Go's concurrency is a major attraction, yet C lacks goroutines. By using POSIX primitives—mutexes, condition variables, atomics, and a thread pool—the Solod compiler translates Go‑like code into plain C. The Mutex and Cond structs wrap pthread_mutex_t and pthread_cond_t, while atomic operations map to compiler built‑ins, matching Go's performance.

Once is implemented with a single atomic flag, demonstrating lock‑free fast paths. Threads are created with pthread_create; the conc. Go function returns a handle that must be joined or detached.

Because OS threads are costly, a worker pool is preferred for many short tasks. The pool coordinator launches a few long‑lived threads, and tasks are dispatched via conc. Pool.

Go, with a final conc. Pool. Wait to synchronize.

Although the runtime overhead exceeds Go's lightweight goroutines, this model offers a pragmatic way to add concurrency to C‑based Go subsets while keeping the trade‑offs explicit.