diff options
Diffstat (limited to 'Python/ceval.c')
| -rw-r--r-- | Python/ceval.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/Python/ceval.c b/Python/ceval.c index 5bac65f..bd35185 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -504,6 +504,13 @@ enum why_code { static enum why_code do_raise(PyObject *, PyObject *, PyObject *); static int unpack_iterable(PyObject *, int, PyObject **); +/* Records whether tracing is on for any thread. Counts the number of + threads for which tstate->c_tracefunc is non-NULL, so if the value + is 0, we know we don't have to check this thread's c_tracefunc. + This speeds up the if statement in PyEval_EvalFrameEx() after + fast_next_opcode*/ +static int _Py_TracingPossible = 0; + /* for manipulating the thread switch and periodic "stuff" - used to be per thread, now just a pair o' globals */ int _Py_CheckInterval = 100; @@ -886,7 +893,8 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag) /* line-by-line tracing support */ - if (tstate->c_tracefunc != NULL && !tstate->tracing) { + if (_Py_TracingPossible && + tstate->c_tracefunc != NULL && !tstate->tracing) { /* see maybe_call_line_trace for expository comments */ f->f_stacktop = stack_pointer; @@ -3432,6 +3440,7 @@ PyEval_SetTrace(Py_tracefunc func, PyObject *arg) { PyThreadState *tstate = PyThreadState_GET(); PyObject *temp = tstate->c_traceobj; + _Py_TracingPossible += (func != NULL) - (tstate->c_tracefunc != NULL); Py_XINCREF(arg); tstate->c_tracefunc = NULL; tstate->c_traceobj = NULL; |