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Ahoj mam taky problemek, delam cosik do skoly a vypoustim tam vlakna. Ve windows to delam pomoci _beginthread(), ale nejak jsem tu nenasel zadnou funkci, ktera by se podobala linuxovemu pthread_join(). Nevit o necem?
DIk
Fórum › C / C++
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Super členpopiste nam co dela
pthread_join()pthread_join() je Ceckovska funkce pod linuxem z knihovny <pthread.h> zpusobuje cekani na konkretni vlakno, nez dokonci svuj kod - tedy se mapriklad neukonci main dokud se nodokonci vlakna...
A take bych potreboval vedet, jak z vlakna vymlatit jeho navratovou hodnotu.
zkuste si projit tento kod od Petzolda:
/*---------------------------------------
MULTI1.C -- Demonstrace multitaskingu
(c) Charles Petzold, 1998
---------------------------------------*/
#include <windows.h>
#include <math.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int cyChar ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Multi1") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("Program vyžaduje Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Demonstrace multitaskingu"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
int CheckBottom (HWND hwnd, int cyClient, int iLine)
{
if (iLine * cyChar + cyChar > cyClient)
{
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow (hwnd) ;
iLine = 0 ;
}
return iLine ;
}
// ---------------------------------------------
// Okno 1: Zobrazení rostoucí posloupnosti čísel
// ---------------------------------------------
LRESULT APIENTRY WndProc1 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int iNum, iLine, cyClient ;
HDC hdc ;
TCHAR szBuffer[16] ;
switch (message)
{
case WM_SIZE:
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
if (iNum < 0)
iNum = 0 ;
iLine = CheckBottom (hwnd, cyClient, iLine) ;
hdc = GetDC (hwnd) ;
TextOut (hdc, 0, iLine * cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum++)) ;
ReleaseDC (hwnd, hdc) ;
iLine++ ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// -------------------------------------------------
// Okno 2: Zobrazení rostoucí posloupnosti prvočísel
// -------------------------------------------------
LRESULT APIENTRY WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int iNum = 1, iLine, cyClient ;
HDC hdc ;
int i, iSqrt ;
TCHAR szBuffer[16] ;
switch (message)
{
case WM_SIZE:
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
do {
if (++iNum < 0)
iNum = 0 ;
iSqrt = (int) sqrt (iNum) ;
for (i = 2 ; i <= iSqrt ; i++)
if (iNum % i == 0)
break ;
}
while (i <= iSqrt) ;
iLine = CheckBottom (hwnd, cyClient, iLine) ;
hdc = GetDC (hwnd) ;
TextOut (hdc, 0, iLine * cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
ReleaseDC (hwnd, hdc) ;
iLine++ ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// ------------------------------------------
// Okno 3: Zobrazení Fibonacciho posloupnosti
// ------------------------------------------
LRESULT APIENTRY WndProc3 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int iNum = 0, iNext = 1, iLine, cyClient ;
HDC hdc ;
int iTemp ;
TCHAR szBuffer[16] ;
switch (message)
{
case WM_SIZE:
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
if (iNum < 0)
{
iNum = 0 ;
iNext = 1 ;
}
iLine = CheckBottom (hwnd, cyClient, iLine) ;
hdc = GetDC (hwnd) ;
TextOut (hdc, 0, iLine * cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
ReleaseDC (hwnd, hdc) ;
iTemp = iNum ;
iNum = iNext ;
iNext += iTemp ;
