cr_task.h

FWIW, I opened a PR that adds Windows support: https://github.com/rkaehn/cr_task.h/pull/2 I may play with the C11-standard `threads.h`, but note that it was not implemented by MSVC at all until quite recently: https://devblogs.microsoft.com/cppblog/c11-threads-in-visual... Edit: Made a C11 threads.h implementation as well. https://github.com/rkaehn/cr_task.h/pull/3

Tasks are a primitive for asynchronous programming and an alternative to working with threads directly. Instead of creating a thread, performing work, then waiting on it using synchronization primitives, you only define a unit of work and let a scheduler decide when and where to execute it. The threads that the scheduler uses are created once and reused for many tasks throughout the program's lifetime. In most cases, creating and executing a task requires not even a single syscall and is a significantly faster operation than creating a thread, resulting in lower latency. Furthermore, tasks from different subsystems can be automatically interleaved by the scheduler, which is difficult to achieve manually with threads without communication between the subsystems. The library is written in standard C11 and only depends on the C POSIX library