diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt b/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt
new file mode 100644
index 0000000..606a4b6
--- /dev/null
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt
@@ -0,0 +1,29 @@
+@file:OptIn(ExperimentalContracts::class)
+
+package ru.landgrafhomyak.utility.closeable_state_1
+
+import kotlin.contracts.ExperimentalContracts
+
+public expect open class UsagesCounter : CloseableState.AllowsConcurrency {
+	public constructor()
+
+	protected open fun throwClosed(): Nothing
+
+	protected open fun throwInUse(): Nothing
+
+
+	public final override val isClosed: Boolean
+
+	public final override fun assertNotClosed()
+
+	@ManualStateManipulation
+	public final override fun startUsage()
+
+	@ManualStateManipulation
+	public final override fun finishUsage()
+
+	@ManualStateManipulation
+	public final override fun close()
+
+	public open override fun toString(): String
+}
\ No newline at end of file
diff --git a/src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/jErrorOnConcurrentAccessState.java b/src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/jErrorOnConcurrentAccessState.java
new file mode 100644
index 0000000..0f82a72
--- /dev/null
+++ b/src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/jErrorOnConcurrentAccessState.java
@@ -0,0 +1,67 @@
+package ru.landgrafhomyak.utility.closeable_state_1;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+public class jErrorOnConcurrentAccessState
+		extends jErrorOnConcurrentAccessState$Errors
+		implements CloseableState.ExternallySynchronized {
+	private enum State {
+		OPEN, IN_USE, CLOSED
+	}
+
+	private final AtomicReference<State> _currentState;
+
+	public jErrorOnConcurrentAccessState() {
+		this._currentState = new AtomicReference<>();
+	}
+
+	@Override
+	public boolean isInUse() {
+		return this._currentState.get() == State.IN_USE;
+	}
+
+	@Override
+	public boolean isClosed() {
+		return this._currentState.get() == State.CLOSED;
+	}
+
+	@Override
+	public void assertNotClosed() {
+		if (this.isClosed())
+			this.throwClosed();
+	}
+
+	@Override
+	public void startUsage() {
+		switch (this._currentState.compareAndExchange(State.OPEN, State.IN_USE)) {
+			case IN_USE:
+				this.throwConcurrent();
+			case CLOSED:
+				this.throwClosed();
+			case OPEN:
+				break;
+		}
+	}
+
+	@Override
+	public void finishUsage() {
+		switch (this._currentState.compareAndExchange(State.IN_USE, State.OPEN)) {
+			case OPEN:
+				throw new IllegalStateException("Can't finish usage because not it not started");
+			case CLOSED:
+				this.throwClosed();
+			case IN_USE:
+		}
+	}
+
+	@Override
+	public void close() {
+		switch (this._currentState.compareAndExchange(State.OPEN, State.CLOSED)) {
+			case CLOSED:
+				this.throwClosed();
+			case IN_USE:
+				this.throwInUse();
+			case OPEN:
+		}
+	}
+}
diff --git a/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/actuals.kt b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/actuals.kt
new file mode 100644
index 0000000..596ff93
--- /dev/null
+++ b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/actuals.kt
@@ -0,0 +1,3 @@
+package ru.landgrafhomyak.utility.closeable_state_1
+
+public actual typealias UsagesCounter = jUsagesCounter
\ No newline at end of file
diff --git a/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jErrorOnConcurrentAccessState$Errors.kt b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jErrorOnConcurrentAccessState$Errors.kt
new file mode 100644
index 0000000..8b74f91
--- /dev/null
+++ b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jErrorOnConcurrentAccessState$Errors.kt
@@ -0,0 +1,15 @@
+package ru.landgrafhomyak.utility.closeable_state_1
+
+internal abstract class `jErrorOnConcurrentAccessState$Errors` : CloseableState.ExternallySynchronized {
+	protected open fun throwClosed(): Nothing {
+		throw IllegalStateException("Object is closed")
+	}
+
+	protected open fun throwInUse(): Nothing {
+		throw IllegalStateException("Failed close object because it is in use")
+	}
+
+	protected open fun throwConcurrent(): Nothing {
+		throw IllegalStateException("Object is in use by another thread")
+	}
+}
\ No newline at end of file
diff --git a/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt
index cb1bc9c..1e3536e 100644
--- a/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt
+++ b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt
@@ -1,7 +1,5 @@
 package ru.landgrafhomyak.utility.closeable_state_1
 
