Twaek for improved flexiblity when shutting down

ChangeLog

@@ -1,3 +1,11 @@
+2019-07-12 Richard Frith-Macdonald <rfm@gnu.org>
+
+	* EcProcess.h:
+	* EcProcess.m:
+	Have ecHandleQuit call ecDidQuit in the main thread.  That way an
+	application can make the handling run in one thread, and still
+	have the final shutdown done in the main thread.
+
 2019-05-31  Richard Frith-Macdonald <rfm@gnu.org>
 
 	* EcProcess.h:

EcProcess.h

@@ -618,8 +618,9 @@ extern NSString*	cmdVersion(NSString *ver);
 /** Called once other stages of a graceful shutdown has completed in
  * order to perform final cleanup and have the process exit with the
  * expected status.<br />
- * Called automatically but subclasses overriding -ecHandleQuit may
- * call it explicitly at the end of the handling process.
+ * Called automatically in the main thread by the -ecHandleQuit method.
+ * Subclasses overriding -ecHandleQuit must call the superclass
+ * implementation at the end of their handling code.
  */
 - (oneway void) ecDidQuit;
 
@@ -647,7 +648,7 @@ extern NSString*	cmdVersion(NSString *ver);
  * Subclasses should not normally override this method. Instead override
  * the -ecHandleQuit method.<br />
  * For backward compatibility, this will call the -cmdQuit: method if a
- * subclass has overriden it.
+ * subclass has overridden it.
  */
 - (oneway void) ecQuitFor: (NSString*)reason with: (NSInteger)status; 
 

EcProcess.m

@@ -267,11 +267,12 @@ static NSTimeInterval   initAt = 0.0;
 /* Internal value for use only by quitting mechanism.
  */
 static NSTimeInterval   beganQuitting = 0.0;    // Start of orderly shutdown
+static BOOL		ecQuitHandled = NO;	// Has ecHandleQuit run?
 static NSInteger        ecQuitStatus = -1;      // Status for the quit
 static NSString         *ecQuitReason = nil;    // Reason for the quit
 static BOOL             ecWillAbort = NO;       // Abort on next quit
 
-/* Test to see if the process is tryiung to quit gracefully.
+/* Test to see if the process is trying to quit gracefully.
  * If quitting has taken over three minutes, abort immediately.
  */
 static BOOL
@@ -1996,7 +1997,6 @@ static NSString	*noFiles = @"No log files to archive";
   else
     {
       [self ecHandleQuit];
-      [self ecDidQuit];
     }
 }
 
@@ -2628,7 +2628,14 @@ static BOOL     ecDidAwaken = NO;
 
 - (void) ecHandleQuit
 {
-  return;
+  if (NO == ecIsQuitting())
+    {
+      [self ecWillQuit];
+    }
+  ecQuitHandled = YES;
+  [self performSelectorOnMainThread: @selector(ecDidQuit)
+			 withObject: nil
+		      waitUntilDone: NO];
 }
 
 - (BOOL) ecIsQuitting