iLine++ ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// ----------------------------------------------
// Okno 4: Zobrazení kružnic s náhodným poloměrem
// ----------------------------------------------
LRESULT APIENTRY WndProc4 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClient, cyClient ;
HDC hdc ;
int iDiameter ;
switch (message)
{
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow (hwnd) ;
iDiameter = rand() % (max (1, min (cxClient, cyClient))) ;
hdc = GetDC (hwnd) ;
Ellipse (hdc, (cxClient - iDiameter) / 2,
(cyClient - iDiameter) / 2,
(cxClient + iDiameter) / 2,
(cyClient + iDiameter) / 2) ;
ReleaseDC (hwnd, hdc) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// ------------------------------------
// Hlavní okno vytvářející dceřiná okna
// ------------------------------------
LRESULT APIENTRY WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[4] ;
static TCHAR * szChildClass[] = { TEXT ("Child1"), TEXT ("Child2"),
TEXT ("Child3"), TEXT ("Child4") } ;
static WNDPROC ChildProc[] = { WndProc1, WndProc2, WndProc3, WndProc4 } ;
HINSTANCE hInstance ;
int i, cxClient, cyClient ;
WNDCLASS wndclass ;
switch (message)
{
case WM_CREATE:
hInstance = (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE) ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = NULL ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
for (i = 0 ; i < 4 ; i++)
{
wndclass.lpfnWndProc = ChildProc[i] ;
wndclass.lpszClassName = szChildClass[i] ;
RegisterClass (&wndclass) ;
hwndChild[i] = CreateWindow (szChildClass[i], NULL,
WS_CHILDWINDOW | WS_BORDER | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU) i, hInstance, NULL) ;
}
cyChar = HIWORD (GetDialogBaseUnits ()) ;
SetTimer (hwnd, 1, 10, NULL) ;
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
for (i = 0 ; i < 4 ; i++)
MoveWindow (hwndChild[i], (i % 2) * cxClient / 2,
(i > 1) * cyClient / 2,
cxClient / 2, cyClient / 2, TRUE) ;
return 0 ;
case WM_TIMER:
for (i = 0 ; i < 4 ; i++)
SendMessage (hwndChild[i], WM_TIMER, wParam, lParam) ;
return 0 ;
case WM_CHAR:
if (wParam == '\x1B')
DestroyWindow (hwnd) ;
return 0 ;
case WM_DESTROY:
KillTimer (hwnd, 1) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
nebo kod 2:
/*---------------------------------------
MULTI2.C -- Demonstrace multitaskingu
(c) Charles Petzold, 1998
---------------------------------------*/
#include <windows.h>
#include <math.h>
#include <process.h>
typedef struct
{
HWND hwnd ;
int cxClient ;
int cyClient ;
int cyChar ;
BOOL bKill ;
}
PARAMS, *PPARAMS ;
LRESULT APIENTRY WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Multi2") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("Program vyžaduje Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Demonstrace multitaskingu"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
int CheckBottom (HWND hwnd, int cyClient, int cyChar, int iLine)
{
if (iLine * cyChar + cyChar > cyClient)
{
InvalidateRect (hwnd, NULL, TRUE) ;
UpdateWindow (hwnd) ;
iLine = 0 ;
}
return iLine ;
}
// ---------------------------------------------
// Okno 1: Zobrazení rostoucí posloupnosti čísel
// ---------------------------------------------
void Thread1 (PVOID pvoid)
{
HDC hdc ;
int iNum = 0, iLine = 0 ;
PPARAMS pparams ;
TCHAR szBuffer[16] ;
pparams = (PPARAMS) pvoid ;
while (!pparams->bKill)
{
if (iNum < 0)
iNum = 0 ;
iLine = CheckBottom (pparams->hwnd, pparams->cyClient,
pparams->cyChar, iLine) ;
hdc = GetDC (pparams->hwnd) ;
TextOut (hdc, 0, iLine * pparams->cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum++)) ;
