[NaCl SDK] Upate atomic ops in nacl_io

native_client_sdk/src/libraries/nacl_io/mount_node_mem.cc

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "nacl_io/mount_node_mem.h"
 
 #include <errno.h>
 #include <string.h>
 
 #include "nacl_io/osstat.h"
 #include "sdk_util/auto_lock.h"
 
 #define BLOCK_SIZE (1 << 16)
 #define BLOCK_MASK (BLOCK_SIZE - 1)
 
 MountNodeMem::MountNodeMem(Mount* mount)
     : MountNode(mount), data_(NULL), capacity_(0) {
   stat_.st_mode |= S_IFREG;
 }
 
 MountNodeMem::~MountNodeMem() { free(data_); }
 
 Error MountNodeMem::Read(size_t offs, void* buf, size_t count, int* out_bytes) {
   *out_bytes = 0;
 
-  AutoLock lock(&lock_);
+  AUTO_LOCK(node_lock_);
   if (count == 0)
     return 0;
 
   size_t size = stat_.st_size;
 
   if (offs + count > size) {
     count = size - offs;
   }
 
   memcpy(buf, &data_[offs], count);
   *out_bytes = static_cast<int>(count);
   return 0;
 }
 
 Error MountNodeMem::Write(size_t offs,
                           const void* buf,
                           size_t count,
                           int* out_bytes) {
   *out_bytes = 0;
-  AutoLock lock(&lock_);
+  AUTO_LOCK(node_lock_);
 
   if (count == 0)
     return 0;
 
   if (count + offs > stat_.st_size) {
     Error error = FTruncate(count + offs);
     if (error)
       return error;
 
     count = stat_.st_size - offs;
@@ skipping 29 matching lines @@
 
   // If we failed, then adjust size according to what we keep
   if (new_size > capacity_)
     new_size = capacity_;
 
   // Update the size and return the new size
   stat_.st_size = static_cast<off_t>(new_size);
   return EIO;
 }