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// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Semaphore Test
//
// = DESCRIPTION
// This test verifies the functionality of the ACE_Thread_Semaphore
// implementation.
//
// = AUTHOR
// Darrell Brunsch
//
// ============================================================================
#include "ace/Synch.h"
#include "ace/Thread.h"
#include "ace/Service_Config.h"
#include "ace/Get_Opt.h"
#include "test_config.h"
#if defined (ACE_HAS_THREADS)
// Semaphore used in the tests. Start it "locked" (i.e., its initial
// count is 0).
static ACE_Thread_Semaphore s (0);
// Default number of iterations.
static size_t n_iterations = 10;
static size_t n_workers = 10;
static size_t n_semcount = 3;
static size_t timeouts = 0;
// Explain usage and exit.
static void
print_usage_and_die (void)
{
ACE_DEBUG ((LM_DEBUG,
"usage: %n [-s n_semcount] [-w n_workers] [-n iteration_count]\n"));
ACE_OS::exit (1);
}
static void
parse_args (int argc, char *argv[])
{
ACE_Get_Opt get_opt (argc, argv, "s:w:n:");
int c;
while ((c = get_opt ()) != -1)
switch (c)
{
case 's':
n_semcount = ACE_OS::atoi (get_opt.optarg);
break;
case 'w':
n_workers = ACE_OS::atoi (get_opt.optarg);
break;
case 'n':
n_iterations = ACE_OS::atoi (get_opt.optarg);
break;
default:
print_usage_and_die ();
break;
}
}
// Tests the amount of time spent in a timed wait.
static int
test_timeout (void)
{
// Pick some random number of milliseconds.
ACE_Time_Value wait (0, (ACE_OS::rand () % 10) * 100000);
ACE_Time_Value begin = ACE_OS::gettimeofday ();
if (s.acquire (wait) == -1)
ACE_ASSERT (errno == ETIME);
ACE_Time_Value diff = ACE_OS::gettimeofday () - begin;
if (diff < wait)
{
ACE_DEBUG ((LM_DEBUG, "Timed wait fails length test\n"));
ACE_DEBUG ((LM_DEBUG, "Value: %d us, actual %d us\n",
wait.usec (),
diff.usec ()));
return -1;
}
return 0;
}
// Worker tries to acquire the semaphore, hold it for a while, and
// then releases it.
static void *
worker (void *)
{
ACE_NEW_THREAD;
for (size_t iterations = 1;
iterations <= n_iterations;
iterations++)
{
if (s.acquire (ACE_Time_Value (0, (ACE_OS::rand () % 1000) * 1000)))
++timeouts;
else
{
// Hold the lock for a while.
ACE_OS::sleep (ACE_Time_Value (0, (ACE_OS::rand () % 1000) * 1000));
s.release ();
}
ACE_Thread::yield ();
}
return 0;
}
#endif /* ACE_HAS_THREADS */
// Test semaphore functionality
int main (int argc, char *argv[])
{
ACE_START_TEST ("Semaphore_Test");
#if defined (ACE_HAS_THREADS)
parse_args (argc, argv);
ACE_OS::srand (ACE_OS::time (0L));
#if !defined (ACE_HAS_STHREADS)
// Test timed waits.
for (size_t i = 0; i < 5; i++)
test_timeout ();
// Initialize the semaphore to a certain number.
s.release (n_semcount);
if (ACE_Thread_Manager::instance ()->spawn_n
(n_workers, ACE_THR_FUNC (worker), 0, THR_NEW_LWP) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn_n"), 1);
ACE_Thread_Manager::instance ()->wait ();
size_t percent = (timeouts * 100) / (n_workers * n_iterations);
ACE_DEBUG ((LM_DEBUG,
"Worker threads timed out %d percent of the time\n", percent));
#else
ACE_ERROR ((LM_ERROR,
"Timed semaphores are not supported with native Solaris threads\n"));
#endif /* ACE_HAS_STHREADS */
#else
ACE_UNUSED_ARG (argc);
ACE_UNUSED_ARG (argv);
ACE_ERROR ((LM_ERROR, "Threads not supported on this platform\n"));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return 0;
}
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