#include <windows.h>
#include <stdio.h>#define THREADCOUNT 2HANDLE ghMutex; DWORD WINAPI WriteToDatabase( LPVOID );int main( void )
{HANDLE aThread[THREADCOUNT];DWORD ThreadID;int i;// Create a mutex with no initial owner
ghMutex = CreateMutex( NULL,              // default security attributesFALSE,             // initially not ownedNULL);             // unnamed mutexif (ghMutex == NULL) {printf("CreateMutex error: %d\n", GetLastError());return 1;}// Create worker threadsfor( i=0; i < THREADCOUNT; i++ ){aThread[i] = CreateThread( NULL,       // default security attributes0,          // default stack size
                     (LPTHREAD_START_ROUTINE) WriteToDatabase, NULL,       // no thread function arguments0,          // default creation flags&ThreadID); // receive thread identifierif( aThread[i] == NULL ){printf("CreateThread error: %d\n", GetLastError());return 1;}}// Wait for all threads to terminate
WaitForMultipleObjects(THREADCOUNT, aThread, TRUE, INFINITE);// Close thread and mutex handlesfor( i=0; i < THREADCOUNT; i++ )CloseHandle(aThread[i]);CloseHandle(ghMutex);return 0;
}DWORD WINAPI WriteToDatabase( LPVOID lpParam )
{ // lpParam not used in this example
    UNREFERENCED_PARAMETER(lpParam);DWORD dwCount=0, dwWaitResult; // Request ownership of mutex.while( dwCount < 20 ){ dwWaitResult = WaitForSingleObject( ghMutex,    // handle to mutexINFINITE);  // no time-out intervalswitch (dwWaitResult) {// The thread got ownership of the mutexcase WAIT_OBJECT_0: __try { // TODO: Write to the databaseprintf("Thread %d writing to database...\n", GetCurrentThreadId());dwCount++;} __finally { // Release ownership of the mutex objectif (! ReleaseMutex(ghMutex)) { // Handle error.
                    } } break; // The thread got ownership of an abandoned mutex// The database is in an indeterminate statecase WAIT_ABANDONED: return FALSE; }}return TRUE;
}