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