delphi - 如何在TThread中设置堆栈大小？

Question

如何在 TThread 中设置自定义堆栈大小？我正在尝试重新引入 TThread 的构造函数，但它说 ThreadProc 丢失，但它就在 System.Classes 中。

type
  TThreadHelper = class helper for TThread
    constructor Create(const CreateSuspended: Boolean = False; const StackSize: Integer = 0); reintroduce;
 end;

{ TThreadHelper }

constructor TThreadHelper.Create(const CreateSuspended: Boolean; const StackSize: Integer);
begin
  Self.FSuspended := not Self.FExternalThread;
  Self.FCreateSuspended := CreateSuspended and not Self.FExternalThread;
  if not Self.FExternalThread then
  begin
    Self.FHandle := BeginThread(nil, StackSize, @ThreadProc, Pointer(Self), CREATE_SUSPENDED, Self.FThreadID);
    if Self.FHandle = 0 then
    raise EThread.CreateResFmt(@SThreadCreateError, [SysErrorMessage(GetLastError)]);
  end
  else
  begin
    Self.FHandle := Winapi.Windows.GetCurrentThread;
    Self.FThreadId := GetCurrentThreadId;
  end;
end;

[dcc32 Error] Project5.dpr(29): E2003 Undeclared identifier: 'ThreadProc'

Answer 1

我不知道，是否可以在创建线程后设置堆栈大小。也许SetThreadStackGuarantee有帮助吗？

您可以使用BeginThread从头开始创建线程，但它相当复杂。我这里有一个使用Detours的解决方法。请注意，有多种 Detours 变体。我认为只有 Cromis.Detours 兼容 x64。

unit IndividualStackSizeForThread;

interface

uses 
  System.Classes,
  Cromis.Detours { http://www.cromis.net/blog/downloads/cromis-ipc/ };

type
  TThreadHelper = class helper for TThread
    constructor Create(CreateSuspended: Boolean; StackSize: LongWord);
 end;

implementation

var
  TrampolineBeginThread: function(SecurityAttributes: Pointer; StackSize: LongWord;
    ThreadFunc: TThreadFunc; Parameter: Pointer; CreationFlags: LongWord; 
    var ThreadId: TThreadID): THandle = nil;

threadvar
  StackSizeOverride: LongWord;

function InterceptBeginThread(SecurityAttributes: Pointer; StackSize: LongWord;
  ThreadFunc: TThreadFunc; Parameter: Pointer; CreationFlags: LongWord;
  var ThreadId: TThreadID): THandle;
const
  STACK_SIZE_PARAM_IS_A_RESERVATION = $00010000; // http://msdn.microsoft.com/en-us/library/windows/desktop/ms682453(v=vs.85).aspx
begin
  if StackSizeOverride <> 0 then
  begin
    CreationFlags := CreationFlags or STACK_SIZE_PARAM_IS_A_RESERVATION;
    StackSize := StackSizeOverride;
    StackSizeOverride := 0;
  end;

  Result := TrampolineBeginThread(SecurityAttributes, StackSize, ThreadFunc, 
    Parameter, CreationFlags, ThreadId);
end;

constructor TThreadHelper.Create(CreateSuspended: Boolean; StackSize: LongWord);
begin
  StackSizeOverride := StackSize;
  inherited Create(CreateSuspended);
end;

initialization

TrampolineBeginThread := InterceptCreate(@BeginThread, @InterceptBeginThread);

finalization

InterceptRemove(@TrampolineBeginThread, @InterceptBeginThread);

end.

我不知道为什么 Embt 不允许程序员指定堆栈大小，如果有人知道原因，我会很感兴趣。