From 7d8de55c79834731c5346303e29cb39c30f55d35 Mon Sep 17 00:00:00 2001
From: nodist <kevin.comas.git@gmail.com>
Date: Wed, 17 Jun 2026 13:39:38 -0400
Subject: shared counter example

---
 shared_counter.kpl | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 shared_counter.kpl

(limited to 'shared_counter.kpl')

diff --git a/shared_counter.kpl b/shared_counter.kpl
new file mode 100644
index 0000000..0be8c24
--- /dev/null
+++ b/shared_counter.kpl
@@ -0,0 +1,53 @@
+
+// Notice how counter can only be modified as read as [c]
+
+counter : `shared 0
+
+inc_dec :([amount]
+    header : `const `format "WHITE#Counter:# "
+    body : ^ counter {[c]
+        c +: amount
+        ? {
+            amount = 1 { "#GREEN#%#" `format c }
+            amount = -1 { "#RED#%#" `format c }
+            { "INVALID" }
+        }
+    }
+    `log ,(header; body; "\n")
+)
+
+inc : inc_dec `bind 1
+dec : inc_dec `bind -1
+
+actions : `const 1_000
+
+batch : `const 100
+
+runner : ([fn]
+    total : actions
+    @ total {
+        `log "#BOLD#WHITE#Batch: #CYAN#% #MAGENTA#%#\n" `format (fn; total)
+        v : Vector[`async_type fn] $ ()
+        @ 1 .. batch { v `push `async fn }
+        @ v {[x] `await x }
+        total -: batch
+    }
+)
+
+i : runner `async inc
+d : runner `async dec
+
+`use "time" [Seconds]
+`use "sys" [sleep]
+
+sleep `sync Seconds $ 1
+
+`await (d; i)
+
+`log ^ counter {[c]
+    ? !c {
+        `format "#BOLD#GREEN#VALID#\n"
+    } {
+        `format "#BOLD#RED#INVALID#\n"
+    }
+}
-- 
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