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win32threadpool.cpp
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win32threadpool.cpp
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*++
Module Name:
Win32ThreadPool.cpp
Abstract:
This module implements Threadpool support using Win32 APIs
Revision History:
December 1999 - Created
--*/
#include "common.h"
#include "log.h"
#include "threadpoolrequest.h"
#include "win32threadpool.h"
#include "delegateinfo.h"
#include "eeconfig.h"
#include "dbginterface.h"
#include "corhost.h"
#include "eventtrace.h"
#include "threads.h"
#include "appdomain.inl"
#include "nativeoverlapped.h"
#include "hillclimbing.h"
#include "configuration.h"
#ifndef FEATURE_PAL
#ifndef DACCESS_COMPILE
// APIs that must be accessed through dynamic linking.
typedef int (WINAPI *NtQueryInformationThreadProc) (
HANDLE ThreadHandle,
THREADINFOCLASS ThreadInformationClass,
PVOID ThreadInformation,
ULONG ThreadInformationLength,
PULONG ReturnLength);
NtQueryInformationThreadProc g_pufnNtQueryInformationThread = NULL;
typedef int (WINAPI *NtQuerySystemInformationProc) (
SYSTEM_INFORMATION_CLASS SystemInformationClass,
PVOID SystemInformation,
ULONG SystemInformationLength,
PULONG ReturnLength OPTIONAL);
NtQuerySystemInformationProc g_pufnNtQuerySystemInformation = NULL;
typedef HANDLE (WINAPI * CreateWaitableTimerExProc) (
LPSECURITY_ATTRIBUTES lpTimerAttributes,
LPCTSTR lpTimerName,
DWORD dwFlags,
DWORD dwDesiredAccess);
CreateWaitableTimerExProc g_pufnCreateWaitableTimerEx = NULL;
typedef BOOL (WINAPI * SetWaitableTimerExProc) (
HANDLE hTimer,
const LARGE_INTEGER *lpDueTime,
LONG lPeriod,
PTIMERAPCROUTINE pfnCompletionRoutine,
LPVOID lpArgToCompletionRoutine,
void* WakeContext, //should be PREASON_CONTEXT, but it's not defined for us (and we don't use it)
ULONG TolerableDelay);
SetWaitableTimerExProc g_pufnSetWaitableTimerEx = NULL;
#endif // !DACCESS_COMPILE
#endif // !FEATURE_PAL
BOOL ThreadpoolMgr::InitCompletionPortThreadpool = FALSE;
HANDLE ThreadpoolMgr::GlobalCompletionPort; // used for binding io completions on file handles
SVAL_IMPL(ThreadpoolMgr::ThreadCounter,ThreadpoolMgr,CPThreadCounter);
SVAL_IMPL_INIT(LONG,ThreadpoolMgr,MaxLimitTotalCPThreads,1000); // = MaxLimitCPThreadsPerCPU * number of CPUS
SVAL_IMPL(LONG,ThreadpoolMgr,MinLimitTotalCPThreads);
SVAL_IMPL(LONG,ThreadpoolMgr,MaxFreeCPThreads); // = MaxFreeCPThreadsPerCPU * Number of CPUS
Volatile<LONG> ThreadpoolMgr::NumCPInfrastructureThreads = 0; // number of threads currently busy handling draining cycle
SVAL_IMPL(ThreadpoolMgr::ThreadCounter, ThreadpoolMgr, WorkerCounter);
SVAL_IMPL(LONG,ThreadpoolMgr,MinLimitTotalWorkerThreads); // = MaxLimitCPThreadsPerCPU * number of CPUS
SVAL_IMPL(LONG,ThreadpoolMgr,MaxLimitTotalWorkerThreads); // = MaxLimitCPThreadsPerCPU * number of CPUS
SVAL_IMPL(LONG,ThreadpoolMgr,cpuUtilization);
LONG ThreadpoolMgr::cpuUtilizationAverage = 0;
HillClimbing ThreadpoolMgr::HillClimbingInstance;
BYTE ThreadpoolMgr::padding1[64];
LONG ThreadpoolMgr::PriorCompletedWorkRequests = 0;
DWORD ThreadpoolMgr::PriorCompletedWorkRequestsTime;
DWORD ThreadpoolMgr::NextCompletedWorkRequestsTime;
BYTE ThreadpoolMgr::padding2[64];
LARGE_INTEGER ThreadpoolMgr::CurrentSampleStartTime;
int ThreadpoolMgr::ThreadAdjustmentInterval;
#define INVALID_HANDLE ((HANDLE) -1)
#define NEW_THREAD_THRESHOLD 7 // Number of requests outstanding before we start a new thread
#define CP_THREAD_PENDINGIO_WAIT 5000 // polling interval when thread is retired but has a pending io
#define GATE_THREAD_DELAY 500 /*milliseconds*/
#define GATE_THREAD_DELAY_TOLERANCE 50 /*milliseconds*/
#define DELAY_BETWEEN_SUSPENDS 5000 + GATE_THREAD_DELAY // time to delay between suspensions
#define SUSPEND_TIME GATE_THREAD_DELAY+100 // milliseconds to suspend during SuspendProcessing
LONG ThreadpoolMgr::Initialization=0; // indicator of whether the threadpool is initialized.