ReleaseDC (pparams->hwnd, hdc) ;
iLine++ ;
}
_endthread () ;
}
LRESULT APIENTRY WndProc1 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static PARAMS params ;
switch (message)
{
case WM_CREATE:
params.hwnd = hwnd ;
params.cyChar = HIWORD (GetDialogBaseUnits ()) ;
_beginthread (Thread1, 0, ¶ms) ;
return 0 ;
case WM_SIZE:
params.cyClient = HIWORD (lParam) ;
return 0 ;
case WM_DESTROY:
params.bKill = TRUE ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// -------------------------------------------------
// Okno 2: Zobrazení rostoucí posloupnosti prvočísel
// -------------------------------------------------
void Thread2 (PVOID pvoid)
{
HDC hdc ;
int iNum = 1, iLine = 0, i, iSqrt ;
PPARAMS pparams ;
TCHAR szBuffer[16] ;
pparams = (PPARAMS) pvoid ;
while (!pparams->bKill)
{
do
{
if (++iNum < 0)
iNum = 0 ;
iSqrt = (int) sqrt (iNum) ;
for (i = 2 ; i <= iSqrt ; i++)
if (iNum % i == 0)
break ;
}
while (i <= iSqrt) ;
iLine = CheckBottom (pparams->hwnd, pparams->cyClient,
pparams->cyChar, iLine) ;
hdc = GetDC (pparams->hwnd) ;
TextOut (hdc, 0, iLine * pparams->cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
ReleaseDC (pparams->hwnd, hdc) ;
iLine++ ;
}
_endthread () ;
}
LRESULT APIENTRY WndProc2 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static PARAMS params ;
switch (message)
{
case WM_CREATE:
params.hwnd = hwnd ;
params.cyChar = HIWORD (GetDialogBaseUnits ()) ;
_beginthread (Thread2, 0, ¶ms) ;
return 0 ;
case WM_SIZE:
params.cyClient = HIWORD (lParam) ;
return 0 ;
case WM_DESTROY:
params.bKill = TRUE ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// ------------------------------------------
// Okno 3: Zobrazení Fibonacciho posloupnosti
// ------------------------------------------
void Thread3 (PVOID pvoid)
{
HDC hdc ;
int iNum = 0, iNext = 1, iLine = 0, iTemp ;
PPARAMS pparams ;
TCHAR szBuffer[16] ;
pparams = (PPARAMS) pvoid ;
while (!pparams->bKill)
{
if (iNum < 0)
{
iNum = 0 ;
iNext = 1 ;
}
iLine = CheckBottom (pparams->hwnd, pparams->cyClient,
pparams->cyChar, iLine) ;
hdc = GetDC (pparams->hwnd) ;
TextOut (hdc, 0, iLine * pparams->cyChar, szBuffer,
wsprintf (szBuffer, TEXT ("%d"), iNum)) ;
ReleaseDC (pparams->hwnd, hdc) ;
iTemp = iNum ;
iNum = iNext ;
iNext += iTemp ;
iLine++ ;
}
_endthread () ;
}
LRESULT APIENTRY WndProc3 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static PARAMS params ;
switch (message)
{
case WM_CREATE:
params.hwnd = hwnd ;
params.cyChar = HIWORD (GetDialogBaseUnits ()) ;
_beginthread (Thread3, 0, ¶ms) ;
return 0 ;
case WM_SIZE:
params.cyClient = HIWORD (lParam) ;
return 0 ;
case WM_DESTROY:
params.bKill = TRUE ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// ----------------------------------------------
// Okno 4: Zobrazení kružnic s náhodným poloměrem
// ----------------------------------------------
void Thread4 (PVOID pvoid)
{
HDC hdc ;
int iDiameter ;
PPARAMS pparams ;
pparams = (PPARAMS) pvoid ;
while (!pparams->bKill)
{
InvalidateRect (pparams->hwnd, NULL, TRUE) ;
UpdateWindow (pparams->hwnd) ;
iDiameter = rand() % (max (1,
min (pparams->cxClient, pparams->cyClient))) ;
hdc = GetDC (pparams->hwnd) ;
Ellipse (hdc, (pparams->cxClient - iDiameter) / 2,
(pparams->cyClient - iDiameter) / 2,
(pparams->cxClient + iDiameter) / 2,
(pparams->cyClient + iDiameter) / 2) ;
ReleaseDC (pparams->hwnd, hdc) ;
}
_endthread () ;
}
LRESULT APIENTRY WndProc4 (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static PARAMS params ;
