diff options
Diffstat (limited to 'examples/Reactor')
| -rw-r--r-- | examples/Reactor/Misc/signal_tester.cpp | 221 | ||||
| -rw-r--r-- | examples/Reactor/Misc/test_signals.cpp | 226 |
2 files changed, 0 insertions, 447 deletions
diff --git a/examples/Reactor/Misc/signal_tester.cpp b/examples/Reactor/Misc/signal_tester.cpp deleted file mode 100644 index 37613f14f38..00000000000 --- a/examples/Reactor/Misc/signal_tester.cpp +++ /dev/null @@ -1,221 +0,0 @@ -// Perform an extensive test of the ACE_Reactor's event dispatching -// $Id$ - -// mechanisms. These mechanisms illustrate how signals, I/O, and -// timeout events can all be handled within the same framework. In -// addition, this example illustrates how to use the ACE_Reactor for -// devices that perform I/O via signals (such as SVR4 message queues). - - -#include "ace/Service_Config.h" - -// Used to shut down the event loop. -static sig_atomic_t done = 0; - -// This class illustrates how to handle signal-driven I/O using the -// ACE_Reactor framework. Note that signals may be caught and -// processed without requiring the use of global signal handler -// functions or global signal handler data. - -class Sig_Handler : public ACE_Event_Handler -{ -public: - Sig_Handler (void); - virtual ACE_HANDLE get_handle (void) const; - virtual int handle_input (ACE_HANDLE); - virtual int shutdown (ACE_HANDLE, ACE_Reactor_Mask); - virtual int handle_signal (ACE_HANDLE signum, siginfo_t * = 0, - ucontext_t * = 0); - -private: - ACE_HANDLE handle_; -}; - -// A dummy_handle is required to reserve a slot in the ACE_Reactor's -// descriptor table. - -Sig_Handler::Sig_Handler (void) -{ - // Assign the Sig_Handler a dummy I/O descriptor. Note that even - // though we open this file "Write Only" we still need to use the - // ACE_Event_Handler::NULL_MASK when registering this with the - // ACE_Reactor (see below). - this->handle_ = ACE_OS::open (ACE_DEV_NULL, O_WRONLY); - ACE_ASSERT (this->handle_ != -1); - - // Register signal handler object. Note that NULL_MASK is used to - // keep the ACE_Reactor from calling us back on the "/dev/null" - // descriptor. - if (ACE_Service_Config::reactor ()->register_handler - (this, ACE_Event_Handler::NULL_MASK) == -1) - ACE_ERROR ((LM_ERROR, "%p\n%a", "register_handler", 1)); - - // Create a sigset_t corresponding to the signals we want to catch. - ACE_Sig_Set sig_set; - - sig_set.sig_add (SIGINT); - sig_set.sig_add (SIGQUIT); - sig_set.sig_add (SIGALRM); - - // Register the signal handler object to catch the signals. - if (ACE_Service_Config::reactor ()->register_handler (sig_set, this) == -1) - ACE_ERROR ((LM_ERROR, "%p\n%a", "register_handler", 1)); -} - -// Called by the ACE_Reactor to extract the fd. - -ACE_HANDLE -Sig_Handler::get_handle (void) const -{ - return this->handle_; -} - -// In a real application, this method would be where the read on the -// signal-driven I/O device would occur asynchronously. For now we'll -// just print a greeting to let you know that everything is working -// properly! - -int -Sig_Handler::handle_input (ACE_HANDLE) -{ - ACE_DEBUG ((LM_DEBUG, "handling asynchonrous input...\n")); - return 0; -} - -// In a real application, this method would do any cleanup activities -// required when shutting down the I/O device. - -int -Sig_Handler::shutdown (ACE_HANDLE, ACE_Reactor_Mask) -{ - ACE_DEBUG ((LM_DEBUG, "closing down Sig_Handler...