forked from mirrors/gecko-dev
cc5836fbae
NS_SetCurrentThreadName() is added as an alternative to PR_SetCurrentThreadName() inside libxul. The thread names are collected in the form of crash annotation to be processed on socorro. MozReview-Commit-ID: 4RpAWzTuvPs
661 lines
16 KiB
C++
661 lines
16 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 "GeckoProfiler.h"
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#ifdef XP_WIN
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#include <windows.h>
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#endif
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#ifdef MOZ_TASK_TRACER
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#include "GeckoTaskTracer.h"
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#include "TracedTaskCommon.h"
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#endif
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namespace mozilla {
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namespace net {
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namespace { // anon
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class CacheIOTelemetry
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{
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public:
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typedef CacheIOThread::EventQueue::size_type size_type;
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static size_type mMinLengthToReport[CacheIOThread::LAST_LEVEL];
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static void Report(uint32_t aLevel, size_type aLength);
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};
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static CacheIOTelemetry::size_type const kGranularity = 30;
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CacheIOTelemetry::size_type
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CacheIOTelemetry::mMinLengthToReport[CacheIOThread::LAST_LEVEL] = {
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kGranularity, kGranularity, kGranularity, kGranularity,
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kGranularity, kGranularity, kGranularity, kGranularity
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};
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// static
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void CacheIOTelemetry::Report(uint32_t aLevel, CacheIOTelemetry::size_type aLength)
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{
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if (mMinLengthToReport[aLevel] > aLength) {
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return;
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}
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static Telemetry::HistogramID telemetryID[] = {
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Telemetry::HTTP_CACHE_IO_QUEUE_2_OPEN_PRIORITY,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_READ_PRIORITY,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_MANAGEMENT,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_OPEN,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_READ,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_WRITE_PRIORITY,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_WRITE,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_INDEX,
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Telemetry::HTTP_CACHE_IO_QUEUE_2_EVICT
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};
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// Each bucket is a multiply of kGranularity (30, 60, 90..., 300+)
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aLength = (aLength / kGranularity);
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// Next time report only when over the current length + kGranularity
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mMinLengthToReport[aLevel] = (aLength + 1) * kGranularity;
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// 10 is number of buckets we have in each probe
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aLength = std::min<size_type>(aLength, 10);
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Telemetry::Accumulate(telemetryID[aLevel], aLength - 1); // counted from 0
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}
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} // anon
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namespace detail {
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/**
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* Helper class encapsulating platform-specific code to cancel
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* any pending IO operation taking too long. Solely used during
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* shutdown to prevent any IO shutdown hangs.
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* Mainly designed for using Win32 CancelSynchronousIo function.
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*/
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class BlockingIOWatcher
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{
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#ifdef XP_WIN
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typedef BOOL(WINAPI* TCancelSynchronousIo)(HANDLE hThread);
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TCancelSynchronousIo mCancelSynchronousIo;
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// The native handle to the thread
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HANDLE mThread;
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// Event signaling back to the main thread, see NotifyOperationDone.
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HANDLE mEvent;
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#endif
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public:
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// Created and destroyed on the main thread only
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BlockingIOWatcher();
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~BlockingIOWatcher();
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// Called on the IO thread to grab the platform specific
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// reference to it.
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void InitThread();
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// If there is a blocking operation being handled on the IO
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// thread, this is called on the main thread during shutdown.
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// Waits for notification from the IO thread for up to two seconds.
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// If that times out, it attempts to cancel the IO operation.
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void WatchAndCancel(Monitor& aMonitor);
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// Called by the IO thread after each operation has been
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// finished (after each Run() call). This wakes the main
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// thread up and makes WatchAndCancel() early exit and become
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// a no-op.
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void NotifyOperationDone();
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};
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#ifdef XP_WIN
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BlockingIOWatcher::BlockingIOWatcher()
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: mCancelSynchronousIo(NULL)
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, mThread(NULL)
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, mEvent(NULL)
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{
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HMODULE kernel32_dll = GetModuleHandle("kernel32.dll");
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if (!kernel32_dll) {
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return;
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}
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FARPROC ptr = GetProcAddress(kernel32_dll, "CancelSynchronousIo");
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if (!ptr) {
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return;
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}
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mCancelSynchronousIo = reinterpret_cast<TCancelSynchronousIo>(ptr);
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mEvent = ::CreateEvent(NULL, TRUE, FALSE, NULL);
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}
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BlockingIOWatcher::~BlockingIOWatcher()
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{
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if (mEvent) {
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CloseHandle(mEvent);
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}
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if (mThread) {
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CloseHandle(mThread);
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}
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}
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void BlockingIOWatcher::InitThread()
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{
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// GetCurrentThread() only returns a pseudo handle, hence DuplicateHandle
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BOOL result = ::DuplicateHandle(
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GetCurrentProcess(),
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GetCurrentThread(),
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GetCurrentProcess(),
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&mThread,
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0,
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FALSE,
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DUPLICATE_SAME_ACCESS);
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}
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void BlockingIOWatcher::WatchAndCancel(Monitor& aMonitor)
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{
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if (!mEvent) {
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return;
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}
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// Reset before we enter the monitor to raise the chance we catch
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// the currently pending IO op completion.
