mirror of
https://github.com/mozilla/gecko-dev.git
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357 lines
8.7 KiB
C++
357 lines
8.7 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "CacheIOThread.h"
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#include "CacheFileIOManager.h"
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#include "nsIRunnable.h"
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#include "nsISupportsImpl.h"
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#include "nsPrintfCString.h"
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#include "nsThreadUtils.h"
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#include "mozilla/IOInterposer.h"
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#include "mozilla/VisualEventTracer.h"
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namespace mozilla {
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namespace net {
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CacheIOThread* CacheIOThread::sSelf = nullptr;
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NS_IMPL_ISUPPORTS(CacheIOThread, nsIThreadObserver)
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CacheIOThread::CacheIOThread()
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: mMonitor("CacheIOThread")
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, mThread(nullptr)
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, mLowestLevelWaiting(LAST_LEVEL)
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, mCurrentlyExecutingLevel(0)
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, mHasXPCOMEvents(false)
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, mRerunCurrentEvent(false)
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, mShutdown(false)
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{
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sSelf = this;
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}
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CacheIOThread::~CacheIOThread()
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{
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sSelf = nullptr;
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#ifdef DEBUG
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for (uint32_t level = 0; level < LAST_LEVEL; ++level) {
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MOZ_ASSERT(!mEventQueue[level].Length());
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}
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#endif
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}
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nsresult CacheIOThread::Init()
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{
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mThread = PR_CreateThread(PR_USER_THREAD, ThreadFunc, this,
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PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD,
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PR_JOINABLE_THREAD, 128 * 1024);
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if (!mThread)
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return NS_ERROR_FAILURE;
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return NS_OK;
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}
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nsresult CacheIOThread::Dispatch(nsIRunnable* aRunnable, uint32_t aLevel)
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{
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NS_ENSURE_ARG(aLevel < LAST_LEVEL);
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// Runnable is always expected to be non-null, hard null-check bellow.
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MOZ_ASSERT(aRunnable);
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MonitorAutoLock lock(mMonitor);
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if (mShutdown && (PR_GetCurrentThread() != mThread))
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return NS_ERROR_UNEXPECTED;
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return DispatchInternal(aRunnable, aLevel);
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}
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nsresult CacheIOThread::DispatchAfterPendingOpens(nsIRunnable* aRunnable)
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{
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// Runnable is always expected to be non-null, hard null-check bellow.
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MOZ_ASSERT(aRunnable);
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MonitorAutoLock lock(mMonitor);
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if (mShutdown && (PR_GetCurrentThread() != mThread))
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return NS_ERROR_UNEXPECTED;
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// Move everything from later executed OPEN level to the OPEN_PRIORITY level
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// where we post the (eviction) runnable.
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mEventQueue[OPEN_PRIORITY].AppendElements(mEventQueue[OPEN]);
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mEventQueue[OPEN].Clear();
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return DispatchInternal(aRunnable, OPEN_PRIORITY);
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}
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nsresult CacheIOThread::DispatchInternal(nsIRunnable* aRunnable, uint32_t aLevel)
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{
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if (NS_WARN_IF(!aRunnable))
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return NS_ERROR_NULL_POINTER;
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mMonitor.AssertCurrentThreadOwns();
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mEventQueue[aLevel].AppendElement(aRunnable);
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if (mLowestLevelWaiting > aLevel)
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mLowestLevelWaiting = aLevel;
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mMonitor.NotifyAll();
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return NS_OK;
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}
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bool CacheIOThread::IsCurrentThread()
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{
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return mThread == PR_GetCurrentThread();
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}
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bool CacheIOThread::YieldInternal()
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{
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if (!IsCurrentThread()) {
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NS_WARNING("Trying to yield to priority events on non-cache2 I/O thread? "
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"You probably do something wrong.");
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return false;
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}
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if (mCurrentlyExecutingLevel == XPCOM_LEVEL) {
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// Doesn't make any sense, since this handler is the one
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// that would be executed as the next one.
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return false;
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}
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if (!EventsPending(mCurrentlyExecutingLevel))
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return false;
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mRerunCurrentEvent = true;
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return true;
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}
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nsresult CacheIOThread::Shutdown()
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{
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{
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MonitorAutoLock lock(mMonitor);
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mShutdown = true;
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mMonitor.NotifyAll();
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}
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PR_JoinThread(mThread);
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mThread = nullptr;
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return NS_OK;
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}
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already_AddRefed<nsIEventTarget> CacheIOThread::Target()
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{
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nsCOMPtr<nsIEventTarget> target;
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target = mXPCOMThread;
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if (!target && mThread)
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{
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MonitorAutoLock lock(mMonitor);
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if (!mXPCOMThread)
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lock.Wait();
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target = mXPCOMThread;
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}
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return target.forget();
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}
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// static
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void CacheIOThread::ThreadFunc(void* aClosure)
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{
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PR_SetCurrentThreadName("Cache2 I/O");
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mozilla::IOInterposer::RegisterCurrentThread();
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CacheIOThread* thread = static_cast<CacheIOThread*>(aClosure);
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thread->ThreadFunc();
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mozilla::IOInterposer::UnregisterCurrentThread();
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}
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void CacheIOThread::ThreadFunc()
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{
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nsCOMPtr<nsIThreadInternal> threadInternal;
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{
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MonitorAutoLock lock(mMonitor);
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// This creates nsThread for this PRThread
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nsCOMPtr<nsIThread> xpcomThread = NS_GetCurrentThread();
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threadInternal = do_QueryInterface(xpcomThread);
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if (threadInternal)
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threadInternal->SetObserver(this);
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mXPCOMThread.swap(xpcomThread);
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lock.NotifyAll();
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do {
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loopStart:
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// Reset the lowest level now, so that we can detect a new event on
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// a lower level (i.e. higher priority) has been scheduled while
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// executing any previously scheduled event.