\n")); - return 0; -} - -// This method handles all the signals that are being caught by this -// object. In our simple example, we are simply catching SIGALRM, -// SIGINT, and SIGQUIT. Anything else is logged and ignored. -// -// There are several advantages to using this approach. First, -// the behavior triggered by the signal is handled in the main event -// loop, rather than in the signal handler. Second, the ACE_Reactor's -// signal handling mechanism eliminates the need to use global signal -// handler functions and data. - -int -Sig_Handler::handle_signal (int signum, siginfo_t *, ucontext_t *) -{ - ACE_DEBUG ((LM_DEBUG, "received signal %S\n", signum)); - - switch (signum) - { - case SIGALRM: - // Rearm the alarm. - ACE_OS::alarm (4); - break; - case SIGINT: - // Tell the ACE_Reactor to enable the ready bit for - // this->handle_. The ACE_Reactor will subsequently call the - // Sig_Handler::handle_input method from within its event loop. - return ACE_Service_Config::reactor ()->ready_ops - (this->handle_, ACE_Event_Handler::READ_MASK, ACE_Reactor::ADD_MASK); - case SIGQUIT: - ACE_DEBUG ((LM_DEBUG, "%S: shutting down signal tester\n", signum)); - ACE_Service_Config::end_reactor_event_loop (); - break; - default: - ACE_DEBUG ((LM_DEBUG, - "%S: not handled, returning to program\n", signum)); - break; - } - return 0; -} - -// This class illustrates that the ACE_Reactor can handle signals, -// STDIO, and timeouts using the same mechanisms. - -class STDIN_Handler : public ACE_Event_Handler -{ -public: - STDIN_Handler (void); - virtual int handle_input (ACE_HANDLE); - virtual int handle_timeout (const ACE_Time_Value &, - const void *arg); -}; - -STDIN_Handler::STDIN_Handler (void) -{ - if (ACE::register_stdin_handler (this, - ACE_Service_Config::reactor (), - ACE_Service_Config::thr_mgr ()) == -1) - ACE_ERROR ((LM_ERROR, "%p\n", "register_stdin_handler")); - - // Register the STDIN_Handler to be dispatched once every second. - else if (ACE_Service_Config::reactor ()->schedule_timer - (this, 0, ACE_Time_Value (1), ACE_Time_Value (1)) == -1) - ACE_ERROR ((LM_ERROR, "%p\n%a", "schedule_timer", 1)); -} - -int -STDIN_Handler::handle_timeout (const ACE_Time_Value &tv, - const void *) -{ - ACE_DEBUG ((LM_DEBUG, "timeout occurred at %d sec, %d usec\n", - tv.sec (), tv.usec ())); - return 0; -} - -// Read from input descriptor and write to stdout descriptor. - -int -STDIN_Handler::handle_input (ACE_HANDLE handle) -{ - ssize_t n; - char buf[BUFSIZ]; - - switch (n = ACE_OS::read (handle, buf, sizeof buf)) - { - case -1: - if (errno == EINTR) - return 0; - /* NOTREACHED */ - else - ACE_ERROR ((LM_ERROR, "%p\n", "read")); - /* FALLTHROUGH */ - case 0: - ACE_Service_Config::end_reactor_event_loop (); - break; - default: - { - ssize_t result = ACE::write_n (ACE_STDOUT, buf, n); - - if (result != n) - ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "write"), - result == -1 && errno == EINTR ? 0 : -1); - } - } - return 0; -} - -int -main (int argc, char *argv[]) -{ - ACE_Service_Config daemon (argv [0]); - - // Signal handler. - Sig_Handler sh; - - // Define an I/O handler object. - STDIN_Handler ioh; - - // Optionally start the alarm. - if (argc > 1) - ACE_OS::alarm (4); - - // Loop handling signals and I/O events until SIGQUIT occurs. - - while (daemon.reactor_event_loop_done () == 0) - daemon.run_reactor_event_loop (); - - return 0; -} diff --git a/examples/Reactor/Misc/test_signals.cpp b/examples/Reactor/Misc/test_signals.cpp deleted file mode 100644 index 6493667de12..00000000000 --- a/examples/Reactor/Misc/test_signals.cpp +++ /dev/null @@ -1,226 +0,0 @@ -// Test the ability of the Reactor/Signal_Handler to register multiple -// $Id$ - -// handler per-signal. - -/* This test works as follows: - - 1. To test the "original" semantics of ACE (i.e., only one - ACE_Event_Handler can be registered per signal), you don't - need to do anything special. Existing programs work the - same since giving the