ppapi/shared_impl/ppapi_globals.cc

   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.
   4
   5 #include "ppapi/shared_impl/ppapi_globals.h"
   6
   7 #include "base/lazy_instance.h"  // For testing purposes only.
   8 #include "base/logging.h"
   9 #include "base/single_thread_task_runner.h"
  10 #include "base/thread_task_runner_handle.h"
  11 #include "base/threading/thread_local.h"  // For testing purposes only.
  12
  13 namespace ppapi {
  14
  15 namespace {
  16 // Thread-local globals for testing. See SetPpapiGlobalsOnThreadForTest for more
  17 // information.
  18 base::LazyInstance<base::ThreadLocalPointer<PpapiGlobals> >::Leaky
  19     tls_ppapi_globals_for_test = LAZY_INSTANCE_INITIALIZER;
  20 }  // namespace
  21
  22 PpapiGlobals* ppapi_globals = NULL;
  23
  24 PpapiGlobals::PpapiGlobals() {
  25   DCHECK(!ppapi_globals);
  26   ppapi_globals = this;
  27   main_task_runner_ = base::ThreadTaskRunnerHandle::Get();
  28 }
  29
  30 PpapiGlobals::PpapiGlobals(PerThreadForTest) {
  31   DCHECK(!ppapi_globals);
  32   main_task_runner_ = base::ThreadTaskRunnerHandle::Get();
  33 }
  34
  35 PpapiGlobals::~PpapiGlobals() {
  36   DCHECK(ppapi_globals == this || !ppapi_globals);
  37   ppapi_globals = NULL;
  38 }
  39
  40 // Static Getter for the global singleton.
  41 PpapiGlobals* PpapiGlobals::Get() {
  42   if (ppapi_globals)
  43     return ppapi_globals;
  44   // In unit tests, the following might be valid (see
  45   // SetPpapiGlobalsOnThreadForTest). Normally, this will just return NULL.
  46   return GetThreadLocalPointer();
  47 }
  48
  49 // static
  50 void PpapiGlobals::SetPpapiGlobalsOnThreadForTest(PpapiGlobals* ptr) {
  51   // If we're using a per-thread PpapiGlobals, we should not have a global one.
  52   // If we allowed it, it would always over-ride the "test" versions.
  53   DCHECK(!ppapi_globals);
  54   tls_ppapi_globals_for_test.Pointer()->Set(ptr);
  55 }
  56
  57 base::SingleThreadTaskRunner* PpapiGlobals::GetMainThreadMessageLoop() {
  58   return main_task_runner_.get();
  59 }
  60
  61 void PpapiGlobals::ResetMainThreadMessageLoopForTesting() {
  62   main_task_runner_ = base::ThreadTaskRunnerHandle::Get();
  63 }
  64
  65 bool PpapiGlobals::IsHostGlobals() const { return false; }
  66
  67 bool PpapiGlobals::IsPluginGlobals() const { return false; }
  68
  69 void PpapiGlobals::MarkPluginIsActive() {}
  70
  71 // static
  72 PpapiGlobals* PpapiGlobals::GetThreadLocalPointer() {
  73   return tls_ppapi_globals_for_test.Pointer()->Get();
  74 }
  75
  76 }  // namespace ppapi