Volatile<unsigned int> ThreadpoolMgr::LastDequeueTime; // used to determine if work items are getting thread starved
int ThreadpoolMgr::offset_counter = 0;
SPTR_IMPL(WorkRequest,ThreadpoolMgr,WorkRequestHead); // Head of work request queue
SPTR_IMPL(WorkRequest,ThreadpoolMgr,WorkRequestTail); // Head of work request queue
SVAL_IMPL(ThreadpoolMgr::LIST_ENTRY,ThreadpoolMgr,TimerQueue); // queue of timers
//unsigned int ThreadpoolMgr::LastCpuSamplingTime=0; // last time cpu utilization was sampled by gate thread
unsigned int ThreadpoolMgr::LastCPThreadCreation=0; // last time a completion port thread was created
unsigned int ThreadpoolMgr::NumberOfProcessors; // = NumberOfWorkerThreads - no. of blocked threads
CrstStatic ThreadpoolMgr::WorkerCriticalSection;
CLREvent * ThreadpoolMgr::RetiredCPWakeupEvent; // wakeup event for completion port threads
CrstStatic ThreadpoolMgr::WaitThreadsCriticalSection;
ThreadpoolMgr::LIST_ENTRY ThreadpoolMgr::WaitThreadsHead;
ThreadpoolMgr::UnfairSemaphore* ThreadpoolMgr::WorkerSemaphore;
CLRSemaphore* ThreadpoolMgr::RetiredWorkerSemaphore;
CrstStatic ThreadpoolMgr::TimerQueueCriticalSection;
HANDLE ThreadpoolMgr::TimerThread=NULL;
Thread *ThreadpoolMgr::pTimerThread=NULL;
DWORD ThreadpoolMgr::LastTickCount;
#ifdef _DEBUG
DWORD ThreadpoolMgr::TickCountAdjustment=0;
#endif
LONG ThreadpoolMgr::GateThreadStatus=GATE_THREAD_STATUS_NOT_RUNNING;
ThreadpoolMgr::RecycledListsWrapper ThreadpoolMgr::RecycledLists;
ThreadpoolMgr::TimerInfo *ThreadpoolMgr::TimerInfosToBeRecycled = NULL;
BOOL ThreadpoolMgr::IsApcPendingOnWaitThread = FALSE;
#ifndef DACCESS_COMPILE
// Macros for inserting/deleting from doubly linked list
#define InitializeListHead(ListHead) (\
(ListHead)->Flink = (ListHead)->Blink = (ListHead))
//
// these are named the same as slightly different macros in the NT headers
//
#undef RemoveHeadList
#undef RemoveEntryList
#undef InsertTailList
#undef InsertHeadList
#define RemoveHeadList(ListHead,FirstEntry) \
{\
FirstEntry = (LIST_ENTRY*) (ListHead)->Flink;\
((LIST_ENTRY*)FirstEntry->Flink)->Blink = (ListHead);\
(ListHead)->Flink = FirstEntry->Flink;\
}
#define RemoveEntryList(Entry) {\
LIST_ENTRY* _EX_Entry;\
_EX_Entry = (Entry);\
((LIST_ENTRY*) _EX_Entry->Blink)->Flink = _EX_Entry->Flink;\
((LIST_ENTRY*) _EX_Entry->Flink)->Blink = _EX_Entry->Blink;\
}
#define InsertTailList(ListHead,Entry) \
(Entry)->Flink = (ListHead);\
(Entry)->Blink = (ListHead)->Blink;\
((LIST_ENTRY*)(ListHead)->Blink)->Flink = (Entry);\
(ListHead)->Blink = (Entry);
#define InsertHeadList(ListHead,Entry) {\
LIST_ENTRY* _EX_Flink;\
LIST_ENTRY* _EX_ListHead;\
_EX_ListHead = (LIST_ENTRY*)(ListHead);\
