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Backport of r64212

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Issue #1683: prevent forking from interfering in threading storage.
This commit is contained in:
Martin v. Löwis 2008-12-13 14:59:04 +00:00
parent e9859df798
commit 8a64048a22
5 changed files with 39 additions and 0 deletions
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31
Python/thread.c
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@ -391,4 +391,35 @@ PyThread_delete_key_value(int key)
PyThread_release_lock(keymutex);
}
/* Forget everything not associated with the current thread id.
* This function is called from PyOS_AfterFork(). It is necessary
* because other thread ids which were in use at the time of the fork
* may be reused for new threads created in the forked process.
*/
void
PyThread_ReInitTLS(void)
{
long id = PyThread_get_thread_ident();
struct key *p, **q;
if (!keymutex)
return;
/* As with interpreter_lock in PyEval_ReInitThreads()
we just create a new lock without freeing the old one */
keymutex = PyThread_allocate_lock();
/* Delete all keys which do not match the current thread id */
q = &keyhead;
while ((p = *q) != NULL) {
if (p->id != id) {
*q = p->next;
free((void *)p);
/* NB This does *not* free p->value! */
}
else
q = &p->next;
}
}
#endif /* Py_HAVE_NATIVE_TLS */