diff options
Diffstat (limited to 'Doc/c-api')
| -rw-r--r-- | Doc/c-api/file.rst | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/Doc/c-api/file.rst b/Doc/c-api/file.rst index 1bb5b22..e107268 100644 --- a/Doc/c-api/file.rst +++ b/Doc/c-api/file.rst @@ -58,10 +58,42 @@ change in future releases of Python. closed. Return *NULL* on failure. -.. cfunction:: FILE* PyFile_AsFile(PyObject *p) +.. cfunction:: FILE* PyFile_AsFile(PyObject \*p) Return the file object associated with *p* as a :ctype:`FILE\*`. + If the caller will ever use the returned :ctype:`FILE\*` object while + the GIL is released it must also call the `PyFile_IncUseCount` and + `PyFile_DecUseCount` functions described below as appropriate. + + +.. cfunction:: void PyFile_IncUseCount(PyFileObject \*p) + + Increments the PyFileObject's internal use count to indicate + that the underlying :ctype:`FILE\*` is being used. + This prevents Python from calling f_close() on it from another thread. + Callers of this must call `PyFile_DecUseCount` when they are + finished with the :ctype:`FILE\*`. Otherwise the file object will + never be closed by Python. + + The GIL must be held while calling this function. + + The suggested use is to call this after `PyFile_AsFile` just before + you release the GIL. + + .. versionadded:: 2.6 + + +.. cfunction:: void PyFile_DecUseCount(PyFileObject \*p) + + Decrements the PyFileObject's internal unlocked_count member to + indicate that the caller is done with its own use of the :ctype:`FILE\*`. + This may only be called to undo a prior call to `PyFile_IncUseCount`. + + The GIL must be held while calling this function. + + .. versionadded:: 2.6 + .. cfunction:: PyObject* PyFile_GetLine(PyObject *p, int n) |