vtpm_lock.c

xen虚拟机源代码安装包

// ===================================================================
//
// Copyright (c) 2005, Intel Corp.
// 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 Intel Corporation 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.
// ===================================================================
//
// vtpm_lock.c Provided controlled sync around access to vtpm structures
//
// ===================================================================

#include <pthread.h>
#include "vtpm_lock.h"

static pthread_rwlock_t vtpm_lock;

void vtpm_lock_init() {

  pthread_rwlock_init( &vtpm_lock, NULL);
}

void vtpm_lock_destroy(){
  pthread_rwlock_destroy(&vtpm_lock);
}

void vtpm_lock_rdlock(){
  pthread_rwlock_rdlock(&vtpm_lock);
}

void vtpm_lock_wrlock(){
  pthread_rwlock_wrlock(&vtpm_lock);
}

void vtpm_lock_unlock(){
  pthread_rwlock_unlock(&vtpm_lock);
}