Method finishChild

util/parallel.cpp:181–198

* if is_timeout is true, we in signal handling context and can only * call async-safe functions */

 * call async-safe functions
 */
void parallel::finishChild(bool is_timeout) {
  ensureChild();
  /*
   * return the token before performing writes that may block. this
   * results in a short-term load violation but also it prevents a
   * deadlock
   */
  putToken();
  if (is_timeout) {
    const char *msg = "ERROR: Timeout asynchronous\n\n";
    safe_write(fd_to_parent, msg, std::strlen(msg));
  } else {
    childProcess &me = children.back();
    auto data = std::move(me.output).str();
    auto size = data.size();
    ENSURE(safe_write(me.pipe[1], data.c_str(), size) == (ssize_t)size);
  }
}

void parallel::finishParent() {
  ensureParent();