added ProcessScheduler>>processById:

attempting to correct signal handling behavior

moo/kernel/Except.moo

@@ -183,7 +183,11 @@ extend Context
 					ctx basicAt: pending_pos put: false.
 					eb value.
 				}*/
-				if (ctx basicAt: pending_pos test: true put: false) { eb value }.
+				if (ctx basicAt: pending_pos test: true put: false) 
+				{
+					// TODO: what is the best way to handle an exception raised in an ensure block?
+					[ eb value ] on: Exception do: [:ex | System logNl: "WARNING: unhandled exception in ensure block - " & ex messageText ].
+				}.
 			}.
 			stop := (ctx == context).
 			ctx := ctx sender.

moo/kernel/Process.moo

@@ -43,8 +43,15 @@ class(#pointer,#final,#limited) Process(Object)
 		// the process must not be scheduled.
 		// ----------------------------------------------------------------------------------------------------------
 
+		// if the current active process(thisProcess) is not the process to terminate(self),
+		// suspend the target process so that no scheduling wakes the process until this 
+		// termination is completed.
 		//if (Processor activeProcess ~~ self) { self suspend }.
 		if (thisProcess ~~ self) { self suspend }.
+
+		// TODO: what if there is another process that may resume this suspended process.
+		//       should i mark it unresumable?
+
 		self.currentContext unwindTo: self.initialContext return: nil.
 		^self _terminate
 	}
@@ -422,4 +429,7 @@ class(#final,#limited) ProcessScheduler(Object)
 
 	method activeProcess { ^self.active }
 	method resume: aProcess { ^aProcess resume }
+
+	method(#primitive,#lenient) _processById: id.
+	method(#primitive) processById: id.
 }

moo/kernel/System.moo

@@ -146,12 +146,33 @@ class System(Apex)
 			nil.
 		]
 		ensure: [
+			| pid proc |
 			os_intr_sem unsignal.
 
 			System logNl: '>>>>Requesting to terminate the caller process ' & (caller id) asString.
 			// the caller must request to terminate all its child processes..
-			// TODO: to avoid this, this process must enumerate all proceses and terminate them.
+			// TODO: to avoid this, this process must enumerate all proceses and terminate them except this and gcfin process
+
+/* TODO: redo the following process termination loop.
+         need to write a proper process enumeration methods. 
+           0 -> startup  <--- this should also be stored in the 'caller' variable.
+           1 -> __gc_finalizer
+           2 -> __os_signal_handler 
+           3 -> application main
+         the following loops starts from pid 3 up to 100.  this is POC only. i need to write a proper enumeration methods and use them.
+      */
+			pid := 3.
+			while (pid < 100) 
+			{
+				//proc := Processor processById: pid.
+				proc := Processor _processById: pid.
+				if (proc notError) { System logNl: ("Requesting to terminate process of id - " & pid asString). proc terminate }.
+				pid := pid + 1.
+			}.
+/* TODO: end redo */
+
 			caller terminate.
+			//(Processor _processById: 1) resume. <---- i shouldn't do ths. but, this system causes VM assertion failure. fix it....
 
 			System logNl: '>>>>End of OS signal handler process ' & (thisProcess id) asString.
 		].

moo/kernel/X11.moo

@@ -467,7 +467,7 @@ class X11.Composite(X11.Widget)
 		| link |
 		if (widget parent ~~ self)
 		{
-			selfns.Exception sinal: "Cannot remove an unknown widget"
+			selfns.Exception signal: "Cannot remove an unknown widget"
 		}.
 
 		link := self.children findIdenticalLink: widget.
@@ -573,6 +573,11 @@ extend X11
 		self.display_base dump.
 	}
 
+	method isConnected
+	{
+		^self.display_base notNil
+	}
+
 	method dispose
 	{
 		if (self.shell_container notNil)
@@ -625,7 +630,6 @@ extend X11
 			self.LLEventType.CLIENT_MESSAGE    -> #__handle_client_message:on:,
 			self.LLEventType.SHELL_CLOSE       -> #__handle_shell_close:on:
 		}.
-
 	}
 
 	method addShell: shell
@@ -653,6 +657,8 @@ extend X11
 			self.event_loop_sem := Semaphore new.
 			self.event_loop_sem signalOnInput: (self _get_fd).
 			self.event_loop_proc := [
+
+				[
 					| llevtbuf llevent ongoing |
 
 					llevtbuf := X11.LLEvent new.
@@ -677,15 +683,17 @@ extend X11
 							}.
 						}.
 					}.
+				] ensure: [
 
 'CLOSING X11 EVENT LOOP' dump.
 
 					self.event_loop_sem unsignal.
-		// TODO: LOOK HERE FOR RACE CONDITION
+			// TODO: LOOK HERE FOR RACE CONDITION with exitEventLoop.
 					self.event_loop_sem := nil.
 					self.event_loop_proc := nil.
 
