text: /* Copyright (c) 2009, Google Inc.
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   * 
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * 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.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   * 
   * 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.
   *
   * ---
   * This file is a Posix-specific part of spinlock_internal.cc
   */
  
  #include <config.h>
  #include <errno.h>
  #ifdef HAVE_SCHED_H
  #include <sched.h>      /* For sched_yield() */
  #endif
  #include <time.h>       /* For nanosleep() */
  
  namespace base {
  namespace internal {
  
  void SpinLockDelay(volatile Atomic32 *w, int32 value, int loop) {
    int save_errno = errno;
    if (loop == 0) {
    } else if (loop == 1) {
      sched_yield();
    } else {
      struct timespec tm;
      tm.tv_sec = 0;
      tm.tv_nsec = 1000000;
      nanosleep(&tm, NULL);
    }
    errno = save_errno;
  }
  
  void SpinLockWake(volatile Atomic32 *w, bool all) {
  }
  
  } // namespace internal
  } // namespace base
  