"Fossies" - the Fresh Open Source Software Archive

Member "stress-ng-0.09.56/core-mlock.c" (15 Mar 2019, 1705 Bytes) of package /linux/privat/stress-ng-0.09.56.tar.xz:


As a special service "Fossies" has tried to format the requested source page into HTML format using (guessed) C and C++ source code syntax highlighting (style: standard) with prefixed line numbers and code folding option. Alternatively you can here view or download the uninterpreted source code file. For more information about "core-mlock.c" see the Fossies "Dox" file reference documentation.

    1 /*
    2  * Copyright (C) 2013-2019 Canonical, Ltd.
    3  *
    4  * This program is free software; you can redistribute it and/or
    5  * modify it under the terms of the GNU General Public License
    6  * as published by the Free Software Foundation; either version 2
    7  * of the License, or (at your option) any later version.
    8  *
    9  * This program is distributed in the hope that it will be useful,
   10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12  * GNU General Public License for more details.
   13  *
   14  * You should have received a copy of the GNU General Public License
   15  * along with this program; if not, write to the Free Software
   16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   17  *
   18  * This code is a complete clean re-write of the stress tool by
   19  * Colin Ian King <colin.king@canonical.com> and attempts to be
   20  * backwardly compatible with the stress tool by Amos Waterland
   21  * <apw@rossby.metr.ou.edu> but has more stress tests and more
   22  * functionality.
   23  *
   24  */
   25 #include "stress-ng.h"
   26 
   27 /*
   28  *  stress_mlock_region
   29  *  mlock a region of memory so it can't be swapped out
   30  *  - used to lock sighandlers for faster response
   31  */
   32 int stress_mlock_region(const void *addr_start, const void *addr_end)
   33 {
   34 #if defined(HAVE_MLOCK)
   35     const size_t page_size = stress_get_pagesize();
   36     void *m_addr_start =
   37         (void *)((ptrdiff_t)addr_start & ~(page_size - 1));
   38     const void *m_addr_end  =
   39         (void *)(((ptrdiff_t)addr_end + page_size - 1) &
   40         ~(page_size - 1));
   41     const size_t len = (ptrdiff_t)m_addr_end - (ptrdiff_t)m_addr_start;
   42 
   43     return mlock((void *)m_addr_start, len);
   44 #else
   45     (void)addr_start;
   46     (void)addr_end;
   47 
   48     return 0;
   49 #endif
   50 }