gecko-dev/media/mtransport/runnable_utils.h

99 lines
3.0 KiB
C++

/* -*- 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 "nsThreadUtils.h"
#include "mozilla/RefPtr.h"
// 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)
{
nsCOMPtr<nsIRunnable> runnable_ref(runnable);
if (thread) {
bool on;
nsresult rv;
rv = thread->IsOnCurrentThread(&on);
// If the target thread has already shut down, we don't want to assert.
if (rv != NS_ERROR_NOT_INITIALIZED) {
MOZ_ASSERT(NS_SUCCEEDED(rv));
}
NS_ENSURE_SUCCESS(rv, rv);
if (!on) {
return thread->Dispatch(runnable_ref, flags);
}
}
return runnable_ref->Run();
}
template<RunnableResult result>
class runnable_args_base : public nsRunnable {
public:
NS_IMETHOD Run() = 0;
};
}
// The generated file contains four major function templates
// (in variants for arbitrary numbers of arguments up to 10,
// which is why it is machine generated). The four templates
// are:
//
// WrapRunnable(o, m, ...) -- wraps a member function m of an object ptr o
// WrapRunnableRet(o, m, ..., r) -- wraps a member function m of an object ptr o
// the function returns something that can
// be assigned to *r
// WrapRunnableNM(f, ...) -- wraps a function f
// WrapRunnableNMRet(f, ..., r) -- wraps a function f that returns something
// that can be assigned to *r
//
// All of these template functions return a Runnable* which can be passed
// to Dispatch().
#include "runnable_utils_generated.h"
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 detail::RunOnThreadInternal(thread, static_cast<nsIRunnable *>(runnable), NS_DISPATCH_SYNC);
}
#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
} /* namespace mozilla */
#endif