_EX_Flink = (LIST_ENTRY*) _EX_ListHead->Flink;\
(Entry)->Flink = _EX_Flink;\
(Entry)->Blink = _EX_ListHead;\
_EX_Flink->Blink = (Entry);\
_EX_ListHead->Flink = (Entry);\
}
#define IsListEmpty(ListHead) \
((ListHead)->Flink == (ListHead))
#define SetLastHRError(hr) \
if (HRESULT_FACILITY(hr) == FACILITY_WIN32)\
SetLastError(HRESULT_CODE(hr));\
else \
SetLastError(ERROR_INVALID_DATA);\
/************************************************************************/
void ThreadpoolMgr::RecycledListsWrapper::Initialize( unsigned int numProcs )
{
CONTRACTL
{
THROWS;
MODE_ANY;
GC_NOTRIGGER;
}
CONTRACTL_END;
pRecycledListPerProcessor = new RecycledListInfo[numProcs][MEMTYPE_COUNT];
}
//--//
void ThreadpoolMgr::EnsureInitialized()
{
CONTRACTL
{
THROWS; // Initialize can throw
MODE_ANY;
GC_NOTRIGGER;
}
CONTRACTL_END;
if (IsInitialized())
return;
DWORD dwSwitchCount = 0;
retry:
if (InterlockedCompareExchange(&Initialization, 1, 0) == 0)
{
if (Initialize())
Initialization = -1;
else
{
Initialization = 0;
COMPlusThrowOM();
}
}
else // someone has already begun initializing.
{
// wait until it finishes
while (Initialization != -1)
{
__SwitchToThread(0, ++dwSwitchCount);
goto retry;
}
}
}
DWORD GetDefaultMaxLimitWorkerThreads(DWORD minLimit)
{
CONTRACTL
{
MODE_ANY;
GC_NOTRIGGER;
NOTHROW;
}
CONTRACTL_END;
//
// We determine the max limit for worker threads as follows:
//
// 1) It must be at least MinLimitTotalWorkerThreads
// 2) It must be no greater than (half the virtual address space)/(thread stack size)
// 3) It must be <= MaxPossibleWorkerThreads
//
// TODO: what about CP threads? Can they follow a similar plan? How do we allocate
// thread counts between the two kinds of threads?
//
SIZE_T stackReserveSize = 0;
Thread::GetProcessDefaultStackSize(&stackReserveSize, NULL);
ULONGLONG halfVirtualAddressSpace;
MEMORYSTATUSEX memStats;
memStats.dwLength = sizeof(memStats);
if (GlobalMemoryStatusEx(&memStats))
{
halfVirtualAddressSpace = memStats.ullTotalVirtual / 2;
}
else
{
//assume the normal Win32 32-bit virtual address space
halfVirtualAddressSpace = 0x000000007FFE0000ull / 2;
}
ULONGLONG limit = halfVirtualAddressSpace / stackReserveSize;
limit = max(limit, (ULONGLONG)minLimit);
limit = min(limit, (ULONGLONG)ThreadpoolMgr::ThreadCounter::MaxPossibleCount);
_ASSERTE(FitsIn<DWORD>(limit));
return (DWORD)limit;
}
DWORD GetForceMinWorkerThreadsValue()
{
WRAPPER_NO_CONTRACT;
return Configuration::GetKnobDWORDValue(W("System.Threading.ThreadPool.MinThreads"), CLRConfig::INTERNAL_ThreadPool_ForceMinWorkerThreads);
}
DWORD GetForceMaxWorkerThreadsValue()
{
WRAPPER_NO_CONTRACT;
return Configuration::GetKnobDWORDValue(W("System.Threading.ThreadPool.MaxThreads"), CLRConfig::INTERNAL_ThreadPool_ForceMaxWorkerThreads);