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::ResetEvent(mEvent);
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HANDLE thread;
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{
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MonitorAutoLock lock(aMonitor);
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thread = mThread;
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if (!thread) {
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return;
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}
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}
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LOG(("Blocking IO operation pending on IO thread, waiting..."));
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// It seems wise to use the I/O lag time as a maximum time to wait
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// for an operation to finish. When that times out and cancelation
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// succeeds, there will be no other IO operation permitted. By default
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// this is two seconds.
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uint32_t maxLag = std::min<uint32_t>(5, CacheObserver::MaxShutdownIOLag()) * 1000;
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DWORD result = ::WaitForSingleObject(mEvent, maxLag);
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if (result == WAIT_TIMEOUT) {
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LOG(("CacheIOThread: Attempting to cancel a long blocking IO operation"));
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BOOL result = mCancelSynchronousIo(thread);
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if (result) {
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LOG((" cancelation signal succeeded"));
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} else {
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DWORD error = GetLastError();
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LOG((" cancelation signal failed with GetLastError=%u", error));
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}
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}
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}
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void BlockingIOWatcher::NotifyOperationDone()
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{
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if (mEvent) {
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::SetEvent(mEvent);
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}
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}
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#else // WIN
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// Stub code only (we don't implement IO cancelation for this platform)
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BlockingIOWatcher::BlockingIOWatcher() { }
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BlockingIOWatcher::~BlockingIOWatcher() { }
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void BlockingIOWatcher::InitThread() { }
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void BlockingIOWatcher::WatchAndCancel(Monitor&) { }
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void BlockingIOWatcher::NotifyOperationDone() { }
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#endif
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} // detail
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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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, mXPCOMThread(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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, mIOCancelableEvents(0)
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#ifdef DEBUG
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, mInsideLoop(true)
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#endif
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{
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for (uint32_t i = 0; i < LAST_LEVEL; ++i) {
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mQueueLength[i] = 0;
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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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if (mXPCOMThread) {
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nsIThread *thread = mXPCOMThread;
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thread->Release();
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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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{
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MonitorAutoLock lock(mMonitor);
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// Yeah, there is not a thread yet, but we want to make sure
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// the sequencing is correct.
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mBlockingIOWatcher = MakeUnique<detail::BlockingIOWatcher>();
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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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}
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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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return Dispatch(do_AddRef(aRunnable), aLevel);
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}
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nsresult CacheIOThread::Dispatch(already_AddRefed<nsIRunnable> aRunnable,
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uint32_t aLevel)
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{
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NS_ENSURE_ARG(aLevel < LAST_LEVEL);
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nsCOMPtr<nsIRunnable> runnable(aRunnable);
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// Runnable is always expected to be non-null, hard null-check bellow.
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MOZ_ASSERT(runnable);
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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(runnable.forget(), 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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mQueueLength[OPEN_PRIORITY] += mEventQueue[OPEN].Length();
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mQueueLength[OPEN] -= mEventQueue[OPEN].Length();
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mEventQueue[OPEN_PRIORITY].AppendElements(mEventQueue[OPEN]);
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mEventQueue[OPEN].Clear();
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return DispatchInternal(do_AddRef(aRunnable), OPEN_PRIORITY);
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}
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nsresult CacheIOThread::DispatchInternal(already_AddRefed<nsIRunnable> aRunnable,
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uint32_t aLevel)
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{
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nsCOMPtr<nsIRunnable> runnable(aRunnable);
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#ifdef MOZ_TASK_TRACER
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if (tasktracer::IsStartLogging()) {
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runnable = tasktracer::CreateTracedRunnable(runnable.forget());
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(static_cast<tasktracer::TracedRunnable*>(runnable.get()))->DispatchTask();
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}
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#endif
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if (NS_WARN_IF(!runnable))
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return NS_ERROR_NULL_POINTER;
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mMonitor.AssertCurrentThreadOwns();
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++mQueueLength[aLevel];
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mEventQueue[aLevel].AppendElement(runnable.forget());
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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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uint32_t CacheIOThread::QueueSize(bool highPriority)
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{
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MonitorAutoLock lock(mMonitor);
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if (highPriority) {
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return mQueueLength[OPEN_PRIORITY] + mQueueLength[READ_PRIORITY];
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}
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return mQueueLength[OPEN_PRIORITY] + mQueueLength[READ_PRIORITY] +
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mQueueLength[MANAGEMENT] + mQueueLength[OPEN] + mQueueLength[READ];
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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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void CacheIOThread::Shutdown()
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{
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if (!mThread) {
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return;
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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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}
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void CacheIOThread::CancelBlockingIO()
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{
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// This is an attempt to cancel any blocking I/O operation taking
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// too long time.
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if (!mBlockingIOWatcher) {
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return;
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}
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if (!mIOCancelableEvents) {
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LOG(("CacheIOThread::CancelBlockingIO, no blocking operation to cancel"));
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return;
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}
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// OK, when we are here, we are processing an IO on the thread that
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// can be cancelled.
