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1744 lines
45 KiB
1744 lines
45 KiB
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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worker.c
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Abstract:
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This module defines functions for the worker thread pool.
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Author:
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Gurdeep Singh Pall (gurdeep) Nov 13, 1997
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Revision History:
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lokeshs - extended/modified threadpool.
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Rob Earhart (earhart) September 29, 2000
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Split off from threads.c
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Environment:
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These routines are statically linked in the caller's executable
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and are callable only from user mode. They make use of Nt system
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services.
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--*/
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#include <ntos.h>
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#include <ntrtl.h>
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#include "ntrtlp.h"
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#include "threads.h"
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// Worker Thread Pool
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// ------------------
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// Clients can submit functions to be executed by a worker thread. Threads are
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// created if the work queue exceeds a threshold. Clients can request that the
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// function be invoked in the context of a I/O thread. I/O worker threads
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// can be used for initiating asynchronous I/O requests. They are not terminated if
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// there are pending IO requests. Worker threads terminate if inactivity exceeds a
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// threshold.
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// Clients can also associate IO completion requests with the IO completion port
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// waited upon by the non I/O worker threads. One should not post overlapped IO requests
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// in worker threads.
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ULONG StartedWorkerInitialization ; // Used for Worker thread startup synchronization
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ULONG CompletedWorkerInitialization ; // Used to check if Worker thread pool is initialized
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ULONG NumFutureWorkItems = 0 ; // Future work items (timers, waits, &c to exec in workers)
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ULONG NumFutureIOWorkItems = 0 ; // Future IO work items (timers, waits, &c to exec in IO workers)
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ULONG NumIOWorkerThreads ; // Count of IO Worker Threads alive
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ULONG NumWorkerThreads ; // Count of Worker Threads alive
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ULONG NumMinWorkerThreads ; // Min worker threads should be alive: 1 if ioCompletion used, else 0
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ULONG NumIOWorkRequests ; // Count of IO Work Requests pending
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ULONG NumLongIOWorkRequests ; // IO Worker threads executing long worker functions
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ULONG NumWorkRequests ; // Count of Work Requests pending.
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ULONG NumQueuedWorkRequests; // Count of work requests pending on IO completion
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ULONG NumLongWorkRequests ; // Worker threads executing long worker functions
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ULONG NumExecutingWorkerThreads ; // Worker threads currently executing worker functions
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ULONG TotalExecutedWorkRequests ; // Total worker requests that were picked up
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ULONG OldTotalExecutedWorkRequests ; // Total worker requests since last timeout.
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HANDLE WorkerThreadTimerQueue = NULL ; // Timer queue used by worker threads
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HANDLE WorkerThreadTimer = NULL ; // Timer used by worker threads
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RTL_CRITICAL_SECTION WorkerTimerCriticalSection; // Synchronizes access to the worker timer
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ULONG LastThreadCreationTickCount ; // Tick count at which the last thread was created
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LIST_ENTRY IOWorkerThreads ; // List of IOWorkerThreads
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PRTLP_IOWORKER_TCB PersistentIOTCB ; // ptr to TCB of persistest IO worker thread
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HANDLE WorkerCompletionPort ; // Completion port used for queuing tasks to Worker threads
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RTL_CRITICAL_SECTION WorkerCriticalSection ; // Exclusion used by worker threads
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NTSTATUS
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RtlpStartWorkerThread (
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VOID
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);
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VOID
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RtlpWorkerThreadCancelTimer(
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VOID
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)
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{
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if (! RtlTryEnterCriticalSection(&WorkerTimerCriticalSection)) {
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//
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// Either another thread is setting a timer, or clearing it.
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// Either way, there's no reason for us to clear the timer --
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// return immediately.
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//
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return;
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}
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__try {
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if (WorkerThreadTimer) {
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ASSERT(WorkerThreadTimerQueue);
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RtlDeleteTimer(WorkerThreadTimerQueue,
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WorkerThreadTimer,
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NULL);
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}
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} __finally {
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WorkerThreadTimer = NULL;
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RtlLeaveCriticalSection(&WorkerTimerCriticalSection);
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}
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}
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VOID
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RtlpWorkerThreadTimerCallback(
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PVOID Context,
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BOOLEAN NotUsed
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)
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/*++
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Routine Description:
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This routine checks if new worker thread has to be created
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Arguments:
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None
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Return Value:
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None
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--*/
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{
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IO_COMPLETION_BASIC_INFORMATION Info ;
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BOOLEAN bCreateThread = FALSE ;
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NTSTATUS Status ;
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ULONG QueueLength, Threshold, ShortWorkRequests ;
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Status = NtQueryIoCompletion(
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WorkerCompletionPort,
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IoCompletionBasicInformation,
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&Info,
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sizeof(Info),
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NULL
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) ;
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if (!NT_SUCCESS(Status))
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return ;
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QueueLength = Info.Depth ;
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if (!QueueLength) {
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OldTotalExecutedWorkRequests = TotalExecutedWorkRequests ;
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return ;
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}
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RtlEnterCriticalSection (&WorkerCriticalSection) ;
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// if there are queued work items and no new work items have been scheduled
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// in the last 30 seconds then create a new thread.
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// this will take care of deadlocks.
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// this will create a problem only if some thread is running for a long time
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if (TotalExecutedWorkRequests == OldTotalExecutedWorkRequests) {
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bCreateThread = TRUE ;
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}
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// if there are a lot of queued work items, then create a new thread
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{
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ULONG NumEffWorkerThreads = NumWorkerThreads > NumLongWorkRequests
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? NumWorkerThreads - NumLongWorkRequests
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: 0;
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ULONG ShortWorkRequests ;
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ULONG CapturedNumExecutingWorkerThreads;
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ULONG ThreadCreationDampingTime = NumWorkerThreads < NEW_THREAD_THRESHOLD
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? THREAD_CREATION_DAMPING_TIME1
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: (NumWorkerThreads < 30
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? THREAD_CREATION_DAMPING_TIME2
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: (NumWorkerThreads << 13)); // *100ms
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Threshold = (NumWorkerThreads < MAX_WORKER_THREADS
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? (NumEffWorkerThreads < 7
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? NumEffWorkerThreads*NumEffWorkerThreads
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: ((NumEffWorkerThreads<40)
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? NEW_THREAD_THRESHOLD * NumEffWorkerThreads
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: NEW_THREAD_THRESHOLD2 * NumEffWorkerThreads))
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: 0xffffffff) ;
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CapturedNumExecutingWorkerThreads = NumExecutingWorkerThreads;
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ShortWorkRequests = QueueLength + CapturedNumExecutingWorkerThreads > NumLongWorkRequests
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? QueueLength + CapturedNumExecutingWorkerThreads - NumLongWorkRequests
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: 0;
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if (LastThreadCreationTickCount > NtGetTickCount())
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LastThreadCreationTickCount = NtGetTickCount() ;
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if (ShortWorkRequests > Threshold
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&& (LastThreadCreationTickCount + ThreadCreationDampingTime
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< NtGetTickCount()))
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{
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bCreateThread = TRUE ;
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}
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}
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if (bCreateThread && NumWorkerThreads<MaxThreads) {
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RtlpStartWorkerThread();
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RtlpWorkerThreadCancelTimer();
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}
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OldTotalExecutedWorkRequests = TotalExecutedWorkRequests ;
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RtlLeaveCriticalSection (&WorkerCriticalSection) ;
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}
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NTSTATUS
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RtlpWorkerThreadSetTimer(
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VOID
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)
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{
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NTSTATUS Status;
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HANDLE NewTimerQueue;
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HANDLE NewTimer;
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Status = STATUS_SUCCESS;
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if (! RtlTryEnterCriticalSection(&WorkerTimerCriticalSection)) {
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//
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// Either another thread is setting a timer, or clearing it.
