From 0715feffa14fc5a0bf8e376c1ee0864214e1c957 Mon Sep 17 00:00:00 2001
From: Vitaliy Filippov <vitalif@yourcmc.ru>
Date: Wed, 4 Feb 2026 02:33:08 +0300
Subject: [PATCH] Wait for finished read, not for process exit in lp_optimizer

---
 mon/lp_optimizer/lp_optimizer.js | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/mon/lp_optimizer/lp_optimizer.js b/mon/lp_optimizer/lp_optimizer.js
index dbb0cf30..ab8fbc92 100644
--- a/mon/lp_optimizer/lp_optimizer.js
+++ b/mon/lp_optimizer/lp_optimizer.js
@@ -10,16 +10,19 @@ const NO_OSD = 'Z';
 async function lp_solve(text)
 {
     const cp = child_process.spawn('lp_solve');
-    let stdout = '', stderr = '', finish_cb;
+    let stdout = '', stderr = '', finish_cb, finished = 0;
     cp.stdout.on('data', buf => stdout += buf.toString());
     cp.stderr.on('data', buf => stderr += buf.toString());
-    cp.on('exit', () => finish_cb && finish_cb());
+    cp.stdout.on('end', () => finish_cb());
+    cp.stderr.on('end', () => finish_cb());
     cp.stdin.write(text);
     cp.stdin.end();
-    if (cp.exitCode == null)
+    await new Promise(ok => (finish_cb = () =>
     {
-        await new Promise(ok => finish_cb = ok);
-    }
+        finished++;
+        if (finished == 2)
+            ok();
+    }));
     if (!stdout.trim())
     {
         return null;