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// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Priority_Task_Test.cpp
//
// = DESCRIPTION
// This is a simple test to illustrate the priority mechanism of
// ACE Tasks.
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#include "ace/Task.h"
#include "ace/Sched_Params.h"
#include "test_config.h"
#if defined (ACE_HAS_THREADS)
class Priority_Task : public ACE_Task<ACE_MT_SYNCH>
// = TITLE
// A simple Task that runs itself a different priorities.
//
// = DESCRIPTION
// This task uses the void* argument on open to run the svc() method
// at a different priority. The point is execise the thread priority
// features of ACE.
{
public:
Priority_Task (void);
// The constructor
int open (void *);
// Receives the priority and run svc() on a separate thread at that
// priority.
int svc (void);
// Runs on a separate thread an checks the priority.
int succeeded (void) { return error_ == 0; }
// Returns 1 if priority was set properly, 0 otherwise.
private:
int priority_;
u_int error_;
};
Priority_Task::Priority_Task (void)
: ACE_Task<ACE_MT_SYNCH> (ACE_Thread_Manager::instance ()),
priority_ (0),
error_ (0)
{
}
int
Priority_Task::open (void *arg)
{
this->priority_ = *(int *) arg;
long flags = THR_NEW_LWP;
// To get FIFO scheduling with PTHREADS.
flags |= THR_SCHED_FIFO;
// Become an active object.
if (this->activate (flags, 1, 0, this->priority_) == -1)
{
// On Linux, only the superuser can set the policy to other than
// ACE_SCHED_OTHER. But with ACE_SCHED_OTHER, there is only 1
// thread priority value, 0. So, let the superuser run an
// interesting test, but for other users use priority 0.
ACE_DEBUG ((LM_DEBUG, "(%t) task activation at priority %d with flags "
"%ld failed; retry at priority 0 with with flags "
"%ld\n",
this->priority_, flags, THR_NEW_LWP));
flags = THR_NEW_LWP;
this->priority_ = 0;
if (this->activate (flags, 1, 1, this->priority_) == -1)
ACE_DEBUG ((LM_ERROR, "(%t) task activation at priority 0 failed, exiting!\n%a", -1));
}
return 0;
}
int
Priority_Task::svc (void)
{
ACE_hthread_t thr_handle;
ACE_Thread::self (thr_handle);
int prio;
if (ACE_Thread::getprio (thr_handle, prio) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "getprio failed"), -1);
if (prio == this->priority_)
ACE_DEBUG ((LM_DEBUG, "(%t) actual prio of %d equals desired priority\n",
prio));
else
{
ACE_DEBUG ((LM_ERROR, "(%t) actual prio = %d, desired priority_ = %d!\n",
prio, this->priority_));
++error_;
}
return 0;
}
#endif /* ACE_HAS_THREADS */
int
main (int, char *[])
{
ACE_START_TEST ("Priority_Task_Test");
int status = 0;
#if defined (ACE_HAS_THREADS)
Priority_Task tasks[ACE_MAX_ITERATIONS];
int i;
// Spawn off ACE_MAX_ITERATIONS of tasks, passing each one their
// iteration number as their priority.
// NOTE: on Solaris, for example, this requests the min FIFO
// priority. But, this test doesn't use the Realtime scheduling
// class. The FIFO priorities are used because they're all
// nonnegative.
ACE_Sched_Priority_Iterator priority (ACE_SCHED_FIFO,
ACE_SCOPE_THREAD);
for (i = 0; i < ACE_MAX_ITERATIONS; i++)
{
int p = priority.priority ();
tasks[i].open ((void *) &p);
// If there are more priorities get the next one...
if (priority.more ())
priority.next ();
}
ACE_DEBUG ((LM_DEBUG, "(%t) %d tasks spawned, wait for them to exit . . .\n",
ACE_MAX_ITERATIONS));
// Wait for all tasks to exit.
ACE_Thread_Manager::instance ()->wait ();
for (i = 0; i < ACE_MAX_ITERATIONS; i++)
{
if (! tasks[i].succeeded ())
{
++status;
break;
}
}
#else
ACE_ERROR ((LM_ERROR, "threads not supported on this platform\n"));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return status;
}
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