MRAB wrote: > Hi, > > I've been wondering whether it's possible to release the GIL in the > regex engine during matching. > > I know that it needs to have the GIL during memory-management calls, but > does it for calls like Py_UNICODE_TOLOWER or PyErr_SetString? Is there > an easy way to find out? Or is it just a case of checking the source > files for mentions of the GIL? The header file for PyList_New, for > example, doesn't mention it! > > Thanks
Anything that Py_INCREF or Py_DECREF's should have the GIL, or you may get concurrent updating of the value, and then the final value is wrong. (two threads do 5+1 getting 6, rather than 7, and when the decref, you end up at 4 rather than back at 5). AFAIK, the only things that don't require the GIL are macro functions, like PyString_AS_STRING or PyTuple_SET_ITEM. PyErr_SetString, for example, will be increfing and setting the exception state, so certainly needs the GIL to be held. John =:-> _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
