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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*
*/
#include "eidef.h"
#include "ei_trace.h"
/* this is our lamport clock */
erlang_trace *ei_trace(int query, erlang_trace *token)
{
/* FIXME problem for threaded ? */
static erlang_trace save_token;
static int tracing = 0;
static int clock = 0;
switch (query) {
case -1: /* we are no longer tracing */
tracing = 0;
break;
case 0: /* are we tracing? */
if (tracing) {
clock++;
save_token.prev = save_token.serial++;
return &save_token;
}
break;
case 1: /* we are now tracing */
tracing = 1;
save_token = *token;
if (save_token.serial > clock)
save_token.prev = clock = token->serial;
break;
}
return NULL;
}
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