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OtlThreadPool.pas
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///<summary>Thread pool. Part of the OmniThreadLibrary project.</summary>
///<author>Primoz Gabrijelcic</author>
///<license>
///This software is distributed under the BSD license.
///
///Copyright (c) 2011, Primoz Gabrijelcic
///All rights reserved.
///
///Redistribution and use in source and binary forms, with or without modification,
///are permitted provided that the following conditions are met:
///- Redistributions of source code must retain the above copyright notice, this
/// list of conditions and the following disclaimer.
///- Redistributions in binary form must reproduce the above copyright notice,
/// this list of conditions and the following disclaimer in the documentation
/// and/or other materials provided with the distribution.
///- The name of the Primoz Gabrijelcic may not be used to endorse or promote
/// products derived from this software without specific prior written permission.
///
///THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
///ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
///WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
///DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
///ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
///(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
///LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
///ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
///(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
///SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
///</license>
///<remarks><para>
/// Home : http://www.omnithreadlibrary.com
/// Support : https://plus.google.com/communities/112307748950248514961
/// Author : Primoz Gabrijelcic
/// E-Mail : primoz@gabrijelcic.org
/// Blog : http://thedelphigeek.com
/// Contributors : GJ, Lee_Nover, Sean B. Durkin
/// Creation date : 2008-06-12
/// Last modification : 2015-10-04
/// Version : 2.12
/// </para><para>
/// History:
/// 2.12: 2015-10-04
/// - Imported mobile support by [Sean].
/// 2.11: 2015-09-07
/// - Setting MinWorkers property will start up idle worker threads if total number
/// of threads managed by the thread pool is lower than the new value.
/// 2.10: 2015-09-03
/// - Removed limitation on max 60 threads in a pool (faciliated by changes in
/// OtlTaskControl).
/// 2.09a: 2012-01-31
/// - More accurate CountQueued.
/// 2.09: 2011-11-08
/// - Adapted to OtlCommon 1.24.
/// 2.08: 2011-11-06
/// - Sets thread name to 'Idle thread worker' when a thread is idle.
/// 2.07: 2011-07-14
/// - Exceptions are no longer reported through the OnPoolWorkItemCompleted event.
/// 2.06: 2011-07-04
/// - Fixed task exception handling. Exceptions are now reported through the
/// OnPoolWorkItemCompleted event.
/// 2.05b: 2010-11-25
/// - Bug fixed: Thread pool was immediately closing unused threads if MaxExecuting
/// was set to -1.
/// 2.05a: 2010-07-19
/// - Works correctly if MaxExecuting is set to 0. Set MaxExecuting to -1 to allow
/// "infinite" number of execution threads.
/// - When MaxExecuting is changed, the code checks immediately if tasks from the
/// idle queue can now be activated.
/// 2.05: 2010-07-01
/// - Includes OTLOptions.inc.
/// 2.04a: 2010-06-06
/// - Modified patch from 2.04 so that it's actually working.
/// 2.04: 2010-05-30
/// - ThreadDataFactory can now accept either a function or a method.
/// 2.03c: 2010-01-09
/// - Fixed CancelAll.
/// - Can be compiled with /dLogThreadPool.
/// 2.03b: 2009-12-12
/// - Fixed exception handling for silent exceptions.
/// 2.03a: 2009-11-17
/// - Task worker must not depend on monitor to be assigned.
/// - SetMonitor must be synchronous.
/// 2.02: 2009-11-13
/// - D2010 compatibility changes.
/// 2.01b: 2009-03-03
/// - Bug fixed: TOTPWorkerThread.Create was not waiting on the worker object to
/// initialize.
/// 2.01a: 2009-02-09
/// - Removed critical section added in 2.0b - it is not needed as the
/// IOmniTaskControl.Invoke is thread-safe.
/// 2.01: 2009-02-08
/// - Added support for per-thread data storage.
/// 2.0b: 2009-02-06
/// - Protect communication between TOmniThreadPool and TOTPWorker with a critical
/// section. That should allow multiple threads to Schedule tasks into one
/// thread pool.
/// 2.0a: 2009-02-06
/// - Removed OnWorkerThreadCreated_Asy/OnWorkerThreadDestroyed_Asy
/// notification mechanism which was pretty much useless.
/// 2.0: 2009-01-26
/// - Reimplemented using OmniThreadLibrary :)
/// 1.0: 2008-08-26
/// - First official release.
