 +00:00
parent ee76777846
commit aa63d0d4af
5 changed files with 373 additions and 83 deletions
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4
Include/fileobject.h
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@ -25,6 +25,8 @@ typedef struct {
int f_skipnextlf; /* Skip next \n */
PyObject *f_encoding;
PyObject *weakreflist; /* List of weak references */
int unlocked_count; /* Num. currently running sections of code
using f_fp with the GIL released. */
} PyFileObject;
PyAPI_DATA(PyTypeObject) PyFile_Type;
@ -38,6 +40,8 @@ PyAPI_FUNC(int) PyFile_SetEncoding(PyObject *, const char *);
PyAPI_FUNC(PyObject *) PyFile_FromFile(FILE *, char *, char *,
int (*)(FILE *));
PyAPI_FUNC(FILE *) PyFile_AsFile(PyObject *);
PyAPI_FUNC(void) PyFile_IncUseCount(PyFileObject *);
PyAPI_FUNC(void) PyFile_DecUseCount(PyFileObject *);
PyAPI_FUNC(PyObject *) PyFile_Name(PyObject *);
PyAPI_FUNC(PyObject *) PyFile_GetLine(PyObject *, int);
PyAPI_FUNC(int) PyFile_WriteObject(PyObject *, PyObject *, int);