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Issue #15894: Document why we don't worry about re-acquiring the

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global import lock after forking.
This commit is contained in:
Brett Cannon 2012-11-15 21:39:36 -05:00
parent 1e1e8aa507
commit e4710cfced
1 changed files with 5 additions and 2 deletions
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7
Python/import.c
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@ -202,8 +202,11 @@ _PyImport_ReInitLock(void)
if (import_lock_level > 1) { if (import_lock_level > 1) {
/* Forked as a side effect of import */ /* Forked as a side effect of import */
long me = PyThread_get_thread_ident(); long me = PyThread_get_thread_ident();
PyThread_acquire_lock(import_lock, 0); /* The following could fail if the lock is already held, but forking as
/* XXX: can the previous line fail? */ a side-effect of an import is a) rare, b) nuts, and c) difficult to
do thanks to the lock only being held when doing individual module
locks per import. */
PyThread_acquire_lock(import_lock, NOWAIT_LOCK);
import_lock_thread = me; import_lock_thread = me;
import_lock_level--; import_lock_level--;
} else { } else {