new stacktrace function in libpbd3; variable size GUI request thread queues

git-svn-id: svn://localhost/trunk/ardour2@330 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/audioengine.cc

@@ -80,7 +80,7 @@ _thread_init_callback (void *arg)
 	   knows about it.
 	*/
 
-	PBD::ThreadCreated (pthread_self(), X_("Audioengine"));
+	PBD::ThreadCreatedWithRequestSize (pthread_self(), X_("Audioengine"), 4096);
 
 #ifdef VST_SUPPORT
 	if (Config->get_use_vst()) {

libs/ardour/session_midi.cc

@@ -1272,7 +1272,7 @@ Session::midi_thread_work ()
 	bool restart;
 	vector<MIDI::Port*> ports;
 
-	PBD::ThreadCreated (pthread_self(), X_("MIDI"));
+	PBD::ThreadCreatedWithRequestSize (pthread_self(), X_("MIDI"), 2048);
 
 	memset (&rtparam, 0, sizeof (rtparam));
 	rtparam.sched_priority = 9; /* XXX should be relative to audio (JACK) thread */

libs/gtkmm2ext/gtk_ui.cc

@@ -31,6 +31,7 @@
 #include <pbd/touchable.h>
 #include <pbd/failed_constructor.h>
 #include <pbd/pthread_utils.h>
+#include <pbd/stacktrace.h>
 
 #include <gtkmm2ext/gtk_ui.h>
 #include <gtkmm2ext/textviewer.h>
@@ -59,6 +60,7 @@ UI::UI (string name, int *argc, char ***argv, string rcfile)
 	}
 
 	PBD::ThreadCreated.connect (mem_fun (*this, &UI::register_thread));
+	PBD::ThreadCreatedWithRequestSize.connect (mem_fun (*this, &UI::register_thread_with_request_count));
 
 	_ok = false;
 	_active = false;
@@ -370,7 +372,13 @@ UI::timeout_add (unsigned int timeout, int (*func)(void *), void *arg)
 void
 UI::register_thread (pthread_t thread_id, string name)
 {
-	RingBufferNPT<Request>* b = new RingBufferNPT<Request> (128);
+	register_thread_with_request_count (thread_id, name, 256);
+}
+
+void
+UI::register_thread_with_request_count (pthread_t thread_id, string name, uint32_t num_requests)
+{
+	RingBufferNPT<Request>* b = new RingBufferNPT<Request> (num_requests);
 
 	{
 		PBD::LockMonitor lm (request_buffer_map_lock, __LINE__, __FILE__);

libs/gtkmm2ext/gtkmm2ext/gtk_ui.h

@@ -70,7 +70,9 @@ class UI : public AbstractUI
 	void call_slot_locked (sigc::slot<void>);
 	void touch_display (Touchable *);
 	void receive (Transmitter::Channel, const char *);
+
 	void register_thread (pthread_t, string);
+	void register_thread_with_request_count (pthread_t, string, uint32_t num_requests);
 
 	bool caller_is_gui_thread () { 
 		return pthread_equal (gui_thread, pthread_self());

libs/pbd3/SConscript

@@ -18,6 +18,7 @@ pathscanner.cc
 pool.cc
 pthread_utils.cc
 receiver.cc
+stacktrace.cc
 strsplit.cc
 textreceiver.cc
 transmitter.cc
@@ -31,6 +32,8 @@ xml++.cc
 conf = Configure(pbd3)
 if conf.CheckFunc('getmntent'):
     conf.env.Append(CCFLAGS="-DHAVE_GETMNTENT")
+if conf.CheckCHeader('execinfo.h'):
+    conf.env.Append(CXXFLAGS="-DHAVE_EXECINFO")
 pbd3 = conf.Finish()
 
 pbd3.Merge ([ libraries['sigc2'], libraries['xml'] ])

libs/pbd3/pbd/pthread_utils.h

@@ -16,6 +16,7 @@ std::string pthread_name ();
 
 namespace PBD {
   extern sigc::signal<void,pthread_t,std::string> ThreadCreated;
+  extern sigc::signal<void,pthread_t,std::string,uint32_t> ThreadCreatedWithRequestSize;
 }
 
 #endif /* __pbd_pthread_utils__ */

libs/pbd3/pbd/stacktrace.h

@@ -0,0 +1,10 @@
+#ifndef __libpbd_stacktrace_h__
+#define __libpbd_stacktrace_h__
+
+#include <ostream>
+
+namespace PBD {
+	void stacktrace (std::ostream& out);
+}
+
+#endif /* __libpbd_stacktrace_h__ */

libs/pbd3/pthread_utils.cc

@@ -21,6 +21,7 @@
 #include <map>
 #include <iostream>
 #include <string>
+#include <stdint.h>
 
 #include <pbd/pthread_utils.h>
 
@@ -34,6 +35,7 @@ static pthread_mutex_t thread_map_lock = PTHREAD_MUTEX_INITIALIZER;
 
 namespace PBD {
    sigc::signal<void,pthread_t,std::string> ThreadCreated;
+   sigc::signal<void,pthread_t,std::string,uint32_t> ThreadCreatedWithRequestSize;
 }
 
 using namespace PBD;

libs/pbd3/stacktrace.cc

@@ -0,0 +1,42 @@
+#include <pbd/stacktrace.h>
+#include <iostream>
+
+/* Obtain a backtrace and print it to stdout. */
+
+#ifdef HAVE_EXECINFO
+
+#include <execinfo.h>
+#include <stdlib.h>
+
+void
+PBD::stacktrace (std::ostream& out)
+{
+	void *array[200];
+	size_t size;
+	char **strings;
+	size_t i;
+     
+	size = backtrace (array, 200);
+	strings = backtrace_symbols (array, size);
+     
+	if (strings) {
+
+		printf ("Obtained %zd stack frames.\n", size);
+		
+		for (i = 0; i < size; i++) {
+			out << strings[i] << std::endl;
+		}
+		
+		free (strings);
+	}
+}
+
+#else
+
+void
+PBD::stacktrace (std::ostream& out)
+{
+	out << "stack tracing is not enabled on this platform" << std::endl;
+}
+
+#endif /* HAVE_EXECINFO */