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/* Copyright 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
* Copyright 2011 Google Inc.
*
* Tasks for mutexes basic tests.
*/
#include "console.h"
#include "common.h"
#include "task.h"
#include "test_util.h"
#include "timer.h"
#include "util.h"
static struct mutex mtx;
/* period between 50us and 3.2ms */
#define PERIOD_US(num) (((num % 64) + 1) * 50)
/* one of the 3 MTX3x tasks */
#define RANDOM_TASK(num) (TASK_ID_MTX3C + (num % 3))
int mutex_random_task(void *unused)
{
char letter = 'A'+(TASK_ID_MTX3A - task_get_current());
/* wait to be activated */
while (1) {
task_wait_event(0);
ccprintf("%c+\n", letter);
mutex_lock(&mtx);
ccprintf("%c=\n", letter);
task_wait_event(0);
ccprintf("%c-\n", letter);
mutex_unlock(&mtx);
}
task_wait_event(0);
return EC_SUCCESS;
}
int mutex_second_task(void *unused)
{
task_id_t id = task_get_current();
ccprintf("\n[Mutex second task %d]\n", id);
task_wait_event(0);
ccprintf("MTX2: locking...");
mutex_lock(&mtx);
ccprintf("done\n");
task_wake(TASK_ID_MTX1);
ccprintf("MTX2: unlocking...\n");
mutex_unlock(&mtx);
task_wait_event(0);
return EC_SUCCESS;
}
int mutex_main_task(void *unused)
{
task_id_t id = task_get_current();
uint32_t rdelay = (uint32_t)0x0bad1dea;
uint32_t rtask = (uint32_t)0x1a4e1dea;
int i;
ccprintf("\n[Mutex main task %d]\n", id);
task_wait_event(0);
/* --- Lock/Unlock without contention --- */
ccprintf("No contention :");
mutex_lock(&mtx);
mutex_unlock(&mtx);
mutex_lock(&mtx);
mutex_unlock(&mtx);
mutex_lock(&mtx);
mutex_unlock(&mtx);
ccprintf("done.\n");
/* --- Serialization to test simple contention --- */
ccprintf("Simple contention :\n");
/* lock the mutex from the other task */
task_set_event(TASK_ID_MTX2, TASK_EVENT_WAKE);
task_wait_event(0);
/* block on the mutex */
ccprintf("MTX1: blocking...\n");
mutex_lock(&mtx);
ccprintf("MTX1: get lock\n");
mutex_unlock(&mtx);
/* --- mass lock-unlocking from several tasks --- */
ccprintf("Massive locking/unlocking :\n");
for (i = 0; i < 500; i++) {
/* Wake up a random task */
task_wake(RANDOM_TASK(rtask));
/* next pseudo random delay */
rtask = prng(rtask);
/* Wait for a "random" period */
task_wait_event(PERIOD_US(rdelay));
/* next pseudo random delay */
rdelay = prng(rdelay);
}
test_pass();
task_wait_event(0);
return EC_SUCCESS;
}
void run_test(int argc, char **argv)
{
wait_for_task_started();
task_wake(TASK_ID_MTX1);
}
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