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mysql-source/include/my_alarm.h

 

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/* Copyright (C) 2000 MySQL AB

 

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   This program is free software; you can redistribute it and/or modify

 

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   it under the terms of the GNU General Public License as published by

 

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   the Free Software Foundation; version 2 of the License.

 

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   This program is distributed in the hope that it will be useful,

 

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   but WITHOUT ANY WARRANTY; without even the implied warranty of

 

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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 

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   GNU General Public License for more details.

 

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   You should have received a copy of the GNU General Public License

 

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   along with this program; if not, write to the Free Software

 

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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

 

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/*

 

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  File to include when we want to use alarm or a loop_counter to display

 

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  some information when a program is running

 

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*/

 

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#ifndef _my_alarm_h

 

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#define _my_alarm_h

 

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#ifdef  __cplusplus

 

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extern "C" {

 

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#endif

 

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extern int volatile my_have_got_alarm;

 

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extern ulong my_time_to_wait_for_lock;

 

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#if defined(HAVE_ALARM) && !defined(NO_ALARM_LOOP)

 

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#include <signal.h>

 

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#define ALARM_VARIABLES uint alarm_old=0; \

 

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                        sig_return alarm_signal=0

 

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#define ALARM_INIT      my_have_got_alarm=0 ; \

 

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                        alarm_old=(uint) alarm(MY_HOW_OFTEN_TO_ALARM); \

 

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                        alarm_signal=signal(SIGALRM,my_set_alarm_variable);

 

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#define ALARM_END       VOID(signal(SIGALRM,alarm_signal)); \

 

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                        VOID(alarm(alarm_old));

 

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#define ALARM_TEST      my_have_got_alarm

 

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#ifdef DONT_REMEMBER_SIGNAL

 

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#define ALARM_REINIT    VOID(alarm(MY_HOW_OFTEN_TO_ALARM)); \

 

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                        VOID(signal(SIGALRM,my_set_alarm_variable));\

 

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                        my_have_got_alarm=0;

 

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#else

 

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#define ALARM_REINIT    VOID(alarm((uint) MY_HOW_OFTEN_TO_ALARM)); \

 

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                        my_have_got_alarm=0;

 

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#endif /* DONT_REMEMBER_SIGNAL */

 

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#else

 

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#define ALARM_VARIABLES long alarm_pos=0,alarm_end_pos=MY_HOW_OFTEN_TO_WRITE-1

 

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#define ALARM_INIT

 

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#define ALARM_END

 

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#define ALARM_TEST (alarm_pos++ >= alarm_end_pos)

 

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#define ALARM_REINIT alarm_end_pos+=MY_HOW_OFTEN_TO_WRITE

 

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#endif /* HAVE_ALARM */

 

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#ifdef  __cplusplus

 

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}

 

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#endif

 

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#endif

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