}
BOOL ThreadpoolMgr::Initialize()
{
CONTRACTL
{
THROWS;
MODE_ANY;
GC_NOTRIGGER;
INJECT_FAULT(COMPlusThrowOM());
}
CONTRACTL_END;
BOOL bRet = FALSE;
BOOL bExceptionCaught = FALSE;
UnManagedPerAppDomainTPCount* pADTPCount;
pADTPCount = PerAppDomainTPCountList::GetUnmanagedTPCount();
//ThreadPool_CPUGroup
CPUGroupInfo::EnsureInitialized();
if (CPUGroupInfo::CanEnableGCCPUGroups() && CPUGroupInfo::CanEnableThreadUseAllCpuGroups())
NumberOfProcessors = CPUGroupInfo::GetNumActiveProcessors();
else
NumberOfProcessors = GetCurrentProcessCpuCount();
InitPlatformVariables();
EX_TRY
{
ThreadAdjustmentInterval = CLRConfig::GetConfigValue(CLRConfig::INTERNAL_HillClimbing_SampleIntervalLow);
pADTPCount->InitResources();
WorkerCriticalSection.Init(CrstThreadpoolWorker);
WaitThreadsCriticalSection.Init(CrstThreadpoolWaitThreads);
TimerQueueCriticalSection.Init(CrstThreadpoolTimerQueue);
// initialize WaitThreadsHead
InitializeListHead(&WaitThreadsHead);
// initialize TimerQueue
InitializeListHead(&TimerQueue);
RetiredCPWakeupEvent = new CLREvent();
RetiredCPWakeupEvent->CreateAutoEvent(FALSE);
_ASSERTE(RetiredCPWakeupEvent->IsValid());
WorkerSemaphore = new UnfairSemaphore(ThreadCounter::MaxPossibleCount);
RetiredWorkerSemaphore = new CLRSemaphore();
RetiredWorkerSemaphore->Create(0, ThreadCounter::MaxPossibleCount);
//ThreadPool_CPUGroup
if (CPUGroupInfo::CanEnableGCCPUGroups() && CPUGroupInfo::CanEnableThreadUseAllCpuGroups())
RecycledLists.Initialize( CPUGroupInfo::GetNumActiveProcessors() );
else
RecycledLists.Initialize( g_SystemInfo.dwNumberOfProcessors );
/*
{
SYSTEM_INFO sysInfo;
::GetSystemInfo( &sysInfo );
RecycledLists.Initialize( sysInfo.dwNumberOfProcessors );
}
*/
}
EX_CATCH
{
pADTPCount->CleanupResources();
if (RetiredCPWakeupEvent)
{
delete RetiredCPWakeupEvent;
RetiredCPWakeupEvent = NULL;
}
// Note: It is fine to call Destroy on unitialized critical sections
WorkerCriticalSection.Destroy();
WaitThreadsCriticalSection.Destroy();
TimerQueueCriticalSection.Destroy();
bExceptionCaught = TRUE;
}
EX_END_CATCH(SwallowAllExceptions);
if (bExceptionCaught)
{
goto end;
}
// initialize Worker and CP thread settings
DWORD forceMin;
forceMin = GetForceMinWorkerThreadsValue();
MinLimitTotalWorkerThreads = forceMin > 0 ? (LONG)forceMin : (LONG)NumberOfProcessors;
DWORD forceMax;
forceMax = GetForceMaxWorkerThreadsValue();
MaxLimitTotalWorkerThreads = forceMax > 0 ? (LONG)forceMax : (LONG)GetDefaultMaxLimitWorkerThreads(MinLimitTotalWorkerThreads);
ThreadCounter::Counts counts;
counts.NumActive = 0;
counts.NumWorking = 0;
counts.NumRetired = 0;
counts.MaxWorking = MinLimitTotalWorkerThreads;
