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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 <brunsch@cs.wustl.edu>
//
// ============================================================================
#include "test_config.h"
#include "ace/Thread_Semaphore.h"
#include "ace/Thread.h"
#include "ace/Thread_Manager.h"
#include "ace/Get_Opt.h"
#include "ace/OS_NS_sys_time.h"
#include "ace/OS_NS_time.h"
#include "ace/OS_NS_unistd.h"
ACE_RCSID(tests, Semaphore_Test, "$Id$")
// msec that times are allowed to differ before test fails.
#if defined (ACE_HAS_HI_RES_TIMER) || defined (ACE_HAS_AIX_HI_RES_TIMER) || \
defined (ACE_HAS_PENTIUM) || defined (ACE_HAS_ALPHA_TIMER) || \
defined (ACE_HAS_POWERPC_TIMER)
# define ACE_ALLOWED_SLACK 100
#else /* don't have a high-res timer */
# define ACE_ALLOWED_SLACK 1100
#endif /* don't have a high-res timer */
// Test results, 'success' is 0
static int test_result = 0;
#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 ((unsigned int) 0);
// Default number of iterations.
static int n_iterations = 10;
// Number of worker threads.
static size_t n_workers = 10;
// Amount to release the semaphore.
static u_int n_release_count = 3;
// Number of timeouts.
static size_t timeouts = 0;
// Number of times to call test_timeout ().
static size_t test_timeout_count = 3;
// Tests the amount of time spent in a timed wait.
static int
test_timeout (void)
{
int status = 0;
// milliseconds...
long msecs_expected;
long msecs_waited;
long msecs_diff;
// Wait a little longer each time
static long wait_secs = 3;
ACE_Time_Value wait = ACE_OS::gettimeofday ();
ACE_Time_Value begin = wait;
wait.sec (wait.sec () + wait_secs);
if (s.acquire (wait) == -1)
{
if (errno != ETIME)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("test_timeout should be ETIME but is")));
status = -1;
}
}
ACE_Time_Value wait_diff = ACE_OS::gettimeofday () - begin;
msecs_waited = wait_diff.msec ();
msecs_expected = wait_secs * 1000;
msecs_diff = labs (msecs_expected - msecs_waited);
if (msecs_diff > ACE_ALLOWED_SLACK)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("Timed wait fails length test\n")));
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("Expected %d ms, actual %d ms; %d allowed\n"),
(int)msecs_expected,
(int)msecs_waited,
(int)ACE_ALLOWED_SLACK));
status = -1;
}
++wait_secs;
return status;
}
// Explain usage and exit.
static void
print_usage_and_die (void)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("usage: %n [-s n_release_count] [-w n_workers] [-n iteration_count]\n")));
ACE_OS::exit (1);
}
static void
parse_args (int argc, ACE_TCHAR *argv[])
{
ACE_Get_Opt get_opt (argc, argv, ACE_TEXT ("s:w:n:"));
int c;
while ((c = get_opt ()) != -1)
switch (c)
{
case 's':
n_release_count = ACE_OS::atoi (get_opt.opt_arg ());
break;
case 'w':
n_workers = ACE_OS::atoi (get_opt.opt_arg ());
break;
case 'n':
n_iterations = ACE_OS::atoi (get_opt.opt_arg ());
break;
default:
print_usage_and_die ();
break;
}
}
// Worker tries to acquire the semaphore, hold it for a while, and
// then releases it.
static void *
worker (void *)
{
for (int iterations = 1;
iterations <= n_iterations;
iterations++)
{
//FUZZ: disable check_for_lack_ACE_OS
ACE_Time_Value wait (0,
iterations * 1000 * 100); // Wait 'iter' msec
//FUZZ: enable check_for_lack_ACE_OS
ACE_Time_Value tv = ACE_OS::gettimeofday () + wait;
if (s.acquire (tv) == -1)
{
// verify that we have ETIME
if (ACE_OS::last_error() != ETIME)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("Worker should be ETIME but is")));
}
else
++timeouts;
ACE_Time_Value diff = ACE_OS::gettimeofday ();
diff = diff - tv; // tv should have been reset to time acquired
long diff_msec = diff.msec ();
if (diff_msec > ACE_ALLOWED_SLACK)
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("Acquire fails time reset test\n")));
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("Diff btw now and returned time: %d ms; ")
ACE_TEXT ("%d allowed\n"),
(int)diff_msec,
(int)ACE_ALLOWED_SLACK));
test_result = 1;
}
// 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 run_main (int argc, ACE_TCHAR *argv[])
{
ACE_START_TEST (ACE_TEXT ("Semaphore_Test"));
#if defined (ACE_HAS_THREADS)
parse_args (argc, argv);
ACE_OS::srand ((u_int) ACE_OS::time (0L));
//Test timed waits.
for (size_t i = 0; i < test_timeout_count; i++)
if (test_timeout () != 0)
test_result = 1;
// Release the semaphore a certain number of times.
s.release (n_release_count);
if (ACE_Thread_Manager::instance ()->spawn_n
(static_cast<size_t> (n_workers),
ACE_THR_FUNC (worker),
0,
THR_NEW_LWP) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("spawn_n")),
1);
ACE_Thread_Manager::instance ()->wait ();
size_t percent = (timeouts * 100) / (n_workers * n_iterations);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Worker threads timed out %d percent of the time\n"),
(int)percent));
if (test_result == 0)
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("Semaphore Test successful\n")));
#else
ACE_UNUSED_ARG (argc);
ACE_UNUSED_ARG (argv);
ACE_ERROR ((LM_INFO,
ACE_TEXT ("Threads not supported on this platform\n")));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return test_result;
}
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