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Current File : //usr/include/mysql/server/private/my_alarm.h

/*
   Copyright (c) 2000, 2010, Oracle and/or its affiliates.

   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  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>
#ifdef HAVE_SIGHANDLER_T
#define sig_return sighandler_t
#elif defined(SOLARIS) || defined(__sun) || defined(__APPLE__) || \
    defined(_AIX) || \
    defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || \
    defined(__DragonFly__)
typedef void (*sig_return)(int); /* Returns type from signal */
#else
typedef void (*sig_return)(void); /* Returns type from signal */
#endif
#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 SIGNAL_HANDLER_RESET_ON_DELIVERY
#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 /* SIGNAL_HANDLER_RESET_ON_DELIVERY */
#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