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// Either way, there's no reason for us to set the timer --
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// return immediately.
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//
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return STATUS_SUCCESS;
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}
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__try {
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if (! WorkerThreadTimerQueue) {
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Status = RtlCreateTimerQueue(&NewTimerQueue);
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if (! NT_SUCCESS(Status)) {
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__leave;
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}
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WorkerThreadTimerQueue = NewTimerQueue;
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}
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ASSERT(WorkerThreadTimerQueue != NULL);
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if (! WorkerThreadTimer) {
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Status = RtlCreateTimer(
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WorkerThreadTimerQueue,
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&NewTimer,
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RtlpWorkerThreadTimerCallback,
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NULL,
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60000,
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60000,
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WT_EXECUTEINTIMERTHREAD
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) ;
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if (! NT_SUCCESS(Status)) {
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__leave;
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}
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WorkerThreadTimer = NewTimer;
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}
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} __finally {
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RtlLeaveCriticalSection(&WorkerTimerCriticalSection);
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}
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return Status;
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}
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#if _MSC_FULL_VER >= 13008827
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#pragma warning(push)
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#pragma warning(disable:4715) // Not all control paths return (due to infinite loop)
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#endif
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LONG
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RtlpWorkerThread (
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PVOID Parameter
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)
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/*++
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Routine Description:
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All non I/O worker threads execute in this routine. Worker thread will try to
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terminate when it has not serviced a request for
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STARTING_WORKER_SLEEP_TIME +
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STARTING_WORKER_SLEEP_TIME << 1 +
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...
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STARTING_WORKER_SLEEP_TIME << MAX_WORKER_SLEEP_TIME_EXPONENT
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Arguments:
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HandlePtr - Pointer to our handle.
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N.B. This is closed by RtlpStartWorkerThread, but
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we're still responsible for the memory.
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Return Value:
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--*/
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{
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NTSTATUS Status ;
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PVOID WorkerProc ;
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PVOID Context ;
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IO_STATUS_BLOCK IoSb ;
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ULONG SleepTime ;
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LARGE_INTEGER TimeOut ;
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ULONG Terminate ;
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PVOID Overlapped ;
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UNREFERENCED_PARAMETER(Parameter);
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#if DBG
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DbgPrintEx(DPFLTR_RTLTHREADPOOL_ID,
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RTLP_THREADPOOL_TRACE_MASK,
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"Starting worker thread\n");
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#endif
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// Set default sleep time for 40 seconds.
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#define WORKER_IDLE_TIMEOUT 40000 // In Milliseconds
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SleepTime = WORKER_IDLE_TIMEOUT ;
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// Loop servicing I/O completion requests
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for ( ; ; ) {
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TimeOut.QuadPart = Int32x32To64( SleepTime, -10000 ) ;
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Status = NtRemoveIoCompletion(
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WorkerCompletionPort,
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(PVOID) &WorkerProc,
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&Overlapped,
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&IoSb,
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&TimeOut
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) ;
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if (Status == STATUS_SUCCESS) {
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TotalExecutedWorkRequests ++ ;//interlocked op not req
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InterlockedIncrement(&NumExecutingWorkerThreads) ;
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InterlockedDecrement(&NumQueuedWorkRequests);
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if (NumExecutingWorkerThreads == NumWorkerThreads
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&& NumQueuedWorkRequests > 0) {
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RtlpWorkerThreadSetTimer();
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}
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// Call the work item.
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// If IO APC, context1 contains number of IO bytes transferred, and context2
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// contains the overlapped structure.
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// If (IO)WorkerFunction, context1 contains the actual WorkerFunction to be
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// executed and context2 contains the actual context
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Context = (PVOID) IoSb.Information ;
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RtlpApcCallout(WorkerProc,
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IoSb.Status,
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Context,
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Overlapped);
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SleepTime = WORKER_IDLE_TIMEOUT ;
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InterlockedDecrement(&NumExecutingWorkerThreads) ;
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RtlpWorkerThreadCancelTimer();
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} else if (Status == STATUS_TIMEOUT) {
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// NtRemoveIoCompletion timed out. Check to see if have hit our limit
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// on waiting. If so terminate.
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Terminate = FALSE ;
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RtlEnterCriticalSection (&WorkerCriticalSection) ;
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// The thread terminates if there are > 1 threads and the queue is small
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// OR if there is only 1 thread and there is no request pending
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if (NumWorkerThreads > 1) {
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ULONG NumEffWorkerThreads = NumWorkerThreads > NumLongWorkRequests
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? NumWorkerThreads - NumLongWorkRequests
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: 0;
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if (NumEffWorkerThreads<=NumMinWorkerThreads) {
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Terminate = FALSE ;
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} else {
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//
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// have been idle for very long time. terminate irrespective of number of
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// work items. (This is useful when the set of runnable threads is taking
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// care of all the work items being queued). dont terminate if
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// (NumEffWorkerThreads == 1)
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//
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if (NumEffWorkerThreads > 1) {
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Terminate = TRUE ;
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} else {
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Terminate = FALSE ;
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}
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}
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} else {
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if ( NumMinWorkerThreads == 0
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&& NumWorkRequests == 0
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&& NumFutureWorkItems == 0) {
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Terminate = TRUE ;
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} else {
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Terminate = FALSE ;
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}
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}
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if (Terminate) {
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THREAD_BASIC_INFORMATION ThreadInfo;
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ULONG IsIoPending ;
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Terminate = FALSE ;
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Status = NtQueryInformationThread( NtCurrentThread(),
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ThreadIsIoPending,
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&IsIoPending,
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sizeof( IsIoPending ),
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NULL
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);
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if (NT_SUCCESS( Status )) {
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if (! IsIoPending )
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Terminate = TRUE ;
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}
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}
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if (Terminate) {
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ASSERT(NumWorkerThreads > 0);
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NumWorkerThreads--;
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RtlLeaveCriticalSection (&WorkerCriticalSection) ;
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RtlpExitThreadFunc( 0 );
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} else {
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// This is the condition where a request was queued *after* the
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// thread woke up - ready to terminate because of inactivity. In
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// this case dont terminate - service the completion port.
