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Fix bug 683658 - PyErr_Warn may cause import deadlock.

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This commit is contained in:
Mark Hammond 2003-02-19 00:33:33 +00:00
parent 4ccf3e14f0
commit a43fd0c899
3 changed files with 19 additions and 6 deletions
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9
Python/errors.c
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@ -600,18 +600,17 @@ PyErr_WriteUnraisable(PyObject *obj)
Py_XDECREF(tb);
}
extern PyObject *PyModule_WarningsModule;
/* Function to issue a warning message; may raise an exception. */
int
PyErr_Warn(PyObject *category, char *message)
{
PyObject *mod, *dict, *func = NULL;
PyObject *dict, *func = NULL;
mod = PyImport_ImportModule("warnings");
if (mod != NULL) {
dict = PyModule_GetDict(mod);
if (PyModule_WarningsModule != NULL) {
dict = PyModule_GetDict(PyModule_WarningsModule);
func = PyDict_GetItemString(dict, "warn");
Py_DECREF(mod);
}
if (func == NULL) {
PySys_WriteStderr("warning: %s\n", message);

11
Python/pythonrun.c
View file

@ -60,6 +60,11 @@ int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */
true divisions (which they will be in 2.3). */
int _Py_QnewFlag = 0;
/* Reference to 'warnings' module, to avoid importing it
on the fly when the import lock may be held. See 683658
*/
PyObject *PyModule_WarningsModule = NULL;
static int initialized = 0;
/* API to access the initialized flag -- useful for esoteric use */
@ -169,6 +174,8 @@ Py_Initialize(void)
_PyImportHooks_Init();
PyModule_WarningsModule = PyImport_ImportModule("warnings");
initsigs(); /* Signal handling stuff, including initintr() */
initmain(); /* Module __main__ */
@ -225,6 +232,10 @@ Py_Finalize(void)
/* Cleanup Codec registry */
_PyCodecRegistry_Fini();
/* drop module references we saved */
Py_XDECREF(PyModule_WarningsModule);
PyModule_WarningsModule = NULL;
/* Destroy all modules */
PyImport_Cleanup();