shellthread - reset worker settings to default when thread made free

src/modules/shellthread-999999.0a1.0.tm

@@ -21,6 +21,8 @@ namespace eval shellthread {
 
 namespace eval shellthread::worker {
     variable settings
+    variable settings_defaults
+    set settings_defaults [list -raw 0 -file "" -syslog "" -direction out] ;#also used for reset when worker returned to free thread list
     variable sysloghost_port
     variable sock
     variable logfile ""
@@ -48,6 +50,7 @@ namespace eval shellthread::worker {
         variable sysloghost_port
         variable logfile
         variable settings
+        variable settings_defaults
         interp bgerror {} shellthread::worker::bgerror
         #package require overtype ;#overtype uses tcllib textutil, punk::char etc - currently too heavyweight in terms of loading time for use in threads.
         variable client_ids
@@ -55,8 +58,7 @@ namespace eval shellthread::worker {
         lappend client_ids $tidclient
         set ts_start_micros $start_m
 
-        set defaults [list -raw 0 -file "" -syslog "" -direction out]
-        set settings [dict merge $defaults $settingsdict]
+        set settings [dict merge $settings_defaults $settingsdict]
 
         set syslog [dict get $settings -syslog]
         if {[string length $syslog]} {
@@ -696,7 +698,8 @@ namespace eval shellthread::manager {
         foreach workertid $subscriberless_workers {
             if {$workertid ni $shuttingdown_workers} {
                 if {$workertid ni $free_threads && $workertid ne "noop"} {
-                    thread::send $workertid {set ::shellthread::worker::settings {}}
+                    #JMN
+                    thread::send $workertid {set ::shellthread::worker::settings $::shellthread::worker::settings_defaults}
                     #todo - log freeing up of thread
                     lappend free_threads $workertid
                 }