/// </para></remarks>
unit OtlThreadPool;
{$I OtlOptions.inc}
interface
// TODO 1 -oPrimoz Gabrijelcic : Should be monitorable by the OmniTaskEventDispatch
// TODO 3 -oPrimoz Gabrijelcic : Needs an async event reporting unexpected states (kill threads, for example)
// TODO 5 -oPrimoz Gabrijelcic : Loggers should (maybe) send log info to the event monitor
uses
{$IFDEF MSWINDOWS}
Windows,
{$ELSE}
Diagnostics,
{$ENDIF ~MSWINDOWS}
SysUtils,
OtlCommon,
OtlTask;
const
CDefaultIdleWorkerThreadTimeout_sec = 10;
CDefaultWaitOnTerminate_sec = 30;
type
IOmniThreadPool = interface;
IOmniThreadPoolMonitor = interface
['{09EFADE8-3F14-4184-87CA-131100EC57E4}']
function Detach(const task: IOmniThreadPool): IOmniThreadPool;
{$IFDEF MSWINDOWS}
function Monitor(const task: IOmniThreadPool): IOmniThreadPool;
{$ENDIF MSWINDOWS}
end; { IOmniThreadPoolMonitor }
TThreadPoolOperation = (tpoCreateThread, tpoDestroyThread, tpoKillThread,
tpoWorkItemCompleted);
TOmniThreadPoolMonitorInfo = class
strict private
otpmiTaskID : int64;
otpmiThreadID : integer;
otpmiThreadPoolOperation: TThreadPoolOperation;
otpmiUniqueID : int64;
public
constructor Create(uniqueID: int64; threadPoolOperation: TThreadPoolOperation;
threadID: integer); overload;
constructor Create(uniqueID, taskID: int64); overload;
property TaskID: int64 read otpmiTaskID;
property ThreadPoolOperation: TThreadPoolOperation read
otpmiThreadPoolOperation;
property ThreadID: integer read otpmiThreadID;
property UniqueID: int64 read otpmiUniqueID;
end; { TOmniThreadPoolMonitorInfo }
TOTPThreadDataFactoryFunction = function: IInterface;
TOTPThreadDataFactoryMethod = function: IInterface of object;
/// <summary>Worker thread lifetime reporting handler.</summary>
TOTPWorkerThreadEvent = procedure(Sender: TObject; threadID: TThreadID) of object;
IOmniThreadPool = interface
['{1FA74554-1866-46DD-AC50-F0403E378682}']
function GetIdleWorkerThreadTimeout_sec: integer;
function GetMaxExecuting: integer;
function GetMaxQueued: integer;
function GetMaxQueuedTime_sec: integer;
function GetMinWorkers: integer;
function GetName: string;
function GetUniqueID: int64;
function GetWaitOnTerminate_sec: integer;
procedure SetIdleWorkerThreadTimeout_sec(value: integer);
procedure SetMaxExecuting(value: integer);
procedure SetMaxQueued(value: integer); overload;
procedure SetMaxQueuedTime_sec(value: integer);
procedure SetMinWorkers(value: integer);
procedure SetName(const value: string);
procedure SetWaitOnTerminate_sec(value: integer);
//
function Cancel(taskID: int64): boolean;
procedure CancelAll;
function CountExecuting: integer;
function CountQueued: integer;
function IsIdle: boolean;
function MonitorWith(const monitor: IOmniThreadPoolMonitor): IOmniThreadPool;
function RemoveMonitor: IOmniThreadPool;
function SetMonitor(hWindow: THandle): IOmniThreadPool;
procedure SetThreadDataFactory(const value: TOTPThreadDataFactoryMethod); overload;
procedure SetThreadDataFactory(const value: TOTPThreadDataFactoryFunction); overload;
property IdleWorkerThreadTimeout_sec: integer read GetIdleWorkerThreadTimeout_sec
write SetIdleWorkerThreadTimeout_sec;
property MaxExecuting: integer read GetMaxExecuting write SetMaxExecuting;
property MaxQueued: integer read GetMaxQueued write SetMaxQueued;
property MaxQueuedTime_sec: integer read GetMaxQueuedTime_sec write
SetMaxQueuedTime_sec;
property MinWorkers: integer read GetMinWorkers write SetMinWorkers;
property Name: string read GetName write SetName;
property UniqueID: int64 read GetUniqueID;
property WaitOnTerminate_sec: integer read GetWaitOnTerminate_sec
write SetWaitOnTerminate_sec;
end; { IOmniThreadPool }
IOmniThreadPoolScheduler = interface
['{B7F5FFEF-2704-4CE0-ABF1-B20493E73650}']
procedure Schedule(const task: IOmniTask);
end; { IOmniThreadPoolScheduler }
function CreateThreadPool(const threadPoolName: string): IOmniThreadPool;
function GlobalOmniThreadPool: IOmniThreadPool;
implementation
uses
{$IFDEF MSWINDOWS}
Messages,
Contnrs,
DSiWin32,
GpStuff,
{$ENDIF}
SyncObjs,
Classes,
TypInfo,
{$IFDEF OTL_HasSystemTypes}
System.Types,
{$ENDIF}
{$IFNDEF Unicode} // D2009+ provides own TStringBuilder class
HVStringBuilder,
{$ENDIF}
OtlHooks,
