[K/N] Worker API improvements ^KT-52429

Merge-request: KT-MR-6898
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/backend.native/tests/interop/workerSignals/workerSignals.cpp

@@ -0,0 +1,31 @@
+#include "workerSignals.h"
+
+#include <cassert>
+#include <pthread.h>
+#include <signal.h>
+
+namespace {
+
+int pendingValue = 0;
+thread_local int value = 0;
+
+void signalHandler(int signal) {
+    value = pendingValue;
+}
+
+} // namespace
+
+extern "C" void setupSignalHandler(void) {
+    signal(SIGUSR1, &signalHandler);
+}
+
+extern "C" void signalThread(uint64_t thread, int value) {
+    pendingValue = value;
+    auto t = reinterpret_cast<pthread_t>(thread);
+    auto result = pthread_kill(t, SIGUSR1);
+    assert(result == 0);
+}
+
+extern "C" int getValue(void) {
+    return value;
+}

kotlin-native/backend.native/tests/interop/workerSignals/workerSignals.def

@@ -0,0 +1,2 @@
+language = C
+headerFilter = **/workerSignals.h

kotlin-native/backend.native/tests/interop/workerSignals/workerSignals.h

@@ -0,0 +1,13 @@
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void setupSignalHandler(void);
+void signalThread(uint64_t thread, int value);
+int getValue(void);
+
+#ifdef __cplusplus
+}
+#endif

kotlin-native/backend.native/tests/interop/workerSignals/workerSignals.kt

@@ -0,0 +1,27 @@
+@file:OptIn(kotlin.ExperimentalStdlibApi::class)
+
+import kotlin.native.concurrent.*
+import kotlin.test.*
+import workerSignals.*
+
+const val defaultValue = 0
+const val newValue = 42
+
+fun main() {
+    setupSignalHandler()
+
+    withWorker {
+        val before = execute(TransferMode.SAFE, {}) {
+            getValue()
+        }.result
+        assertEquals(defaultValue, getValue())
+        assertEquals(defaultValue, before)
+
+        signalThread(platformThreadId, newValue)
+        val after = execute(TransferMode.SAFE, {}) {
+            getValue()
+        }.result
+        assertEquals(defaultValue, getValue())
+        assertEquals(newValue, after)
+    }
+}