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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
commit | a175314c3e5827eb193872241446f2f8f5c9d33c (patch) | |
tree | cd3d60ca99ae00829c52a6ca79150a5b6e62528b /mysys/my_lockmem.c | |
parent | Initial commit. (diff) | |
download | mariadb-10.5-a175314c3e5827eb193872241446f2f8f5c9d33c.tar.xz mariadb-10.5-a175314c3e5827eb193872241446f2f8f5c9d33c.zip |
Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | mysys/my_lockmem.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/mysys/my_lockmem.c b/mysys/my_lockmem.c new file mode 100644 index 00000000..e159502a --- /dev/null +++ b/mysys/my_lockmem.c @@ -0,0 +1,97 @@ +/* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. + + 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 */ + +/* Alloc a block of locked memory */ + +#include "mysys_priv.h" +#include "mysys_err.h" +#include <my_list.h> + +#ifdef HAVE_MLOCK + +struct st_mem_list +{ + LIST list; + uchar *page; + uint size; +}; + +LIST *mem_list; + +uchar *my_malloc_lock(uint size,myf MyFlags) +{ + int success; + uint pagesize=sysconf(_SC_PAGESIZE); + uchar *ptr; + struct st_mem_list *element; + DBUG_ENTER("my_malloc_lock"); + + size=((size-1) & ~(pagesize-1))+pagesize; + if (!(ptr=memalign(pagesize,size))) + { + if (MyFlags & (MY_FAE+MY_WME)) + my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_FATAL), size); + DBUG_RETURN(0); + } + success = mlock((uchar*) ptr,size); + if (success != 0 && geteuid() == 0) + { + DBUG_PRINT("warning",("Failed to lock memory. errno %d\n", + errno)); + fprintf(stderr, "Warning: Failed to lock memory. errno %d\n", + errno); + } + else + { + /* Add block in a list for munlock */ + if (!(element=(struct st_mem_list*) my_malloc(sizeof(*element),MyFlags))) + { + (void) munlock((uchar*) ptr,size); + free(ptr); + DBUG_RETURN(0); + } + element->list.data=(uchar*) element; + element->page=ptr; + element->size=size; + mysql_mutex_lock(&THR_LOCK_malloc); + mem_list=list_add(mem_list,&element->list); + mysql_mutex_unlock(&THR_LOCK_malloc); + } + DBUG_RETURN(ptr); +} + + +void my_free_lock(uchar *ptr) +{ + LIST *list; + struct st_mem_list *element=0; + + mysql_mutex_lock(&THR_LOCK_malloc); + for (list=mem_list ; list ; list=list->next) + { + element=(struct st_mem_list*) list->data; + if (ptr == element->page) + { /* Found locked mem */ + (void) munlock((uchar*) ptr,element->size); + mem_list=list_delete(mem_list,list); + break; + } + } + mysql_mutex_unlock(&THR_LOCK_malloc); + my_free(element); + free(ptr); /* Free even if not locked */ +} + +#endif /* HAVE_MLOCK */ |