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101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* 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; 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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/* Alloc a block of locked memory */
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#include "mysys_priv.h"
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#include "mysys_err.h"
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#include <my_list.h>
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#ifdef HAVE_MLOCK
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#include <sys/mman.h>
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struct st_mem_list
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{
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LIST list;
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byte *page;
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uint size;
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};
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LIST *mem_list;
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byte *my_malloc_lock(uint size,myf MyFlags)
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{
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int success;
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uint pagesize=sysconf(_SC_PAGESIZE);
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byte *ptr;
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struct st_mem_list *element;
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DBUG_ENTER("my_malloc_lock");
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size=((size-1) & ~(pagesize-1))+pagesize;
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if (!(ptr=memalign(pagesize,size)))
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{
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if (MyFlags & (MY_FAE+MY_WME))
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my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_WAITTANG),size);
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DBUG_RETURN(0);
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}
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success = mlock((byte*) ptr,size);
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if (success != 0 && geteuid() == 0)
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{
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DBUG_PRINT("warning",("Failed to lock memory. errno %d\n",
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errno));
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fprintf(stderr, "Warning: Failed to lock memory. errno %d\n",
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errno);
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}
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else
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{
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/* Add block in a list for munlock */
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if (!(element=(struct st_mem_list*) my_malloc(sizeof(*element),MyFlags)))
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{
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VOID(munlock((byte*) ptr,size));
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free(ptr);
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DBUG_RETURN(0);
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}
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element->list.data=(byte*) element;
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element->page=ptr;
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element->size=size;
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pthread_mutex_lock(&THR_LOCK_malloc);
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mem_list=list_add(mem_list,&element->list);
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pthread_mutex_unlock(&THR_LOCK_malloc);
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}
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DBUG_RETURN(ptr);
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}
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void my_free_lock(byte *ptr,myf Myflags __attribute__((unused)))
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{
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LIST *list;
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struct st_mem_list *element=0;
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pthread_mutex_lock(&THR_LOCK_malloc);
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for (list=mem_list ; list ; list=list->next)
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{
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element=(struct st_mem_list*) list->data;
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if (ptr == element->page)
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{ /* Found locked mem */
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VOID(munlock((byte*) ptr,element->size));
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mem_list=list_delete(mem_list,list);
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break;
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}
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}
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pthread_mutex_unlock(&THR_LOCK_malloc);
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if (element)
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my_free((gptr) element,MYF(0));
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free(ptr); /* Free even if not locked */
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}
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#endif /* HAVE_MLOCK */
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