OtlSync,
OtlComm,
OtlContainerObserver,
OtlTaskControl,
OtlEventMonitor,
Otl.Parallel.SynchroPrimitives.InterfaceLevel;
const
WM_REQUEST_COMPLETED = {$IFDEF MSWINDOWS}WM_USER{$ELSE}1000{$ENDIF};
MSG_RUN = 1;
MSG_THREAD_CREATED = 2;
MSG_THREAD_DESTROYING = 3;
MSG_COMPLETED = 4;
MSG_STOP = 5;
MSG_CANCEL_RESULT = 6;
type
{$IFNDEF Unicode}
TStringBuilder = HVStringBuilder.StringBuilder;
{$ENDIF}
TOTPWorkerThread = class;
TOmniThreadPool = class;
TOTPWorkItem = class
strict private
owiScheduled_ms: int64;
owiScheduledAt : TDateTime;
owiStartedAt : TDateTime;
owiTask : IOmniTask;
owiThread : TOTPWorkerThread;
owiUniqueID : int64;
public
constructor Create(const task: IOmniTask);
function Description: string;
procedure TerminateTask(exitCode: integer; const exitMessage: string);
property ScheduledAt: TDateTime read owiScheduledAt;
property Scheduled_ms: int64 read owiScheduled_ms;
property StartedAt: TDateTime read owiStartedAt write owiStartedAt;
property UniqueID: int64 read owiUniqueID;
property Task: IOmniTask read owiTask;
property Thread: TOTPWorkerThread read owiThread write owiThread;
end; { TOTPWorkItem }
TOTPThreadDataFactory = record
private
tdfExecutable: TOmniExecutable;
public
constructor Create(const a: TOTPThreadDataFactoryFunction); overload;
constructor Create(const a: TOTPThreadDataFactoryMethod); overload;
function Execute: IInterface; inline;
function IsEmpty: boolean; inline;
end; { TOTPThreadDataFactory }
TOTPWorkerThread = class(TThread)
strict private
owtCommChannel : IOmniTwoWayChannel;
owtNewWorkEvent : TOmniTransitionEvent;
owtRemoveFromPool : boolean;
owtStartIdle_ms : int64;
owtStartStopping_ms : int64;
owtStopped : boolean;
owtTerminateEvent : TOmniTransitionEvent;
owtThreadData : IInterface;
owtThreadDataFactory: TOTPThreadDataFactory;
owtWorkItemLock : IOmniCriticalSection;
owtWorkItem_ref : TOTPWorkItem;
strict protected
function Comm: IOmniCommunicationEndpoint;
procedure ExecuteWorkItem(workItem: TOTPWorkItem);
function GetOwnerCommEndpoint: IOmniCommunicationEndpoint;
procedure Log(const msg: string; const params: array of const);
public
constructor Create(const ThreadDataFactory: TOTPThreadDataFactory);
destructor Destroy; override;
procedure Asy_Stop;
function Asy_TerminateWorkItem(var workItem: TOTPWorkItem): boolean;
function Description: string;
procedure Execute; override;
function GetWorkItemInfo(var scheduledAt, startedAt: TDateTime;
var description: string): boolean;
function IsExecuting(taskID: int64): boolean;
procedure Start;
function WorkItemDescription: string;
property NewWorkEvent: TOmniTransitionEvent read owtNewWorkEvent;
property OwnerCommEndpoint: IOmniCommunicationEndpoint read GetOwnerCommEndpoint;
property RemoveFromPool: boolean read owtRemoveFromPool;
property StartIdle_ms: int64 read owtStartIdle_ms write owtStartIdle_ms;
property StartStopping_ms: int64 read owtStartStopping_ms
write owtStartStopping_ms; // always modified from the owner thread
property Stopped: boolean read owtStopped
write owtStopped; // always modified from the owner thread
property TerminateEvent: TOmniTransitionEvent read owtTerminateEvent;
property WorkItem_ref: TOTPWorkItem read owtWorkItem_ref
write owtWorkItem_ref; // address of the work item this thread is working on
end; { TOTPWorkerThread }
TOTPWorker = class(TOmniWorker)
strict private
owDestroying : boolean;
owIdleWorkers : TObjectList;
{$IFDEF MSWINDOWS}
owMonitorObserver : TOmniContainerWindowsMessageObserver;
{$ENDIF MSWINDOWS}
owName : string;
owRunningWorkers : TObjectList;
owStoppingWorkers : TObjectList;
owThreadDataFactory: TOTPThreadDataFactory;
owUniqueID : int64;
owWorkItemQueue : TObjectList;
strict protected
function ActiveWorkItemDescriptions: string;
function CreateWorker: TOTPWorkerThread;
procedure ForwardThreadCreated(threadID: TThreadID);
procedure ForwardThreadDestroying(threadID: TThreadID;
threadPoolOperation: TThreadPoolOperation; worker: TOTPWorkerThread = nil);
procedure InternalStop;
function LocateThread(threadID: DWORD): TOTPWorkerThread;
procedure Log(const msg: string; const params: array of const);
function NumRunningStoppedThreads: integer;
procedure ProcessCompletedWorkItem(workItem: TOTPWorkItem);