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RtlLeaveCriticalSection (&WorkerCriticalSection) ;
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}
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} else {
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ASSERTMSG ("NtRemoveIoCompletion failed",
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(Status != STATUS_SUCCESS) && (Status != STATUS_TIMEOUT)) ;
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}
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}
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return 1 ;
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}
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|
|
#if _MSC_FULL_VER >= 13008827
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#pragma warning(pop)
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#endif
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|
|
NTSTATUS
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RtlpStartWorkerThread (
|
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VOID
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)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine starts a regular worker thread
|
|
|
|
Arguments:
|
|
|
|
|
|
Return Value:
|
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|
|
NTSTATUS error codes resulting from attempts to create a thread
|
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STATUS_SUCCESS
|
|
|
|
--*/
|
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{
|
|
HANDLE ThreadHandle;
|
|
ULONG CurrentTickCount;
|
|
NTSTATUS Status;
|
|
|
|
// Create worker thread
|
|
|
|
Status = RtlpStartThreadpoolThread (RtlpWorkerThread,
|
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NULL,
|
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&ThreadHandle);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
#if DBG
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DbgPrintEx(DPFLTR_RTLTHREADPOOL_ID,
|
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RTLP_THREADPOOL_TRACE_MASK,
|
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"Created worker thread; handle %d (closing)\n",
|
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ThreadHandle);
|
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#endif
|
|
|
|
// We don't care about worker threads' handles.
|
|
NtClose(ThreadHandle);
|
|
|
|
// Update the time at which the current thread was created
|
|
|
|
LastThreadCreationTickCount = NtGetTickCount() ;
|
|
|
|
// Increment the count of the thread type created
|
|
|
|
NumWorkerThreads++;
|
|
|
|
} else {
|
|
|
|
#if DBG
|
|
DbgPrintEx(DPFLTR_RTLTHREADPOOL_ID,
|
|
RTLP_THREADPOOL_TRACE_MASK,
|
|
"Failed to create worker thread; status %p\n",
|
|
Status);
|
|
#endif
|
|
|
|
// Thread creation failed. If there is even one thread present do not return
|
|
// failure - else queue the request anyway.
|
|
|
|
if (NumWorkerThreads <= NumLongWorkRequests) {
|
|
|
|
return Status ;
|
|
}
|
|
|
|
}
|
|
|
|
return STATUS_SUCCESS ;
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlpInitializeWorkerThreadPool (
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine initializes all aspects of the thread pool.
|
|
|
|
Arguments:
|
|
|
|
None
|
|
|
|
Return Value:
|
|
|
|
None
|
|
|
|
--*/
|
|
{
|
|
NTSTATUS Status = STATUS_SUCCESS ;
|
|
LARGE_INTEGER TimeOut ;
|
|
SYSTEM_BASIC_INFORMATION BasicInfo;
|
|
|
|
|
|
// Initialize the timer component if it hasnt been done already
|
|
|
|
if (CompletedTimerInitialization != 1) {
|
|
|
|
Status = RtlpInitializeTimerThreadPool () ;
|
|
|
|
if ( !NT_SUCCESS(Status) )
|
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return Status ;
|
|
|
|
}
|
|
|
|
|
|
// In order to avoid an explicit RtlInitialize() function to initialize the thread pool
|
|
// we use StartedInitialization and CompletedInitialization to provide us the necessary
|
|
// synchronization to avoid multiple threads from initializing the thread pool.
|
|
// This scheme does not work if RtlInitializeCriticalSection() fails - but in this case the
|
|
// caller has no choices left.
|
|
|
|
if (!InterlockedExchange(&StartedWorkerInitialization, 1L)) {
|
|
|
|
if (CompletedWorkerInitialization)
|
|
InterlockedExchange( &CompletedWorkerInitialization, 0 ) ;
|
|
|
|
|
|
do {
|
|
|
|
// Initialize Critical Sections
|
|
|
|
Status = RtlInitializeCriticalSection( &WorkerCriticalSection );
|
|
if (!NT_SUCCESS(Status))
|
|
break ;
|
|
|
|
Status = RtlInitializeCriticalSection( &WorkerTimerCriticalSection );
|
|
if (! NT_SUCCESS(Status)) {
|
|
RtlDeleteCriticalSection( &WorkerCriticalSection );
|
|
break;
|
|
}
|
|
|
|
InitializeListHead (&IOWorkerThreads) ;
|
|
|
|
// get number of processors
|
|
|
|
Status = NtQuerySystemInformation (
|
|
SystemBasicInformation,
|
|
&BasicInfo,
|
|
sizeof(BasicInfo),
|
|
NULL
|
|
) ;
|
|
|
|
if ( !NT_SUCCESS(Status) ) {
|
|
BasicInfo.NumberOfProcessors = 1 ;
|
|
}
|
|
|
|
// Create completion port used by worker threads
|
|
|
|
Status = NtCreateIoCompletion (
|
|
&WorkerCompletionPort,
|
|
IO_COMPLETION_ALL_ACCESS,
|
|
NULL,
|
|
BasicInfo.NumberOfProcessors
|
|
);
|
|
|
|
if (!NT_SUCCESS(Status)) {
|
|
RtlDeleteCriticalSection( &WorkerCriticalSection );
|
|
RtlDeleteCriticalSection( &WorkerTimerCriticalSection );
|
|
break;
|
|
}
|
|
|
|
} while ( FALSE ) ;
|
|
|
|
if (!NT_SUCCESS(Status) ) {
|
|
|
|
StartedWorkerInitialization = 0 ;
|
|
InterlockedExchange( &CompletedWorkerInitialization, ~0 ) ;
|
|
return Status ;
|
|
}
|
|
|
|
// Signal that initialization has completed
|
|
|
|
InterlockedExchange (&CompletedWorkerInitialization, 1L) ;
|
|
|
|
} else {
|
|
|
|
LARGE_INTEGER Timeout ;
|
|
|
|
// Sleep 1 ms and see if the other thread has completed initialization
|
|
|
|
ONE_MILLISECOND_TIMEOUT(TimeOut) ;
|
|
|
|
while (!*((ULONG volatile *)&CompletedWorkerInitialization)) {
|
|
|
|
NtDelayExecution (FALSE, &TimeOut) ;
|
|
}
|
|
|
|
if (CompletedWorkerInitialization != 1)
|
|
return STATUS_NO_MEMORY ;
|
|
|
|
}
|
|
|
|
return NT_SUCCESS(Status) ? STATUS_SUCCESS : Status ;
|
|
}
|
|
|
|
LONG
|
|
RtlpIOWorkerThread (
|
|
PVOID Parameter
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
All I/O worker threads execute in this routine. All the work requests execute as APCs
|
|
in this thread.
|
|
|
|
Arguments:
|
|
|
|
HandlePtr - Pointer to our handle.
