FreeBSD/Linux Kernel Cross Reference
sys/contrib/vchiq/interface/vchi/vchi_cfg_internal.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 VCHI_CFG_INTERNAL_H_
    #define VCHI_CFG_INTERNAL_H_
    
    /****************************************************************************************
     * Control optimisation attempts.
     ***************************************************************************************/
    
    // Don't use lots of short-term locks - use great long ones, reducing the overall locks-per-second
    #define VCHI_COARSE_LOCKING
    
    // Avoid lock then unlock on exit from blocking queue operations (msg tx, bulk rx/tx)
    // (only relevant if VCHI_COARSE_LOCKING)
    #define VCHI_ELIDE_BLOCK_EXIT_LOCK
    
    // Avoid lock on non-blocking peek
    // (only relevant if VCHI_COARSE_LOCKING)
    #define VCHI_AVOID_PEEK_LOCK
    
    // Use one slot-handler thread per connection, rather than 1 thread dealing with all connections in rotation.
    #define VCHI_MULTIPLE_HANDLER_THREADS
    
    // Put free descriptors onto the head of the free queue, rather than the tail, so that we don't thrash
    // our way through the pool of descriptors.
    #define VCHI_PUSH_FREE_DESCRIPTORS_ONTO_HEAD
    
    // Don't issue a MSG_AVAILABLE callback for every single message. Possibly only safe if VCHI_COARSE_LOCKING.
    #define VCHI_FEWER_MSG_AVAILABLE_CALLBACKS
    
    // Don't use message descriptors for TX messages that don't need them
    #define VCHI_MINIMISE_TX_MSG_DESCRIPTORS
    
    // Nano-locks for multiqueue
    //#define VCHI_MQUEUE_NANOLOCKS
    
    // Lock-free(er) dequeuing
    //#define VCHI_RX_NANOLOCKS
    
    #endif /*VCHI_CFG_INTERNAL_H_*/

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