ResThe _beginthread function creates a thread that begins execution of a routine at start_address. The routine at start_address must use the __cdecl calling convention and should have no return value. When the thread returns from that routine, it is terminated automatically. Return ValueIf successful, each of these functions returns a handle to the newly created thread. _beginthread returns –1 on an error, in which case errno is set to EAGAIN if there are too many threads, or to EINVAL if the argument is invalid or the stack size is incorrect. _beginthreadex returns 0 on an error, in which case errno and doserrno are set.Res The number of threads a process can create is limited by the available virtual memory. The number of threads that can be created depends on the default stack size. If every thread has one megabyte of stack space., you can create at most 32 threads. If you reduce the default stack size, you can create more threads. However, your application will have better performance if you create one thread per processor and build queues of requests for which the application maintains the context information. A thread would process all requests in a queue before processing requests in the next queue. The new thread handle is created with THREAD_ALL_ACCESS to the new thread. The handle can be used in any function that requires a thread object handle. Return Values A handle to the new thread indicates success. NULL indicates failure. To get extended error information, call GetLastError.
Return ValueIf successful, each of these functions returns a handle to the newly created thread. _beginthread returns –1 on an error, in which case errno is set to EAGAIN if there are too many threads, or to EINVAL if the argument is invalid or the stack size is incorrect. _beginthreadex returns 0 on an error, in which case errno and doserrno are set.Res
The number of threads a process can create is limited by the available virtual memory. The number of threads that can be created depends on the default stack size. If every thread has one megabyte of stack space., you can create at most 32 threads. If you reduce the default stack size, you can create more threads. However, your application will have better performance if you create one thread per processor and build queues of requests for which the application maintains the context information. A thread would process all requests in a queue before processing requests in the next queue. The new thread handle is created with THREAD_ALL_ACCESS to the new thread. The handle can be used in any function that requires a thread object handle. Return Values
A handle to the new thread indicates success. NULL indicates failure. To get extended error information, call GetLastError.