procedure RequestCompleted(workItem: TOTPWorkItem; worker: TOTPWorkerThread);
procedure ScheduleNext(workItem: TOTPWorkItem);
procedure StopThread(worker: TOTPWorkerThread);
protected
procedure Cleanup; override;
function Initialize: boolean; override;
public
CountQueued : TOmniAlignedInt32;
CountQueuedLock : TOmniCS;
CountRunning : TOmniAlignedInt32;
IdleWorkerThreadTimeout_sec: TOmniAlignedInt32;
MaxExecuting : TOmniAlignedInt32;
MaxQueued : TOmniAlignedInt32;
MaxQueuedTime_sec : TOmniAlignedInt32;
MinWorkers : TOmniAlignedInt32;
WaitOnTerminate_sec : TOmniAlignedInt32;
constructor Create(const name: string; uniqueID: int64);
published
// invoked from TOmniThreadPool
procedure Cancel(const params: TOmniValue);
procedure CancelAll(var doneSignal: TOmniWaitableValue);
procedure MaintainanceTimer;
// invoked from TOTPWorkerThreads
procedure CheckIdleQueue;
procedure MsgCompleted(var msg: TOmniMessage); {$IFDEF MSWINDOWS}message MSG_COMPLETED;{$ENDIF}
procedure MsgThreadCreated(var msg: TOmniMessage); {$IFDEF MSWINDOWS}message MSG_THREAD_CREATED;{$ENDIF}
procedure MsgThreadDestroying(var msg: TOmniMessage); {$IFDEF MSWINDOWS}message MSG_THREAD_DESTROYING;{$ENDIF}
procedure PruneWorkingQueue;
procedure RemoveMonitor;
procedure Schedule(var workItem: TOTPWorkItem);
procedure SetMonitor(const params: TOmniValue);
procedure SetName(const name: TOmniValue);
procedure SetThreadDataFactory(const threadDataFactory: TOmniValue);
end; { TOTPWorker }
TOTPThreadDataFactoryData = class
strict private
tdfdExecutable: TOTPThreadDataFactory;
public
constructor Create(const executable: TOTPThreadDataFactoryMethod); overload;
constructor Create(const executable: TOTPThreadDataFactoryFunction); overload;
property Executable: TOTPThreadDataFactory read tdfdExecutable;
end; { TOTPThreadDataFactoryData }
TOmniThreadPool = class(TInterfacedObject, IOmniThreadPool, IOmniThreadPoolScheduler)
strict private
otpPoolName : string;
otpThreadDataFactory: TOTPThreadDataFactory;
otpUniqueID : int64;
otpWorker : IOmniWorker;
otpWorkerTask : IOmniTaskControl;
strict protected
procedure Log(const msg: string; const params: array of const);
protected
function GetIdleWorkerThreadTimeout_sec: integer;
function GetMaxExecuting: integer;
function GetMaxQueued: integer;
function GetMaxQueuedTime_sec: integer;
function GetMinWorkers: integer;
function GetName: string;
function GetUniqueID: int64;
function GetWaitOnTerminate_sec: integer;
procedure SetIdleWorkerThreadTimeout_sec(value: integer);
procedure SetMaxExecuting(value: integer);
procedure SetMaxQueued(value: integer);
procedure SetMaxQueuedTime_sec(value: integer);
procedure SetMinWorkers(value: integer);
procedure SetName(const value: string);
procedure SetWaitOnTerminate_sec(value: integer);
function WorkerObj: TOTPWorker;
public
constructor Create(const name: string);
destructor Destroy; override;
function Cancel(taskID: int64): boolean;
procedure CancelAll;
function CountExecuting: integer;
function CountQueued: integer;
function IsIdle: boolean;
function MonitorWith(const monitor: IOmniThreadPoolMonitor): IOmniThreadPool;
function RemoveMonitor: IOmniThreadPool;
procedure Schedule(const task: IOmniTask);
function SetMonitor(hWindow: THandle): IOmniThreadPool;
procedure SetThreadDataFactory(const value: TOTPThreadDataFactoryMethod); overload;
procedure SetThreadDataFactory(const value: TOTPThreadDataFactoryFunction); overload;
property IdleWorkerThreadTimeout_sec: integer
read GetIdleWorkerThreadTimeout_sec write SetIdleWorkerThreadTimeout_sec;
property MaxExecuting: integer read GetMaxExecuting write SetMaxExecuting;
property MaxQueued: integer read GetMaxQueued write SetMaxQueued;
property MaxQueuedTime_sec: integer read GetMaxQueuedTime_sec
write SetMaxQueuedTime_sec;
property MinWorkers: integer read GetMinWorkers write SetMinWorkers;
property Name: string read GetName write SetName;
property UniqueID: int64 read GetUniqueID;
property WaitOnTerminate_sec: integer read GetWaitOnTerminate_sec write
SetWaitOnTerminate_sec;
end; { TOmniThreadPool }
const
CGlobalOmniThreadPoolName = 'GlobalOmniThreadPool';
var
GOmniThreadPool: IOmniThreadPool = nil;
