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• async: asynchronously start a new task to execute a statement.
• finish: execute a statement, but wait until all (transitively) spawned asyncs in statement's scope have terminated.

#include <stdio.h>
int main (int argc, char ** argv) {
  finish {
    async {
      printf("Hello World !\n");
    }
  }
  return 0;
}

In this simple example, we create an asynchronous task using an async block, which contains the code to display "HelloWorld". A finish block wraps the async which allows to wait for its complete execution before proceeding to the return statement.