1 // Copyright (c) 2011 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 #ifndef PPAPI_CPP_CORE_H_ 6 #define PPAPI_CPP_CORE_H_ 7 8 #include "ppapi/c/ppb_core.h" 9 10 /// @file 11 /// This file defines APIs related to memory management, time, and threads. 12 13 namespace pp { 14 15 class CompletionCallback; 16 class Module; 17 18 /// APIs related to memory management, time, and threads. 19 class Core { 20 public: 21 // Note that we explicitly don't expose Resource& versions of this function 22 // since Resource will normally manage the refcount properly. These should 23 // be called only when doing manual management on raw PP_Resource handles, 24 // which should be fairly rare. 25 26 /// AddRefResource() increments the reference count for the provided 27 /// <code>resource</code>. 28 /// 29 /// @param[in] resource A <code>PP_Resource</code> corresponding to a 30 /// resource. 31 void AddRefResource(PP_Resource resource) { 32 interface_->AddRefResource(resource); 33 } 34 35 /// ReleaseResource() decrements the reference count for the provided 36 /// <code>resource</code>. The resource will be deallocated if the 37 /// reference count reaches zero. 38 /// 39 /// @param[in] resource A <code>PP_Resource</code> corresponding to a 40 /// resource. 41 void ReleaseResource(PP_Resource resource) { 42 interface_->ReleaseResource(resource); 43 } 44 45 /// GetTime() returns the "wall clock time" according to the 46 /// browser. 47 /// 48 /// @return A <code>PP_Time</code> containing the "wall clock time" according 49 /// to the browser. 50 PP_Time GetTime() { 51 return interface_->GetTime(); 52 } 53 54 /// GetTimeTicks() returns the "tick time" according to the browser. 55 /// This clock is used by the browser when passing some event times to the 56 /// module (for example, using the 57 /// <code>PP_InputEvent::time_stamp_seconds</code> field). It is not 58 /// correlated to any actual wall clock time (like GetTime()). Because 59 /// of this, it will not change if the user changes their computer clock. 60 /// 61 /// @return A <code>PP_TimeTicks</code> containing the "tick time" according 62 /// to the browser. 63 PP_TimeTicks GetTimeTicks() { 64 return interface_->GetTimeTicks(); 65 } 66 67 /// CallOnMainThread() schedules work to be executed on the main pepper 68 /// thread after the specified delay. The delay may be 0 to specify a call 69 /// back as soon as possible. 70 /// 71 /// The |result| parameter will just be passed as the second argument to the 72 /// callback. Many applications won't need this, but it allows a module to 73 /// emulate calls of some callbacks which do use this value. 74 /// 75 /// <strong>Note:</strong> CallOnMainThread(), even when used from the main 76 /// thread with a delay of 0 milliseconds, will never directly invoke the 77 /// callback. Even in this case, the callback will be scheduled 78 /// asynchronously. 79 /// 80 /// <strong>Note:</strong> If the browser is shutting down or if the module 81 /// has no instances, then the callback function may not be called. 82 /// 83 /// @param[in] delay_in_milliseconds An int32_t delay in milliseconds. 84 /// @param[in] callback A <code>CompletionCallback</code> callback function 85 /// that the browser will call after the specified delay. 86 /// @param[in] result An int32_t that the browser will pass to the given 87 /// <code>CompletionCallback</code>. 88 void CallOnMainThread(int32_t delay_in_milliseconds, 89 const CompletionCallback& callback, 90 int32_t result = 0); 91 92 93 /// IsMainThread() returns true if the current thread is the main pepper 94 /// thread. 95 /// 96 /// This function is useful for implementing sanity checks, and deciding if 97 /// dispatching using CallOnMainThread() is required. 98 /// 99 /// @return true if the current thread is the main pepper thread, otherwise 100 /// false. 101 bool IsMainThread(); 102 103 private: 104 // Allow Module to construct. 105 friend class Module; 106 107 // Only module should make this class so this constructor is private. 108 Core(const PPB_Core* inter) : interface_(inter) {} 109 110 // Copy and assignment are disallowed. 111 Core(const Core& other); 112 Core& operator=(const Core& other); 113 114 const PPB_Core* interface_; 115 }; 116 117 } // namespace pp 118 119 #endif // PPAPI_CPP_CORE_H_ 120
