From c686011e93531988ad4fa2bc23f621a33edba4fd Mon Sep 17 00:00:00 2001
From: Brendan Hansen <brendan.f.hansen@gmail.com>
Date: Thu, 2 Sep 2021 10:11:56 -0500
Subject: [PATCH] using 'Atomics.wait' because that does what I want it to

---
 static/src/index.js  | 23 +++++------------------
 static/src/worker.js | 14 ++++++++------
 2 files changed, 13 insertions(+), 24 deletions(-)

diff --git a/static/src/index.js b/static/src/index.js
index f5a85e7..edb6c0a 100644
--- a/static/src/index.js
+++ b/static/src/index.js
@@ -43,20 +43,6 @@ async function run_wasm(wasm_bytes) {
                 update_running_msg();
                 break;
             }
-
-            case 'input': {
-                let input_array = new Uint8Array(input_shared_buffer);
-                Atomics.store(input_array, 0, 0);
-                let msg = prompt("Line: ");
-                input_array.fill(0);
-
-                for (let i=0; i<msg.length && i<input_array.length - 1; i++) {
-                    input_array[i + 1] = msg.charCodeAt(i);
-                }
-
-                Atomics.store(input_array, 0, 1);
-                break;
-            }
         }
     };
 
@@ -219,15 +205,16 @@ function submit_input() {
 
     write_output(input + "\n", false);
 
-    let input_array = new Uint8Array(input_shared_buffer);
-    Atomics.store(input_array, 0, 0);
+    let input_array = new Uint8Array(input_shared_buffer, 4);
     input_array.fill(0);
 
     for (let i=0; i<input.length && i<input_array.length - 1; i++) {
-        input_array[i + 1] = input.charCodeAt(i);
+        input_array[i] = input.charCodeAt(i);
     }
 
-    Atomics.store(input_array, 0, 1);
+    let atomic_array = new Int32Array(input_shared_buffer);
+    Atomics.store(atomic_array, 0, 1);
+    Atomics.notify(atomic_array, 0);
     inputbar.value = "";
 }
 
diff --git a/static/src/worker.js b/static/src/worker.js
index e9b3da6..686d20c 100644
--- a/static/src/worker.js
+++ b/static/src/worker.js
@@ -13,9 +13,10 @@ let import_obj = {
             return Date.now();
         },
 
-        read_line_available: async function() {
-            let input_array = new Uint8Array(input_shared_buffer);
-            while (Atomics.load(input_array, 0) == 0);
+        read_line_available: function() {
+            let input_array = new Int32Array(input_shared_buffer);
+            Atomics.store(input_array, 0, 0);
+            Atomics.wait(input_array, 0, 0);
         },
 
         read_line(msgptr, msglen) { // Returns actual length
@@ -23,11 +24,12 @@ let import_obj = {
             let input_array = new Uint8Array(input_shared_buffer);
 
             let i;
-            for (i=0; input_array[i + 1] != 0 && i<msglen; i++) {
-                data[i] = input_array[i + 1];
+            for (i=0; input_array[i + 4] != 0 && i<msglen; i++) {
+                data[i] = input_array[i + 4];
             }
 
-            Atomics.store(input_array, 0, 0);
+            let atomic_stuff = new Int32Array(input_shared_buffer);
+            Atomics.store(atomic_stuff, 0, 0);
 
             return i;
         },
-- 
2.25.1