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      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
     78