| /* |
| * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved. |
| * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. |
| * |
| * This file is part of LVM2. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU Lesser General Public License v.2.1. |
| * |
| * You should have received a copy of the GNU Lesser General Public License |
| * along with this program; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef LVM_MEMLOCK_H |
| #define LVM_MEMLOCK_H |
| |
| struct cmd_context; |
| |
| /* |
| * Inside a critical section, memory is always locked. |
| * |
| * After leaving the critical section, memory stays locked until |
| * memlock_unlock() is called. This happens with |
| * sync_local_dev_names() and sync_dev_names(). |
| * |
| * This allows critical sections to be entered and exited repeatedly without |
| * incurring the expense of locking memory every time. |
| * |
| * memlock_reset() is necessary to clear the state after forking (polldaemon). |
| */ |
| |
| void critical_section_inc(struct cmd_context *cmd, const char *reason); |
| void critical_section_dec(struct cmd_context *cmd, const char *reason); |
| int critical_section(void); |
| void memlock_inc_daemon(struct cmd_context *cmd); |
| void memlock_dec_daemon(struct cmd_context *cmd); |
| int memlock_count_daemon(void); |
| void memlock_init(struct cmd_context *cmd); |
| void memlock_reset(void); |
| void memlock_unlock(struct cmd_context *cmd); |
| |
| #endif |