The Tor Browser: security/sandbox/chromium/base/win/scoped

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

     2 // Use of this source code is governed by a BSD-style license that can be

     3 // found in the LICENSE file.

     5 #include "base/win/scoped_handle.h"

     7 #include <map>

     9 #include "base/debug/alias.h"

    10 #include "base/lazy_instance.h"

    11 #include "base/synchronization/lock.h"

    12 #include "base/win/windows_version.h"

    14 namespace {

    16 struct Info {

    17   const void* owner;

    18   const void* pc1;

    19   const void* pc2;

    20   DWORD thread_id;

    21 };

    22 typedef std::map<HANDLE, Info> HandleMap;

    24 base::LazyInstance<HandleMap>::Leaky g_handle_map = LAZY_INSTANCE_INITIALIZER;

    25 base::LazyInstance<base::Lock>::Leaky g_lock = LAZY_INSTANCE_INITIALIZER;

    27 }  // namespace

    29 namespace base {

    30 namespace win {

    32 // Static.

    33 void VerifierTraits::StartTracking(HANDLE handle, const void* owner,

    34                                    const void* pc1, const void* pc2) {

    35   // Grab the thread id before the lock.

    36   DWORD thread_id = GetCurrentThreadId();

    38   AutoLock lock(g_lock.Get());

    40   Info handle_info = { owner, pc1, pc2, thread_id };

    41   std::pair<HANDLE, Info> item(handle, handle_info);

    42   std::pair<HandleMap::iterator, bool> result = g_handle_map.Get().insert(item);

    43   if (!result.second) {

    44     Info other = result.first->second;

    45     debug::Alias(&other);

    46     CHECK(false);

    47   }

    48 }

    50 // Static.

    51 void VerifierTraits::StopTracking(HANDLE handle, const void* owner,

    52                                   const void* pc1, const void* pc2) {

    53   AutoLock lock(g_lock.Get());

    54   HandleMap::iterator i = g_handle_map.Get().find(handle);

    55   if (i == g_handle_map.Get().end())

    56     CHECK(false);

    58   Info other = i->second;

    59   if (other.owner != owner) {

    60     debug::Alias(&other);

    61     CHECK(false);

    62   }

    64   g_handle_map.Get().erase(i);

    65 }

    67 }  // namespace win

    68 }  // namespace base

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