WorkerCounter.counts.AsLongLong = counts.AsLongLong;
#ifdef _DEBUG
TickCountAdjustment = CLRConfig::GetConfigValue(CLRConfig::INTERNAL_ThreadpoolTickCountAdjustment);
#endif
// initialize CP thread settings
MinLimitTotalCPThreads = NumberOfProcessors;
// Use volatile store to guarantee make the value visible to the DAC (the store can be optimized out otherwise)
VolatileStoreWithoutBarrier<LONG>(&MaxFreeCPThreads, NumberOfProcessors*MaxFreeCPThreadsPerCPU);
counts.NumActive = 0;
counts.NumWorking = 0;
counts.NumRetired = 0;
counts.MaxWorking = MinLimitTotalCPThreads;
CPThreadCounter.counts.AsLongLong = counts.AsLongLong;
#ifndef FEATURE_PAL
#ifdef FEATURE_INCLUDE_ALL_INTERFACES
if (CLRIoCompletionHosted())
{
HANDLE hPort;
HRESULT hr;
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = CorHost2::GetHostIoCompletionManager()->CreateIoCompletionPort(&hPort);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
goto end;
GlobalCompletionPort = hPort;
}
else
#endif // FEATURE_INCLUDE_ALL_INTERFACES
{
GlobalCompletionPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE,
NULL,
0, /*ignored for invalid handle value*/
NumberOfProcessors);
}
#endif // !FEATURE_PAL
HillClimbingInstance.Initialize();
bRet = TRUE;
end:
return bRet;
}
void ThreadpoolMgr::InitPlatformVariables()
{
CONTRACTL
{
NOTHROW;
MODE_ANY;
GC_NOTRIGGER;
}
CONTRACTL_END;
#ifndef FEATURE_PAL
HINSTANCE hNtDll;
HINSTANCE hCoreSynch;
{
CONTRACT_VIOLATION(GCViolation|FaultViolation);
hNtDll = CLRLoadLibrary(W("ntdll.dll"));
_ASSERTE(hNtDll);
#ifdef FEATURE_CORESYSTEM
hCoreSynch = CLRLoadLibrary(W("api-ms-win-core-synch-l1-1-0.dll"));
#else
hCoreSynch = CLRLoadLibrary(W("kernel32.dll"));
#endif
_ASSERTE(hCoreSynch);
}
// These APIs must be accessed via dynamic binding since they may be removed in future
// OS versions.
g_pufnNtQueryInformationThread = (NtQueryInformationThreadProc)GetProcAddress(hNtDll,"NtQueryInformationThread");
g_pufnNtQuerySystemInformation = (NtQuerySystemInformationProc)GetProcAddress(hNtDll,"NtQuerySystemInformation");
// These APIs are only supported on newer Windows versions
g_pufnCreateWaitableTimerEx = (CreateWaitableTimerExProc)GetProcAddress(hCoreSynch, "CreateWaitableTimerExW");
g_pufnSetWaitableTimerEx = (SetWaitableTimerExProc)GetProcAddress(hCoreSynch, "SetWaitableTimerEx");
#endif
}
BOOL ThreadpoolMgr::SetMaxThreadsHelper(DWORD MaxWorkerThreads,
DWORD MaxIOCompletionThreads)
{
CONTRACTL
{
THROWS; // Crst can throw and toggle GC mode
MODE_ANY;
GC_TRIGGERS;
}
CONTRACTL_END;
BOOL result = FALSE;
// doesn't need to be WorkerCS, but using it to avoid race condition between setting min and max, and didn't want to create a new CS.