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mLowestLevelWaiting = LAST_LEVEL;
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// Process xpcom events first
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while (mHasXPCOMEvents) {
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eventtracer::AutoEventTracer tracer(this, eventtracer::eExec, eventtracer::eDone,
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"net::cache::io::level(xpcom)");
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mHasXPCOMEvents = false;
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mCurrentlyExecutingLevel = XPCOM_LEVEL;
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MonitorAutoUnlock unlock(mMonitor);
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bool processedEvent;
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nsresult rv;
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do {
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rv = mXPCOMThread->ProcessNextEvent(false, &processedEvent);
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} while (NS_SUCCEEDED(rv) && processedEvent);
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}
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uint32_t level;
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for (level = 0; level < LAST_LEVEL; ++level) {
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if (!mEventQueue[level].Length()) {
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// no events on this level, go to the next level
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continue;
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}
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LoopOneLevel(level);
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// Go to the first (lowest) level again
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goto loopStart;
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}
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if (EventsPending())
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continue;
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if (mShutdown)
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break;
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lock.Wait(PR_INTERVAL_NO_TIMEOUT);
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if (EventsPending())
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continue;
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} while (true);
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MOZ_ASSERT(!EventsPending());
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} // lock
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if (threadInternal)
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threadInternal->SetObserver(nullptr);
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}
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static const char* const sLevelTraceName[] = {
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"net::cache::io::level(0)",
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"net::cache::io::level(1)",
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"net::cache::io::level(2)",
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"net::cache::io::level(3)",
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"net::cache::io::level(4)",
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"net::cache::io::level(5)",
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"net::cache::io::level(6)",
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"net::cache::io::level(7)",
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"net::cache::io::level(8)",
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"net::cache::io::level(9)",
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"net::cache::io::level(10)",
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"net::cache::io::level(11)",
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"net::cache::io::level(12)"
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};
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void CacheIOThread::LoopOneLevel(uint32_t aLevel)
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{
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eventtracer::AutoEventTracer tracer(this, eventtracer::eExec, eventtracer::eDone,
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sLevelTraceName[aLevel]);
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nsTArray<nsRefPtr<nsIRunnable> > events;
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events.SwapElements(mEventQueue[aLevel]);
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uint32_t length = events.Length();
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mCurrentlyExecutingLevel = aLevel;
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bool returnEvents = false;
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uint32_t index;
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{
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MonitorAutoUnlock unlock(mMonitor);
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for (index = 0; index < length; ++index) {
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if (EventsPending(aLevel)) {
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// Somebody scheduled a new event on a lower level, break and harry
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// to execute it! Don't forget to return what we haven't exec.
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returnEvents = true;
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break;
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}
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// Drop any previous flagging, only an event on the current level may set
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// this flag.
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mRerunCurrentEvent = false;
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events[index]->Run();
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if (mRerunCurrentEvent) {
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// The event handler yields to higher priority events and wants to rerun.
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returnEvents = true;
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break;
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}
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// Release outside the lock.
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events[index] = nullptr;
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}
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}
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if (returnEvents)
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mEventQueue[aLevel].InsertElementsAt(0, events.Elements() + index, length - index);
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}
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bool CacheIOThread::EventsPending(uint32_t aLastLevel)
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{
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return mLowestLevelWaiting < aLastLevel || mHasXPCOMEvents;
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}
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NS_IMETHODIMP CacheIOThread::OnDispatchedEvent(nsIThreadInternal *thread)
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{
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MonitorAutoLock lock(mMonitor);
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mHasXPCOMEvents = true;
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MOZ_ASSERT(!mShutdown || (PR_GetCurrentThread() == mThread));
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lock.Notify();
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return NS_OK;
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}
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NS_IMETHODIMP CacheIOThread::OnProcessNextEvent(nsIThreadInternal *thread, bool mayWait, uint32_t recursionDepth)
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{
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return NS_OK;
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}
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NS_IMETHODIMP CacheIOThread::AfterProcessNextEvent(nsIThreadInternal *thread, uint32_t recursionDepth,
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bool eventWasProcessed)
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{
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return NS_OK;
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}
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// Memory reporting
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size_t CacheIOThread::SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const
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{
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MonitorAutoLock lock(const_cast<CacheIOThread*>(this)->mMonitor);
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size_t n = 0;
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n += mallocSizeOf(mThread);
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for (uint32_t level = 0; level < LAST_LEVEL; ++level) {
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n += mEventQueue[level].SizeOfExcludingThis(mallocSizeOf);
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// Events referenced by the queues are arbitrary objects we cannot be sure
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// are reported elsewhere as well as probably not implementing nsISizeOf
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// interface. Deliberatly omitting them from reporting here.
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}
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return n;
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}
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size_t CacheIOThread::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
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{
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return mallocSizeOf(this) + SizeOfExcludingThis(mallocSizeOf);
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}
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} // net
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} // mozilla
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