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Что такое hMutex?   Найти похожие ветки 

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Dark Elf   (2003-10-27 11:45) [0]

Уважаемые мастера!

Не подскажете ли что такое hMutex и как им пользоваться?

Заранее благодарен за ответ

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← →
N169   (2003-10-27 11:58) [1]

Это слово из латинских букв.

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← →
Dark Elf   (2003-10-27 12:00) [2]

Молодец юнга!

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← →
isko   (2003-10-27 13:06) [3]

похоже на что то знакомое)

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← →
Сатир   (2003-10-27 14:27) [4]

hMutex: THandle;
Mutex Handle ( MUTal EXclusoins)
Юзается при работе с потоками с использованием мьютексов.

The CreateMutex function creates a named or unnamed mutex object.

HANDLE CreateMutex(

LPSECURITY_ATTRIBUTES lpMutexAttributes, // pointer to security attributes
BOOL bInitialOwner, // flag for initial ownership
LPCTSTR lpName // pointer to mutex-object name
);


Parameters

lpMutexAttributes

Pointer to a SECURITY_ATTRIBUTES structure that determines whether the returned handle can be inherited by child processes. If lpMutexAttributes is NULL, the handle cannot be inherited.

Windows NT: The lpSecurityDescriptor member of the structure specifies a security descriptor for the new mutex. If lpMutexAttributes is NULL, the mutex gets a default security descriptor.
Windows 95: The lpSecurityDescriptor member of the structure is ignored.

bInitialOwner

Specifies the initial owner of the mutex object. If TRUE, the calling thread requests immediate ownership of the mutex object. Otherwise, the mutex is not owned.

lpName

Points to a null-terminated string specifying the name of the mutex object. The name is limited to MAX_PATH characters and can contain any character except the backslash path-separator character (\). Name comparison is case sensitive.

If lpName matches the name of an existing named mutex object, this function requests MUTEX_ALL_ACCESS access to the existing object. In this case, the bInitialOwner parameter is ignored because it has already been set by the creating process. If the lpMutexAttributes parameter is not NULL, it determines whether the handle can be inherited, but its security-descriptor member is ignored.
If lpName is NULL, the mutex object is created without a name.

If lpName matches the name of an existing event, semaphore, or file-mapping object, the function fails and the GetLastError function returns ERROR_INVALID_HANDLE. This occurs because event, mutex, semaphore, and file-mapping objects share the same name space.

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Сатир   (2003-10-27 14:29) [5]

А вот и лёгкий примерчик по сабжу:

unit Main;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls;

type
TMainForm = class(TForm)
Button1: TButton;
ListBox1: TListBox;
procedure Button1Click(Sender: TObject);
private
procedure ThreadsDone(Sender: TObject);
end;

TFooThread = class(TThread)
protected
procedure Execute; override;
end;

var
MainForm: TMainForm;

implementation

{$R *.DFM}

const
MaxSize = 128;

var
NextNumber: Integer = 0;
DoneFlags: Integer = 0;
GlobalArray: array[1..MaxSize] of Integer;
hMutex: THandle = 0;

function GetNextNumber: Integer;
begin
Result := NextNumber; // return global var
Inc(NextNumber); // inc global var
end;

procedure TFooThread.Execute;
var
i: Integer;
begin
FreeOnTerminate := True;
OnTerminate := MainForm.ThreadsDone;
if WaitForSingleObject(hMutex, INFINITE) = WAIT_OBJECT_0 then
begin
for i := 1 to MaxSize do
begin
GlobalArray[i] := GetNextNumber; // set array element
Sleep(5); // let thread intertwine
end;
end;
ReleaseMutex(hMutex);
end;

procedure TMainForm.ThreadsDone(Sender: TObject);
var
i: Integer;
begin
Inc(DoneFlags);
if DoneFlags = 2 then // make sure both threads finished
begin
for i := 1 to MaxSize do
{ fill listbox with array contents }
Listbox1.Items.Add(IntToStr(GlobalArray[i]));
CloseHandle(hMutex);
end;
end;

procedure TMainForm.Button1Click(Sender: TObject);
begin
hMutex := CreateMutex(nil, False, nil);
TFooThread.Create(False); // create threads
TFooThread.Create(False);
end;

end.



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← →
DVM   (2003-10-27 18:16) [6]

это название переменной

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← →
Сатир   (2003-10-27 18:29) [7]

>это название переменной
с чего ты взял?

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← →
Palladin   (2003-10-27 18:34) [8]

> Сатир © (27.10.03 18:29) [7]

ну а что это тогда?

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← →
Сатир   (2003-10-27 18:41) [9]

так, обычный оффтопик...

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