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47c740e0b2
Exercise all basic use cases on mutexes. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BUG=None TEST=make qemu-tests Change-Id: I40de3ae59862db96b40a067c9ad54a978f5646b8
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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* Copyright 2011 Google Inc.
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*
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* Tasks for mutexes basic tests.
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*/
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#include "common.h"
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#include "uart.h"
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#include "task.h"
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#include "timer.h"
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static struct mutex mtx;
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/* Linear congruential pseudo random number generator*/
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static uint32_t prng(uint32_t x)
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{
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return 22695477 * x + 1;
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}
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/* period between 50us and 12.8ms */
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#define PERIOD_US(num) (((num % 256) + 1) * 50)
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/* one of the 3 MTX3x tasks */
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#define RANDOM_TASK(num) (TASK_ID_MTX3C + (num % 3))
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int mutex_random_task(void *unused)
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{
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char letter = 'A'+(TASK_ID_MTX3A - task_get_current());
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/* wait to be activated */
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while (1) {
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task_wait_msg(0);
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uart_printf("%c+\n", letter);
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mutex_lock(&mtx);
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uart_printf("%c=\n", letter);
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task_wait_msg(0);
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uart_printf("%c-\n", letter);
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mutex_unlock(&mtx);
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}
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task_wait_msg(0);
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return EC_SUCCESS;
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}
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int mutex_second_task(void *unused)
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{
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task_id_t id = task_get_current();
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uart_printf("\n[Mutex second task %d]\n", id);
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task_wait_msg(0);
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uart_printf("MTX2: locking...");
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mutex_lock(&mtx);
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uart_printf("done\n");
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task_send_msg(TASK_ID_MTX1, 1, 0);
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uart_printf("MTX2: unlocking...\n");
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mutex_unlock(&mtx);
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task_wait_msg(0);
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return EC_SUCCESS;
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}
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int mutex_main_task(void *unused)
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{
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task_id_t id = task_get_current();
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uint32_t rdelay = (uint32_t)0x0bad1dea;
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uint32_t rtask = (uint32_t)0x1a4e1dea;
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int i;
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uart_printf("\n[Mutex main task %d]\n", id);
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/* --- Lock/Unlock without contention --- */
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uart_printf("No contention :");
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mutex_lock(&mtx);
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mutex_unlock(&mtx);
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mutex_lock(&mtx);
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mutex_unlock(&mtx);
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mutex_lock(&mtx);
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mutex_unlock(&mtx);
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uart_printf("done.\n");
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/* --- Serialization to test simple contention --- */
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uart_printf("Simple contention :\n");
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/* lock the mutex from the other task */
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task_send_msg(TASK_ID_MTX2, 1, 1);
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/* block on the mutex */
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uart_printf("MTX1: blocking...\n");
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mutex_lock(&mtx);
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uart_printf("MTX1: get lock\n");
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mutex_unlock(&mtx);
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/* --- mass lock-unlocking from several tasks --- */
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uart_printf("Massive locking/unlocking :\n");
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for (i = 0; i < 500; i++) {
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/* Wake up a random task */
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task_send_msg(RANDOM_TASK(rtask), 1, 0);
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/* next pseudo random delay */
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rtask = prng(rtask);
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/* Wait for a "random" period */
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task_wait_msg(PERIOD_US(rdelay));
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/* next pseudo random delay */
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rdelay = prng(rdelay);
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}
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uart_printf("Test done.\n");
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task_wait_msg(0);
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return EC_SUCCESS;
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}
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