Re: Futexes ain't fast

On 8/29/2024 7:30 AM, Bonita Montero wrote:

This is by far the fastest code:
 #if defined(_WIN32)
     HANDLE hSem = CreateSemaphoreA( nullptr, 0, 0x7FFFFFFF, nullptr );
     auto acquire = [&] { WaitForSingleObject( hSem, INFINITE ); };
     auto release = [&] { ReleaseSemaphore( hSem, 1, nullptr ); };
#elif defined(__unix__)
     sem_t sem;
     sem_init( &sem, 0, 0 );
     auto acquire = [&] { while( sem_wait( &sem ) == EINTR ); };

[...]
Nice touch with the EINTR. I have seen a lot of code that misses this aspect... Yikes!