CrstHolder csh(&WorkerCriticalSection);
if (MaxWorkerThreads >= (DWORD)MinLimitTotalWorkerThreads &&
MaxIOCompletionThreads >= (DWORD)MinLimitTotalCPThreads)
{
BEGIN_SO_INTOLERANT_CODE(GetThread());
if (GetForceMaxWorkerThreadsValue() == 0)
{
MaxLimitTotalWorkerThreads = min(MaxWorkerThreads, (DWORD)ThreadCounter::MaxPossibleCount);
ThreadCounter::Counts counts = WorkerCounter.GetCleanCounts();
while (counts.MaxWorking > MaxLimitTotalWorkerThreads)
{
ThreadCounter::Counts newCounts = counts;
newCounts.MaxWorking = MaxLimitTotalWorkerThreads;
ThreadCounter::Counts oldCounts = WorkerCounter.CompareExchangeCounts(newCounts, counts);
if (oldCounts == counts)
counts = newCounts;
else
counts = oldCounts;
}
}
END_SO_INTOLERANT_CODE;
MaxLimitTotalCPThreads = min(MaxIOCompletionThreads, (DWORD)ThreadCounter::MaxPossibleCount);
result = TRUE;
}
return result;
}
/************************************************************************/
BOOL ThreadpoolMgr::SetMaxThreads(DWORD MaxWorkerThreads,
DWORD MaxIOCompletionThreads)
{
CONTRACTL
{
THROWS; // SetMaxThreadsHelper can throw and toggle GC mode
MODE_ANY;
GC_TRIGGERS;
}
CONTRACTL_END;
#ifdef FEATURE_INCLUDE_ALL_INTERFACES
IHostThreadpoolManager *threadpoolProvider = CorHost2::GetHostThreadpoolManager();
if (threadpoolProvider) {
HRESULT hr;
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = threadpoolProvider->SetMaxThreads(MaxWorkerThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
IHostIoCompletionManager *ioCompletionProvider = CorHost2::GetHostIoCompletionManager();
if (ioCompletionProvider) {
HRESULT hr;
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = ioCompletionProvider->SetMaxThreads(MaxIOCompletionThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
if (threadpoolProvider && ioCompletionProvider) {
return TRUE;
}
#endif // FEATURE_INCLUDE_ALL_INTERFACES
if (IsInitialized())
{
return SetMaxThreadsHelper(MaxWorkerThreads, MaxIOCompletionThreads);
}
if (InterlockedCompareExchange(&Initialization, 1, 0) == 0)
{
Initialize();
BOOL helper_result = FALSE;
helper_result = SetMaxThreadsHelper(MaxWorkerThreads, MaxIOCompletionThreads);
Initialization = -1;
return helper_result;
}
else // someone else is initializing. Too late, return false
{
return FALSE;
}
}
BOOL ThreadpoolMgr::GetMaxThreads(DWORD* MaxWorkerThreads,
DWORD* MaxIOCompletionThreads)
{
LIMITED_METHOD_CONTRACT;
#ifdef FEATURE_INCLUDE_ALL_INTERFACES
HRESULT hr = S_OK;
IHostThreadpoolManager *threadpoolProvider = CorHost2::GetHostThreadpoolManager();
if (threadpoolProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = threadpoolProvider->GetMaxThreads(MaxWorkerThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
IHostIoCompletionManager *ioCompletionProvider = CorHost2::GetHostIoCompletionManager();
if (ioCompletionProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = ioCompletionProvider->GetMaxThreads(MaxIOCompletionThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
if (threadpoolProvider && ioCompletionProvider) {
return TRUE;
}
#endif // FEATURE_INCLUDE_ALL_INTERFACES
if (!MaxWorkerThreads || !MaxIOCompletionThreads)
{
SetLastHRError(ERROR_INVALID_DATA);
return FALSE;
}
if (IsInitialized())
{
*MaxWorkerThreads = (DWORD)MaxLimitTotalWorkerThreads;
*MaxIOCompletionThreads = MaxLimitTotalCPThreads;
}
else
{
BEGIN_SO_INTOLERANT_CODE_NOTHROW(GetThread(), *MaxWorkerThreads = 1024);
//ThreadPool_CPUGroup
CPUGroupInfo::EnsureInitialized();
if (CPUGroupInfo::CanEnableGCCPUGroups() && CPUGroupInfo::CanEnableThreadUseAllCpuGroups())
NumberOfProcessors = CPUGroupInfo::GetNumActiveProcessors();
else
NumberOfProcessors = GetCurrentProcessCpuCount();
DWORD min = GetForceMinWorkerThreadsValue();
if (min == 0)
min = NumberOfProcessors;
DWORD forceMax = GetForceMaxWorkerThreadsValue();
if (forceMax > 0)
{
*MaxWorkerThreads = forceMax;
}
else
{
*MaxWorkerThreads = GetDefaultMaxLimitWorkerThreads(min);
}
END_SO_INTOLERANT_CODE;
*MaxIOCompletionThreads = MaxLimitTotalCPThreads;
}
return TRUE;
}
BOOL ThreadpoolMgr::SetMinThreads(DWORD MinWorkerThreads,
DWORD MinIOCompletionThreads)
{
CONTRACTL
{
THROWS; // Crst can throw and toggle GC mode
MODE_ANY;
GC_TRIGGERS;
}
CONTRACTL_END;
#ifdef FEATURE_INCLUDE_ALL_INTERFACES
HRESULT hr = S_OK;
IHostThreadpoolManager *threadpoolProvider = CorHost2::GetHostThreadpoolManager();
if (threadpoolProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = threadpoolProvider->SetMinThreads(MinWorkerThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
IHostIoCompletionManager *ioCompletionProvider = CorHost2::GetHostIoCompletionManager();
if (ioCompletionProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = ioCompletionProvider->SetMinThreads(MinIOCompletionThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
if (threadpoolProvider && ioCompletionProvider) {
return TRUE;
}
#endif // FEATURE_INCLUDE_ALL_INTERFACES
if (!IsInitialized())
{
if (InterlockedCompareExchange(&Initialization, 1, 0) == 0)
{
Initialize();
Initialization = -1;
}
}
if (IsInitialized())
{
// doesn't need to be WorkerCS, but using it to avoid race condition between setting min and max, and didn't want to create a new CS.
