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// $Id$
// ============================================================================
//
// = LIBRARY
// examples
//
// = FILENAME
// rw_locks.cpp
//
// = DESCRIPTION
// test_rw_locks shows how to use ACE_Local_RLock, ACE_Local_WLock,
// ACE_Remote_RLock, and ACE_Remote_WLock.
//
// = AUTHOR
// Tim Harrison
//
// ============================================================================
#include "ace/Get_Opt.h"
#include "ace/Local_Tokens.h"
#include "ace/Remote_Tokens.h"
#include "ace/Thread_Manager.h"
#include "ace/Token_Invariants.h"
#if defined (ACE_HAS_THREADS) && defined (ACE_HAS_THREADS_LIBRARY)
ACE_RCSID(rw_lock, rw_locks, "$Id$")
typedef ACE_Token_Invariant_Manager ACE_TOKEN_INVARIANTS;
static ACE_Token_Proxy *global_rlock;
static ACE_Token_Proxy *global_wlock;
static const char *server_host = ACE_DEFAULT_SERVER_HOST;
static int server_port = ACE_DEFAULT_SERVER_PORT;
static int ignore_deadlock = 0;
static int threads = 2;
static int iterations = 50;
static int debug = 0;
static int remote = 0;
static int reads = 4;
static int write_sleep = 0;
static int renew = 0;
static void *
run_thread (void *)
{
for (int x = 0; x < iterations; x++)
{
int y = 0;
for (; y < reads; y++)
{
if (global_rlock->acquire () == -1)
{
if (ACE_Log_Msg::instance ()->errnum () == EDEADLK)
{
ACE_DEBUG ((LM_DEBUG, "rlock deadlock detected\n"));
goto READ_DEADLOCK;
}
else return 0;
}
if (ACE_TOKEN_INVARIANTS::instance ()->acquired (global_rlock) == 0)
ACE_ERROR_RETURN ((LM_ERROR, "reader acquire violated invariant.\n"), 0);
ACE_DEBUG ((LM_DEBUG, "(%t) rlock acquired.\n"));
}
if (renew)
{
ACE_TOKEN_INVARIANTS::instance ()->releasing (global_rlock);
if (global_rlock->renew () == -1)
{
if (ACE_Log_Msg::instance ()->errnum () == EDEADLK)
{
ACE_DEBUG ((LM_DEBUG, "rlock deadlock detected during renew\n"));
goto READ_DEADLOCK;
}
else return 0;
}
ACE_DEBUG ((LM_DEBUG, "(%t) rlock renewed.\n"));
if (ACE_TOKEN_INVARIANTS::instance ()->acquired (global_rlock) == 0)
ACE_ERROR_RETURN ((LM_ERROR, "reader renew violated invariant.\n"), 0);
}
READ_DEADLOCK:
for (; y > 0; y--)
{
ACE_TOKEN_INVARIANTS::instance ()->releasing (global_rlock);
if (global_rlock->release () == 0)
ACE_DEBUG ((LM_DEBUG, "(%t) r-released.\n"));
}
if (global_wlock->acquire () == -1)
ACE_DEBUG ((LM_DEBUG, "wlock deadlock detected\n"));
else
{
if (write_sleep)
ACE_OS::sleep (1);
ACE_DEBUG ((LM_DEBUG, "\t\t(%t) wlock acquired.\n"));
if (ACE_TOKEN_INVARIANTS::instance ()->acquired (global_wlock) == 0)
ACE_ERROR_RETURN ((LM_ERROR, "writer acquire violated invariant.\n"), 0);
if (renew)
{
ACE_TOKEN_INVARIANTS::instance ()->releasing (global_wlock);
if (global_wlock->renew () == -1)
{
if (ACE_Log_Msg::instance ()->errnum () == EDEADLK)
{
