From de7c53567abf8dcacf38de4d79ded3f5c143f0ba Mon Sep 17 00:00:00 2001
From: Robinson <robinson@dorkbox.com>
Date: Fri, 19 Aug 2022 23:30:08 +0200
Subject: [PATCH] Inline reentrant, added comments

---
 src/dorkbox/util/CommonUtils.kt | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/dorkbox/util/CommonUtils.kt b/src/dorkbox/util/CommonUtils.kt
index 1b41241..5f9a185 100644
--- a/src/dorkbox/util/CommonUtils.kt
+++ b/src/dorkbox/util/CommonUtils.kt
@@ -74,7 +74,9 @@ fun asyncIO(action: suspend CoroutineScope.() -> Unit): Job {
     }
 }
 
-suspend fun <T> Mutex.withReentrantLock(block: suspend () -> T): T {
+
+// From: https://elizarov.medium.com/phantom-of-the-coroutine-afc63b03a131
+suspend inline fun <T> Mutex.withReentrantLock(crossinline block: suspend () -> T): T {
     val key = ReentrantMutexContextKey(this)
 
     // call block directly when this mutex is already locked in the context
@@ -82,7 +84,9 @@ suspend fun <T> Mutex.withReentrantLock(block: suspend () -> T): T {
 
     // otherwise add it to the context and lock the mutex
     return withContext(ReentrantMutexContextElement(key)) {
-        withLock { block() }
+        withLock {
+            return@withContext block()
+        }
     }
 }