hello.c

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/* -*- C -*-
 * Serene programming language
 * Copyright (C) 2019-2026 Sameer Rahmani <[email protected]>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
// Hello world for an external program that links libserene.runtime built with
// -Dwith-serene=disabled. It uses only the substrate: the memory manager, the
// engine/context, and the fiber subsystem. No value model, no LLVM.
 
#include <stdio.h>
 
#include "serene/runtime.h"
 
// A shared sentinel result. Returning null would be legal too.
static int ok;
 
static srn_fiber_result_t say_hello(srn_context_t *ctx, void *arg) {
  (void)ctx;
  (void)arg;
  printf("hello from a Serene fiber (substrate runtime)\n");
  return &ok;
}
 
int main(void) {
  SERENE_RUNTIME_INIT_WITH_SCHED(engine, sched, nullptr);
  srn_context_t *ctx = srn_context_make(engine);
 
  (void)srn_fiber_make(ctx, sched, say_hello, NULL, 0);
  srn_sched_run(sched, 1);
 
  // The manager reclaims every context chain at shutdown, so the context
  // needs no separate release here.
  SERENE_RUNTIME_SHUTDOWN(engine);
  return 0;
}