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Diffstat (limited to 'tests/Reader_Writer_Test.cpp')
| -rw-r--r-- | tests/Reader_Writer_Test.cpp | 265 |
1 files changed, 0 insertions, 265 deletions
diff --git a/tests/Reader_Writer_Test.cpp b/tests/Reader_Writer_Test.cpp deleted file mode 100644 index 623a3d487a2..00000000000 --- a/tests/Reader_Writer_Test.cpp +++ /dev/null @@ -1,265 +0,0 @@ -// $Id$ - -// ============================================================================ -// -// = LIBRARY -// tests -// -// = FILENAME -// Reader_Writer_Test.cpp -// -// = DESCRIPTION -// This test program verifies the functionality of the ACE_OS -// implementation of readers/writer locks on Win32 and Posix -// pthreads. -// -// = AUTHOR -// Prashant Jain and Doug C. Schmidt -// -// ============================================================================ - -#include "test_config.h" -#include "ace/Synch.h" -#include "ace/Thread.h" -#include "ace/Thread_Manager.h" -#include "ace/Get_Opt.h" - -#if defined (ACE_HAS_THREADS) - -// Default number of iterations. -static size_t n_iterations = 100; - -// Default number of loops. -static size_t n_loops = 100; - -// Default number of readers. -static size_t n_readers = 6; - -// Default number of writers. -static size_t n_writers = 4; - -// Thread id of last writer. -static ACE_thread_t shared_data; - -// Lock for shared_data. -static ACE_RW_Thread_Mutex rw_mutex; - -// Count of the number of readers and writers. -static ACE_Atomic_Op<ACE_Thread_Mutex, int> current_readers = 0; -static ACE_Atomic_Op<ACE_Thread_Mutex, int> current_writers = 0; - -// Explain usage and exit. -static void -print_usage_and_die (void) -{ - ACE_ERROR ((LM_ERROR, - "usage: %n [-r n_readers] [-w n_writers] [-n iteration_count]\n%a", - 1)); -} - -static void -parse_args (int argc, char *argv[]) -{ - ACE_Get_Opt get_opt (argc, argv, "r:w:n:"); - - int c; - - while ((c = get_opt ()) != -1) - switch (c) - { - case 'r': - n_readers = ACE_OS::atoi (get_opt.optarg); - break; - case 'w': - n_writers = ACE_OS::atoi (get_opt.optarg); - break; - case 'n': - n_iterations = atoi (get_opt.optarg); - break; - default: - print_usage_and_die (); - break; - } -} - -// Iterate <n_iterations> each time checking that nobody modifies the data -// while we have a read lock. - -static void * -reader (void *) -{ - ACE_DEBUG ((LM_DEBUG, - "(%t) reader starting\n")); - - // We use a random pause, around 2msec with 1msec jittering. - int usecs = 1000 + ACE_OS::rand () % 2000; - ACE_Time_Value pause (0, usecs); - - for (size_t iterations = 1; - iterations <= n_iterations; - iterations++) - { - ACE_OS::sleep (pause); - ACE_Read_Guard<ACE_RW_Mutex> g (rw_mutex); - - if (current_writers > 0) - ACE_DEBUG ((LM_DEBUG, - "(%t) reader error: writers found!!!\n")); - - ACE_thread_t data = shared_data; - - for (size_t loop = 1; loop <= n_loops; loop++) - { - ACE_Thread::yield (); - - if (ACE_OS::thr_equal (shared_data, data) == 0) - ACE_DEBUG ((LM_DEBUG, - "(%t) reader error: somebody changed %d to %d\n", - data, - shared_data)); - } - - if (rw_mutex.tryacquire_write_upgrade () != -1) - { - current_writers++; - - ACE_DEBUG ((LM_DEBUG, - "(%t) upgraded to write lock!\n")); - - ACE_thread_t self = ACE_Thread::self (); - - shared_data = self; - data = self; - - for (size_t loop = 1; loop <= n_loops; loop++) - { - if (ACE_OS::thr_equal (shared_data, data) == 0) - ACE_DEBUG ((LM_DEBUG, - "(%t) upgraded writer error: somebody changed %d to %d\n", - data, - shared_data)); - } - - --current_writers; - } - - --current_readers; - - ACE_DEBUG ((LM_DEBUG, - "(%t) reader finished %d iterations at %T\n", - iterations)); - } - return 0; -} - -// Iterate <n_iterations> each time modifying the global data and -// checking that nobody steps on it while we can write it. - -static void * -writer (void *) -{ - ACE_DEBUG ((LM_DEBUG, - "(%t) writer starting\n")); - - // We use a random pause, around 2 msec with 1 msec jittering. - int usecs = 1000 + ACE_OS::rand () % 2000; - ACE_Time_Value pause (0, usecs); - - for (size_t iterations = 1; - iterations <= n_iterations; - iterations++) - { - ACE_OS::sleep (pause); - - { - // Add an additional scope here to bound the duration that the - // write lock is held. - ACE_Write_Guard<ACE_RW_Mutex> g (rw_mutex); - - ++current_writers; - - if (current_writers > 1) - ACE_DEBUG ((LM_DEBUG, - "(%t) writer error: other writers found!!!\n")); - - if (current_readers > 0) - ACE_DEBUG ((LM_DEBUG, - "(%t) writer error: readers found!!!\n")); - - ACE_thread_t self = ACE_Thread::self (); - - shared_data = self; - - for (size_t loop = 1; - loop <= n_loops; - loop++) - { - ACE_Thread::yield (); - - if (ACE_OS::thr_equal (shared_data, self) == 0) - ACE_DEBUG ((LM_DEBUG, - "(%t) writer error: somebody wrote on my data %d\n", - shared_data)); - } - - --current_writers; - } - - ACE_DEBUG ((LM_DEBUG, - "(%t) writer done after %d iterations at %T\n", - iterations)); - } - - return 0; -} - -#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION) -template class ACE_Atomic_Op<ACE_Thread_Mutex, int>; -template class ACE_Read_Guard<ACE_RW_Mutex>; -template class ACE_Write_Guard<ACE_RW_Mutex>; -template class ACE_Guard<ACE_RW_Mutex>; -#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA) -#pragma instantiate ACE_Atomic_Op<ACE_Thread_Mutex, int> -#pragma instantiate ACE_Read_Guard<ACE_RW_Mutex> -#pragma instantiate ACE_Write_Guard<ACE_RW_Mutex> -#pragma instantiate ACE_Guard<ACE_RW_Mutex> -#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */ - -#endif /* ACE_HAS_THREADS */ - -// Spawn off threads. - -int main (int argc, char *argv[]) -{ - ACE_START_TEST ("Reader_Writer_Test"); - -#if defined (ACE_HAS_THREADS) - parse_args (argc, argv); - - ACE_DEBUG ((LM_DEBUG, - "(%t) main thread starting\n")); - - if (ACE_Thread_Manager::instance ()->spawn_n (n_readers, - ACE_THR_FUNC (reader), - 0, - THR_NEW_LWP) == -1) - ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn_n"), 1); - else if (ACE_Thread_Manager::instance ()->spawn_n (n_writers, - ACE_THR_FUNC (writer), - 0, - THR_NEW_LWP) == -1) - ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn_n"), 1); - - ACE_Thread_Manager::instance ()->wait (); - - ACE_DEBUG ((LM_DEBUG, - "(%t) exiting main thread\n")); -#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; -} |