From 7e51b2859be5f635590d26d053f24c3c2d0b91df Mon Sep 17 00:00:00 2001
From: Maksim Fomenkov <maksim.fomenkov@p2p.org>
Date: Tue, 29 Nov 2022 14:12:20 +0400
Subject: [PATCH] fix threads loss

---
 .../io/emeraldpay/dshackle/upstream/AbstractHead.kt   | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/AbstractHead.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/AbstractHead.kt
index f93152c0..77318863 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/AbstractHead.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/AbstractHead.kt
@@ -53,11 +53,12 @@ abstract class AbstractHead(
                 val delay = System.currentTimeMillis() - lastHeadUpdated
                 if (delay > awaitHeadTimeoutMs) {
                     log.warn("No head updates for $delay ms @ ${this.javaClass} - restart")
-                    try {
-                        lock.tryLock()
-                        start()
-                    } finally {
-                        lock.unlock()
+                    if (lock.tryLock()) {
+                        try {
+                            start()
+                        } finally {
+                            lock.unlock()
+                        }
                     }
                 }
             }, 300, 30, TimeUnit.SECONDS