LCOV - app.info - ipc/chromium/src/base/lazy_instance.cc

LCOV - code coverage report
| Current view: | directory - ipc/chromium/src/base - lazy_instance.cc (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 9 | 7 | 77.8 %
| Date: | 2012-06-02 | Functions: | 1 | 1 | 100.0 %

           1                 : // Copyright (c) 2008 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.
           4                 :
           5                 : #include "base/lazy_instance.h"
           6                 :
           7                 : #include "base/at_exit.h"
           8                 : #include "base/atomicops.h"
           9                 : #include "base/basictypes.h"
          10                 : #include "base/platform_thread.h"
          11                 :
          12                 : namespace base {
          13                 :
          14            4260 : void LazyInstanceHelper::EnsureInstance(void* instance,
          15                 :                                         void (*ctor)(void*),
          16                 :                                         void (*dtor)(void*)) {
          17                 :   // Try to create the instance, if we're the first, will go from EMPTY
          18                 :   // to CREATING, otherwise we've already been beaten here.
          19            4260 :   if (base::subtle::Acquire_CompareAndSwap(
          20            4260 :           &state_, STATE_EMPTY, STATE_CREATING) == STATE_EMPTY) {
          21                 :     // Created the instance in the space provided by |instance|.
          22            4260 :     ctor(instance);
          23                 :     // Instance is created, go from CREATING to CREATED.
          24            4260 :     base::subtle::Release_Store(&state_, STATE_CREATED);
          25                 :     // Register the destructor callback with AtExitManager.
          26            4260 :     base::AtExitManager::RegisterCallback(dtor, instance);
          27                 :   } else {
          28                 :     // It's either in the process of being created, or already created.  Spin.
          29               0 :     while (base::subtle::NoBarrier_Load(&state_) != STATE_CREATED)
          30               0 :       PlatformThread::YieldCurrentThread();
          31                 :   }
          32            4260 : }
          33                 :
          34                 : }  // namespace base

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