history.c

distcc编译器的源代码.好像是readhat公司开发的.

/* -*- c-file-style: "k&r"; c-basic-offset: 4; indent-tabs-mode: nil; -*-
 * 
 * distcc -- A simple distributed compiler system
 *
 * Copyright (C) 2004 by Martin Pool <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */


#include "config.h"
#include <stdlib.h>

#include "distcc.h"
#include "mon.h"
#include "trace.h"

/* Number of previous states to retain for drawing history. */
const int dcc_max_history_queue = 200;


void
dcc_history_push(struct dcc_history *history,
                 enum dcc_phase new_state)
{
     history->now = (history->now + 1) % history->len;
     history->past_phases[history->now] = new_state;
}


struct dcc_history*
dcc_history_new(void)
{
     struct dcc_history *history;
     int i;
     
     history = malloc(sizeof *history);
     if (!history) {
          rs_log_crit("allocation failed!");
          return NULL;
     }
     history->len = dcc_max_history_queue;
     history->now = 0;
     history->past_phases = malloc(history->len * (sizeof *history->past_phases));
     if (!history->past_phases) {
          rs_log_crit("history allocation failed");
          return NULL;
     }

     for (i = 0; i < history->len; i++)
          history->past_phases[i] = DCC_PHASE_DONE;
     
     return history;
}