wasm-micro-runtime/samples/simple/wasm-apps/timer.c

/*
 * Copyright (C) 2019 Intel Corporation.  All rights reserved.
 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 */

#include "wasm_app.h"

/* User global variable */
static int num = 0;

/* Timer callback */
void timer1_update(user_timer_t timer)
{
    printf("Timer update %d\n", num++);
}

void on_init()
{
    user_timer_t timer;

    /* set up a timer */
    timer = api_timer_create(1000, true, false, timer1_update);
    api_timer_restart(timer, 1000);
}

void on_destroy()
{
    /* real destroy work including killing timer and closing sensor is
       accomplished in wasm app library version of on_destroy() */
}