diff --git a/build.gradle.kts b/build.gradle.kts
index 279b194..1524c94 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -40,7 +40,11 @@ kotlin {
 
 
 	configureAllCompilersOptionsOnAllTargets {
-		freeCompilerArgs.addAll("-Xexpect-actual-classes", "-Xrender-internal-diagnostic-names", "-XXLanguage:+ExpectRefinement")
+		freeCompilerArgs.addAll(
+			"-Xexpect-actual-classes",
+			"-Xrender-internal-diagnostic-names", "-Xdont-warn-on-error-suppression",
+			"-XXLanguage:+ExpectRefinement", /*"-Xreport-output-files"*/
+		)
 	}
 
 	jvm().compilations.configureEach {
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt b/src/commonMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
index 5e99024..4542504 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
@@ -3,7 +3,6 @@ package ru.landgrafhomyak.multitasking_0.threads
 import ru.landgrafhomyak.multitasking_0.fibers.Fiber
 import ru.landgrafhomyak.multitasking_0.SingleThreadEventLoop
 import ru.landgrafhomyak.multitasking_0.WrongCallerThreadException
-import ru.landgrafhomyak.multitasking_0.threads.sync.ResumeThreadCallback
 
 public expect sealed interface ThreadLocalMethods {
 	/**
@@ -39,36 +38,4 @@ public expect sealed interface ThreadLocalMethods {
 
 	public val runningEventLoop: SingleThreadEventLoop?
 	public fun setEventLoop(eventLoop: SingleThreadEventLoop): ClearEventLoopCallback
-
-	/**
-	 * Hints platform scheduler to switch to another thread. Doesn't guarantee switching.
-	 */
-	public fun yield()
-
-	/**
-	 * Removes thread from system scheduler until [resumeThread()][ResumeThreadCallback.resumeThread].
-	 * If system allows unauthorized thread resuming, blocks these attempts.
-	 *
-	 * It's a high-level mechanism to implement custom synchronization methods, it isn't faster than existing native synchronization primitives.
-	 *
-	 * @param store callback to obtain and store [ResumeThreadCallback] reference.
-	 * If [resumeThread()][ResumeThreadCallback.resumeThread] called inside - immediately returns.
-	 */
-	public fun suspendThread(store: (ResumeThreadCallback) -> Unit)
-
-	/**
-	 * Removes thread from system scheduler until [resumeThread()][ResumeThreadCallback.resumeThread] or until timeout expires.
-	 * If system allows unauthorized thread resuming, blocks these attempts.
-	 *
-	 * When timeout expires, [resumeThread()][ResumeThreadCallback.resumeThread] becomes unavailable
-	 * (wrap it with explicit synchronization) and [timeoutHandler] called in thread that was suspended before this function returns.
-	 *
-	 * It's a high-level mechanism to implement custom synchronization methods, it isn't faster than existing native synchronization primitives.
-	 *
-	 * @param timeoutMillis timeout in milliseconds. If equals to `0`, [store] and [timeoutHandler] will be called anyway.
-	 * @param timeoutHandler callback called by resumed thread after timeout expired.
-	 * @param store callback to obtain and store [ResumeThreadCallback] reference.
-	 * If [resumeThread()][ResumeThreadCallback.resumeThread] called inside - immediately returns.
-	 */
-	public fun suspendThread(timeoutMillis: UInt, timeoutHandler: ResumeThreadCallback.TimeoutHandler, store: (ResumeThreadCallback) -> Unit)
 }
\ No newline at end of file
diff --git a/src/jvmMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt b/src/jvmMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
index f4aaa2e..7e26c03 100644
--- a/src/jvmMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
+++ b/src/jvmMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
@@ -4,6 +4,7 @@ import ru.landgrafhomyak.multitasking_0.fibers.Fiber
 import ru.landgrafhomyak.multitasking_0.SingleThreadEventLoop
 import ru.landgrafhomyak.multitasking_0.threads.sync.ResumeThreadCallback
 