-import kotlin.IllegalStateException
-
 internal abstract class `jUsagesCounter$Errors` {
 	protected open fun throwClosed(): Nothing {
 		throw IllegalStateException("Object is closed")
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/ErrorOnConcurrentAccessState.kt b/src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/ErrorOnConcurrentAccessState.kt
similarity index 98%
rename from src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/ErrorOnConcurrentAccessState.kt
rename to src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/ErrorOnConcurrentAccessState.kt
index 3ecd9ff..257890c 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/ErrorOnConcurrentAccessState.kt
+++ b/src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/ErrorOnConcurrentAccessState.kt
@@ -57,7 +57,7 @@ public open class ErrorOnConcurrentAccessState : CloseableState.ExternallySynchr
 	public final override fun close() {
 		when (this._state.compareAndExchange(State.OPEN, State.CLOSED)) {
 			State.OPEN -> {}
-			State.IN_USE -> this.throwConcurrent()
+			State.IN_USE -> this.throwInUse()
 			State.CLOSED -> this.throwClosed()
 		}
 	}
diff --git a/src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt b/src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt
index 83534ed..cdd5861 100644
--- a/src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt
+++ b/src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt
@@ -10,30 +10,30 @@ import ru.landgrafhomyak.utility.closeable_state_1.internal.get
 import ru.landgrafhomyak.utility.closeable_state_1.internal.newAtomicLong
 import ru.landgrafhomyak.utility.closeable_state_1.internal.update
 
-public open class UsagesCounter : CloseableState.AllowsConcurrency {
+public actual open class UsagesCounter : CloseableState.AllowsConcurrency {
 	private val _value: AtomicLong = newAtomicLong(0L)
 
-	public constructor()
+	public actual constructor()
 
 	public fun getCurrentUsagesCount(): Long = this._value.get()
 
-	protected open fun throwClosed(): Nothing {
+	protected actual open fun throwClosed(): Nothing {
 		throw IllegalStateException("Object is closed")
 	}
 
-	protected open fun throwInUse(): Nothing {
+	protected actual open fun throwInUse(): Nothing {
 		throw IllegalStateException("Failed close object because it is in use")
 	}
 
 
-	public final override val isClosed: Boolean get() = this._value.get() < 0
+	public actual final override val isClosed: Boolean get() = this._value.get() < 0
 
-	public final override fun assertNotClosed() {
+	public actual final override fun assertNotClosed() {
 		if (this._value.get() < 0) this.throwClosed()
 	}
 
 	@ManualStateManipulation
-	public final override fun startUsage() {
+	public actual final override fun startUsage() {
 		this._value.update { o ->
 			if (o < 0) this.throwClosed()
 			return@update o + 1
@@ -41,12 +41,12 @@ public open class UsagesCounter : CloseableState.AllowsConcurrency {
 	}
 
 	@ManualStateManipulation
-	public final override fun finishUsage() {
+	public actual final override fun finishUsage() {
 		this._value.update(Long::dec)
 	}
 
 	@ManualStateManipulation
-	public final override fun close() {
+	public actual final override fun close() {
 		val state = this._value.compareAndExchange(0, Misc.CLOSED_STATE_VALUE)
 		when {
 			state > 0 -> this.throwInUse()
@@ -54,7 +54,7 @@ public open class UsagesCounter : CloseableState.AllowsConcurrency {
 		}
 	}
 
-	public open override fun toString(): String {
+	public actual open override fun toString(): String {
 		val cached = this._value.get()
 		@Suppress("LiftReturnOrAssignment")
 		if (cached < 0)