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// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Thread_Mutex_Test.cpp
//
// = DESCRIPTION
// This is a simple test to illustrate the functionality of
// ACE_Thread_Mutex. The test acquires and releases mutexes. No
// command line arguments are needed to run the test.
//
// = AUTHOR
// Prashant Jain <pjain@cs.wustl.edu> and Doug Schmidt <schmidt@cs.wustl.edu>
//
// ============================================================================
#include "test_config.h"
#include "ace/Thread_Manager.h"
ACE_RCSID(tests, Thread_Mutex_Test, "$Id$")
#if defined (ACE_HAS_THREADS)
#if !defined (ACE_HAS_MUTEX_TIMEOUTS)
static int reported_notsup = 0;
#endif
static void *
test (void *args)
{
ACE_Thread_Mutex *mutex = (ACE_Thread_Mutex *) args;
ACE_UNUSED_ARG (mutex); // Suppress ghs warning about unused local "mutex".
ACE_OS::srand (ACE_OS::time (0));
for (size_t i = 0; i < ACE_MAX_ITERATIONS / 2; i++)
{
int result = 0;
// First attempt to acquire the mutex with a timeout to verify
// that mutex timeouts are working.
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) = trying timed acquire on ")
ACE_TEXT ("iteration %d\n"),
i));
ACE_Time_Value delta (1, 0); // One second timeout
ACE_Time_Value timeout = ACE_OS::gettimeofday ();
timeout += delta; // Must pass absolute time to acquire().
if (mutex->acquire (timeout) != 0)
{
if (errno == ETIMEDOUT)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) = mutex acquisition ")
ACE_TEXT ("timed out\n")));
}
else if (errno == ENOTSUP)
{
#if !defined (ACE_HAS_MUTEX_TIMEOUTS)
if (!reported_notsup)
{
ACE_DEBUG ((LM_INFO,
ACE_TEXT ("(%P|%t) %p, but ACE_HAS_MUTEX_TIMEOUTS is not defined - Ok\n"),
ACE_TEXT ("mutex timed acquire")));
reported_notsup = 1;
}
#else
ACE_DEBUG ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p - maybe ACE_HAS_MUTEX_TIMEOUTS should not be defined?\n"),
ACE_TEXT ("mutex timed acquire")));
#endif /* ACE_HAS_MUTEX_TIMEOUTS */
}
else
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%P|%t) %p\n%a"),
ACE_TEXT ("mutex timeout failed\n")));
return 0;
}
}
else
{
result = mutex->release ();
ACE_ASSERT (result == 0);
}
// Now try the standard mutex.
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) = trying to acquire on iteration %d\n"),
i));
result = mutex->acquire ();
ACE_ASSERT (result == 0);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) = acquired on iteration %d\n"),
i));
// Sleep for a random amount of time between 0 and 2 seconds.
// Note that it's ok to use rand() here because we are running
// within the critical section defined by the Thread_Mutex.
ACE_OS::sleep (ACE_OS::rand () % 2);
result = mutex->release ();
ACE_ASSERT (result == 0);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P|%t) = released on iteration %d\n"),
i));
}
return 0;
}
#endif /* ACE_HAS_THREADS */
static void
spawn (void)
{
#if defined (ACE_HAS_THREADS)
ACE_Thread_Mutex mutex;
const u_int n_threads =
#if defined (__Lynx__)
3; /* It just doesn't work with 4 threads. */
#else /* ! __Lynx__ */
ACE_MAX_THREADS;
#endif /* ! __Lynx_- */
if (ACE_Thread_Manager::instance ()->spawn_n (n_threads,
ACE_THR_FUNC (test),
(void *) &mutex,
THR_NEW_LWP | THR_DETACHED) == -1)
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("%p\n%a"),
ACE_TEXT ("thread create failed")));
// Wait for the threads to exit.
ACE_Thread_Manager::instance ()->wait ();
#else
ACE_ERROR ((LM_INFO,
ACE_TEXT ("threads not supported on this platform\n")));
#endif /* ACE_HAS_THREADS */
}
int
main (int, ACE_TCHAR *[])
{
ACE_START_TEST (ACE_TEXT ("Thread_Mutex_Test"));
spawn ();
ACE_END_TEST;
return 0;
}
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