diff options
Diffstat (limited to 'Lib/multiprocessing/synchronize.py')
| -rw-r--r-- | Lib/multiprocessing/synchronize.py | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/Lib/multiprocessing/synchronize.py b/Lib/multiprocessing/synchronize.py index 42624b5..2328d33 100644 --- a/Lib/multiprocessing/synchronize.py +++ b/Lib/multiprocessing/synchronize.py @@ -50,8 +50,8 @@ class SemLock(object): def __init__(self, kind, value, maxvalue, *, ctx): if ctx is None: ctx = context._default_context.get_context() - name = ctx.get_start_method() - unlink_now = sys.platform == 'win32' or name == 'fork' + self.is_fork_ctx = ctx.get_start_method() == 'fork' + unlink_now = sys.platform == 'win32' or self.is_fork_ctx for i in range(100): try: sl = self._semlock = _multiprocessing.SemLock( @@ -103,6 +103,11 @@ class SemLock(object): if sys.platform == 'win32': h = context.get_spawning_popen().duplicate_for_child(sl.handle) else: + if self.is_fork_ctx: + raise RuntimeError('A SemLock created in a fork context is being ' + 'shared with a process in a spawn context. This is ' + 'not supported. Please use the same context to create ' + 'multiprocessing objects and Process.') h = sl.handle return (h, sl.kind, sl.maxvalue, sl.name) |