gecko-dev/xpcom/glue/nsThreadUtils.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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/. */
#include "nsThreadUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/Likely.h"
#ifdef MOZILLA_INTERNAL_API
# include "nsThreadManager.h"
#else
# include "nsXPCOMCIDInternal.h"
# include "nsIThreadManager.h"
# include "nsServiceManagerUtils.h"
#endif
#ifdef XP_WIN
#include <windows.h>
#include "mozilla/WindowsVersion.h"
using mozilla::IsVistaOrLater;
#elif defined(XP_MACOSX)
#include <sys/resource.h>
#endif
#include <pratom.h>
#include <prthread.h>
#ifndef XPCOM_GLUE_AVOID_NSPR
NS_IMPL_ISUPPORTS(nsRunnable, nsIRunnable)
NS_IMETHODIMP
nsRunnable::Run()
{
// Do nothing
return NS_OK;
}
NS_IMPL_ISUPPORTS(nsCancelableRunnable, nsICancelableRunnable,
nsIRunnable)
NS_IMETHODIMP
nsCancelableRunnable::Run()
{
// Do nothing
return NS_OK;
}
NS_IMETHODIMP
nsCancelableRunnable::Cancel()
{
// Do nothing
return NS_OK;
}
#endif // XPCOM_GLUE_AVOID_NSPR
//-----------------------------------------------------------------------------
NS_METHOD
NS_NewThread(nsIThread **result, nsIRunnable *event, uint32_t stackSize)
{
nsCOMPtr<nsIThread> thread;
#ifdef MOZILLA_INTERNAL_API
nsresult rv = nsThreadManager::get()->
nsThreadManager::NewThread(0, stackSize, getter_AddRefs(thread));
#else
nsresult rv;
nsCOMPtr<nsIThreadManager> mgr =
do_GetService(NS_THREADMANAGER_CONTRACTID, &rv);
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
rv = mgr->NewThread(0, stackSize, getter_AddRefs(thread));
#endif
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
if (event) {
rv = thread->Dispatch(event, NS_DISPATCH_NORMAL);
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
}
*result = nullptr;
thread.swap(*result);
return NS_OK;
}
NS_METHOD
NS_GetCurrentThread(nsIThread **result)
{
#ifdef MOZILLA_INTERNAL_API
return nsThreadManager::get()->nsThreadManager::GetCurrentThread(result);
#else
nsresult rv;
nsCOMPtr<nsIThreadManager> mgr =
do_GetService(NS_THREADMANAGER_CONTRACTID, &rv);
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
return mgr->GetCurrentThread(result);
#endif
}
NS_METHOD
NS_GetMainThread(nsIThread **result)
{
#ifdef MOZILLA_INTERNAL_API
return nsThreadManager::get()->nsThreadManager::GetMainThread(result);
#else
nsresult rv;
nsCOMPtr<nsIThreadManager> mgr =
do_GetService(NS_THREADMANAGER_CONTRACTID, &rv);
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
return mgr->GetMainThread(result);
#endif
}
#if defined(MOZILLA_INTERNAL_API) && defined(XP_WIN)
extern DWORD gTLSThreadIDIndex;
bool
NS_IsMainThread()
{
return TlsGetValue(gTLSThreadIDIndex) == (void*) mozilla::threads::Main;
}
#elif defined(MOZILLA_INTERNAL_API) && defined(NS_TLS)
#ifdef MOZ_ASAN
// Temporary workaround, see bug 895845
bool NS_IsMainThread()
{
return gTLSThreadID == mozilla::threads::Main;
}
#else
// NS_IsMainThread() is defined inline in MainThreadUtils.h
#endif
#else
#ifdef MOZILLA_INTERNAL_API
bool NS_IsMainThread()
{
bool result = false;
nsThreadManager::get()->nsThreadManager::GetIsMainThread(&result);
return bool(result);
}
#else
bool NS_IsMainThread()
{
bool result = false;
nsCOMPtr<nsIThreadManager> mgr =
do_GetService(NS_THREADMANAGER_CONTRACTID);
if (mgr)
mgr->GetIsMainThread(&result);
return bool(result);
}
#endif
#endif
NS_METHOD
NS_DispatchToCurrentThread(nsIRunnable *event)
{
#ifdef MOZILLA_INTERNAL_API
nsIThread *thread = NS_GetCurrentThread();
if (!thread) { return NS_ERROR_UNEXPECTED; }
#else
nsCOMPtr<nsIThread> thread;
nsresult rv = NS_GetCurrentThread(getter_AddRefs(thread));
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
#endif
return thread->Dispatch(event, NS_DISPATCH_NORMAL);
}
NS_METHOD
NS_DispatchToMainThread(nsIRunnable *event, uint32_t dispatchFlags)
{
nsCOMPtr<nsIThread> thread;
