I'm working on a concurrency library inspired by Tame. I'm kinda loving it. Main difference: no code transformation.

async_test.cpp

#include <async.h>

void printLater(unsigned int seconds, const char message[]) {
    asleep(seconds);
    printf("%s\n", message);
}

void amain() {

    printf("Before\n");
    { await
        A(printLater(1, "First thing done"));
        printf("Kicked off one thing\n");
        A(printLater(2, "Second thing done"));
        printf("Kicked off another thing\n");
    }
    printf("After\n");

}

output.txt

Before
Kicked off one thing
Kicked off another thing
First thing done
Second thing done
After