{ exports }
function GlobalOmniThreadPool: IOmniThreadPool;
begin
if not assigned(GOmniThreadPool) then
GOmniThreadPool := CreateThreadPool(CGlobalOmniThreadPoolName);
Result := GOmniThreadPool;
end; { GlobalOmniThreadPool }
function CreateThreadPool(const threadPoolName: string): IOmniThreadPool;
begin
Result := TOmniThreadPool.Create(threadPoolName);
end; { CreateThreadPool }
{ TOmniThreadPoolMonitorInfo }
constructor TOmniThreadPoolMonitorInfo.Create(uniqueID: int64;
threadPoolOperation: TThreadPoolOperation; threadID: integer);
begin
otpmiUniqueID := uniqueID;
otpmiThreadPoolOperation := threadPoolOperation;
otpmiThreadID := threadID;
end; { TOmniThreadPoolMonitorInfo.Create }
constructor TOmniThreadPoolMonitorInfo.Create(uniqueID, taskID: int64);
begin
otpmiUniqueID := uniqueID;
otpmiThreadPoolOperation := tpoWorkItemCompleted;
otpmiTaskID := taskID;
end; { TOmniThreadPoolMonitorInfo.Create }
{ TOTPThreadDataFactory }
constructor TOTPThreadDataFactory.Create(const a: TOTPThreadDataFactoryFunction);
begin
tdfExecutable.Proc := TProcedure(a);
end; { TOTPThreadDataFactory.Create }
constructor TOTPThreadDataFactory.Create(const a: TOTPThreadDataFactoryMethod);
begin
tdfExecutable.Method := TMethod(a);
end; { TOTPThreadDataFactory.Create }
function TOTPThreadDataFactory.Execute: IInterface;
begin
case tdfExecutable.Kind of
oekProcedure:
Result := TOTPThreadDataFactoryFunction(tdfExecutable.Proc)();
oekMethod:
Result := TOTPThreadDataFactoryMethod(tdfExecutable.Method)();
else raise Exception.Create('TOTPThreadDataFactory.Execute: Not supported!');
end;
end; { TOTPThreadDataFactory.Execute }
function TOTPThreadDataFactory.IsEmpty: boolean;
begin
Result := tdfExecutable.IsNull;
end; { TOTPThreadDataFactory.IsEmpty }
{ TOTPWorkItem }
constructor TOTPWorkItem.Create(const task: IOmniTask);
begin
inherited Create;
owiTask := task;
owiScheduledAt := Now;
owiScheduled_ms := {$IFDEF MSWINDOWS} DSiTimeGetTime64 {$ELSE} TStopWatch.GetTimeStamp {$ENDIF};
owiUniqueID := owiTask.UniqueID;
end; { TOTPWorkItem.Create }
function TOTPWorkItem.Description: string;
begin
if assigned(Task) then
Result := Format('%s:%d', [Task.Name, UniqueID])
else
Result := Format(':%d', [UniqueID]);
end; { TOTPWorkItem.Description }
procedure TOTPWorkItem.TerminateTask(exitCode: integer; const exitMessage: string);
begin
if assigned(owiTask) then begin
owiTask.Enforced(false);
owiTask.SetExitStatus(exitCode, exitMessage);
owiTask.Terminate;
owiTask := nil;
end;
end; { TOTPWorkItem.TerminateTask }
{ TOTPWorkerThread }
constructor TOTPWorkerThread.Create(const ThreadDataFactory: TOTPThreadDataFactory);
begin
inherited Create(true);
{$IFDEF LogThreadPool}Log('Creating thread %s', [Description]);{$ENDIF LogThreadPool}
owtThreadDataFactory := ThreadDataFactory;
{$IFDEF MSWINDOWS}
owtNewWorkEvent := CreateEvent(nil, false, false, nil);
owtTerminateEvent := CreateEvent(nil, false, false, nil);
{$ELSE}
owtNewWorkEvent := CreateOmniEvent(false, false);
owtTerminateEvent := CreateOmniEvent(false, false);
{$ENDIF ~MSWINDOWS}
owtWorkItemLock := CreateOmniCriticalSection;
owtCommChannel := CreateTwoWayChannel(100, owtTerminateEvent);
end; { TOTPWorkerThread.Create }
destructor TOTPWorkerThread.Destroy;
begin
{$IFDEF LogThreadPool}Log('Destroying thread %s', [Description]);{$ENDIF LogThreadPool}
owtWorkItemLock := nil;
{$IFDEF MSWINDOWS}
DSiCloseHandleAndNull(owtTerminateEvent);
DSiCloseHandleAndNull(owtNewWorkEvent);
{$ELSE}
owtTerminateEvent := nil;
owtNewWorkEvent := nil;
{$ENDIF ~MSWINDOWS}
inherited Destroy;
end; { TOTPWorkerThread.Destroy }
/// <summary>Gently stop the worker thread.
procedure TOTPWorkerThread.Asy_Stop;
var
task: IOmniTask;
begin
{$IFDEF LogThreadPool}Log('Stop thread %s', [Description]);{$ENDIF LogThreadPool}
if assigned(owtWorkItemLock) then begin // Stop may be called during Cancel[All] and owtWorkItemLock may already be destroyed
owtWorkItemLock.Enter;
try
if assigned(WorkItem_ref) then begin
task := WorkItem_ref.task;
if assigned(task) then
task.Terminate;
end;
finally owtWorkItemLock.Leave end;
end;
end; { TOTPWorkerThread.Asy_Stop }
/// <summary>Take the work item ownership from the thread. Called asynchronously from the thread pool.</summary>