Reactor's constructor a 0 value - (which is the default argument, BTW) instructs it to behave - as before. When a 0 is given, the ACE_Reactor's - constructor/open method creates an instance of - ACE_Sig_Handler and assigns this to an internal pointer. - This pointer is then used to dispatch all signal-related - methods within the Reactor. The default ACE_Sig_Handler - only allows *one* ACE_Event_Handler to be registered - per-signal. - - To run this version of the test do the following: - - % ./test-signal - ./test_signals - waiting for SIGINT or SIGQUIT - ^C - signal Interrupt occurred in Sig_Handler_2 (fruity, 0, 0) with count = 1 - waiting for SIGINT or SIGQUIT - ^\ - signal Quit occurred in Sig_Handler_2 (fruity, 0, 0) with count = 2 - shutting down SIGQUIT in Sig_Handler_2 (fruity, 0, 0) - waiting for SIGINT or SIGQUIT - ^C - signal Interrupt occurred in Sig_Handler_2 (fruity, 0, 0) with count = 3 - waiting for SIGINT or SIGQUIT - ^\Quit (core dumped) - - Note that in this test only one handler (the last one -- - "Sig_Handler_2 (fruity)") is actually registered. BTW, the - core dump is the expected behavior since the default - disposition is restored when there are no more handlers - (see the code below). - - 2. To test the "multiple handlers per-signal semantics", you - need to pass the constructor/open method of the ACE_Reactor - a pointer to a an instance of ACE_Sig_Handlers (note the - plural "s"). ACE_Sig_Handlers is a class that derives from - ACE_Sig_Handler. The difference between these two classes - is that (1) ACE_Sig_Handlers::register_signal allows - multiple ACE_Event_Handlers to be registered per-signal and - (2) it enables SA_RESTART by default. This class also - implements Detlef Becker's algorithm for integrating ACE - signal handling with 3rd party libraries. - - To run this version of the test do the following: - - % ./test_signals 1 - - waiting for SIGINT or SIGQUIT - ^C - signal Interrupt occurred in external handler! - signal Interrupt occurred in Sig_Handler_1 (howdy, 3, 1) with count = 1 - shutting down SIGINT in Sig_Handler_1 (howdy, 3, 1) - signal Interrupt occurred in Sig_Handler_1 (doody, 5, 4) with count = 1 - shutting down SIGINT in Sig_Handler_1 (doody, 5, 4) - signal Interrupt occurred in Sig_Handler_2 (tutty, 7, 6) with count = 1 - signal Interrupt occurred in Sig_Handler_2 (fruity, 9, 8) with count = 1 - waiting for SIGINT or SIGQUIT - ^\ - signal Quit occurred in Sig_Handler_1 (howdy, 3, 1) with count = 2 - shutting down SIGQUIT in Sig_Handler_1 (howdy, 3, 1) - signal Quit occurred in Sig_Handler_1 (doody, 5, 4) with count = 2 - shutting down SIGQUIT in Sig_Handler_1 (doody, 5, 4) - signal Quit occurred in Sig_Handler_2 (tutty, 7, 6) with count = 2 - shutting down SIGQUIT in Sig_Handler_2 (tutty, 7, 6) - signal Quit occurred in Sig_Handler_2 (fruity, 9, 8) with count = 2 - shutting down SIGQUIT in Sig_Handler_2 (fruity, 9, 8) - waiting for SIGINT or SIGQUIT - ^C - signal Interrupt occurred in external handler! - signal Interrupt occurred in Sig_Handler_2 (tutty, 7, 6) with count = 3 - signal Interrupt occurred in Sig_Handler_2 (fruity, 9, 8) with count = 3 - waiting for SIGINT or SIGQUIT - ^\Quit (core dumped) - - When this test begins all four handlers are registered and - dispatched when a SIGINT or SIGQUIT occurs. After the - first SIGINT, the handle_signal method of the Sig_Handler_1 - objects unregister themselves. At that point there are 4 - SIGQUIT handlers left, but only 2 of our SIGINT handlers - left (and the 1 external handler). After the first - SIGQUIT, there are no SIGQUIT handlers left since they all - deregister themselves (which restores the "SIG_DFL" - disposition). On