1 // Copyright 2010-2018, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 #ifndef MOZC_BASE_PEPPER_SCOPED_OBJ_H_ 31 #define MOZC_BASE_PEPPER_SCOPED_OBJ_H_ 32 33 #ifdef OS_NACL 34 35 #include <ppapi/utility/completion_callback_factory.h> 36 37 #include "base/port.h" 38 #include "base/unnamed_event.h" 39 40 namespace mozc { 41 42 // Some Pepper classes have to be deleted in the NaCl main thread. 43 // scoped_main_thread_destructed_object template guarantees that the object will 44 // be deleted in the NaCl main thread. 45 template <class C> 46 class scoped_main_thread_destructed_object { 47 public: 48 typedef C element_type; 49 ptr_(p)50 explicit scoped_main_thread_destructed_object(C *p = NULL) : ptr_(p) { 51 cc_factory_.Initialize(this); 52 } 53 ~scoped_main_thread_destructed_object()54 ~scoped_main_thread_destructed_object() { 55 if (ptr_ != NULL) { 56 DeleteObject(); 57 } 58 } 59 60 void reset(C *p = NULL) { 61 if (p != ptr_) { 62 if (ptr_ != NULL) { 63 DeleteObject(); 64 } 65 ptr_ = p; 66 } 67 } 68 69 C &operator*() const { 70 assert(ptr_ != NULL); 71 return *ptr_; 72 } 73 74 C *operator->() const { 75 assert(ptr_ != NULL); 76 return ptr_; 77 } 78 get()79 C *get() const { 80 return ptr_; 81 } 82 83 private: DeleteObject()84 void DeleteObject() { 85 if (!pp::Module::Get()->core()->IsMainThread()) { 86 pp::Module::Get()->core()->CallOnMainThread( 87 0, 88 cc_factory_.NewCallback( 89 &scoped_main_thread_destructed_object::DeleteObjectImpl)); 90 } else { 91 DeleteObjectImpl(PP_OK); 92 } 93 event_.Wait(-1); 94 } 95 DeleteObjectImpl(int32_t result)96 void DeleteObjectImpl(int32_t result) { 97 delete ptr_; 98 event_.Notify(); 99 } 100 101 C *ptr_; 102 UnnamedEvent event_; 103 pp::CompletionCallbackFactory<scoped_main_thread_destructed_object> 104 cc_factory_; 105 DISALLOW_COPY_AND_ASSIGN(scoped_main_thread_destructed_object); 106 }; 107 108 } // namespace mozc 109 110 #endif // OS_NACL 111 112 #endif // MOZC_BASE_PEPPER_SCOPED_OBJ_H_ 113