/*
* Copyright (c) 2018 Agustina Arzille.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*
*
* This test checks that thread state transitions are correctly performed
* when a thread is suspended and resumed. It does so by creating three
* threads :
*
* - The first thread spins on an atomic integer used as a lock, which
* puts it in the running state. The lock is released while the thread
* is suspended, and the thread is then resumed.
*
* - The second thread waits on a zero-valued semaphore, which puts it
* in the sleeping state. The semaphore is signalled while the thread
* is suspended, and the thread is then resumed.
*
* - The third suspends itself and is then resumed.
*
* As a result, the following transitions are tested :
* o CREATED -> RUNNING (*) -> SUSPENDED -> RUNNING
* o CREATED -> RUNNING -> SLEEPING (*) -> SUSPENDED -> RUNNING.
*
* (*) Step where a suspend request is made
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
static void
test_wait_for_state(const struct thread *thread, unsigned int state)
{
while (thread_state(thread) != state) {
cpu_pause();
}
}
static void
test_spin(void *arg)
{
unsigned long *lock;
lock = arg;
while (atomic_cas(lock, 0UL, 1UL, ATOMIC_ACQ_REL) != 0) {
cpu_pause();
}
}
static void
test_sleep(void *arg)
{
struct semaphore *sem;
sem = arg;
semaphore_wait(sem);
}
static void
test_suspend_self(void *arg)
{
(void)arg;
thread_suspend(thread_self());
}
static void
test_run(void *arg)
{
struct thread *thread;
struct thread_attr attr;
unsigned long lock;
struct semaphore sem;
int error;
(void)arg;
lock = 1;
thread_attr_init(&attr, "test_spin");
error = thread_create(&thread, &attr, test_spin, &lock);
error_check(error, "thread_create");
test_wait_for_state(thread, THREAD_RUNNING);
thread_suspend(thread);
test_wait_for_state(thread, THREAD_SUSPENDED);
atomic_store(&lock, 0, ATOMIC_RELEASE);
thread_resume(thread);
thread_join(thread);
semaphore_init(&sem, 0);
thread_attr_init(&attr, "test_sleep");
error = thread_create(&thread, &attr, test_sleep, &sem);
error_check(error, "thread_create");
test_wait_for_state(thread, THREAD_SLEEPING);
thread_suspend(thread);
test_wait_for_state(thread, THREAD_SUSPENDED);
thread_wakeup(thread);
if (thread_state(thread) != THREAD_SUSPENDED) {
panic("test: unexpected thread state");
}
semaphore_post(&sem);
thread_resume(thread);
thread_join(thread);
thread_attr_init(&attr, "test_suspend_self");
error = thread_create(&thread, &attr, test_suspend_self, NULL);
test_wait_for_state(thread, THREAD_SUSPENDED);
thread_resume(thread);
thread_join(thread);
log_info("done");
}
void __init
test_setup(void)
{
struct thread_attr attr;
int error;
thread_attr_init(&attr, THREAD_KERNEL_PREFIX "test_run");
thread_attr_set_detached(&attr);
error = thread_create(NULL, &attr, test_run, NULL);
error_check(error, "thread_create");
}