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//=============================================================================
/**
* @file SV_Shared_Memory_Test.cpp
*
* This is a simple test of <ACE_SV_Shared_Memory> and
* <ACE_Malloc> using the <ACE_Shared_Memory_Pool>. The test
* forks two processes and then executes client and server
* allowing them to exchange data using shared memory. No user
* input is required as far as command line arguments are
* concerned.
*
* @author Prashant Jain <pjain@cs.wustl.edu> and Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
*/
//=============================================================================
#include "test_config.h"
#include "ace/Malloc_T.h"
#include "ace/Shared_Memory_Pool.h"
#include "ace/SV_Semaphore_Simple.h"
#include "ace/SV_Semaphore_Complex.h"
#include "ace/OS_NS_unistd.h"
#if defined (ACE_HAS_SYSV_IPC) && !defined(ACE_LACKS_SYSV_SHMEM)
// The shared memory allocator, which uses up the ACE_DEFAULT_SEM_KEY.
// We hide the allocator inside this function so that it doesn't get
// constructed until after the ACE_Object_Manager gets constructed,
// even with ACE_HAS_NONSTATIC_OBJECT_MANAGER.
static
ACE_Malloc<ACE_SHARED_MEMORY_POOL, ACE_SV_Semaphore_Simple> &
myallocator ()
{
static ACE_Malloc<ACE_SHARED_MEMORY_POOL,
ACE_SV_Semaphore_Simple> myallocator;
return myallocator;
}
// Create some more keys that are different from the
// ACE_DEFAULT_SEM_KEY used by the allocator.
static const int SEM_KEY_1 = ACE_DEFAULT_SEM_KEY + 1;
static const int SEM_KEY_2 = ACE_DEFAULT_SEM_KEY + 2;
static const int SHMSZ = 27;
static const char SHMDATA[SHMSZ] = "abcdefghijklmnopqrstuvwxyz";
static ACE_SV_Semaphore_Complex *parent_mutex = 0;
static ACE_SV_Semaphore_Complex *parent_synch = 0;
static int
parent (char *shm)
{
// This for loop executes in a critical section proteced by
// <parent_mutex>.
for (int i = 0; i < SHMSZ; i++)
shm[i] = SHMDATA[i];
int result;
result = parent_mutex->release ();
ACE_TEST_ASSERT (result != -1);
result = parent_synch->acquire ();
ACE_TEST_ASSERT (result != -1);
result = myallocator ().remove ();
ACE_TEST_ASSERT (result != -1);
result = parent_mutex->remove ();
ACE_TEST_ASSERT (result != -1);
result = parent_synch->remove ();
ACE_TEST_ASSERT (result != -1);
return 0;
}
static int
child (char *shm)
{
int result;
ACE_SV_Semaphore_Complex mutex;
// This semaphore is initially created with a count of 0, i.e., it
// is "locked."
result = mutex.open (SEM_KEY_1,
ACE_SV_Semaphore_Complex::ACE_CREATE,
0);
ACE_TEST_ASSERT (result != -1);
ACE_SV_Semaphore_Complex synch;
// This semaphore is initially created with a count of 0, i.e., it
// is "locked."
result = synch.open (SEM_KEY_2,
ACE_SV_Semaphore_Complex::ACE_CREATE,
0);
ACE_TEST_ASSERT (result != -1);
// Perform "busy waiting" here until we acquire the semaphore. This
// isn't really a good design -- it's just to illustrate that you
// can do non-blocking acquire() calls with the ACE System V
// semaphore wrappers.
while ((result = mutex.tryacquire ()) == -1)
if (errno == EAGAIN)
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P) spinning in child!\n")));
else
{
ACE_ERROR ((LM_ERROR,
ACE_TEXT ("(%P) child mutex.tryacquire")));
ACE_TEST_ASSERT (result != -1);
}
for (int i = 0; i < SHMSZ; i++)
ACE_TEST_ASSERT (SHMDATA[i] == shm[i]);
result = synch.release ();
ACE_TEST_ASSERT (result != -1);
return 0;
}
#endif /* ACE_HAS_SYSV_IPC */
int
run_main (int, ACE_TCHAR *[])
{
ACE_START_TEST (ACE_TEXT ("SV_Shared_Memory_Test"));
#if defined (ACE_HAS_SYSV_IPC) && !defined (ACE_LACKS_FORK) && \
!defined(ACE_LACKS_SYSV_SHMEM)
// Check whether allocator was initialized.
if (myallocator ().bad ())
{
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("Unable to initialize allocator\n")),
-1);
}
char *shm = reinterpret_cast<char *> (myallocator ().malloc (SHMSZ));
// Create the mutex and synch before spawning the child process, to
// avoid race condition between their creation in the parent and use
// in the child.
ACE_NEW_RETURN (parent_mutex,
ACE_SV_Semaphore_Complex,
-1);
ACE_NEW_RETURN (parent_synch,
ACE_SV_Semaphore_Complex,
-1);
// This semaphore is initially created with a count of 0, i.e., it
// is "locked."
int result = parent_mutex->open (SEM_KEY_1,
ACE_SV_Semaphore_Complex::ACE_CREATE,
0);
ACE_TEST_ASSERT (result != -1);
// This semaphore is initially created with a count of 0, i.e., it
// is "locked."
result = parent_synch->open (SEM_KEY_2,
ACE_SV_Semaphore_Complex::ACE_CREATE,
0);
ACE_TEST_ASSERT (result != -1);
switch (ACE_OS::fork (ACE_TEXT ("SV_Shared_Memory_Test.cpp")))
{
case -1:
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("(%P) fork failed\n")),
-1);
/* NOTREACHED */
case 0:
child (shm);
break;
default:
parent (shm);
delete parent_mutex;
delete parent_synch;
break;
}
#else
ACE_ERROR ((LM_INFO,
ACE_TEXT ("SYSV IPC, SYSV SHMEM, or fork ")
ACE_TEXT ("are not supported on this platform\n")));
#endif /* ACE_HAS_SYSV_IPC */
ACE_END_TEST;
return 0;
}
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