mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 14:33:32 +03:00
689578a099
Call pthread_mutex_destroy() on not used mutex. Changed comments in .h and .c files from // -> /* */ Added detection of mutex on which one didn't call pthread_mutex_destroy() Fixed bug in create_tmp_field() which causes a memory overrun in queries that uses "ORDER BY constant_expression" Added optimisation for ORDER BY NULL
80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
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(at your option) any later version.
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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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#if defined(__EMX__) || defined(__NETWARE__)
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#include "../mysys/my_lock.c"
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#else
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#undef MAP_TO_USE_RAID /* Avoid RAID mappings */
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#include <my_global.h>
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#include <my_sys.h>
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#include <mysys_err.h>
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#include <my_pthread.h>
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#include <thr_alarm.h>
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#include <errno.h>
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/* Lock a part of a file */
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int my_lock(File fd,int locktype,my_off_t start,my_off_t length,myf MyFlags)
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{
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thr_alarm_t alarmed;
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ALARM alarm_buff;
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uint wait_for_alarm;
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struct flock m_lock;
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DBUG_ENTER("my_lock");
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DBUG_PRINT("my",("Fd: %d Op: %d start: %ld Length: %ld MyFlags: %d",
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fd,locktype,(ulong) start,(ulong) length,MyFlags));
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if (my_disable_locking)
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DBUG_RETURN(0); /* purecov: inspected */
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m_lock.l_type=(short) locktype;
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m_lock.l_whence=0L;
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m_lock.l_start=(long) start;
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m_lock.l_len=(long) length;
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wait_for_alarm=(MyFlags & MY_DONT_WAIT ? MY_HOW_OFTEN_TO_ALARM :
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(uint) 12*60*60);
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if (fcntl(fd,F_SETLK,&m_lock) != -1) /* Check if we can lock */
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DBUG_RETURN(0); /* Ok, file locked */
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DBUG_PRINT("info",("Was locked, trying with alarm"));
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if (!thr_alarm(&alarmed,wait_for_alarm,&alarm_buff))
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{
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int value;
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while ((value=fcntl(fd,F_SETLKW,&m_lock)) && !thr_got_alarm(&alarmed) &&
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errno == EINTR) ;
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thr_end_alarm(&alarmed);
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if (value != -1)
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DBUG_RETURN(0);
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}
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else
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{
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errno=EINTR;
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}
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if (errno == EINTR || errno == EACCES)
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my_errno=EAGAIN; /* Easier to check for this */
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else
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my_errno=errno;
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if (MyFlags & MY_WME)
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{
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if (locktype == F_UNLCK)
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my_error(EE_CANTUNLOCK,MYF(ME_BELL+ME_WAITTANG),errno);
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else
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my_error(EE_CANTLOCK,MYF(ME_BELL+ME_WAITTANG),errno);
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}
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DBUG_PRINT("error",("errno: %d",errno));
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DBUG_RETURN(-1);
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}
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#endif
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