diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/protothreads/pt-1.4/example-buffer.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/protothreads/pt-1.4/example-buffer.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/protothreads/pt-1.4/example-buffer.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/protothreads/pt-1.4/example-buffer.c new file mode 100644 index 0000000..44fa4a7 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/protothreads/pt-1.4/example-buffer.c @@ -0,0 +1,165 @@ +/* + * Copyright (c) 2004-2005, Swedish Institute of Computer Science. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * This file is part of the protothreads library. + * + * Author: Adam Dunkels <adam@sics.se> + * + * $Id: example-buffer.c,v 1.5 2005/10/07 05:21:33 adam Exp $ + */ + +#ifdef _WIN32 +#include <windows.h> +#else +#include <unistd.h> +#endif +#include <stdio.h> + +#include "pt-sem.h" + +#define NUM_ITEMS 32 +#define BUFSIZE 8 + +static int buffer[BUFSIZE]; +static int bufptr; + +static void +add_to_buffer(int item) +{ + printf("Item %d added to buffer at place %d\n", item, bufptr); + buffer[bufptr] = item; + bufptr = (bufptr + 1) % BUFSIZE; +} +static int +get_from_buffer(void) +{ + int item; + item = buffer[bufptr]; + printf("Item %d retrieved from buffer at place %d\n", + item, bufptr); + bufptr = (bufptr + 1) % BUFSIZE; + return item; +} + +static int +produce_item(void) +{ + static int item = 0; + printf("Item %d produced\n", item); + return item++; +} + +static void +consume_item(int item) +{ + printf("Item %d consumed\n", item); +} + +static struct pt_sem full, empty; + +static +PT_THREAD(producer(struct pt *pt)) +{ + static int produced; + + PT_BEGIN(pt); + + for(produced = 0; produced < NUM_ITEMS; ++produced) { + + PT_SEM_WAIT(pt, &full); + + add_to_buffer(produce_item()); + + PT_SEM_SIGNAL(pt, &empty); + } + + PT_END(pt); +} + +static +PT_THREAD(consumer(struct pt *pt)) +{ + static int consumed; + + PT_BEGIN(pt); + + for(consumed = 0; consumed < NUM_ITEMS; ++consumed) { + + PT_SEM_WAIT(pt, &empty); + + consume_item(get_from_buffer()); + + PT_SEM_SIGNAL(pt, &full); + } + + PT_END(pt); +} + +static +PT_THREAD(driver_thread(struct pt *pt)) +{ + static struct pt pt_producer, pt_consumer; + + PT_BEGIN(pt); + + PT_SEM_INIT(&empty, 0); + PT_SEM_INIT(&full, BUFSIZE); + + PT_INIT(&pt_producer); + PT_INIT(&pt_consumer); + + PT_WAIT_THREAD(pt, producer(&pt_producer) & + consumer(&pt_consumer)); + + PT_END(pt); +} + + +int +main(void) +{ + struct pt driver_pt; + + PT_INIT(&driver_pt); + + while(PT_SCHEDULE(driver_thread(&driver_pt))) { + + /* + * When running this example on a multitasking system, we must + * give other processes a chance to run too and therefore we call + * usleep() resp. Sleep() here. On a dedicated embedded system, + * we usually do not need to do this. + */ +#ifdef _WIN32 + Sleep(0); +#else + usleep(10); +#endif + } + return 0; +} |