src/libmysql_std/include/my_alarm.h

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/* Copyright (C) 2000 MySQL AB

   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; version 2 of the License.

   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 */

/*
  File to include when we want to use alarm or a loop_counter to display
  some information when a program is running
*/
#ifndef _my_alarm_h
#define _my_alarm_h
#ifdef  __cplusplus
extern "C" {
#endif

extern int volatile my_have_got_alarm;
extern ulong my_time_to_wait_for_lock;

#if defined(HAVE_ALARM) && !defined(NO_ALARM_LOOP)
#include <signal.h>
#define ALARM_VARIABLES uint alarm_old=0; \
                        sig_return alarm_signal=0
#define ALARM_INIT      my_have_got_alarm=0 ; \
                        alarm_old=(uint) alarm(MY_HOW_OFTEN_TO_ALARM); \
                        alarm_signal=signal(SIGALRM,my_set_alarm_variable);
#define ALARM_END       VOID(signal(SIGALRM,alarm_signal)); \
                        VOID(alarm(alarm_old));
#define ALARM_TEST      my_have_got_alarm
#ifdef DONT_REMEMBER_SIGNAL
#define ALARM_REINIT    VOID(alarm(MY_HOW_OFTEN_TO_ALARM)); \
                        VOID(signal(SIGALRM,my_set_alarm_variable));\
                        my_have_got_alarm=0;
#else
#define ALARM_REINIT    VOID(alarm((uint) MY_HOW_OFTEN_TO_ALARM)); \
                        my_have_got_alarm=0;
#endif /* DONT_REMEMBER_SIGNAL */
#else
#define ALARM_VARIABLES long alarm_pos=0,alarm_end_pos=MY_HOW_OFTEN_TO_WRITE-1
#define ALARM_INIT
#define ALARM_END
#define ALARM_TEST (alarm_pos++ >= alarm_end_pos)
#define ALARM_REINIT alarm_end_pos+=MY_HOW_OFTEN_TO_WRITE
#endif /* HAVE_ALARM */

#ifdef  __cplusplus
}
#endif
#endif