nsresult rv = NS_GetMainThread(getter_AddRefs(thread));
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
return thread->Dispatch(event, dispatchFlags);
}
#ifndef XPCOM_GLUE_AVOID_NSPR
NS_METHOD
NS_ProcessPendingEvents(nsIThread *thread, PRIntervalTime timeout)
{
nsresult rv = NS_OK;
#ifdef MOZILLA_INTERNAL_API
if (!thread) {
thread = NS_GetCurrentThread();
if (NS_WARN_IF(!thread))
return NS_ERROR_UNEXPECTED;
}
#else
nsCOMPtr<nsIThread> current;
if (!thread) {
rv = NS_GetCurrentThread(getter_AddRefs(current));
if (NS_WARN_IF(NS_FAILED(rv)))
return rv;
thread = current.get();
}
#endif
PRIntervalTime start = PR_IntervalNow();
for (;;) {
bool processedEvent;
rv = thread->ProcessNextEvent(false, &processedEvent);
if (NS_FAILED(rv) || !processedEvent)
break;
if (PR_IntervalNow() - start > timeout)
break;
}
return rv;
}
#endif // XPCOM_GLUE_AVOID_NSPR
inline bool
hasPendingEvents(nsIThread *thread)
{
bool val;
return NS_SUCCEEDED(thread->HasPendingEvents(&val)) && val;
}
bool
NS_HasPendingEvents(nsIThread *thread)
{
if (!thread) {
#ifndef MOZILLA_INTERNAL_API
nsCOMPtr<nsIThread> current;
NS_GetCurrentThread(getter_AddRefs(current));
return hasPendingEvents(current);
#else
thread = NS_GetCurrentThread();
if (NS_WARN_IF(!thread))
return false;
#endif
}
return hasPendingEvents(thread);
}
bool
NS_ProcessNextEvent(nsIThread *thread, bool mayWait)
{
#ifdef MOZILLA_INTERNAL_API
if (!thread) {
thread = NS_GetCurrentThread();
if (NS_WARN_IF(!thread))
return false;
}
#else
nsCOMPtr<nsIThread> current;
if (!thread) {
NS_GetCurrentThread(getter_AddRefs(current));
if (NS_WARN_IF(!current))
return false;
thread = current.get();
}
#endif
bool val;
return NS_SUCCEEDED(thread->ProcessNextEvent(mayWait, &val)) && val;
}
#ifndef XPCOM_GLUE_AVOID_NSPR
namespace {
class nsNameThreadRunnable MOZ_FINAL : public nsIRunnable
{
public:
nsNameThreadRunnable(const nsACString &name) : mName(name) { }
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIRUNNABLE
protected:
const nsCString mName;
};
NS_IMPL_ISUPPORTS(nsNameThreadRunnable, nsIRunnable)
NS_IMETHODIMP
nsNameThreadRunnable::Run()
{
PR_SetCurrentThreadName(mName.BeginReading());
return NS_OK;
}
} // anonymous namespace
void
NS_SetThreadName(nsIThread *thread, const nsACString &name)
{
if (!thread)
return;
thread->Dispatch(new nsNameThreadRunnable(name),
nsIEventTarget::DISPATCH_NORMAL);
}
#else // !XPCOM_GLUE_AVOID_NSPR
void
NS_SetThreadName(nsIThread *thread, const nsACString &name)
{
// No NSPR, no love.
}
#endif
#ifdef MOZILLA_INTERNAL_API
nsIThread *
NS_GetCurrentThread() {
return nsThreadManager::get()->GetCurrentThread();
}
#endif
// nsThreadPoolNaming
void
nsThreadPoolNaming::SetThreadPoolName(const nsACString & aPoolName,
nsIThread * aThread)
{
nsCString name(aPoolName);
name.AppendLiteral(" #");
name.AppendInt(++mCounter, 10); // The counter is declared as volatile
if (aThread) {
// Set on the target thread
NS_SetThreadName(aThread, name);
}
else {
// Set on the current thread
PR_SetCurrentThreadName(name.BeginReading());
}
}
// nsAutoLowPriorityIO
nsAutoLowPriorityIO::nsAutoLowPriorityIO()
{
#if defined(XP_WIN)
lowIOPrioritySet = IsVistaOrLater() &&
SetThreadPriority(GetCurrentThread(),
THREAD_MODE_BACKGROUND_BEGIN);
#elif defined(XP_MACOSX)
oldPriority = getiopolicy_np(IOPOL_TYPE_DISK, IOPOL_SCOPE_THREAD);
lowIOPrioritySet = oldPriority != -1 &&
setiopolicy_np(IOPOL_TYPE_DISK,
IOPOL_SCOPE_THREAD,
IOPOL_THROTTLE) != -1;
#else
lowIOPrioritySet = false;
#endif
}
nsAutoLowPriorityIO::~nsAutoLowPriorityIO()
{
#if defined(XP_WIN)
if (MOZ_LIKELY(lowIOPrioritySet)) {
// On Windows the old thread priority is automatically restored
SetThreadPriority(GetCurrentThread(), THREAD_MODE_BACKGROUND_END);
}
#elif defined(XP_MACOSX)
if (MOZ_LIKELY(lowIOPrioritySet)) {
setiopolicy_np(IOPOL_TYPE_DISK, IOPOL_SCOPE_THREAD, oldPriority);
}
#endif
}