libdill async_await

async_await.c

#include <libdill.h>
#include <stdio.h>
#include <stdlib.h>

#define lambda(lambda$_ret, lambda$_args, lambda$_body)\
  ({\
    lambda$_ret lambda$__anon$ lambda$_args\
      lambda$_body\
    &lambda$__anon$;\
  })


#define async_await(ret_type,expr) \
        ({ \
                int __async_await_ch[2];\
                chmake(__async_await_ch);\
                int __async_await_rc = go(lambda(void,(int ch),{\
                                                                ret_type retval = expr;\
                                                                chsend(ch, &retval, sizeof(ret_type),-1);\
                                                               })(__async_await_ch[1]));\
                ret_type __async_await_retval;\
                chrecv(__async_await_ch[0],&__async_await_retval,sizeof(ret_type),-1);\
                __async_await_retval;\
         })

int test() {
    msleep(now()+1000);
    return 1337;
}

int main() {
    int retval = async_await(int,test());
    printf("Return value: %d\n");
}