test/test_emscripten_clear_timeout.c

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <emscripten/eventloop.h>

int fired_id;

void never(void *arg) {
  printf("cleared callback ran\n");
  abort();
}

void fired(void *arg) {
  printf("fired\n");
  // Clearing an id that already fired must be a no-op.
  emscripten_clear_timeout(fired_id);
  emscripten_clear_timeout(fired_id);
}

void immediate_fired(void *arg) {
  emscripten_clear_immediate(fired_id);
  emscripten_clear_immediate(fired_id);
}

// Only runs if the runtime actually exits.
void at_exit() {
  printf("done\n");
}

int main() {
  atexit(at_exit);
#if MODE_CLEARED
  // Clearing a pending timeout releases its keepalive so the runtime exits
  // from main without waiting for it (a leak fails the check below; a timer
  // that was not actually cleared aborts when it fires).
  int id = emscripten_set_timeout(never, 1000, NULL);
  assert(emscripten_runtime_keepalive_check());
  emscripten_clear_timeout(id);
  assert(!emscripten_runtime_keepalive_check());
  return 42;
#elif MODE_IDEMPOTENT
  int id = emscripten_set_timeout(never, 1000, NULL);
  emscripten_clear_timeout(id);
  emscripten_clear_timeout(id);
  fired_id = emscripten_set_timeout(fired, 0, NULL);
  // Still-pending timer must keep the runtime alive until it fires.
  emscripten_set_timeout(fired, 50, NULL);
  return 0;
#elif MODE_IMMEDIATE
  int id = emscripten_set_immediate(never, NULL);
  emscripten_clear_immediate(id);
  emscripten_clear_immediate(id);
  fired_id = emscripten_set_immediate(immediate_fired, NULL);
  emscripten_set_timeout(fired, 50, NULL);
  return 0;
#else
  emscripten_set_timeout(fired, 50, NULL);
  return 0;
#endif
}