ACE_DEBUG ((LM_DEBUG, "wlock deadlock detected during renew\n"));
}
else return 0;
}
ACE_DEBUG ((LM_DEBUG, "(%t) rlock renewed.\n"));
if (ACE_TOKEN_INVARIANTS::instance ()->acquired (global_wlock) == 0)
ACE_ERROR_RETURN ((LM_ERROR, "writer renew violated invariant.\n"), 0);
}
ACE_TOKEN_INVARIANTS::instance ()->releasing (global_wlock);
if (global_wlock->release () == 0)
ACE_DEBUG ((LM_DEBUG, "\t\t(%t) w-released.\n"));
}
}
ACE_DEBUG ((LM_DEBUG, "(%t) thread exiting.\n"));
return 0;
}
static int
parse_args (int argc, char *argv[])
{
ACE_LOG_MSG->open (argv[0], ACE_Log_Msg::STDERR); // | ACE_Log_Msg::VERBOSE);
ACE_Get_Arg_Opt get_opt (argc, argv, "t:iun:dr:sp:h:R", 1);
for (int c; (c = get_opt ()) != -1; )
{
switch (c)
{
case 'h': // specify the host machine on which the server is running
server_host = get_opt.opt_arg ();
remote = 1;
break;
case 'p': // specify the port on which the server is running
server_port = ACE_OS::atoi (get_opt.opt_arg ());
remote = 1;
break;
case 't':
threads = ACE_OS::atoi (get_opt.opt_arg ());
break;
case 'R':
renew = 1;
break;
case 'r':
reads = ACE_OS::atoi (get_opt.opt_arg ());
break;
case 'd':
debug = 1;
break;
case 's':
write_sleep = 1;
break;
case 'n':
iterations = ACE_OS::atoi (get_opt.opt_arg ());
break;
case 'i':
ignore_deadlock = 1;
break;
case 'u':
// usage: fallthrough
default:
ACE_ERROR_RETURN ((LM_ERROR,
"%n:\n"
"[-h <remote host>]\n"
"[-p <remote port>]\n"
"[-i ignore deadlock]\n"
"[-n <iterations>]\n"
"[-R perform renews]\n"
"[-r <reads>]\n"
"[-d debug]\n"
"[-s sleep during writes]\n"
"[-t <threads>\n", 1), -1);
}
}
return 0;
}
#if defined (ACE_HAS_PTHREADS)
#define SUSPEND 0
#else
#define SUSPEND THR_SUSPENDED
#endif
int
ACE_TMAIN (int argc, ACE_TCHAR* argv[])
{
if (parse_args (argc, argv) == -1)
return -1;
if (remote)
{
ACE_Remote_Mutex::set_server_address (ACE_INET_Addr (server_port, server_host));
global_rlock = (ACE_Token_Proxy *) new
ACE_Remote_RLock ("THE_TOKEN", ignore_deadlock, debug);
global_wlock = (ACE_Token_Proxy *) new
ACE_Remote_WLock ("THE_TOKEN", ignore_deadlock, debug);
}
else
{
global_rlock = (ACE_Token_Proxy *) new
ACE_Local_RLock ("THE_TOKEN", ignore_deadlock, debug);
global_wlock = (ACE_Token_Proxy *) new
ACE_Local_WLock ("THE_TOKEN", ignore_deadlock, debug);
}
ACE_Thread_Manager mgr;
if (mgr.spawn_n (threads, ACE_THR_FUNC (run_thread),
(void *) 0,
THR_BOUND | SUSPEND) == -1)
ACE_ERROR_RETURN ((LM_DEBUG, "%p\n", "spawn failed"), -1);
#if ! defined (ACE_HAS_PTHREADS)
if (mgr.resume_all () == -1)
ACE_ERROR_RETURN ((LM_DEBUG, "%p\n", "resume failed"), -1);
#endif
mgr.wait ();
return 0;
}
#else
int
ACE_TMAIN (int, ACE_TCHAR *[])
{
ACE_ERROR_RETURN ((LM_ERROR,
"threads not supported on this platform\n"), -1);
}
#endif /* ACE_HAS_THREADS */
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