/// <returns>True if thread should be killed.</returns>
/// <since>2008-07-26</since>
function TOTPWorkerThread.Asy_TerminateWorkItem(var workItem: TOTPWorkItem): boolean;
begin
{$IFDEF LogThreadPool}Log('Asy_TerminateWorkItem thread %s', [Description]);{$ENDIF LogThreadPool}
Result := false;
owtWorkItemLock.Enter;
try
if assigned(WorkItem_ref) then begin
{$IFDEF LogThreadPool}Log('Thread %s has work item', [Description]);{$ENDIF LogThreadPool}
workItem := WorkItem_ref;
WorkItem_ref := nil;
if assigned(workItem) and assigned(workItem.task) and
(not workItem.task.Stopped) then
begin
workItem.TerminateTask(EXIT_THREADPOOL_CANCELLED, 'Cancelled');
Result := true;
end
else if assigned(workItem) then
Result := false;
end;
finally owtWorkItemLock.Leave; end;
end; { TOTPWorkerThread.Asy_TerminateWorkItem }
function TOTPWorkerThread.Comm: IOmniCommunicationEndpoint;
begin
Result := owtCommChannel.Endpoint1;
end; { TOTPWorkerThread.Comm }
function TOTPWorkerThread.Description: string;
begin
if not assigned(Self) then
Result := '<none>'
else
Result := Format('%p:%d', [pointer(Self), ThreadID]);
end; { TOTPWorkerThread.Description }
procedure TOTPWorkerThread.Execute;
var
msg: TOmniMessage;
begin
{$IFDEF LogThreadPool}Log('>>>Execute thread %s', [Description]);{$ENDIF LogThreadPool}
SendThreadNotifications(tntCreate, 'OtlThreadPool worker');
try
Comm.Send(MSG_THREAD_CREATED, threadID);
try
if owtThreadDataFactory.IsEmpty then
owtThreadData := nil
else
owtThreadData := owtThreadDataFactory.Execute;
while true do begin
if Comm.ReceiveWait(msg, INFINITE) then begin
case msg.MsgID of
MSG_RUN:
ExecuteWorkItem(TOTPWorkItem(msg.MsgData.AsObject));
MSG_STOP:
break; // while
else
raise Exception.CreateFmt(
'TOTPWorkerThread.Execute: Unexpected message %d', [msg.MsgID]);
end; // case
end; // if Comm.ReceiveWait
end; // while Comm.ReceiveWait()
finally Comm.Send(MSG_THREAD_DESTROYING, threadID); end;
finally SendThreadNotifications(tntDestroy, 'OtlThreadPool worker'); end;
{$IFDEF LogThreadPool}Log('<<<Execute thread %s', [Description]);{$ENDIF LogThreadPool}
end; { TOTPWorkerThread.Execute }
procedure TOTPWorkerThread.ExecuteWorkItem(workItem: TOTPWorkItem);
{$IFDEF LogThreadPool}
var
creationTime : TDateTime;
startKernelTime: int64;
startUserTime : int64;
stopKernelTime : int64;
stopUserTime : int64;
{$ENDIF LogThreadPool}
var
task: IOmniTask;
begin
WorkItem_ref := workItem;
task := WorkItem_ref.task;
try
{$IFDEF LogThreadPool}Log('Thread %s starting execution of %s', [Description, WorkItem_ref.Description]);
DSiGetThreadTimes(creationTime, startUserTime, startKernelTime); {$ENDIF LogThreadPool}
if assigned(task) then
with (task as IOmniTaskExecutor) do begin
SetThreadData(owtThreadData);
Execute;
end;
{$IFDEF LogThreadPool}DSiGetThreadTimes(creationTime, stopUserTime, stopKernelTime);
Log(
'Thread %s completed execution of %s; user time = %d ms, kernel time = %d ms',
[Description, WorkItem_ref.Description, Round
((stopUserTime - startUserTime) / 10000), Round
((stopKernelTime - startKernelTime) / 10000)]); {$ENDIF LogThreadPool}
finally task := nil; end;
if assigned(owtWorkItemLock) then owtWorkItemLock.Enter;
try
workItem := WorkItem_ref;
WorkItem_ref := nil;
if assigned(workItem) then begin // not already canceled
{$IFDEF LogThreadPool}Log(
'Thread %s sending notification of completed work item %s',
[Description, workItem.Description]); {$ENDIF LogThreadPool}
Comm.Send(MSG_COMPLETED, workItem);
end;
finally if assigned(owtWorkItemLock) then owtWorkItemLock.Leave; end;
SetThreadName('Idle thread worker');
end; { TOTPWorkerThread.ExecuteWorkItem }
function TOTPWorkerThread.GetOwnerCommEndpoint: IOmniCommunicationEndpoint;
begin
Result := owtCommChannel.Endpoint2;
end; { TOTPWorkerThread.GetOwnerCommEndpoint }
function TOTPWorkerThread.GetWorkItemInfo(var scheduledAt, startedAt: TDateTime;
var description: string): boolean;
begin
owtWorkItemLock.Enter;
try
if not assigned(WorkItem_ref) then
Result := false
else begin
scheduledAt := WorkItem_ref.scheduledAt;
startedAt := WorkItem_ref.startedAt;
description := WorkItem_ref.description;
UniqueString(description);
Result := true;
end;