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
#define IOWORKER_IDLE_TIMEOUT 40000 // In Milliseconds
|
|
|
|
LARGE_INTEGER TimeOut ;
|
|
ULONG SleepTime = IOWORKER_IDLE_TIMEOUT ;
|
|
PRTLP_IOWORKER_TCB ThreadCB ; // Control Block allocated on the
|
|
// heap by the parent thread
|
|
NTSTATUS Status ;
|
|
BOOLEAN Terminate ;
|
|
|
|
ASSERT(Parameter != NULL);
|
|
|
|
ThreadCB = (PRTLP_IOWORKER_TCB) Parameter;
|
|
|
|
#if DBG
|
|
DbgPrintEx(DPFLTR_RTLTHREADPOOL_ID,
|
|
RTLP_THREADPOOL_TRACE_MASK,
|
|
"Starting IO worker thread\n");
|
|
#endif
|
|
|
|
// Sleep alertably so that all the activity can take place
|
|
// in APCs
|
|
|
|
for ( ; ; ) {
|
|
|
|
// Set timeout for IdleTimeout
|
|
|
|
TimeOut.QuadPart = Int32x32To64( SleepTime, -10000 ) ;
|
|
|
|
|
|
Status = NtDelayExecution (TRUE, &TimeOut) ;
|
|
|
|
|
|
// Status is STATUS_SUCCESS only when it has timed out
|
|
|
|
if (Status != STATUS_SUCCESS) {
|
|
continue ;
|
|
}
|
|
|
|
|
|
//
|
|
// idle timeout. check if you can terminate the thread
|
|
//
|
|
|
|
Terminate = FALSE ;
|
|
|
|
RtlEnterCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
|
|
// dont terminate if it is a persistent thread
|
|
|
|
if (ThreadCB->Flags & WT_EXECUTEINPERSISTENTIOTHREAD) {
|
|
|
|
TimeOut.LowPart = 0x0;
|
|
TimeOut.HighPart = 0x80000000;
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
continue ;
|
|
}
|
|
|
|
|
|
// The thread terminates if there are > 1 threads and the queue is small
|
|
// OR if there is only 1 thread and there is no request pending
|
|
|
|
if (NumIOWorkerThreads > 1) {
|
|
|
|
|
|
ULONG NumEffIOWorkerThreads = NumIOWorkerThreads > NumLongIOWorkRequests
|
|
? NumIOWorkerThreads - NumLongIOWorkRequests
|
|
: 0;
|
|
ULONG Threshold;
|
|
|
|
if (NumEffIOWorkerThreads == 0) {
|
|
|
|
Terminate = FALSE ;
|
|
|
|
} else {
|
|
|
|
// Check if we need to shrink worker thread pool
|
|
|
|
Threshold = NEW_THREAD_THRESHOLD * (NumEffIOWorkerThreads-1);
|
|
|
|
|
|
|
|
if (NumIOWorkRequests-NumLongIOWorkRequests < Threshold) {
|
|
|
|
Terminate = TRUE ;
|
|
|
|
} else {
|
|
|
|
Terminate = FALSE ;
|
|
SleepTime <<= 1 ;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
|
|
if (NumIOWorkRequests == 0
|
|
&& NumFutureIOWorkItems == 0) {
|
|
|
|
// delay termination of last thread
|
|
|
|
if (SleepTime < 4*IOWORKER_IDLE_TIMEOUT) {
|
|
|
|
SleepTime <<= 1 ;
|
|
Terminate = FALSE ;
|
|
|
|
} else {
|
|
|
|
Terminate = TRUE ;
|
|
}
|
|
|
|
} else {
|
|
|
|
Terminate = FALSE ;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
//
|
|
// terminate only if no io is pending
|
|
//
|
|
|
|
if (Terminate) {
|
|
|
|
NTSTATUS Status;
|
|
THREAD_BASIC_INFORMATION ThreadInfo;
|
|
ULONG IsIoPending ;
|
|
|
|
Terminate = FALSE ;
|
|
|
|
Status = NtQueryInformationThread( ThreadCB->ThreadHandle,
|
|
ThreadIsIoPending,
|
|
&IsIoPending,
|
|
sizeof( IsIoPending ),
|
|
NULL
|
|
);
|
|
if (NT_SUCCESS( Status )) {
|
|
|
|
if (! IsIoPending )
|
|
Terminate = TRUE ;
|
|
}
|
|
}
|
|
|
|
if (Terminate) {
|
|
|
|
ASSERT(NumIOWorkerThreads > 0);
|
|
NumIOWorkerThreads--;
|
|
|
|
RemoveEntryList (&ThreadCB->List) ;
|
|
NtClose( ThreadCB->ThreadHandle ) ;
|
|
RtlpFreeTPHeap( ThreadCB );
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
RtlpExitThreadFunc( 0 );
|
|
|
|
} else {
|
|
|
|
// This is the condition where a request was queued *after* the
|
|
// thread woke up - ready to terminate because of inactivity. In
|
|
// this case dont terminate - service the completion port.
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
}
|
|
}
|
|
|
|
return 0 ; // Keep compiler happy
|
|
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlpStartIOWorkerThread (
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine starts an I/O worker thread
|
|
|
|
N.B. Callers MUST hold the WorkerCriticalSection.
|
|
|
|
Arguments:
|
|
|
|
|
|
Return Value:
|
|
|
|
NTSTATUS error codes resulting from attempts to create a thread
|
|
STATUS_SUCCESS
|
|
|
|
--*/
|
|
{
|
|
ULONG CurrentTickCount ;
|
|
NTSTATUS Status ;
|
|
PRTLP_IOWORKER_TCB ThreadCB;
|
|
|
|
// Create the worker's control block
|
|
ThreadCB = (PRTLP_IOWORKER_TCB) RtlpAllocateTPHeap(sizeof(RTLP_IOWORKER_TCB), 0);
|
|
if (! ThreadCB) {
|
|
return STATUS_NO_MEMORY;
|
|
}
|
|
|
|
// Fill in the control block
|
|
ThreadCB->Flags = 0;
|
|
ThreadCB->LongFunctionFlag = FALSE;
|
|
|
|
// Create worker thread
|
|
|
|
Status = RtlpStartThreadpoolThread (RtlpIOWorkerThread,
|
|
ThreadCB,
|
|
&ThreadCB->ThreadHandle);
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
// Update the time at which the current thread was created,
|
|
// and insert the ThreadCB into the IO worker thread list.
