/* * tryentercs.c * * See if we have the TryEnterCriticalSection function. * Does not use any part of pthreads. */ #include <windows.h> #include <process.h> #include <stdio.h> /* * Function pointer to TryEnterCriticalSection if it exists * - otherwise NULL */ BOOL (WINAPI *_try_enter_critical_section)(LPCRITICAL_SECTION) = NULL; /* * Handle to kernel32.dll */ static HINSTANCE _h_kernel32; int main() { CRITICAL_SECTION cs; SetLastError(0); printf("Last Error [main enter] %ld\n", (long) GetLastError()); /* * Load KERNEL32 and try to get address of TryEnterCriticalSection */ _h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL")); _try_enter_critical_section = (BOOL (PT_STDCALL *)(LPCRITICAL_SECTION)) GetProcAddress(_h_kernel32, (LPCSTR) "TryEnterCriticalSection"); if (_try_enter_critical_section != NULL) { InitializeCriticalSection(&cs); SetLastError(0); if ((*_try_enter_critical_section)(&cs) != 0) { LeaveCriticalSection(&cs); } else { printf("Last Error [try enter] %ld\n", (long) GetLastError()); _try_enter_critical_section = NULL; } DeleteCriticalSection(&cs); } (void) FreeLibrary(_h_kernel32); printf("This system %s TryEnterCriticalSection.\n", (_try_enter_critical_section == NULL) ? "DOES NOT SUPPORT" : "SUPPORTS"); printf("POSIX Mutexes will be based on Win32 %s.\n", (_try_enter_critical_section == NULL) ? "Mutexes" : "Critical Sections"); return(0); }