From a6ab10a182d00fa11a958b7ba22a319822973444 Mon Sep 17 00:00:00 2001
From: apnadkarni <apnmbx-wits@yahoo.com>
Date: Fri, 24 May 2024 16:22:18 +0000
Subject: Tests for bug fixes

---
 tests/io.test | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 73 insertions(+), 6 deletions(-)

diff --git a/tests/io.test b/tests/io.test
index 49c16b7..a41e56b 100644
--- a/tests/io.test
+++ b/tests/io.test
@@ -6253,21 +6253,27 @@ test io-44.5 {FileEventProc procedure: end of file} -constraints {
 
 close $f
 
+# Bug https://core.tcl-lang.org/tcl/info/de232b49f26da1c1 with a corrected
+# refchan implementation. refchans should be responsible for their own
+# event generation and the one in the bug report was not doing so.
 test io-44.6 {FileEventProc procedure: write-only non-blocking channel} -setup {
-} -constraints {stdio fileevent openpipe} -body {
+} -constraints {stdio fileevent} -body {
 
     namespace eval refchan {
 	namespace ensemble create
 	namespace export *
-
+        # Change to taste depending on how much CPU you want to hog
+        variable delay 0
 
 	proc finalize {chan args} {
+            namespace upvar c_$chan timer timer
+            catch {after cancel $timer}
 	    namespace delete c_$chan
 	}
 
 	proc initialize {chan args} {
 	    namespace eval c_$chan {}
-	    namespace upvar c_$chan watching watching
+	    namespace upvar c_$chan watching watching timer timer
 	    set watching {}
 	    list finalize initialize seek watch write
 	}
@@ -6281,17 +6287,37 @@ test io-44.6 {FileEventProc procedure: write-only non-blocking channel} -setup {
 			if {$arg ni $watching} {
 			    lappend watching $arg
 			}
-			chan postevent $chan $arg
 		    }
 		}
 	    }
+            update $chan
 	}
 
-
 	proc write {chan args} {
-	    chan postevent $chan write
 	    return 1
 	}
+
+        # paraphrased from tcllib
+        proc update {chan} {
+            namespace upvar c_$chan watching watching timer timer
+            variable delay
+            catch {after cancel $timer}
+            if {"write" in $watching} {
+                set timer [after idle after $delay \
+                               [namespace code [list post $chan]]]
+            }
+        }
+
+        # paraphrased from tcllib
+        proc post {chan} {
+            variable delay
+            namespace upvar c_$chan watching watching timer timer
+            if {"write" in $watching} {
+                set timer [after idle after $delay \
+                               [namespace code [list post $chan]]]
+                chan postevent $chan write
+            }
+        }
     }
     set f [chan create w [namespace which refchan]]
     chan configure $f -blocking 0
@@ -6315,6 +6341,47 @@ test io-44.6 {FileEventProc procedure: write-only non-blocking channel} -setup {
     catch {chan close $f}
 } -result done
 
+# Bug https://core.tcl-lang.org/tcl/info/67a5eabbd3d1 with a corrected
+# refchan implementation. refchans that are not reentrant should use
+# event loop to post events and the script in the bug report was not
+# doing so.
+test io-44.7 {refchan + coroutine yield error } -setup {
+    set bghandler [interp bgerror {}]
+    namespace eval schan {
+        namespace ensemble create
+        namespace export *
+        proc open {} {
+            set chan [chan create read [namespace current]]
+
+        }
+        proc initialize {chan mode} {
+            return [list initialize finalize read watch]
+        }
+
+        proc read {chan count} {
+        }
+
+        proc watch {chan eventspec} {
+            after idle after 0 chan postevent $chan $eventspec
+        }
+    }
+} -cleanup {
+    interp bgerror {} $bghandler
+    unset -nocomplain ::io-44.7-result
+    namespace delete schan
+} -body {
+    interp bgerror {} [list apply {{res opts} {
+        set ::io-44.7-result [dict get $opts -errorinfo]
+    }}]
+    coroutine c1 apply [list {} {
+        set chan [schan::open]
+        chan event $chan readable [list [info coroutine]]
+        yield
+        set ::io-44.7-result success
+    } [namespace current]]
+    vwait ::io-44.7-result
+    set ::io-44.7-result
+} -result success
 
 makeFile "foo bar" foo
 
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