|
|
|
|
LastThreadCreationTickCount = NtGetTickCount() ;
|
|
NumIOWorkerThreads++;
|
|
InsertHeadList(&IOWorkerThreads, &ThreadCB->List);
|
|
|
|
} else {
|
|
|
|
// Thread creation failed.
|
|
|
|
RtlpFreeTPHeap(ThreadCB);
|
|
|
|
// If there is even one thread present do not return
|
|
// failure since we can still service the work request.
|
|
|
|
if (NumIOWorkerThreads <= NumLongIOWorkRequests) {
|
|
|
|
return Status ;
|
|
|
|
}
|
|
}
|
|
|
|
return STATUS_SUCCESS ;
|
|
}
|
|
|
|
VOID
|
|
RtlpExecuteLongIOWorkItem (
|
|
PVOID Function,
|
|
PVOID Context,
|
|
PVOID ThreadCB
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Executes an IO Work function. RUNs in a APC in the IO Worker thread.
|
|
|
|
Arguments:
|
|
|
|
Function - Worker function to call
|
|
|
|
Context - Argument for the worker function.
|
|
|
|
NotUsed - Argument is not used in this function.
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
{
|
|
RtlpWorkerCallout(Function,
|
|
Context,
|
|
NULL,
|
|
NULL);
|
|
|
|
((PRTLP_IOWORKER_TCB)ThreadCB)->LongFunctionFlag = FALSE ;
|
|
|
|
RtlEnterCriticalSection(&WorkerCriticalSection);
|
|
|
|
// Decrement pending IO requests count
|
|
|
|
NumIOWorkRequests--;
|
|
|
|
// decrement pending long funcitons
|
|
|
|
NumLongIOWorkRequests--;
|
|
|
|
RtlLeaveCriticalSection(&WorkerCriticalSection);
|
|
}
|
|
|
|
VOID
|
|
RtlpExecuteIOWorkItem (
|
|
PVOID Function,
|
|
PVOID Context,
|
|
PVOID NotUsed
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Executes an IO Work function. RUNs in a APC in the IO Worker thread.
|
|
|
|
Arguments:
|
|
|
|
Function - Worker function to call
|
|
|
|
Context - Argument for the worker function.
|
|
|
|
NotUsed - Argument is not used in this function.
|
|
|
|
Return Value:
|
|
|
|
|
|
--*/
|
|
{
|
|
RtlpWorkerCallout(Function,
|
|
Context,
|
|
NULL,
|
|
NULL);
|
|
|
|
RtlEnterCriticalSection(&WorkerCriticalSection);
|
|
|
|
// Decrement pending IO requests count
|
|
|
|
NumIOWorkRequests--;
|
|
|
|
RtlLeaveCriticalSection(&WorkerCriticalSection);
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlpQueueIOWorkerRequest (
|
|
WORKERCALLBACKFUNC Function,
|
|
PVOID Context,
|
|
ULONG Flags
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine queues up the request to be executed in an IO worker thread.
|
|
|
|
Arguments:
|
|
|
|
Function - Routine that is called by the worker thread
|
|
|
|
Context - Opaque pointer passed in as an argument to WorkerProc
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status ;
|
|
PRTLP_IOWORKER_TCB TCB ;
|
|
BOOLEAN LongFunction = (Flags & WT_EXECUTELONGFUNCTION) ? TRUE : FALSE ;
|
|
PLIST_ENTRY ple ;
|
|
|
|
|
|
if (Flags & WT_EXECUTEINPERSISTENTIOTHREAD) {
|
|
|
|
if (!PersistentIOTCB) {
|
|
for (ple=IOWorkerThreads.Flink; ple!=&IOWorkerThreads; ple=ple->Flink) {
|
|
TCB = CONTAINING_RECORD (ple, RTLP_IOWORKER_TCB, List) ;
|
|
if (! TCB->LongFunctionFlag)
|
|
break;
|
|
}
|
|
|
|
if (ple == &IOWorkerThreads) {
|
|
return STATUS_NO_MEMORY;
|
|
}
|
|
|
|
|
|
PersistentIOTCB = TCB ;
|
|
TCB->Flags |= WT_EXECUTEINPERSISTENTIOTHREAD ;
|
|
|
|
} else {
|
|
TCB = PersistentIOTCB ;
|
|
}
|
|
|
|
} else {
|
|
for (ple=IOWorkerThreads.Flink; ple!=&IOWorkerThreads; ple=ple->Flink) {
|
|
|
|
TCB = CONTAINING_RECORD (ple, RTLP_IOWORKER_TCB, List) ;
|
|
|
|
// do not queue to the thread if it is executing a long function, or
|
|
// if you are queueing a long function and the thread is a persistent thread
|
|
|
|
if (! TCB->LongFunctionFlag
|
|
&& (! ((TCB->Flags&WT_EXECUTEINPERSISTENTIOTHREAD)
|
|
&& (Flags&WT_EXECUTELONGFUNCTION)))) {
|
|
break ;
|
|
}
|
|
|
|
}
|
|
|
|
if ((ple == &IOWorkerThreads) && (NumIOWorkerThreads<1)) {
|
|
|
|
#if DBG
|
|
DbgPrintEx(DPFLTR_RTLTHREADPOOL_ID,
|
|
RTLP_THREADPOOL_WARNING_MASK,
|
|
"Out of memory. "
|
|
"Could not execute IOWorkItem(%x)\n", (ULONG_PTR)Function);
|
|
#endif
|
|
|
|
return STATUS_NO_MEMORY;
|
|
}
|
|
else {
|
|
ple = IOWorkerThreads.Flink;
|
|
TCB = CONTAINING_RECORD (ple, RTLP_IOWORKER_TCB, List) ;
|
|
|
|
// treat it as a short function so that counters work fine.
|
|
|
|
LongFunction = FALSE;
|
|
}
|
|
|
|
// In order to implement "fair" assignment of work items between IO worker threads
|
|
// each time remove the entry and reinsert at back.
|
|
|
|
RemoveEntryList (&TCB->List) ;
|
|
InsertTailList (&IOWorkerThreads, &TCB->List) ;
|
|
}
|
|
|
|
|
|
// Increment the outstanding work request counter
|
|
|
|
NumIOWorkRequests++;
|
|
if (LongFunction) {
|
|
NumLongIOWorkRequests++;
|
|
TCB->LongFunctionFlag = TRUE ;
|
|
}
|
|
|
|
// Queue an APC to the IoWorker Thread
|
|
|
|
Status = NtQueueApcThread(
|
|
TCB->ThreadHandle,
|
|
LongFunction? (PPS_APC_ROUTINE)RtlpExecuteLongIOWorkItem:
|
|
(PPS_APC_ROUTINE)RtlpExecuteIOWorkItem,
|
|
(PVOID)Function,
|
|
Context,
|
|
TCB
|
|
);
|
|
|
|
if (! NT_SUCCESS( Status ) ) {
|
|
NumIOWorkRequests--;
|
|
if (LongFunction)
|
|
NumLongIOWorkRequests--;
|
|
}
|
|
|
|
return Status ;
|
|
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlSetIoCompletionCallback (
|
|
IN HANDLE FileHandle,
|
|
IN APC_CALLBACK_FUNCTION CompletionProc,
|
|
IN ULONG Flags
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine binds an Handle and an associated callback function to the
|
|
IoCompletionPort which queues work items to worker threads.
