mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 15:50:51 +03:00
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* Copyright (C) 2000-2003 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 */
|
|
|
|
#if defined(__NETWARE__)
|
|
#include "../mysys/my_lock.c"
|
|
#else
|
|
|
|
#undef MAP_TO_USE_RAID /* Avoid RAID mappings */
|
|
#include <my_global.h>
|
|
#include <my_sys.h>
|
|
#include <mysys_err.h>
|
|
#include <my_pthread.h>
|
|
#include <thr_alarm.h>
|
|
#include <errno.h>
|
|
|
|
/* Lock a part of a file */
|
|
|
|
int my_lock(File fd,int locktype,my_off_t start,my_off_t length,myf MyFlags)
|
|
{
|
|
thr_alarm_t alarmed;
|
|
ALARM alarm_buff;
|
|
uint wait_for_alarm;
|
|
struct flock m_lock;
|
|
DBUG_ENTER("my_lock");
|
|
DBUG_PRINT("my",("Fd: %d Op: %d start: %ld Length: %ld MyFlags: %d",
|
|
fd,locktype,(ulong) start,(ulong) length,MyFlags));
|
|
if (my_disable_locking)
|
|
DBUG_RETURN(0); /* purecov: inspected */
|
|
m_lock.l_type=(short) locktype;
|
|
m_lock.l_whence=0L;
|
|
m_lock.l_start=(long) start;
|
|
m_lock.l_len=(long) length;
|
|
wait_for_alarm=(MyFlags & MY_DONT_WAIT ? MY_HOW_OFTEN_TO_ALARM :
|
|
(uint) 12*60*60);
|
|
if (fcntl(fd,F_SETLK,&m_lock) != -1) /* Check if we can lock */
|
|
DBUG_RETURN(0); /* Ok, file locked */
|
|
DBUG_PRINT("info",("Was locked, trying with alarm"));
|
|
if (!thr_alarm(&alarmed,wait_for_alarm,&alarm_buff))
|
|
{
|
|
int value;
|
|
while ((value=fcntl(fd,F_SETLKW,&m_lock)) && !thr_got_alarm(&alarmed) &&
|
|
errno == EINTR) ;
|
|
thr_end_alarm(&alarmed);
|
|
if (value != -1)
|
|
DBUG_RETURN(0);
|
|
}
|
|
else
|
|
{
|
|
errno=EINTR;
|
|
}
|
|
if (errno == EINTR || errno == EACCES)
|
|
my_errno=EAGAIN; /* Easier to check for this */
|
|
else
|
|
my_errno=errno;
|
|
|
|
if (MyFlags & MY_WME)
|
|
{
|
|
if (locktype == F_UNLCK)
|
|
my_error(EE_CANTUNLOCK,MYF(ME_BELL+ME_WAITTANG),errno);
|
|
else
|
|
my_error(EE_CANTLOCK,MYF(ME_BELL+ME_WAITTANG),errno);
|
|
}
|
|
DBUG_PRINT("error",("errno: %d",errno));
|
|
DBUG_RETURN(-1);
|
|
}
|
|
#endif
|