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mBlockingIOWatcher->WatchAndCancel(mMonitor);
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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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while (!mXPCOMThread) {
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lock.Wait();
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}
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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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// XXXmstange We'd like to register this thread with the profiler, but doing
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// so causes leaks, see bug 1323100.
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NS_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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MOZ_ASSERT(mBlockingIOWatcher);
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mBlockingIOWatcher->InitThread();
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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 = xpcomThread.forget().take();
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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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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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nsIThread *thread = mXPCOMThread;
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rv = thread->ProcessNextEvent(false, &processedEvent);
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MOZ_ASSERT(mBlockingIOWatcher);
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mBlockingIOWatcher->NotifyOperationDone();
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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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}
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if (mShutdown) {
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break;
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}
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lock.Wait(PR_INTERVAL_NO_TIMEOUT);
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} while (true);
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MOZ_ASSERT(!EventsPending());
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#ifdef DEBUG
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// This is for correct assertion on XPCOM events dispatch.
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mInsideLoop = false;
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#endif
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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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void CacheIOThread::LoopOneLevel(uint32_t aLevel)
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{
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EventQueue events;
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events.SwapElements(mEventQueue[aLevel]);
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EventQueue::size_type length = events.Length();
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mCurrentlyExecutingLevel = aLevel;
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bool returnEvents = false;
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bool reportTelementry = true;
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EventQueue::size_type 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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if (reportTelementry) {
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reportTelementry = false;
|
|
CacheIOTelemetry::Report(aLevel, length);
|
|
}
|
|
|
|
// Drop any previous flagging, only an event on the current level may set
|
|
// this flag.
|
|
mRerunCurrentEvent = false;
|
|
|
|
events[index]->Run();
|
|
|
|
MOZ_ASSERT(mBlockingIOWatcher);
|
|
mBlockingIOWatcher->NotifyOperationDone();
|
|
|
|
if (mRerunCurrentEvent) {
|
|
// The event handler yields to higher priority events and wants to rerun.
|
|
returnEvents = true;
|
|
break;
|
|
}
|
|
|
|
--mQueueLength[aLevel];
|
|
|
|
// Release outside the lock.
|
|
events[index] = nullptr;
|
|
}
|
|
}
|
|
|
|
if (returnEvents)
|
|
mEventQueue[aLevel].InsertElementsAt(0, events.Elements() + index, length - index);
|
|
}
|
|
|
|
bool CacheIOThread::EventsPending(uint32_t aLastLevel)
|
|
{
|
|
return mLowestLevelWaiting < aLastLevel || mHasXPCOMEvents;
|
|
}
|
|
|
|
NS_IMETHODIMP CacheIOThread::OnDispatchedEvent(nsIThreadInternal *thread)
|
|
{
|
|
MonitorAutoLock lock(mMonitor);
|
|
mHasXPCOMEvents = true;
|
|
MOZ_ASSERT(mInsideLoop);
|
|
lock.Notify();
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP CacheIOThread::OnProcessNextEvent(nsIThreadInternal *thread, bool mayWait)
|
|
{
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP CacheIOThread::AfterProcessNextEvent(nsIThreadInternal *thread,
|
|
bool eventWasProcessed)
|
|
{
|
|
return NS_OK;
|
|
}
|
|
|
|
// Memory reporting
|
|
|
|
size_t CacheIOThread::SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
MonitorAutoLock lock(const_cast<CacheIOThread*>(this)->mMonitor);
|
|
|
|
size_t n = 0;
|
|
n += mallocSizeOf(mThread);
|
|
for (uint32_t level = 0; level < LAST_LEVEL; ++level) {
|
|
n += mEventQueue[level].ShallowSizeOfExcludingThis(mallocSizeOf);
|
|
// Events referenced by the queues are arbitrary objects we cannot be sure
|
|
// are reported elsewhere as well as probably not implementing nsISizeOf
|
|
// interface. Deliberatly omitting them from reporting here.
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
size_t CacheIOThread::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
|
|
{
|
|
return mallocSizeOf(this) + SizeOfExcludingThis(mallocSizeOf);
|
|
}
|
|
|
|
CacheIOThread::Cancelable::Cancelable(bool aCancelable)
|
|
: mCancelable(aCancelable)
|
|
{
|
|
// This will only ever be used on the I/O thread,
|
|
// which is expected to be alive longer than this class.
|
|
MOZ_ASSERT(CacheIOThread::sSelf);
|
|
MOZ_ASSERT(CacheIOThread::sSelf->IsCurrentThread());
|
|
|
|
if (mCancelable) {
|
|
++CacheIOThread::sSelf->mIOCancelableEvents;
|
|
}
|
|
}
|
|
|
|
CacheIOThread::Cancelable::~Cancelable()
|
|
{
|
|
MOZ_ASSERT(CacheIOThread::sSelf);
|
|
|
|
if (mCancelable) {
|
|
--CacheIOThread::sSelf->mIOCancelableEvents;
|
|
}
|
|
}
|
|
|
|
} // namespace net
|
|
} // namespace mozilla
|