source: trunk/testapp/threads/threads.c@ 21603

/*
 * Taken from here http://msdn.microsoft.com/en-us/library/ms682516%28v=VS.85%29.aspx
 * and slightly modified to compile with Odin
 */

#include <windows.h>
#include <tchar.h>

#define MAX_THREADS 10
#define BUF_SIZE 255

#ifdef _MSC_VER
#include <strsafe.h>
#else
#include <stdarg.h>
void StringCchPrintf(LPTSTR pszDest, size_t cchDest,
                     LPCTSTR pszFormat, ...);
void StringCchLength(LPCTSTR psz, size_t cchMax, size_t *pcch);
#endif

DWORD WINAPI MyThreadFunction( LPVOID lpParam );
void ErrorHandler(LPTSTR lpszFunction);

// Sample custom data structure for threads to use.
// This is passed by void pointer so it can be any data type
// that can be passed using a single void pointer (LPVOID).
typedef struct MyData {
    int val1;
    int val2;
} MYDATA, *PMYDATA;

#ifndef _MSC_VER

void StringCchPrintf(LPTSTR pszDest, size_t cchDest,
                     LPCTSTR pszFormat, ...)
{
    va_list ap;
    
    va_start(ap, pszFormat);
    vsnprintf(pszDest, cchDest, pszFormat, ap);
    va_end(ap);    
}

void StringCchLength(LPCTSTR psz, size_t cchMax, size_t *pcch)
{
    *pcch = strnlen(psz, cchMax);
}

#endif

int _tmain()
{
    PMYDATA pDataArray[MAX_THREADS];
    DWORD   dwThreadIdArray[MAX_THREADS];
    HANDLE  hThreadArray[MAX_THREADS]; 

    // Create MAX_THREADS worker threads.

    int i;
    for( i=0; i<MAX_THREADS; i++ )
    {
        // Allocate memory for thread data.

        pDataArray[i] = (PMYDATA) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
                sizeof(MYDATA));

        if( pDataArray[i] == NULL )
        {
           // If the array allocation fails, the system is out of memory
           // so there is no point in trying to print an error message.
           // Just terminate execution.
            ExitProcess(2);
        }

        // Generate unique data for each thread to work with.

        pDataArray[i]->val1 = i;
        pDataArray[i]->val2 = i+100;

        // Create the thread to begin execution on its own.

        hThreadArray[i] = CreateThread( 
            NULL,                   // default security attributes
            0,                      // use default stack size  
            MyThreadFunction,       // thread function name
            pDataArray[i],          // argument to thread function 
            0,                      // use default creation flags 
            &dwThreadIdArray[i]);   // returns the thread identifier 


        // Check the return value for success.
        // If CreateThread fails, terminate execution. 
        // This will automatically clean up threads and memory. 

        if (hThreadArray[i] == NULL) 
        {
           ErrorHandler(TEXT("CreateThread"));
           ExitProcess(3);
        }
    } // End of main thread creation loop.

    // Wait until all threads have terminated.

    WaitForMultipleObjects(MAX_THREADS, hThreadArray, TRUE, INFINITE);

    // Close all thread handles and free memory allocations.

    for(i=0; i<MAX_THREADS; i++)
    {
        CloseHandle(hThreadArray[i]);
        if(pDataArray[i] != NULL)
        {
            HeapFree(GetProcessHeap(), 0, pDataArray[i]);
            pDataArray[i] = NULL;    // Ensure address is not reused.
        }
    }

    return 0;
}


DWORD WINAPI MyThreadFunction( LPVOID lpParam ) 
{ 
    HANDLE hStdout;
    PMYDATA pDataArray;

    TCHAR msgBuf[BUF_SIZE];
    size_t cchStringSize;
    DWORD dwChars;

    // Make sure there is a console to receive output results. 

    hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    if( hStdout == INVALID_HANDLE_VALUE )
        return 1;

    // Cast the parameter to the correct data type.
    // The pointer is known to be valid because 
        // it was checked for NULL before the thread was created.
 
    pDataArray = (PMYDATA)lpParam;

    // Print the parameter values using thread-safe functions.

    StringCchPrintf(msgBuf, BUF_SIZE, TEXT("Parameters = %d, %d\n"), 
        pDataArray->val1, pDataArray->val2); 
    StringCchLength(msgBuf, BUF_SIZE, &cchStringSize);
#ifdef _MSC_VER
    WriteConsole(hStdout, msgBuf, (DWORD)cchStringSize, &dwChars, NULL);
#else
    // WriteConsole seems to be a stub in Odin yet
    printf("%s", msgBuf);
#endif    

    return 0; 
} 



void ErrorHandler(LPTSTR lpszFunction) 
{ 
    // Retrieve the system error message for the last-error code.

    LPVOID lpMsgBuf;
    LPVOID lpDisplayBuf;
    DWORD dw = GetLastError(); 

    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | 
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPTSTR) &lpMsgBuf,
        0, NULL );

    // Display the error message.

    lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT, 
        (lstrlen((LPCTSTR) lpMsgBuf) + lstrlen((LPCTSTR) lpszFunction) + 40) * sizeof(TCHAR)); 
    StringCchPrintf((LPTSTR)lpDisplayBuf, 
        LocalSize(lpDisplayBuf) / sizeof(TCHAR),
        TEXT("%s failed with error %d: %s"), 
        lpszFunction, dw, lpMsgBuf); 
    MessageBox(NULL, (LPCTSTR) lpDisplayBuf, TEXT("Error"), MB_OK); 

        // Free error-handling buffer allocations.

    LocalFree(lpMsgBuf);
    LocalFree(lpDisplayBuf);
}