CrstHolder csh(&WorkerCriticalSection);
BOOL init_result = false;
if (MinWorkerThreads >= 0 && MinIOCompletionThreads >= 0 &&
MinWorkerThreads <= (DWORD) MaxLimitTotalWorkerThreads &&
MinIOCompletionThreads <= (DWORD) MaxLimitTotalCPThreads)
{
BEGIN_SO_INTOLERANT_CODE(GetThread());
if (GetForceMinWorkerThreadsValue() == 0)
{
MinLimitTotalWorkerThreads = min(MinWorkerThreads, (DWORD)ThreadCounter::MaxPossibleCount);
ThreadCounter::Counts counts = WorkerCounter.GetCleanCounts();
while (counts.MaxWorking < MinLimitTotalWorkerThreads)
{
ThreadCounter::Counts newCounts = counts;
newCounts.MaxWorking = MinLimitTotalWorkerThreads;
ThreadCounter::Counts oldCounts = WorkerCounter.CompareExchangeCounts(newCounts, counts);
if (oldCounts == counts)
{
counts = newCounts;
// if we increased the limit, and there are pending workitems, we need
// to dispatch a thread to process the work.
if (newCounts.MaxWorking > oldCounts.MaxWorking &&
PerAppDomainTPCountList::AreRequestsPendingInAnyAppDomains())
{
MaybeAddWorkingWorker();
}
}
else
{
counts = oldCounts;
}
}
}
END_SO_INTOLERANT_CODE;
MinLimitTotalCPThreads = min(MinIOCompletionThreads, (DWORD)ThreadCounter::MaxPossibleCount);
init_result = TRUE;
}
return init_result;
}
// someone else is initializing. Too late, return false
return FALSE;
}
BOOL ThreadpoolMgr::GetMinThreads(DWORD* MinWorkerThreads,
DWORD* MinIOCompletionThreads)
{
LIMITED_METHOD_CONTRACT;
#ifdef FEATURE_INCLUDE_ALL_INTERFACES
HRESULT hr = S_OK;
IHostThreadpoolManager *threadpoolProvider = CorHost2::GetHostThreadpoolManager();
if (threadpoolProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = threadpoolProvider->GetMinThreads(MinWorkerThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
IHostIoCompletionManager *ioCompletionProvider = CorHost2::GetHostIoCompletionManager();
if (ioCompletionProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = ioCompletionProvider->GetMinThreads(MinIOCompletionThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
if (threadpoolProvider && ioCompletionProvider) {
return TRUE;
}
#endif // FEATURE_INCLUDE_ALL_INTERFACES
if (!MinWorkerThreads || !MinIOCompletionThreads)
{
SetLastHRError(ERROR_INVALID_DATA);
return FALSE;
}
if (IsInitialized())
{
*MinWorkerThreads = (DWORD)MinLimitTotalWorkerThreads;
*MinIOCompletionThreads = MinLimitTotalCPThreads;
}
else
{
CPUGroupInfo::EnsureInitialized();
if (CPUGroupInfo::CanEnableGCCPUGroups() && CPUGroupInfo::CanEnableThreadUseAllCpuGroups())
NumberOfProcessors = CPUGroupInfo::GetNumActiveProcessors();
else
NumberOfProcessors = GetCurrentProcessCpuCount();
DWORD forceMin;
BEGIN_SO_INTOLERANT_CODE_NOTHROW(GetThread(), forceMin=0);
forceMin = GetForceMinWorkerThreadsValue();
END_SO_INTOLERANT_CODE;
*MinWorkerThreads = forceMin > 0 ? forceMin : NumberOfProcessors;
*MinIOCompletionThreads = NumberOfProcessors;
}
return TRUE;
}
BOOL ThreadpoolMgr::GetAvailableThreads(DWORD* AvailableWorkerThreads,
