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// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Thread_Manager_Test.cpp
//
// = DESCRIPTION
// This program tests the group management mechanisms provided by
// the <ACE_Thread_Manager>, including the group signal handling,
// group suspension and resumption, and cooperative thread
// cancellation mechanisms.
//
// = AUTHOR
// Prashant Jain and Douglas C. Schmidt
//
// ============================================================================
#include "ace/Thread_Manager.h"
#include "ace/Signal.h"
#include "test_config.h"
#if defined (ACE_HAS_THREADS)
#include "Thread_Manager_Test.h"
// Each thread keeps track of whether it has been signaled within a
// separate TSS entry. See comment below about why it's allocated
// dynamically.
static ACE_TSS<Signal_Catcher> *signal_catcher = 0;
// Synchronize starts of threads, so that they all start before the
// main thread cancels them. To avoid creating a static object, it
// is dynamically allocated, before spawning any threads.
static ACE_Barrier *thread_start;
extern "C" void
handler (int signum)
{
if (signal_catcher)
{
ACE_DEBUG ((LM_DEBUG,
ASYS_TEXT ("(%t) received signal %d, signaled = %d\n"),
signum,
(*signal_catcher)->signaled ()));
(*signal_catcher)->signaled (1);
}
}
static void *
worker (int iterations)
{
#if !defined (ACE_LACKS_UNIX_SIGNALS)
// Cache a pointer to this thread's Signal_Catcher. That way, we
// try to avoid dereferencing signal_catcher below in a thread that
// hasn't terminated when main exits. That shouldn't happen, but it
// seems to on Linux and LynxOS.
if (!signal_catcher)
{
ACE_DEBUG ((LM_DEBUG,
ASYS_TEXT ("(%t) (worker): signal catcher is 0!!!!\n")));
return (void *) -1;
}
Signal_Catcher *my_signal_catcher = *signal_catcher;
if (my_signal_catcher == 0)
{
ACE_DEBUG ((LM_DEBUG,
ASYS_TEXT ("(%t) (worker): *signal catcher is 0!!!!\n")));
return (void *) -1;
}
ACE_Thread_Manager *thr_mgr = ACE_Thread_Manager::instance ();
#endif /* ! ACE_LACKS_UNIX_SIGNAL */
// After setting up the signal catcher, block on the start barrier.
thread_start->wait ();
ACE_DEBUG ((LM_DEBUG,
ASYS_TEXT ("(%t) worker starting loop\n")));
for (int i = 0; i < iterations; i++)
{
if ((i % 1000) == 0)
{
#if !defined (ACE_LACKS_UNIX_SIGNALS)
if (my_signal_catcher->signaled () > 0 &&
// Only test for cancellation after we've been signaled,
// to avoid race conditions for suspend() and resume().
thr_mgr->testcancel (ACE_Thread::self ()) != 0)
{
ACE_DEBUG ((LM_DEBUG,
ASYS_TEXT ("(%t) has been cancelled before iteration %d!\n"),
i));
break;
}
#endif /* ! ACE_LACKS_UNIX_SIGNAL */
ACE_OS::sleep (1);
}
}
// Destructor removes thread from Thread_Manager.
return 0;
}
static const int DEFAULT_THREADS = ACE_MAX_THREADS;
static const int DEFAULT_ITERATIONS = 10000;
#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_TSS<Signal_Catcher>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_TSS<Signal_Catcher>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */
#endif /* ACE_HAS_THREADS */
int
main (int, ASYS_TCHAR *[])
{
ACE_START_TEST (ASYS_TEXT ("Thread_Manager_Test"));
#if defined (ACE_HAS_THREADS)
int n_threads = DEFAULT_THREADS;
int n_iterations = DEFAULT_ITERATIONS;
// Dynamically allocate signal_catcher so that we can control when
// it gets deleted. Specifically, we need to delete it before the
// main thread's TSS is cleaned up.
ACE_NEW_RETURN (signal_catcher, ACE_TSS<Signal_Catcher>, 1);
// And similarly, dynamically allocate the thread_start barrier.
ACE_NEW_RETURN (thread_start, ACE_Barrier (n_threads + 1), -1);
// Register a signal handler.
ACE_Sig_Action sa ((ACE_SignalHandler) handler, SIGINT);
ACE_UNUSED_ARG (sa);
ACE_Thread_Manager *thr_mgr = ACE_Thread_Manager::instance ();
int grp_id = thr_mgr->spawn_n (n_threads,
ACE_THR_FUNC (worker),
(void *) n_iterations,
THR_BOUND | THR_DETACHED);
ACE_ASSERT (grp_id != -1);
thread_start->wait ();
// Pthreads doesn't do suspend/resume. Neither do DCEThreads.
#if !defined (ACE_HAS_PTHREADS) && !defined (ACE_HAS_DCETHREADS)
// Wait for 1 second and then suspend every thread in the group.
ACE_OS::sleep (1);
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%t) suspending group\n")));
ACE_ASSERT (thr_mgr->suspend_grp (grp_id) != -1);
// Wait for 1 more second and then resume every thread in the
// group.
ACE_OS::sleep (ACE_Time_Value (1));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%t) resuming group\n")));
ACE_ASSERT (thr_mgr->resume_grp (grp_id) != -1);
#endif /* ! ACE_HAS_PTHREADS && ! ACE_HAS_DCETHREADS */
// Wait for 1 more second and then send a SIGINT to every thread in
// the group.
ACE_OS::sleep (ACE_Time_Value (1));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%t) signaling group\n")));
#if defined (ACE_HAS_WTHREADS)
thr_mgr->kill_grp (grp_id, SIGINT);
#else
ACE_ASSERT (thr_mgr->kill_grp (grp_id, SIGINT) != -1);
#endif /* ACE_HAS_WTHREADS */
// Wait for 1 more second and then cancel all the threads.
ACE_OS::sleep (ACE_Time_Value (1));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%t) cancelling group\n")));
ACE_ASSERT (thr_mgr->cancel_grp (grp_id) != -1);
// Perform a barrier wait until all the threads have shut down.
ACE_ASSERT (thr_mgr->wait () != -1);
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%t) main thread finished\n")));
delete thread_start;
thread_start = 0;
delete signal_catcher;
signal_catcher = 0;
#else
ACE_ERROR ((LM_ERROR, ASYS_TEXT ("threads not supported on this platform\n")));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return 0;
}
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