switch (message)
{
case WM_CREATE:
params.hwnd = hwnd ;
params.cyChar = HIWORD (GetDialogBaseUnits ()) ;
_beginthread (Thread4, 0, ¶ms) ;
return 0 ;
case WM_SIZE:
params.cxClient = LOWORD (lParam) ;
params.cyClient = HIWORD (lParam) ;
return 0 ;
case WM_DESTROY:
params.bKill = TRUE ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
// ------------------------------------
// Hlavní okno vytvářející dceřiná okna
// ------------------------------------
LRESULT APIENTRY WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[4] ;
static TCHAR * szChildClass[] = { TEXT ("Child1"), TEXT ("Child2"),
TEXT ("Child3"), TEXT ("Child4") } ;
static WNDPROC ChildProc[] = { WndProc1, WndProc2, WndProc3, WndProc4 } ;
HINSTANCE hInstance ;
int i, cxClient, cyClient ;
WNDCLASS wndclass ;
switch (message)
{
case WM_CREATE:
hInstance = (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE) ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = NULL ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
for (i = 0 ; i < 4 ; i++)
{
wndclass.lpfnWndProc = ChildProc[i] ;
wndclass.lpszClassName = szChildClass[i] ;
RegisterClass (&wndclass) ;
hwndChild[i] = CreateWindow (szChildClass[i], NULL,
WS_CHILDWINDOW | WS_BORDER | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU) i, hInstance, NULL) ;
}
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
for (i = 0 ; i < 4 ; i++)
MoveWindow (hwndChild[i], (i % 2) * cxClient / 2,
(i > 1) * cyClient / 2,
cxClient / 2, cyClient / 2, TRUE) ;
return 0 ;
case WM_CHAR:
if (wParam == '\x1B')
DestroyWindow (hwnd) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
Věrný členVlakna vo Win su pomerne dost odlisne od POSIX vlakien pthread. Inac tento problem sa da vyriesit trosku inac. Funkciou CreateThread si vytvoris vlakno, dostanes handle vlakna. Existuje funkcia GetExitCodeThread() ktora vracia navratovu hodnotu vlakna. Ak vlakno nebolo ukoncene , tak vrati STILL_ACTIVE. Ak budes tuto funkciu volat v nejakom loope, tak dostanes vlastne funkcionalitu pthread_join().
Pre _beginthread som zazrel riesenie:
#include <windows.h>
#include <stdio.h>
#include <process.h>
unsigned Counter;
unsigned __stdcall SecondThreadFunc( void* pArguments )
{
printf( "In second thread...\n" );
while ( Counter < 1000000 )
Counter++;
_endthreadex( 0 );
return 0;
}
int main()
{
HANDLE hThread;
unsigned threadID;
printf( "Creating second thread...\n" );
// Create the second thread.
hThread = (HANDLE)_beginthreadex( NULL, 0, &SecondThreadFunc, NULL, 0, &threadID );
// Wait until second thread terminates.
WaitForSingleObject( hThread, INFINITE );
printf( "Counter should be 1000000; it is-> %d\n", Counter );
// Destroy the thread object.
CloseHandle( hThread );
}
prosim Vas sn3d nevzpomiante si kde jste tento priklad nasel? Rad bych se tam podival jestli tam nepisou nejake dodatecne inforamce, protoze kod tak jak je uvedeny mi nefunguje, hlasi to:
error C2065: '_endthreadex' : undeclared identifier
error C2065: '_beginthreadex' : undeclared identifier
warning C4508: 'main' : function should return a value; 'void' return type assumedreturn 0; jsem doplnil ale co s ostatnim netusim protoze nevim proc to neche brat kdyz _beginthreadex je v process.h, nevite?
edit: omlouvam se za takovou zacatecnickou chybu:
#if !defined(_MT)
#error _beginthreadex requires a multithreaded C run-time library.
#endifje jasne ze jsem nemel zapnuty multi thread v nastaveni
nashle
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