|
|
|
|
Arguments:
|
|
|
|
Handle - handle to be bound to the IO completion port
|
|
|
|
CompletionProc - callback function to be executed when an IO request
|
|
pending on the IO handle completes.
|
|
|
|
Flags - Reserved. pass 0.
|
|
|
|
--*/
|
|
|
|
{
|
|
IO_STATUS_BLOCK IoSb ;
|
|
FILE_COMPLETION_INFORMATION CompletionInfo ;
|
|
NTSTATUS Status;
|
|
|
|
if (LdrpShutdownInProgress) {
|
|
return STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
// Make sure that the worker thread pool is initialized as the file handle
|
|
// is bound to IO completion port.
|
|
|
|
if (CompletedWorkerInitialization != 1) {
|
|
|
|
Status = RtlpInitializeWorkerThreadPool () ;
|
|
|
|
if (! NT_SUCCESS(Status) )
|
|
return Status ;
|
|
|
|
}
|
|
|
|
|
|
//
|
|
// from now on NumMinWorkerThreads should be 1. If there is only 1 worker thread
|
|
// create a new one.
|
|
//
|
|
|
|
if ( NumMinWorkerThreads == 0 ) {
|
|
|
|
// Take lock for the global worker thread pool
|
|
|
|
RtlEnterCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
if ((NumWorkerThreads-NumLongWorkRequests) == 0) {
|
|
|
|
Status = RtlpStartWorkerThread () ;
|
|
|
|
if ( ! NT_SUCCESS(Status) ) {
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
return Status ;
|
|
}
|
|
}
|
|
|
|
// from now on, there will be at least 1 worker thread
|
|
NumMinWorkerThreads = 1 ;
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
}
|
|
|
|
// bind to IoCompletionPort, which queues work items to worker threads
|
|
|
|
CompletionInfo.Port = WorkerCompletionPort ;
|
|
CompletionInfo.Key = (PVOID) CompletionProc ;
|
|
|
|
Status = NtSetInformationFile (
|
|
FileHandle,
|
|
&IoSb, //not initialized
|
|
&CompletionInfo,
|
|
sizeof(CompletionInfo),
|
|
FileCompletionInformation //enum flag
|
|
) ;
|
|
return Status ;
|
|
}
|
|
|
|
VOID
|
|
RtlpExecuteWorkerRequest (
|
|
NTSTATUS StatusIn, //not used
|
|
PVOID Context,
|
|
PVOID WorkContext
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine executes a work item.
|
|
|
|
Arguments:
|
|
|
|
Context - contains context to be passed to the callback function.
|
|
|
|
WorkContext - contains callback function ptr and flags
|
|
|
|
Return Value:
|
|
|
|
Notes:
|
|
This function executes in a worker thread or a timer thread if
|
|
WT_EXECUTEINTIMERTHREAD flag is set.
|
|
|
|
--*/
|
|
|
|
{
|
|
PRTLP_WORK WorkEntry = (PRTLP_WORK) WorkContext;
|
|
NTSTATUS Status;
|
|
|
|
RtlpWorkerCallout(WorkEntry->Function,
|
|
Context,
|
|
WorkEntry->ActivationContext,
|
|
WorkEntry->ImpersonationToken);
|
|
|
|
RtlEnterCriticalSection(&WorkerCriticalSection);
|
|
NumWorkRequests--;
|
|
if (WorkEntry->Flags & WT_EXECUTELONGFUNCTION) {
|
|
NumLongWorkRequests--;
|
|
}
|
|
RtlLeaveCriticalSection(&WorkerCriticalSection);
|
|
|
|
if (WorkEntry->ActivationContext != INVALID_ACTIVATION_CONTEXT)
|
|
RtlReleaseActivationContext(WorkEntry->ActivationContext);
|
|
|
|
if (WorkEntry->ImpersonationToken) {
|
|
NtClose(WorkEntry->ImpersonationToken);
|
|
}
|
|
|
|
RtlpFreeTPHeap( WorkEntry ) ;
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlpQueueWorkerRequest (
|
|
WORKERCALLBACKFUNC Function,
|
|
PVOID Context,
|
|
ULONG Flags
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine queues up the request to be executed in a worker thread.