the second SIGINT there are only 3 - handlers left (2 of ours and 1 external). Finally, on the - second SIGQUIT we exit and dump core since that's what - happens with the default disposition for SIGQUIT. */ - -#include "ace/Log_Msg.h" -#include "ace/Reactor.h" - -class Sig_Handler_1 : public ACE_Event_Handler -{ -public: - Sig_Handler_1 (ACE_Reactor &reactor, char *msg) - : msg_ (msg), - count_ (0), - reactor_ (reactor) - { - // Register the signal handlers. - this->quit_sigkey_ = reactor.register_handler (SIGQUIT, this); - this->int_sigkey_ = reactor.register_handler (SIGINT, this); - - if (this->quit_sigkey_ == -1 || this->int_sigkey_ == -1) - ACE_ERROR ((LM_ERROR, "%p\n", "register_handler")); - } - - virtual int handle_signal (int signum, siginfo_t *, ucontext_t *) - { - this->count_++; - ACE_DEBUG ((LM_DEBUG, - "\nsignal %S occurred in Sig_Handler_1 (%s, %d, %d) with count = %d", - signum, this->msg_, this->int_sigkey_, this->quit_sigkey_, this->count_)); - if (this->count_ != 1 && signum == SIGQUIT) - { - if (this->reactor_.remove_handler (SIGQUIT, 0, 0, - this->quit_sigkey_) == -1) - ACE_ERROR ((LM_ERROR, "\n%p", "remove_handler")); - else - ACE_DEBUG ((LM_DEBUG, "\nshutting down SIGQUIT in Sig_Handler_1 (%s, %d, %d)", - this->msg_, this->int_sigkey_, this->quit_sigkey_)); - } - else if (this->count_ != 2 && signum == SIGINT) - { - if (this->reactor_.remove_handler (SIGINT, 0, 0, - this->int_sigkey_) == -1) - ACE_ERROR ((LM_ERROR, "\n%p", "remove_handler")); - else - ACE_DEBUG ((LM_DEBUG, "\nshutting down SIGINT in Sig_Handler_1 (%s, %d, %d)", - this->msg_, this->int_sigkey_, this->quit_sigkey_)); - } - return 0; - } - -protected: - char *msg_; - int count_; - int int_sigkey_; - int quit_sigkey_; - ACE_Reactor &reactor_; -}; - -class Sig_Handler_2 : public Sig_Handler_1 -{ -public: - Sig_Handler_2 (ACE_Reactor &reactor, char *msg) - : Sig_Handler_1 (reactor, msg) - { - } - - virtual int handle_signal (int signum, siginfo_t *, ucontext_t *) - { - this->count_++; - ACE_DEBUG ((LM_DEBUG, - "\nsignal %S occurred in Sig_Handler_2 (%s, %d, %d) with count = %d", - signum, this->msg_, this->int_sigkey_, this->quit_sigkey_, this->count_)); - if (this->count_ != 0 && signum == SIGQUIT) - { - if (this->reactor_.remove_handler (SIGQUIT, 0, 0, - this->quit_sigkey_) == -1) - ACE_ERROR ((LM_ERROR, "\n%p", "remove_handler")); - else - ACE_DEBUG ((LM_DEBUG, "\nshutting down SIGQUIT in Sig_Handler_2 (%s, %d, %d)", - this->msg_, this->int_sigkey_, this->quit_sigkey_)); - } - else - return 0; - } -}; - -static void -external_handler (int signum) -{ - ACE_DEBUG ((LM_DEBUG, "\nsignal %S occurred in external handler!", signum)); -} - -#if !defined (HPUX) -int -main (int argc, char *argv) -{ - // If argc > 1 then allow multiple handlers per-signal, else just - // allow 1 handler per-signal. - ACE_Sig_Handlers multi_handlers; - - ACE_Reactor reactor (argc > 1 ? &multi_handlers: 0); - - if (argc > 1) - { - // Register an "external" signal handler so that the - // ACE_Sig_Handlers code will have something to incorporate! - ACE_SignalHandler eh = ACE_SignalHandler (external_handler); - ACE_Sig_Action sa (eh); - - sa.register_action (SIGINT); - } - - // Create a bevy of handlers. - Sig_Handler_1 h1 (reactor, "howdy"), h2 (reactor, "doody"); - Sig_Handler_2 h3 (reactor, "tutty"), h4 (reactor, "fruity"); - - // Wait for user to type SIGINT and SIGQUIT. - - for (;;) - { - ACE_DEBUG ((LM_DEBUG, "\nwaiting for SIGINT or SIGQUIT\n")); - reactor.handle_events (); - } - return 0; -} -#else -int -main (void) -{ - ACE_ERROR_RETURN ((LM_ERROR, "The HP C++ compiler is too lame to support this feature\n"), -1); -} -#endif /* HPUX */ |