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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
// Original author: ekr@rtfm.com
#ifndef runnable_utils_h__
#define runnable_utils_h__
#include <utility>
#include "mozilla/RefPtr.h"
#include "nsThreadUtils.h"
#include <functional>
#include <tuple>
#include <type_traits>
// Abstract base class for all of our templates
namespace mozilla {
namespace detail {
enum RunnableResult { NoResult, ReturnsResult };
static inline nsresult RunOnThreadInternal(nsIEventTarget* thread,
nsIRunnable* runnable,
uint32_t flags) {
return thread->Dispatch(runnable, flags);
}
template <RunnableResult result>
class runnable_args_base : public Runnable {
public:
runnable_args_base() : Runnable("media-runnable_args_base") {}
NS_IMETHOD Run() final {
MOZ_ASSERT(!mHasRun, "Can only be run once");
RunInternal();
#ifdef DEBUG
mHasRun = true;
#endif
return NS_OK;
}
protected:
virtual void RunInternal() = 0;
#ifdef DEBUG
bool mHasRun = false;
#endif
};
} // namespace detail
template <typename FunType, typename... Args>
class runnable_args_func : public detail::runnable_args_base<detail::NoResult> {
public:
// |explicit| to pacify static analysis when there are no |args|.
template <typename... Arguments>
explicit runnable_args_func(FunType f, Arguments&&... args)
: mFunc(f), mArgs(std::forward<Arguments>(args)...) {}
protected:
void RunInternal() override {
std::apply(std::move(mFunc), std::move(mArgs));
}
private:
FunType mFunc;
std::tuple<Args...> mArgs;
};
template <typename FunType, typename... Args>
runnable_args_func<FunType, std::decay_t<Args>...>* WrapRunnableNM(
FunType f, Args&&... args) {
return new runnable_args_func<FunType, std::decay_t<Args>...>(
f, std::forward<Args>(args)...);
}
template <typename Ret, typename FunType, typename... Args>
class runnable_args_func_ret
: public detail::runnable_args_base<detail::ReturnsResult> {
public:
template <typename... Arguments>
runnable_args_func_ret(Ret* ret, FunType f, Arguments&&... args)
: mReturn(ret), mFunc(f), mArgs(std::forward<Arguments>(args)...) {}
protected:
void RunInternal() override {
*mReturn = std::apply(std::move(mFunc), std::move(mArgs));
}
private:
Ret* mReturn;
FunType mFunc;
std::tuple<Args...> mArgs;
};
template <typename R, typename FunType, typename... Args>
runnable_args_func_ret<R, FunType, std::decay_t<Args>...>* WrapRunnableNMRet(
R* ret, FunType f, Args&&... args) {
return new runnable_args_func_ret<R, FunType, std::decay_t<Args>...>(
ret, f, std::forward<Args>(args)...);
}
template <typename Class, typename M, typename... Args>
class runnable_args_memfn
: public detail::runnable_args_base<detail::NoResult> {
public:
template <typename... Arguments>
runnable_args_memfn(Class&& obj, M method, Arguments&&... args)
: mObj(std::forward<Class>(obj)),
mMethod(method),
mArgs(std::forward<Arguments>(args)...) {}
protected:
void RunInternal() override {
std::apply(std::mem_fn(mMethod),
std::tuple_cat(std::tie(mObj), std::move(mArgs)));
}
private:
// For holders such as RefPtr and UniquePtr make sure concrete copy is held
// rather than a potential dangling reference.
std::decay_t<Class> mObj;
M mMethod;
std::tuple<Args...> mArgs;
};
template <typename Class, typename M, typename... Args>
runnable_args_memfn<Class, M, std::decay_t<Args>...>* WrapRunnable(
Class&& obj, M method, Args&&... args) {
return new runnable_args_memfn<Class, M, std::decay_t<Args>...>(
std::forward<Class>(obj), method, std::forward<Args>(args)...);
}
template <typename Ret, typename Class, typename M, typename... Args>
class runnable_args_memfn_ret
: public detail::runnable_args_base<detail::ReturnsResult> {
public:
template <typename... Arguments>
runnable_args_memfn_ret(Ret* ret, Class&& obj, M method, Arguments... args)
: mReturn(ret),
mObj(std::forward<Class>(obj)),
mMethod(method),
mArgs(std::forward<Arguments>(args)...) {}
protected:
void RunInternal() override {
*mReturn = std::apply(std::mem_fn(mMethod),
std::tuple_cat(std::tie(mObj), std::move(mArgs)));
}
private:
Ret* mReturn;
// For holders such as RefPtr and UniquePtr make sure concrete copy is held
// rather than a potential dangling reference.
std::decay_t<Class> mObj;
M mMethod;
std::tuple<Args...> mArgs;
};
template <typename R, typename Class, typename M, typename... Args>
runnable_args_memfn_ret<R, Class, M, std::decay_t<Args>...>* WrapRunnableRet(
R* ret, Class&& obj, M method, Args&&... args) {
return new runnable_args_memfn_ret<R, Class, M, std::decay_t<Args>...>(
ret, std::forward<Class>(obj), method, std::forward<Args>(args)...);
}
static inline nsresult RUN_ON_THREAD(
nsIEventTarget* thread,
detail::runnable_args_base<detail::NoResult>* runnable, uint32_t flags) {
return detail::RunOnThreadInternal(
thread, static_cast<nsIRunnable*>(runnable), flags);
}
static inline nsresult RUN_ON_THREAD(
nsIEventTarget* thread,
detail::runnable_args_base<detail::ReturnsResult>* runnable) {
return NS_DispatchAndSpinEventLoopUntilComplete(
"webrtc RUN_ON_THREAD"_ns, thread,
do_AddRef(static_cast<nsIRunnable*>(runnable)));
}
#ifdef DEBUG
# define ASSERT_ON_THREAD(t) \
do { \
if (t) { \
bool on; \
nsresult rv; \
rv = t->IsOnCurrentThread(&on); \
MOZ_ASSERT(NS_SUCCEEDED(rv)); \
MOZ_ASSERT(on); \
} \
} while (0)
#else
# define ASSERT_ON_THREAD(t)
#endif
template <class T>
class DispatchedRelease : public detail::runnable_args_base<detail::NoResult> {
public:
explicit DispatchedRelease(already_AddRefed<T>& ref) : ref_(ref) {}
protected:
void RunInternal() override { ref_ = nullptr; }
private:
RefPtr<T> ref_;
};
template <typename T>
DispatchedRelease<T>* WrapRelease(already_AddRefed<T>&& ref) {
return new DispatchedRelease<T>(ref);
}
} /* namespace mozilla */
#endif
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