+@Suppress("AMBIGUOUS_EXPECTS", "ACTUAL_WITHOUT_EXPECT")
 public actual sealed interface ThreadLocalMethods {
 	public actual fun get(): Thread
 
diff --git a/src/multithreadPlatformMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt b/src/multithreadPlatformMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
new file mode 100644
index 0000000..81db42f
--- /dev/null
+++ b/src/multithreadPlatformMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/ThreadLocalMethods.kt
@@ -0,0 +1,77 @@
+package ru.landgrafhomyak.multitasking_0.threads
+
+import kotlin.experimental.ExpectRefinement
+import ru.landgrafhomyak.multitasking_0.fibers.Fiber
+import ru.landgrafhomyak.multitasking_0.SingleThreadEventLoop
+import ru.landgrafhomyak.multitasking_0.WrongCallerThreadException
+import ru.landgrafhomyak.multitasking_0.threads.sync.ResumeThreadCallback
+
+@OptIn(ExperimentalMultiplatform::class)
+@ExpectRefinement
+public expect sealed interface ThreadLocalMethods {
+	/**
+	 * Returns descriptor of current thread.
+	 *
+	 * @throws WrongCallerThreadException if called on thread different that caller of [Thread.current].
+	 */
+	public fun get(): Thread
+
+	/**
+	 * Returns descriptor of [fiber][Fiber] that is currently [running (or emulates running)][Fiber.resume]
+	 * in this thread.
+	 *
+	 * If set, condition `Thread.current.runningFiber.resumedOnThread === Thread.current.get()` always true
+	 *
+	 * [Fiber][Fiber] implementations must control this property explicitly with [enterFiber()][ThreadLocalMethods.enterFiber]
+	 * and [exitFiber()][ExitFiberCallback.exitFiber]
+	 *
+	 * @throws WrongCallerThreadException if called on thread different that caller of [Thread.current].
+	 */
+	public val runningFiber: Fiber?
+
+	/**
+	 * Informs thread that execution flow was switched to [fiber][Fiber].
+	 *
+	 * @param fiberToEnter descriptor of fiber that is [going to run][Fiber.resume].
+	 * @return Callback object to rollback value of [Thread.current.runningFiber][ThreadLocalMethods.runningFiber]
+	 * to state before this call.
+	 *
+	 * @throws WrongCallerThreadException if called on thread different that caller of [Thread.current].
+	 */
+	public fun enterFiber(fiberToEnter: Fiber): ExitFiberCallback
+
+	public val runningEventLoop: SingleThreadEventLoop?
+	public fun setEventLoop(eventLoop: SingleThreadEventLoop): ClearEventLoopCallback
+
+	/**
+	 * Hints platform scheduler to switch to another thread. Doesn't guarantee switching.
+	 */
+	public fun yield()
+
+	/**
+	 * Removes thread from system scheduler until [resumeThread()][ResumeThreadCallback.resumeThread].
+	 * If system allows unauthorized thread resuming, blocks these attempts.
+	 *
+	 * It's a high-level mechanism to implement custom synchronization methods, it isn't faster than existing native synchronization primitives.
+	 *
+	 * @param store callback to obtain and store [ResumeThreadCallback] reference.
+	 * If [resumeThread()][ResumeThreadCallback.resumeThread] called inside - immediately returns.
+	 */
+	public fun suspendThread(store: (ResumeThreadCallback) -> Unit)
+
+	/**
+	 * Removes thread from system scheduler until [resumeThread()][ResumeThreadCallback.resumeThread] or until timeout expires.
+	 * If system allows unauthorized thread resuming, blocks these attempts.
+	 *
+	 * When timeout expires, [resumeThread()][ResumeThreadCallback.resumeThread] becomes unavailable
+	 * (wrap it with explicit synchronization) and [timeoutHandler] called in thread that was suspended before this function returns.
+	 *
+	 * It's a high-level mechanism to implement custom synchronization methods, it isn't faster than existing native synchronization primitives.
+	 *
+	 * @param timeoutMillis timeout in milliseconds. If equals to `0`, [store] and [timeoutHandler] will be called anyway.
+	 * @param timeoutHandler callback called by resumed thread after timeout expired.
+	 * @param store callback to obtain and store [ResumeThreadCallback] reference.
+	 * If [resumeThread()][ResumeThreadCallback.resumeThread] called inside - immediately returns.
+	 */
+	public fun suspendThread(timeoutMillis: UInt, timeoutHandler: ResumeThreadCallback.TimeoutHandler, store: (ResumeThreadCallback) -> Unit)
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/sync/ResumeThreadCallback.kt b/src/multithreadPlatformMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/sync/ResumeThreadCallback.kt
similarity index 100%
rename from src/commonMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/sync/ResumeThreadCallback.kt
rename to src/multithreadPlatformMain/kotlin/ru/landgrafhomyak/multitasking_0/threads/sync/ResumeThreadCallback.kt