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base: extend thread test to test locks

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Showcase issue #2300
This commit is contained in:
Alexander Boettcher 2017-03-01 14:00:52 +01:00 committed by Christian Helmuth
parent ca2871e2e4
commit 8102b78d22
1 changed files with 92 additions and 0 deletions
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92
repos/base/src/test/thread/main.cc
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@ -333,6 +333,97 @@ static void test_create_as_many_threads(Env &env)
}
/*********************************
** Using Locks in creative ways *
*********************************/
struct Lock_helper : Thread
{
enum { STACK_SIZE = 0x1000 };
Lock &lock;
bool &lock_is_free;
bool unlock;
Lock_helper(Env &env, const char * name, Cpu_session &cpu, Lock &lock,
bool &lock_is_free, bool unlock = false)
:
Thread(env, name, STACK_SIZE, Thread::Location(), Thread::Weight(),
cpu),
lock(lock), lock_is_free(lock_is_free), unlock(unlock)
{ }
void entry()
{
log(" thread '", name(), "' started");
if (unlock)
lock.unlock();
lock.lock();
if (!lock_is_free) {
log(" thread '", name(), "' got lock but somebody else is within"
" critical section !?");
throw -22;
}
log(" thread '", name(), "' done");
lock.unlock();
}
};
static void test_locks(Genode::Env &env)
{
Lock lock (Lock::LOCKED);
bool lock_is_free = true;
Cpu_connection cpu_m(env, "prio middle", Cpu_session::PRIORITY_LIMIT / 4);
Cpu_connection cpu_l(env, "prio low", Cpu_session::PRIORITY_LIMIT / 2);
enum { SYNC_STARTUP = true };
Lock_helper l1(env, "lock_low1", cpu_l, lock, lock_is_free);
Lock_helper l2(env, "lock_low2", cpu_l, lock, lock_is_free);
Lock_helper l3(env, "lock_low3", cpu_l, lock, lock_is_free);
Lock_helper l4(env, "lock_low4", cpu_l, lock, lock_is_free, SYNC_STARTUP);
l1.start();
l2.start();
l3.start();
l4.start();
lock.lock();
log(" thread '", Thread::myself()->name(), "' - I'm the lock holder - "
"take lock again");
/* we are within the critical section - lock is not free */
lock_is_free = false;
/* start another low prio thread to wake current thread when it blocks */
Lock_helper l5(env, "lock_low5", cpu_l, lock, lock_is_free, SYNC_STARTUP);
l5.start();
lock.lock();
log(" I'm the lock holder - still alive");
lock_is_free = true;
lock.unlock();
/* check that really all threads come back ! */
l1.join();
l2.join();
l3.join();
l4.join();
l5.join();
log("running '", __func__, "' done");
}
void Component::construct(Env &env)
{
log("--- thread test started ---");
@ -344,6 +435,7 @@ void Component::construct(Env &env)
test_stack_alignment(env);
test_main_thread();
test_cpu_session(env);
test_locks(env);
if (config.xml().has_sub_node("pause_resume"))
test_pause_resume(env);