|
|
|
|
Arguments:
|
|
|
|
Function - Routine that is called by the worker thread
|
|
|
|
Context - Opaque pointer passed in as an argument to WorkerProc
|
|
|
|
Flags - flags passed to RtlQueueWorkItem
|
|
|
|
Return Value:
|
|
|
|
--*/
|
|
|
|
{
|
|
NTSTATUS Status ;
|
|
PRTLP_WORK WorkEntry ;
|
|
|
|
WorkEntry = (PRTLP_WORK) RtlpAllocateTPHeap ( sizeof (RTLP_WORK),
|
|
HEAP_ZERO_MEMORY) ;
|
|
|
|
if (! WorkEntry) {
|
|
return STATUS_NO_MEMORY;
|
|
}
|
|
|
|
if (NtCurrentTeb()->IsImpersonating) {
|
|
Status = NtOpenThreadToken(NtCurrentThread(),
|
|
MAXIMUM_ALLOWED,
|
|
TRUE,
|
|
&WorkEntry->ImpersonationToken);
|
|
if (! NT_SUCCESS(Status)) {
|
|
RtlpFreeTPHeap(WorkEntry);
|
|
return Status;
|
|
}
|
|
} else {
|
|
WorkEntry->ImpersonationToken = NULL;
|
|
}
|
|
|
|
Status = RtlpThreadPoolGetActiveActivationContext(&WorkEntry->ActivationContext);
|
|
if (!NT_SUCCESS(Status)) {
|
|
if (Status == STATUS_SXS_THREAD_QUERIES_DISABLED) {
|
|
WorkEntry->ActivationContext = INVALID_ACTIVATION_CONTEXT;
|
|
Status = STATUS_SUCCESS;
|
|
} else {
|
|
if (WorkEntry->ImpersonationToken) {
|
|
NtClose(WorkEntry->ImpersonationToken);
|
|
}
|
|
RtlpFreeTPHeap(WorkEntry);
|
|
return Status;
|
|
}
|
|
}
|
|
|
|
// Increment the outstanding work request counter
|
|
|
|
NumWorkRequests++;
|
|
if (Flags & WT_EXECUTELONGFUNCTION) {
|
|
NumLongWorkRequests++;
|
|
}
|
|
|
|
WorkEntry->Function = Function ;
|
|
WorkEntry->Flags = Flags ;
|
|
|
|
if (Flags & WT_EXECUTEINPERSISTENTTHREAD) {
|
|
|
|
// Queue APC to timer thread
|
|
|
|
Status = NtQueueApcThread(
|
|
TimerThreadHandle,
|
|
(PPS_APC_ROUTINE)RtlpExecuteWorkerRequest,
|
|
(PVOID) STATUS_SUCCESS,
|
|
(PVOID) Context,
|
|
(PVOID) WorkEntry
|
|
) ;
|
|
|
|
} else {
|
|
|
|
InterlockedIncrement(&NumQueuedWorkRequests);
|
|
|
|
Status = NtSetIoCompletion (
|
|
WorkerCompletionPort,
|
|
RtlpExecuteWorkerRequest,
|
|
(PVOID) WorkEntry,
|
|
STATUS_SUCCESS,
|
|
(ULONG_PTR)Context
|
|
);
|
|
if (! NT_SUCCESS(Status)) {
|
|
InterlockedDecrement(&NumQueuedWorkRequests);
|
|
}
|
|
}
|
|
|
|
if ( ! NT_SUCCESS(Status) ) {
|
|
NumWorkRequests--;
|
|
if (Flags & WT_EXECUTELONGFUNCTION) {
|
|
NumLongWorkRequests--;
|
|
}
|
|
|
|
if (WorkEntry->ActivationContext != INVALID_ACTIVATION_CONTEXT)
|
|
RtlReleaseActivationContext(WorkEntry->ActivationContext);
|
|
|
|
if (WorkEntry->ImpersonationToken) {
|
|
NtClose(WorkEntry->ImpersonationToken);
|
|
}
|
|
|
|
RtlpFreeTPHeap( WorkEntry ) ;
|
|
}
|
|
|
|
return Status ;
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlQueueWorkItem(
|
|
IN WORKERCALLBACKFUNC Function,
|
|
IN PVOID Context,
|
|
IN ULONG Flags
|
|
)
|
|
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine queues up the request to be executed in a worker thread.
|
|
|
|
Arguments:
|
|
|
|
Function - Routine that is called by the worker thread
|
|
|
|
Context - Opaque pointer passed in as an argument to WorkerProc
|
|
|
|
Flags - Can be:
|
|
|
|
WT_EXECUTEINIOTHREAD - Specifies that the WorkerProc should be invoked
|
|
by a thread that is never destroyed when there are pending IO requests.
|
|
This can be used by threads that invoke I/O and/or schedule APCs.
|
|
|
|
The below flag can also be set:
|
|
WT_EXECUTELONGFUNCTION - Specifies that the function might block for a
|
|
long duration.
|
|
|
|
Return Value:
|
|
|
|
STATUS_SUCCESS - Queued successfully.
|
|
|
|
STATUS_NO_MEMORY - There was not sufficient heap to perform the
|
|
requested operation.
|
|
|
|
--*/
|
|
|
|
{
|
|
ULONG Threshold ;
|
|
ULONG CurrentTickCount ;
|
|
NTSTATUS Status = STATUS_SUCCESS ;
|
|
|
|
if (LdrpShutdownInProgress) {
|
|
return STATUS_UNSUCCESSFUL;
|
|
}
|
|
|
|
// Make sure the worker thread pool is initialized
|
|
|
|
if (CompletedWorkerInitialization != 1) {
|
|
|
|
Status = RtlpInitializeWorkerThreadPool () ;
|
|
|
|
if (! NT_SUCCESS(Status) )
|
|
return Status ;
|
|
}
|
|
|
|
|
|
// Take lock for the global worker thread pool
|
|
|
|
RtlEnterCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
if (Flags&0xffff0000) {
|
|
MaxThreads = (Flags & 0xffff0000)>>16;
|
|
}
|
|
|
|
if (NEEDS_IO_THREAD(Flags)) {
|
|
|
|
//
|
|
// execute in IO Worker thread
|
|
//
|
|
|
|
ULONG NumEffIOWorkerThreads = NumIOWorkerThreads > NumLongIOWorkRequests
|
|
? NumIOWorkerThreads - NumLongIOWorkRequests
|
|
: 0;
|
|
|
|
ULONG ThreadCreationDampingTime = NumIOWorkerThreads < NEW_THREAD_THRESHOLD
|
|
? THREAD_CREATION_DAMPING_TIME1
|
|
: THREAD_CREATION_DAMPING_TIME2 ;
|
|
|
|
if (NumEffIOWorkerThreads && PersistentIOTCB && (Flags&WT_EXECUTELONGFUNCTION))
|
|
NumEffIOWorkerThreads -- ;
|
|
|
|
|
|
// Check if we need to grow I/O worker thread pool
|
|
|
|
Threshold = (NumEffIOWorkerThreads < MAX_WORKER_THREADS
|
|
? NEW_THREAD_THRESHOLD * NumEffIOWorkerThreads
|
|
: 0xffffffff) ;
|
|
|
|
if (LastThreadCreationTickCount > NtGetTickCount())
|
|
LastThreadCreationTickCount = NtGetTickCount() ;
|
|
|
|
if (NumEffIOWorkerThreads == 0
|
|
|| ((NumIOWorkRequests - NumLongIOWorkRequests > Threshold)
|
|
&& (LastThreadCreationTickCount + ThreadCreationDampingTime
|
|
< NtGetTickCount()))) {
|
|
|
|
// Grow the IO worker thread pool
|
|
|
|
Status = RtlpStartIOWorkerThread () ;
|
|
|
|
}
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
// Queue the work request
