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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_CPP_CORE_H_
#define PPAPI_CPP_CORE_H_
#include "ppapi/c/ppb_core.h"
/// @file
/// This file defines APIs related to memory management, time, and threads.
namespace pp {
class CompletionCallback;
class Module;
/// APIs related to memory management, time, and threads.
class Core {
public:
// Note that we explicitly don't expose Resource& versions of this function
// since Resource will normally manage the refcount properly. These should
// be called only when doing manual management on raw PP_Resource handles,
// which should be fairly rare.
/// AddRefResource() increments the reference count for the provided
/// <code>resource</code>.
///
/// @param[in] resource A <code>PP_Resource</code> corresponding to a
/// resource.
void AddRefResource(PP_Resource resource) {
interface_->AddRefResource(resource);
}
/// ReleaseResource() decrements the reference count for the provided
/// <code>resource</code>. The resource will be deallocated if the
/// reference count reaches zero.
///
/// @param[in] resource A <code>PP_Resource</code> corresponding to a
/// resource.
void ReleaseResource(PP_Resource resource) {
interface_->ReleaseResource(resource);
}
/// GetTime() returns the "wall clock time" according to the
/// browser.
///
/// @return A <code>PP_Time</code> containing the "wall clock time" according
/// to the browser.
PP_Time GetTime() {
return interface_->GetTime();
}
/// GetTimeTicks() returns the "tick time" according to the browser.
/// This clock is used by the browser when passing some event times to the
/// module (for example, using the
/// <code>PP_InputEvent::time_stamp_seconds</code> field). It is not
/// correlated to any actual wall clock time (like GetTime()). Because
/// of this, it will not change if the user changes their computer clock.
///
/// @return A <code>PP_TimeTicks</code> containing the "tick time" according
/// to the browser.
PP_TimeTicks GetTimeTicks() {
return interface_->GetTimeTicks();
}
/// CallOnMainThread() schedules work to be executed on the main pepper
/// thread after the specified delay. The delay may be 0 to specify a call
/// back as soon as possible.
///
/// The |result| parameter will just be passed as the second argument to the
/// callback. Many applications won't need this, but it allows a module to
/// emulate calls of some callbacks which do use this value.
///
/// <strong>Note:</strong> CallOnMainThread(), even when used from the main
/// thread with a delay of 0 milliseconds, will never directly invoke the
/// callback. Even in this case, the callback will be scheduled
/// asynchronously.
///
/// <strong>Note:</strong> If the browser is shutting down or if the module
/// has no instances, then the callback function may not be called.
///
/// @param[in] delay_in_milliseconds An int32_t delay in milliseconds.
/// @param[in] callback A <code>CompletionCallback</code> callback function
/// that the browser will call after the specified delay.
/// @param[in] result An int32_t that the browser will pass to the given
/// <code>CompletionCallback</code>.
void CallOnMainThread(int32_t delay_in_milliseconds,
const CompletionCallback& callback,
int32_t result = 0);
/// IsMainThread() returns true if the current thread is the main pepper
/// thread.
///
/// This function is useful for implementing sanity checks, and deciding if
/// dispatching using CallOnMainThread() is required.
///
/// @return true if the current thread is the main pepper thread, otherwise
/// false.
bool IsMainThread();
private:
// Allow Module to construct.
friend class Module;
// Only module should make this class so this constructor is private.
Core(const PPB_Core* inter) : interface_(inter) {}
// Copy and assignment are disallowed.
Core(const Core& other);
Core& operator=(const Core& other);
const PPB_Core* interface_;
};
} // namespace pp
#endif // PPAPI_CPP_CORE_H_
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