summaryrefslogtreecommitdiff
path: root/examples/Threads/reader_writer.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'examples/Threads/reader_writer.cpp')
-rw-r--r--examples/Threads/reader_writer.cpp190
1 files changed, 0 insertions, 190 deletions
diff --git a/examples/Threads/reader_writer.cpp b/examples/Threads/reader_writer.cpp
deleted file mode 100644
index 5d343f1ab48..00000000000
--- a/examples/Threads/reader_writer.cpp
+++ /dev/null
@@ -1,190 +0,0 @@
-// This test program verifies the functionality of the ACE_OS
-// $Id$
-
-// implementation of readers/writer locks on Win32 and Posix pthreads.
-
-
-#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 int n_iterations = 1000;
-
-// Default number of loops.
-static int n_loops = 100;
-
-// Default number of readers.
-static int n_readers = 6;
-
-// Default number of writers.
-static int n_writers = 2;
-
-// Thread id of last writer.
-static volatile int shared_data;
-
-// Lock for shared_data.
-static ACE_RW_Mutex rw_mutex;
-
-// Count of the number of readers and writers.
-ACE_Atomic_Op<ACE_Thread_Mutex, int> current_readers, current_writers;
-
-// Thread manager
-static ACE_Thread_Manager thr_mgr;
-
-// Explain usage and exit.
-static void
-print_usage_and_die (void)
-{
- ACE_DEBUG ((LM_DEBUG,
- "usage: %n [-r n_readers] [-w n_writers] [-n iteration_count]\n"));
- ACE_OS::exit (1);
-}
-
-// Parse the command-line arguments and set options.
-static void
-parse_args (int argc, char *argv[])
-{
- ACE_Get_Opt get_opt (argc, argv, "r:w:n:l:");
-
- 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 = ACE_OS::atoi (get_opt.optarg);
- break;
- case 'l':
- n_loops = ACE_OS::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_Thread_Control tc (&thr_mgr);
- ACE_DEBUG ((LM_DEBUG, "(%t) reader starting\n"));
-
- for (int iterations = 1; iterations <= n_iterations; iterations++)
- {
- ACE_Read_Guard<ACE_RW_Mutex> g(rw_mutex);
- //int n = ++current_readers;
- //ACE_DEBUG ((LM_DEBUG, "(%t) I'm reader number %d\n", n));
-
- if (current_writers > 0)
- ACE_DEBUG ((LM_DEBUG, "(%t) writers found!!!\n"));
-
- int data = shared_data;
-
- for (int loop = 1; loop <= n_loops; loop++)
- {
- ACE_Thread::yield();
- if (shared_data != data)
- ACE_DEBUG ((LM_DEBUG,
- "(%t) somebody changed %d to %d\n",
- data, shared_data));
- }
-
- --current_readers;
- //ACE_DEBUG ((LM_DEBUG, "(%t) done with reading guarded data\n"));
-
- ACE_Thread::yield ();
- }
- 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_Thread_Control tc (&thr_mgr);
- ACE_DEBUG ((LM_DEBUG, "(%t) writer starting\n"));
-
- for (int iterations = 1; iterations <= n_iterations; iterations++)
- {
- ACE_Write_Guard<ACE_RW_Mutex> g(rw_mutex);
-
- ++current_writers;
- //ACE_DEBUG ((LM_DEBUG, "(%t) writing to guarded data\n"));
-
- if (current_writers > 1)
- ACE_DEBUG ((LM_DEBUG, "(%t) other writers found!!!\n"));
-
- if (current_readers > 0)
- ACE_DEBUG ((LM_DEBUG, "(%t) readers found!!!\n"));
-
- int self = (int) ACE_Thread::self ();
- shared_data = self;
-
- for (int loop = 1; loop <= n_loops; loop++)
- {
- ACE_Thread::yield();
- if (shared_data != self)
- ACE_DEBUG ((LM_DEBUG, "(%t) somebody wrote on my data %d\n", shared_data));
- }
-
- --current_writers;
-
- //ACE_DEBUG ((LM_DEBUG, "(%t) done with guarded data\n"));
- ACE_Thread::yield ();
- }
- return 0;
-}
-
-// Spawn off threads.
-
-int main (int argc, char *argv[])
-{
- ACE_LOG_MSG->open (argv[0]);
- parse_args (argc, argv);
-
- current_readers = 0; // Possibly already done
- current_writers = 0; // Possibly already done
-
- ACE_DEBUG ((LM_DEBUG, "(%t) main thread starting\n"));
-
- if (thr_mgr.spawn_n (n_readers, reader, 0, THR_NEW_LWP) == -1 ||
- thr_mgr.spawn_n (n_writers, writer, 0, THR_NEW_LWP) == -1)
- ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn_n"), 1);
-
- thr_mgr.wait ();
-
- ACE_DEBUG ((LM_DEBUG, "(%t) exiting main thread\n"));
- return 0;
-}
-
-#if defined (ACE_TEMPLATES_REQUIRE_SPECIALIZATION)
-template class ACE_Atomic_Op<ACE_Thread_Mutex, int>;
-template class ACE_Guard<ACE_RW_Mutex>;
-template class ACE_Read_Guard<ACE_RW_Mutex>;
-template class ACE_Write_Guard<ACE_RW_Mutex>;
-#endif /* ACE_TEMPLATES_REQUIRE_SPECIALIZATION */
-
-#else
-int
-main (int, char *[])
-{
- ACE_ERROR ((LM_ERROR, "threads not supported on this platform\n"));
- return 0;
-}
-#endif /* ACE_HAS_THREADS */
-