Revise the interface to the profiling and tracing support for the

Python interpreter.

This change adds two new C-level APIs:  PyEval_SetProfile() and
PyEval_SetTrace().  These can be used to install profile and trace
functions implemented in C, which can operate at much higher speeds
than Python-based functions.  The overhead for calling a C-based
profile function is a very small fraction of a percent of the overhead
involved in calling a Python-based function.

The machinery required to call a Python-based profile or trace
function been moved to sysmodule.c, where sys.setprofile() and
sys.setprofile() simply become users of the new interface.

As a side effect, SF bug #436058 is fixed; there is no longer a
_PyTrace_Init() function to declare.

1 files changed, 8 insertions, 4 deletions

diff --git a/Python/pystate.c b/Python/pystate.c
index 8e5896a..192c4c1 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -120,8 +120,10 @@ PyThreadState_New(PyInterpreterState *interp)
 		tstate->exc_value = NULL;
 		tstate->exc_traceback = NULL;
 
-		tstate->sys_profilefunc = NULL;
-		tstate->sys_tracefunc = NULL;
+		tstate->c_profilefunc = NULL;
+		tstate->c_tracefunc = NULL;
+		tstate->c_profileobj = NULL;
+		tstate->c_traceobj = NULL;
 
 		HEAD_LOCK();
 		tstate->next = interp->tstate_head;
@@ -152,8 +154,10 @@ PyThreadState_Clear(PyThreadState *tstate)
 	ZAP(tstate->exc_value);
 	ZAP(tstate->exc_traceback);
 
-	ZAP(tstate->sys_profilefunc);
-	ZAP(tstate->sys_tracefunc);
+	tstate->c_profilefunc = NULL;
+	tstate->c_tracefunc = NULL;
+	ZAP(tstate->c_profileobj);
+	ZAP(tstate->c_traceobj);
 }