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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2009. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions 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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