finally owtWorkItemLock.Leave; end;
end; { TOTPWorkerThread.GetWorkItemInfo }
function TOTPWorkerThread.IsExecuting(taskID: int64): boolean;
begin
owtWorkItemLock.Enter;
try
Result := assigned(WorkItem_ref) and (WorkItem_ref.UniqueID = taskID);
finally owtWorkItemLock.Leave; end;
end; { TOTPWorkerThread.IsExecuting }
procedure TOTPWorkerThread.Log(const msg: string; const params: array of const);
begin
{$IFDEF LogThreadPool}
OutputDebugString(PChar(Format(msg, params)));
{$ENDIF LogThreadPool}
end; { TOTPWorkerThread.Log }
procedure TOTPWorkerThread.Start;
begin
{$IFDEF OTL_DeprecatedResume}
inherited Start;
{$ELSE}
inherited Resume;
{$ENDIF OTL_DeprecatedResume}
end; { TOTPWorkerThread.Start }
function TOTPWorkerThread.WorkItemDescription: string;
begin
owtWorkItemLock.Enter;
try
if assigned(WorkItem_ref) then
Result := WorkItem_ref.Description
else
Result := '';
finally owtWorkItemLock.Leave; end;
end; { TOTPWorkerThread.WorkItemDescription }
{ TOTPWorker }
constructor TOTPWorker.Create(const name: string; uniqueID: int64);
begin
inherited Create;
owName := name;
owUniqueID := uniqueID;
end; { TOTPWorker.Create }
function TOTPWorker.ActiveWorkItemDescriptions: string;
var
description : string;
iWorker : integer;
sbDescriptions: TStringBuilder;
ScheduledAt : TDateTime;
StartedAt : TDateTime;
worker : TOTPWorkerThread;
begin
sbDescriptions := TStringBuilder.Create;
try
for iWorker := 0 to owRunningWorkers.Count - 1 do begin
worker := TOTPWorkerThread(owRunningWorkers[iWorker]);
if worker.GetWorkItemInfo(ScheduledAt, StartedAt, description)
then
sbDescriptions.Append('[').Append(iWorker + 1).Append('] ').Append
(FormatDateTime('hh:nn:ss', ScheduledAt)).Append(' / ').Append
(FormatDateTime('hh:nn:ss', StartedAt)).Append(' ').Append
(description);
end;
Result := sbDescriptions.ToString;
finally FreeAndNil(sbDescriptions); end;
end; { TGpThreadPool.ActiveWorkItemDescriptions }
/// <returns>True: Normal exit, False: Thread was killed.</returns>
procedure TOTPWorker.Cancel(const params: TOmniValue);
var
endWait_ms : int64;
iWorker : integer;
taskID : int64;
waitParam : TOmniValue;
wasTerminated: boolean;
worker : TOTPWorkerThread;
workItem : TOTPWorkItem;
begin
taskID := params[0];
wasTerminated := true;
for iWorker := 0 to owRunningWorkers.Count - 1 do begin
worker := TOTPWorkerThread(owRunningWorkers[iWorker]);
if worker.IsExecuting(taskID) then begin
{$IFDEF LogThreadPool}Log('Cancel request %d on thread %p:%d', [taskID, pointer(worker), worker.threadID]); {$ENDIF LogThreadPool}
owRunningWorkers.Delete(iWorker);
worker.Asy_Stop;
endWait_ms := {$IFDEF MSWINDOWS} DSiTimeGetTime64 {$ELSE} TStopWatch.GetTimeStamp {$ENDIF} + int64(WaitOnTerminate_sec) * 1000;
while ({$IFDEF MSWINDOWS} DSiTimeGetTime64 {$ELSE} TStopWatch.GetTimeStamp {$ENDIF} < endWait_ms) and (not worker.Stopped) do begin
ProcessMessages;
Sleep(10);
end;
{$IFDEF MSWINDOWS}
SuspendThread(worker.Handle);
{$ELSE}
worker.Suspended := true;
{$ENDIF ~MSWINDOWS}
if worker.Asy_TerminateWorkItem(workItem) then begin
ProcessCompletedWorkItem(workItem);
{$IFDEF LogThreadPool}Log(
'Terminating unstoppable thread %s, num idle = %d, num running = %d[%d]',
[worker.Description, owIdleWorkers.Count, owRunningWorkers.Count,
MaxExecuting.Value]); {$ENDIF LogThreadPool}
{$IFDEF MSWINDOWS}
TerminateThread(worker.Handle, cardinal(-1));
{$ELSE}
worker.Terminate;
{$ENDIF ~MSWINDOWS}
ForwardThreadDestroying(worker.threadID, tpoKillThread, worker);
FreeAndNil(worker);
wasTerminated := false;
end
else begin
{$IFDEF MSWINDOWS}
ResumeThread(worker.Handle);
{$ELSE}
worker.Suspended := false;
{$ENDIF ~MSWINDOWS}
owIdleWorkers.Add(worker);
{$IFDEF LogThreadPool}Log(
'Thread %s moved to the idle list, num idle = %d, num running = %d[%d]',
[worker.Description, owIdleWorkers.Count, owRunningWorkers.Count,
MaxExecuting.Value]); {$ENDIF LogThreadPool}
end;
break; // for
end;
end; // for iWorker
waitParam := params[1];
(waitParam.AsObject as TOmniWaitableValue).Signal(wasTerminated);
end; { TOTPWorker.Cancel }
procedure TOTPWorker.CancelAll(var doneSignal: TOmniWaitableValue);
begin
InternalStop;
doneSignal.Signal;
end; { TOTPWorker.CancelAll }
procedure TOTPWorker.Cleanup;
begin