DWORD* AvailableIOCompletionThreads)
{
LIMITED_METHOD_CONTRACT;
if (IsInitialized())
{
#ifdef FEATURE_INCLUDE_ALL_INTERFACES
HRESULT hr = S_OK;
IHostThreadpoolManager *threadpoolProvider = CorHost2::GetHostThreadpoolManager();
if (threadpoolProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = threadpoolProvider->GetAvailableThreads(AvailableWorkerThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
IHostIoCompletionManager *ioCompletionProvider = CorHost2::GetHostIoCompletionManager();
if (ioCompletionProvider) {
BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
hr = ioCompletionProvider->GetAvailableThreads(AvailableIOCompletionThreads);
END_SO_TOLERANT_CODE_CALLING_HOST;
if (FAILED(hr))
{
SetLastHRError(hr);
return FALSE;
}
}
if (threadpoolProvider && ioCompletionProvider) {
return TRUE;
}
#endif // FEATURE_INCLUDE_ALL_INTERFACES
if (!AvailableWorkerThreads || !AvailableIOCompletionThreads)
{
SetLastHRError(ERROR_INVALID_DATA);
return FALSE;
}
ThreadCounter::Counts counts = WorkerCounter.GetCleanCounts();
if (MaxLimitTotalWorkerThreads < counts.NumActive)
*AvailableWorkerThreads = 0;
else
*AvailableWorkerThreads = MaxLimitTotalWorkerThreads - counts.NumWorking;
counts = CPThreadCounter.GetCleanCounts();
if (MaxLimitTotalCPThreads < counts.NumActive)
*AvailableIOCompletionThreads = counts.NumActive - counts.NumWorking;
else
*AvailableIOCompletionThreads = MaxLimitTotalCPThreads - counts.NumWorking;
}
else
{
GetMaxThreads(AvailableWorkerThreads,AvailableIOCompletionThreads);
}
return TRUE;
}
void QueueUserWorkItemHelp(LPTHREAD_START_ROUTINE Function, PVOID Context)
{
STATIC_CONTRACT_THROWS;
STATIC_CONTRACT_GC_TRIGGERS;
STATIC_CONTRACT_MODE_ANY;
/* Cannot use contract here because of SEH
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;*/
Function(Context);
Thread *pThread = GetThread();
if (pThread) {
if (pThread->IsAbortRequested())
pThread->EEResetAbort(Thread::TAR_ALL);
pThread->InternalReset(FALSE);
}
}
//
// WorkingThreadCounts tracks the number of worker threads currently doing user work, and the maximum number of such threads
// since the last time TakeMaxWorkingThreadCount was called. This information is for diagnostic purposes only,
// and is tracked only if the CLR config value INTERNAL_ThreadPool_EnableWorkerTracking is non-zero (this feature is off
// by default).
//
union WorkingThreadCounts
{
struct
{
int currentWorking : 16;
int maxWorking : 16;
};
LONG asLong;
};
WorkingThreadCounts g_workingThreadCounts;
//
// If worker tracking is enabled (see above) then this is called immediately before and after a worker thread executes
// each work item.
//
void ThreadpoolMgr::ReportThreadStatus(bool isWorking)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
MODE_ANY;
}
CONTRACTL_END;
_ASSERTE(CLRConfig::GetConfigValue(CLRConfig::INTERNAL_ThreadPool_EnableWorkerTracking));
while (true)
{