|
|
|
|
Status = RtlpQueueIOWorkerRequest (Function, Context, Flags) ;
|
|
}
|
|
|
|
|
|
} else {
|
|
|
|
//
|
|
// execute in regular worker thread
|
|
//
|
|
|
|
ULONG NumEffWorkerThreads = NumWorkerThreads > NumLongWorkRequests
|
|
? NumWorkerThreads - NumLongWorkRequests
|
|
: 0;
|
|
ULONG ThreadCreationDampingTime = NumWorkerThreads < NEW_THREAD_THRESHOLD
|
|
? THREAD_CREATION_DAMPING_TIME1
|
|
: (NumWorkerThreads < 30
|
|
? THREAD_CREATION_DAMPING_TIME2
|
|
: NumWorkerThreads << 13);
|
|
|
|
// if io completion set, then have 1 more thread
|
|
|
|
if (NumMinWorkerThreads && NumEffWorkerThreads)
|
|
NumEffWorkerThreads -- ;
|
|
|
|
|
|
// Check if we need to grow worker thread pool
|
|
|
|
Threshold = (NumWorkerThreads < MAX_WORKER_THREADS
|
|
? (NumEffWorkerThreads < 7
|
|
? NumEffWorkerThreads*NumEffWorkerThreads
|
|
: ((NumEffWorkerThreads<40)
|
|
? NEW_THREAD_THRESHOLD * NumEffWorkerThreads
|
|
: NEW_THREAD_THRESHOLD2 * NumEffWorkerThreads))
|
|
: 0xffffffff) ;
|
|
|
|
if (LastThreadCreationTickCount > NtGetTickCount())
|
|
LastThreadCreationTickCount = NtGetTickCount() ;
|
|
|
|
if (NumEffWorkerThreads == 0 ||
|
|
( (NumWorkRequests - NumLongWorkRequests >= Threshold)
|
|
&& (LastThreadCreationTickCount + ThreadCreationDampingTime
|
|
< NtGetTickCount())))
|
|
{
|
|
// Grow the worker thread pool
|
|
if (NumWorkerThreads<MaxThreads) {
|
|
|
|
Status = RtlpStartWorkerThread () ;
|
|
|
|
}
|
|
}
|
|
|
|
// Queue the work request
|
|
|
|
if (NT_SUCCESS(Status)) {
|
|
|
|
Status = RtlpQueueWorkerRequest (Function, Context, Flags) ;
|
|
}
|
|
|
|
}
|
|
|
|
// Release lock on the worker thread pool
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
return Status ;
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlpWorkerCleanup(
|
|
VOID
|
|
)
|
|
{
|
|
PLIST_ENTRY Node;
|
|
ULONG i;
|
|
HANDLE TmpHandle;
|
|
BOOLEAN Cleanup;
|
|
|
|
IS_COMPONENT_INITIALIZED( StartedWorkerInitialization,
|
|
CompletedWorkerInitialization,
|
|
Cleanup ) ;
|
|
|
|
if ( Cleanup ) {
|
|
|
|
RtlEnterCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
if ( (NumWorkRequests != 0) || (NumIOWorkRequests != 0) ) {
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
return STATUS_UNSUCCESSFUL ;
|
|
}
|
|
|
|
// queue a cleanup for each worker thread
|
|
|
|
for (i = 0 ; i < NumWorkerThreads ; i ++ ) {
|
|
|
|
NtSetIoCompletion (
|
|
WorkerCompletionPort,
|
|
RtlpThreadCleanup,
|
|
NULL,
|
|
STATUS_SUCCESS,
|
|
0
|
|
);
|
|
}
|
|
|
|
// queue an apc to cleanup all IO worker threads
|
|
|
|
for (Node = IOWorkerThreads.Flink ; Node != &IOWorkerThreads ;
|
|
Node = Node->Flink )
|
|
{
|
|
PRTLP_IOWORKER_TCB ThreadCB ;
|
|
|
|
ThreadCB = CONTAINING_RECORD (Node, RTLP_IOWORKER_TCB, List) ;
|
|
RemoveEntryList( &ThreadCB->List) ;
|
|
TmpHandle = ThreadCB->ThreadHandle ;
|
|
|
|
NtQueueApcThread(
|
|
ThreadCB->ThreadHandle,
|
|
(PPS_APC_ROUTINE)RtlpThreadCleanup,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
);
|
|
|
|
NtClose( TmpHandle ) ;
|
|
}
|
|
|
|
NumWorkerThreads = NumIOWorkerThreads = 0 ;
|
|
|
|
RtlLeaveCriticalSection (&WorkerCriticalSection) ;
|
|
|
|
}
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlpThreadPoolGetActiveActivationContext(
|
|
PACTIVATION_CONTEXT* ActivationContext
|
|
)
|
|
{
|
|
ACTIVATION_CONTEXT_BASIC_INFORMATION ActivationContextInfo = {0};
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
|
|
ASSERT(ActivationContext != NULL);
|
|
*ActivationContext = NULL;
|
|
|
|
Status =
|
|
RtlQueryInformationActivationContext(
|
|
RTL_QUERY_INFORMATION_ACTIVATION_CONTEXT_FLAG_USE_ACTIVE_ACTIVATION_CONTEXT,
|
|
NULL,
|
|
0,
|
|
ActivationContextBasicInformation,
|
|
&ActivationContextInfo,
|
|
sizeof(ActivationContextInfo),
|
|
NULL);
|
|
if (!NT_SUCCESS(Status)) {
|
|
goto Exit;
|
|
}
|
|
if ((ActivationContextInfo.Flags & ACTIVATION_CONTEXT_FLAG_NO_INHERIT) != 0) {
|
|
RtlReleaseActivationContext(ActivationContextInfo.ActivationContext);
|
|
ActivationContextInfo.ActivationContext = NULL;
|
|
// fall through
|
|
}
|
|
*ActivationContext = ActivationContextInfo.ActivationContext;
|
|
Status = STATUS_SUCCESS;
|
|
Exit:
|
|
return Status;
|
|
}
|
|
|
|
NTSTATUS
|
|
RtlpAcquireWorker(ULONG Flags)
|
|
{
|
|
NTSTATUS Status = STATUS_SUCCESS;
|
|
|
|
if (CompletedWorkerInitialization != 1) {
|
|
Status = RtlpInitializeWorkerThreadPool () ;
|
|
|
|
if (! NT_SUCCESS(Status) )
|
|
return Status ;
|
|
}
|
|
|
|
if (NEEDS_IO_THREAD(Flags)) {
|
|
RtlEnterCriticalSection(&WorkerCriticalSection);
|
|
InterlockedIncrement(&NumFutureIOWorkItems);
|
|
if (NumIOWorkerThreads == 0) {
|
|
Status = RtlpStartIOWorkerThread();
|
|
}
|
|
RtlLeaveCriticalSection(&WorkerCriticalSection);
|
|
} else {
|
|
RtlEnterCriticalSection(&WorkerCriticalSection);
|
|
InterlockedIncrement(&NumFutureWorkItems);
|
|
if (NumWorkerThreads == 0) {
|
|
Status = RtlpStartWorkerThread();
|
|
}
|
|
RtlLeaveCriticalSection(&WorkerCriticalSection);
|
|
}
|
|
|
|
return Status;
|
|
}
|
|
|
|
VOID
|
|
RtlpReleaseWorker(ULONG Flags)
|
|
{
|
|
if (NEEDS_IO_THREAD(Flags)) {
|
|
ASSERT(NumFutureIOWorkItems > 0);
|
|
InterlockedDecrement(&NumFutureIOWorkItems);
|
|
} else {
|
|
ASSERT(NumFutureWorkItems > 0);
|
|
InterlockedDecrement(&NumFutureWorkItems);
|
|
}
|
|
}
|