owDestroying := true;
InternalStop;
FreeAndNil(owStoppingWorkers);
FreeAndNil(owRunningWorkers);
FreeAndNil(owIdleWorkers);
FreeAndNil(owWorkItemQueue);
end; { TOTPWorker.Cleanup }
procedure TOTPWorker.ForwardThreadCreated(threadID: TThreadID);
begin
{$IFDEF MSWINDOWS}
if assigned(owMonitorObserver) then
owMonitorObserver.Send(COmniPoolMsg, 0, cardinal
(TOmniThreadPoolMonitorInfo.Create(owUniqueID, tpoCreateThread, threadID))
);
{$ENDIF MSWINDOWS}
end; { TOTPWorker.ForwardThreadCreated }
procedure TOTPWorker.ForwardThreadDestroying(threadID: TThreadID;
threadPoolOperation: TThreadPoolOperation; worker: TOTPWorkerThread);
begin
if not assigned(worker) then
worker := LocateThread(threadID);
if assigned(worker) then begin
task.UnregisterComm(worker.OwnerCommEndpoint);
worker.Stopped := true;
end;
{$IFDEF MSWINDOWS}
if assigned(owMonitorObserver) then
owMonitorObserver.Send(COmniPoolMsg, 0, cardinal
(TOmniThreadPoolMonitorInfo.Create(owUniqueID, threadPoolOperation,
threadID)));
{$ENDIF MSWINDOWS}
end; { TOTPWorker.ForwardThreadDestroying }
function TOTPWorker.Initialize: boolean;
begin
owIdleWorkers := TObjectList.Create(false);
owRunningWorkers := TObjectList.Create(false);
CountRunning.Value := 0;
owStoppingWorkers := TObjectList.Create(false);
owWorkItemQueue := TObjectList.Create(false);
CountQueued.Value := 0;
IdleWorkerThreadTimeout_sec.Value := CDefaultIdleWorkerThreadTimeout_sec;
WaitOnTerminate_sec.Value := CDefaultWaitOnTerminate_sec;
MaxExecuting.Value := Environment.Process.Affinity.Count;
Task.SetTimer(1, 1000, @TOTPWorker.MaintainanceTimer);
Result := true;
end; { TOTPWorker.Initialize }
procedure TOTPWorker.InternalStop;
var
endWait_ms: int64;
iWorker: integer;
iWorkItem: integer;
queuedItems: TObjectList { of TOTPWorkItem } ;
worker: TOTPWorkerThread;
workItem: TOTPWorkItem;
begin
{$IFDEF LogThreadPool}Log('Terminating queued tasks', []);{$ENDIF LogThreadPool}
queuedItems := TObjectList.Create(false);
try
for iWorkItem := 0 to owWorkItemQueue.Count - 1 do
queuedItems.Add(owWorkItemQueue[iWorkItem]);
owWorkItemQueue.Clear;
CountQueued.Value := 0;
for iWorkItem := 0 to queuedItems.Count - 1 do begin
workItem := TOTPWorkItem(queuedItems[iWorkItem]);
workItem.TerminateTask(EXIT_THREADPOOL_CANCELLED, 'Cancelled');
RequestCompleted(workItem, nil);
end; // for iWorkItem
finally FreeAndNil(queuedItems); end;
{$IFDEF LogThreadPool}Log('Stopping all threads', []); {$ENDIF LogThreadPool}
for iWorker := 0 to owIdleWorkers.Count - 1 do
StopThread(TOTPWorkerThread(owIdleWorkers[iWorker]));
owIdleWorkers.Clear;
for iWorker := 0 to owRunningWorkers.Count - 1 do
StopThread(TOTPWorkerThread(owRunningWorkers[iWorker]));
owRunningWorkers.Clear;
CountRunning.Value := 0;
endWait_ms := {$IFDEF MSWINDOWS} DSiTimeGetTime64 {$ELSE} TStopWatch.GetTimeStamp {$ENDIF} + int64(WaitOnTerminate_sec) * 1000;
while (endWait_ms > {$IFDEF MSWINDOWS} DSiTimeGetTime64 {$ELSE} TStopWatch.GetTimeStamp {$ENDIF}) and (NumRunningStoppedThreads > 0) do
begin
ProcessMessages;
// TODO 1 -oPrimoz Gabrijelcic : ! what happens here during CancelAll? can the task die? !
Sleep(10);
end;
for iWorker := 0 to owStoppingWorkers.Count - 1 do begin
worker := TOTPWorkerThread(owStoppingWorkers[iWorker]);
worker.Asy_TerminateWorkItem(workItem);
FreeAndNil(worker);
end;
owStoppingWorkers.Clear;
end; { TOTPWorker.InternalStop }
function TOTPWorker.LocateThread(threadID: DWORD): TOTPWorkerThread;
var
oThread: pointer;
begin
for oThread in owRunningWorkers do begin
Result := TOTPWorkerThread(oThread);
if Result.threadID = threadID then
Exit;
end;
for oThread in owIdleWorkers do begin
Result := TOTPWorkerThread(oThread);
if Result.threadID = threadID then
Exit;
end;
for oThread in owStoppingWorkers do begin
Result := TOTPWorkerThread(oThread);
if Result.threadID = threadID then
Exit;
end;
Result := nil;
end; { TOTPWorker.LocateThread }
procedure TOTPWorker.Log(const msg: string; const params: array of const );
begin
{$IFDEF LogThreadPool}
OutputDebugString(PChar(Format(msg, params)));
{$ENDIF LogThreadPool}
end; { TOTPWorker.Log }
procedure TOTPWorker.MaintainanceTimer;
var
iWorker: integer;
worker : TOTPWorkerThread;
begin
PruneWorkingQueue;