FreeBSD/Linux Kernel Cross Reference
sys/contrib/vchiq/interface/vchiq_arm/vchiq_killable.h

     /**
      * Copyright (c) 2010-2012 Broadcom. All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions, and the following disclaimer,
      *    without modification.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The names of the above-listed copyright holders may not be used
     *    to endorse or promote products derived from this software without
     *    specific prior written permission.
     *
     * ALTERNATIVELY, this software may be distributed under the terms of the
     * GNU General Public License ("GPL") version 2, as published by the Free
     * Software Foundation.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
     * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #ifndef VCHIQ_KILLABLE_H
    #define VCHIQ_KILLABLE_H
    
    #ifdef notyet
    #include <linux/mutex.h>
    #include <linux/semaphore.h>
    
    #define SHUTDOWN_SIGS   (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT))
    
    static inline int __must_check down_interruptible_killable(struct semaphore *sem)
    {
            /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
            int ret;
            sigset_t blocked, oldset;
            siginitsetinv(&blocked, SHUTDOWN_SIGS);
            sigprocmask(SIG_SETMASK, &blocked, &oldset);
            ret = down_interruptible(sem);
            sigprocmask(SIG_SETMASK, &oldset, NULL);
            return ret;
    }
    #define down_interruptible down_interruptible_killable
    
    
    static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
    {
            /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
            int ret;
            sigset_t blocked, oldset;
            siginitsetinv(&blocked, SHUTDOWN_SIGS);
            sigprocmask(SIG_SETMASK, &blocked, &oldset);
            ret = mutex_lock_interruptible(lock);
            sigprocmask(SIG_SETMASK, &oldset, NULL);
            return ret;
    }
    #define mutex_lock_interruptible mutex_lock_interruptible_killable
    
    #endif
    
    #endif

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