-				self dispose.
+					[ self dispose ] on: Exception do: [:ex | ("WARNING: dispose failure...." & ex messageText) dump ].
+				]
 			] fork.
 		}
 	}
@@ -826,10 +834,22 @@ class MyObject(Object)
 		Fx new.
 		comp1 := Fx new.
 		Fx new.
+
+
+		while (self.disp1 isConnected or self.disp2 isConnected) { System sleepForSecs: 1 }.
 	}
 
+/*
+	method exitEventLoops
+	{
+		if (self.disp2 notNil) { self.disp2 exitEventLoop }.
+		if (self.disp1 notNil) { self.disp1 exitEventLoop }.
+	}
+*/
+
 	method(#class) main
 	{
+		// this method returns immediately while having forked two processes with X11 event loops.
 		^self new main1
 	}
 }

moo/lib/exec.c

@@ -615,6 +615,32 @@ static void terminate_process (moo_t* moo, moo_oop_process_t proc)
 					MOO_OOP_TO_SMOOI(moo->processor->suspended.count),
 					moo->sem_io_wait_count
 				);
+				if (MOO_OOP_TO_SMOOI(moo->processor->runnable.count) > 0)
+				{
+					moo_oop_process_t p;
+					MOO_LOG0 (moo, MOO_LOG_IC | MOO_LOG_DEBUG, "Runnable: ");
+					p = moo->processor->runnable.first;
+					while (p)
+					{
+						MOO_LOG1 (moo, MOO_LOG_IC | MOO_LOG_DEBUG, " %O", p->id);
+						if (p == moo->processor->runnable.last) break;
+						p = p->ps.next;
+					}
+					MOO_LOG0 (moo, MOO_LOG_IC | MOO_LOG_DEBUG, "\n");
+				}
+				if (MOO_OOP_TO_SMOOI(moo->processor->suspended.count) > 0)
+				{
+					moo_oop_process_t p;
+					MOO_LOG0 (moo, MOO_LOG_IC | MOO_LOG_DEBUG, "Suspended: ");
+					p = moo->processor->suspended.first;
+					while (p)
+					{
+						MOO_LOG1 (moo, MOO_LOG_IC | MOO_LOG_DEBUG, " %O", p->id);
+						if (p == moo->processor->suspended.last) break;
+						p = p->ps.next;
+					}
+					MOO_LOG0 (moo, MOO_LOG_IC | MOO_LOG_DEBUG, "\n");
+				}
 			}
 			else
 			{
@@ -2613,6 +2639,47 @@ static moo_pfrc_t pf_process_suspend (moo_t* moo, moo_mod_t* mod, moo_ooi_t narg
 	return MOO_PF_SUCCESS;
 }
 
+static moo_pfrc_t pf_process_scheduler_process_by_id (moo_t* moo, moo_mod_t* mod, moo_ooi_t nargs)
+{
+	moo_oop_t rcv, id;
+	moo_oop_process_t proc;
+
+	rcv = MOO_STACK_GETRCV(moo, nargs);
+	id = MOO_STACK_GETARG(moo, nargs, 0);
+
+	MOO_PF_CHECK_RCV (moo, rcv == (moo_oop_t)moo->processor);
+
+	if (MOO_OOP_IS_SMOOI(id))
+	{
+		proc = moo->processor->runnable.first;
+		while (proc)
+		{
+			if (proc->id == id) 
+			{
+				MOO_STACK_SETRET (moo, nargs, (moo_oop_t)proc);
+				return MOO_PF_SUCCESS;
+			}
+			if (proc == moo->processor->runnable.last) break;
+			proc = proc->ps.next;
+		}
+
+		proc = moo->processor->suspended.first;
+		while (proc)
+		{
+			if (proc->id == id) 
+			{
+				MOO_STACK_SETRET (moo, nargs, (moo_oop_t)proc);
+				return MOO_PF_SUCCESS;
+			}
+			if (proc == moo->processor->suspended.last) break;
+			proc = proc->ps.next;
+		}
+	}
+
+	MOO_STACK_SETRETTOERROR (moo, nargs, MOO_ENOENT);
+	return MOO_PF_FAILURE;
+}
+
 /* ------------------------------------------------------------------ */
 static moo_pfrc_t pf_semaphore_signal (moo_t* moo, moo_mod_t* mod, moo_ooi_t nargs)
 {
@@ -4114,6 +4181,8 @@ static pf_t pftab[] =
 	{ "MethodContext_findExceptionHandler:",   { pf_context_find_exception_handler,       1, 1 } },
 	{ "MethodContext_goto:",                   { pf_context_goto,                         1, 1 } },
 
+	{ "ProcessScheduler_processById:",         { pf_process_scheduler_process_by_id,      1, 1 } },
+
 	{ "Process_resume",                        { pf_process_resume,                       0, 0 } },
 	{ "Process_sp",                            { pf_process_sp,                           0, 0 } },
 	{ "Process_suspend",                       { pf_process_suspend,                      0, 0 } },