1*a0b87461SOleksandr Tymoshenko /**
2*a0b87461SOleksandr Tymoshenko * Copyright (c) 2010-2012 Broadcom. All rights reserved.
3*a0b87461SOleksandr Tymoshenko *
4*a0b87461SOleksandr Tymoshenko * Redistribution and use in source and binary forms, with or without
5*a0b87461SOleksandr Tymoshenko * modification, are permitted provided that the following conditions
6*a0b87461SOleksandr Tymoshenko * are met:
7*a0b87461SOleksandr Tymoshenko * 1. Redistributions of source code must retain the above copyright
8*a0b87461SOleksandr Tymoshenko * notice, this list of conditions, and the following disclaimer,
9*a0b87461SOleksandr Tymoshenko * without modification.
10*a0b87461SOleksandr Tymoshenko * 2. Redistributions in binary form must reproduce the above copyright
11*a0b87461SOleksandr Tymoshenko * notice, this list of conditions and the following disclaimer in the
12*a0b87461SOleksandr Tymoshenko * documentation and/or other materials provided with the distribution.
13*a0b87461SOleksandr Tymoshenko * 3. The names of the above-listed copyright holders may not be used
14*a0b87461SOleksandr Tymoshenko * to endorse or promote products derived from this software without
15*a0b87461SOleksandr Tymoshenko * specific prior written permission.
16*a0b87461SOleksandr Tymoshenko *
17*a0b87461SOleksandr Tymoshenko * ALTERNATIVELY, this software may be distributed under the terms of the
18*a0b87461SOleksandr Tymoshenko * GNU General Public License ("GPL") version 2, as published by the Free
19*a0b87461SOleksandr Tymoshenko * Software Foundation.
20*a0b87461SOleksandr Tymoshenko *
21*a0b87461SOleksandr Tymoshenko * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22*a0b87461SOleksandr Tymoshenko * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23*a0b87461SOleksandr Tymoshenko * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24*a0b87461SOleksandr Tymoshenko * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25*a0b87461SOleksandr Tymoshenko * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26*a0b87461SOleksandr Tymoshenko * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27*a0b87461SOleksandr Tymoshenko * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28*a0b87461SOleksandr Tymoshenko * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29*a0b87461SOleksandr Tymoshenko * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30*a0b87461SOleksandr Tymoshenko * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31*a0b87461SOleksandr Tymoshenko * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32*a0b87461SOleksandr Tymoshenko */
33*a0b87461SOleksandr Tymoshenko
34*a0b87461SOleksandr Tymoshenko #ifndef VCHIQ_KILLABLE_H
35*a0b87461SOleksandr Tymoshenko #define VCHIQ_KILLABLE_H
36*a0b87461SOleksandr Tymoshenko
37*a0b87461SOleksandr Tymoshenko #ifdef notyet
38*a0b87461SOleksandr Tymoshenko #include <linux/mutex.h>
39*a0b87461SOleksandr Tymoshenko #include <linux/semaphore.h>
40*a0b87461SOleksandr Tymoshenko
41*a0b87461SOleksandr Tymoshenko #define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT))
42*a0b87461SOleksandr Tymoshenko
down_interruptible_killable(struct semaphore * sem)43*a0b87461SOleksandr Tymoshenko static inline int __must_check down_interruptible_killable(struct semaphore *sem)
44*a0b87461SOleksandr Tymoshenko {
45*a0b87461SOleksandr Tymoshenko /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
46*a0b87461SOleksandr Tymoshenko int ret;
47*a0b87461SOleksandr Tymoshenko sigset_t blocked, oldset;
48*a0b87461SOleksandr Tymoshenko siginitsetinv(&blocked, SHUTDOWN_SIGS);
49*a0b87461SOleksandr Tymoshenko sigprocmask(SIG_SETMASK, &blocked, &oldset);
50*a0b87461SOleksandr Tymoshenko ret = down_interruptible(sem);
51*a0b87461SOleksandr Tymoshenko sigprocmask(SIG_SETMASK, &oldset, NULL);
52*a0b87461SOleksandr Tymoshenko return ret;
53*a0b87461SOleksandr Tymoshenko }
54*a0b87461SOleksandr Tymoshenko #define down_interruptible down_interruptible_killable
55*a0b87461SOleksandr Tymoshenko
56*a0b87461SOleksandr Tymoshenko
mutex_lock_interruptible_killable(struct mutex * lock)57*a0b87461SOleksandr Tymoshenko static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
58*a0b87461SOleksandr Tymoshenko {
59*a0b87461SOleksandr Tymoshenko /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
60*a0b87461SOleksandr Tymoshenko int ret;
61*a0b87461SOleksandr Tymoshenko sigset_t blocked, oldset;
62*a0b87461SOleksandr Tymoshenko siginitsetinv(&blocked, SHUTDOWN_SIGS);
63*a0b87461SOleksandr Tymoshenko sigprocmask(SIG_SETMASK, &blocked, &oldset);
64*a0b87461SOleksandr Tymoshenko ret = mutex_lock_interruptible(lock);
65*a0b87461SOleksandr Tymoshenko sigprocmask(SIG_SETMASK, &oldset, NULL);
66*a0b87461SOleksandr Tymoshenko return ret;
67*a0b87461SOleksandr Tymoshenko }
68*a0b87461SOleksandr Tymoshenko #define mutex_lock_interruptible mutex_lock_interruptible_killable
69*a0b87461SOleksandr Tymoshenko
70*a0b87461SOleksandr Tymoshenko #endif
71*a0b87461SOleksandr Tymoshenko
72*a0b87461SOleksandr Tymoshenko #endif
73