[Java 21] Fix profiler test

bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/api/Environment.java

@@ -21,6 +21,7 @@
 import io.ballerina.runtime.api.types.Parameter;
 
 import java.util.Optional;
+import java.util.function.Supplier;
 
 /**
  * When this class is used as the first argument of an interop method, Ballerina will inject an instance of
@@ -47,9 +48,9 @@ public abstract class Environment {
     /**
      * Yield the current execution and run some operation so other non isolated functions can run in asynchronously.
      *
-     * @param runnable operation to be executed.
+     * @param supplier operation to be executed.
      */
-    public abstract void yieldAndRun(Runnable runnable);
+    public abstract Object yieldAndRun(Supplier<Object> supplier);
 
     /**
      * Gets an instance of Ballerina runtime.

bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/internal/BalEnvironment.java

@@ -26,6 +26,7 @@
 import io.ballerina.runtime.internal.scheduling.Strand;
 
 import java.util.Optional;
+import java.util.function.Supplier;
 
 /**
  * When {@link Environment} is used as the first argument of an interop method, Ballerina will inject an instance
@@ -69,10 +70,10 @@ public Parameter[] getFunctionPathParameters() {
     }
 
     @Override
-    public void yieldAndRun(Runnable runnable) {
+    public Object yieldAndRun(Supplier<Object> supplier) {
         try {
             strand.yield();
-            runnable.run();
+            return supplier.get();
         } finally {
             strand.resume();
         }

bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/internal/lock/BLockStore.java

@@ -51,10 +51,8 @@ public BLockStore() {
     */
     @SuppressWarnings("unused")
     public void lock(Strand strand, String lockName) {
-        strand.yield();
         getLockFromMap(lockName).lock();
         strand.acquiredLockCount++;
-        strand.resume();
     }
 
     /*

bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/internal/scheduling/AsyncUtils.java

@@ -40,10 +40,10 @@
 public class AsyncUtils {
 
     public static Object handleNonIsolatedStrand(Strand strand, Supplier<?> resultSupplier) {
+        // This check required for non strand Threads.
         boolean runnable = strand.isRunnable();
         if (runnable) {
             strand.yield();
-
         }
         Object result = resultSupplier.get();
         if (runnable) {

bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/internal/scheduling/Scheduler.java

@@ -72,7 +72,10 @@ public static Strand getStrand() {
         if (strand != null) {
             return strand;
         }
-        return daemonStrand;
+        if (daemonStrand == null) {
+            return null;
+        }
+        return new Strand(null, null, daemonStrand.scheduler, daemonStrand, false, null, null);
     }
     public Object call(Module module, String functionName, Strand parentStrand, Object... args) {
         boolean runnable = parentStrand.isRunnable();

bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/internal/scheduling/Strand.java

@@ -91,7 +91,6 @@ public void resume() {
         checkStrandCancelled();
         if (!this.isIsolated && !scheduler.globalNonIsolatedLock.isHeldByCurrentThread()) {
             this.scheduler.globalNonIsolatedLock.lock();
-
         }
     }
 
@@ -103,7 +102,7 @@ public void yield() {
     }
 
     public void done() {
-        if (!isIsolated && scheduler.globalNonIsolatedLock.isHeldByCurrentThread()) {
+        if (!this.isIsolated && scheduler.globalNonIsolatedLock.isHeldByCurrentThread()) {
             scheduler.globalNonIsolatedLock.unlock();
         }
     }

langlib/lang.runtime/src/main/java/org/ballerinalang/langlib/runtime/Sleep.java

@@ -49,6 +49,7 @@ public static void sleep(Environment env, BDecimal delaySeconds) {
         env.yieldAndRun(() -> {
             try {
                 Thread.sleep(delay);
+                return null;
             } catch (InterruptedException e) {
                 throw ErrorCreator.createError(StringUtils.fromString("error occurred during sleep"), e);
             }

tests/jballerina-integration-test/src/test/java/org/ballerinalang/test/profiler/ProfilerTest.java

@@ -137,8 +137,11 @@ public void testProfilerExecutionWithKillSignal() throws BallerinaTestException
             bMainInstance.waitForLeechers(List.of(beforeExecleechers), 20000);
             addLogLeechers(afterExecleechers, serverInfoLogReader);
             Thread.sleep(5000);
-            long processId = process.pid();
-            Runtime.getRuntime().exec("kill -SIGINT " + processId);
+            ProcessHandle profilerHandle = process.children().findFirst().get().children().findFirst().get();
+            long profileId = profilerHandle.pid();
+            long balProcessID = profilerHandle.children().findFirst().get().pid();
+            Runtime.getRuntime().exec("kill -SIGINT " + balProcessID);
+            Runtime.getRuntime().exec("kill -SIGINT " + profileId);
             bMainInstance.waitForLeechers(List.of(afterExecleechers), 20000);
             process.waitFor();
         } catch (InterruptedException | IOException e) {

tests/jballerina-unit-test/src/test/java/org/ballerinalang/test/utils/interop/Utils.java

@@ -35,6 +35,7 @@ public static void sleep(Environment env, long delayMillis) {
         env.yieldAndRun(() -> {
             try {
                 Thread.sleep(delayMillis);
+                return null;
             } catch (InterruptedException e) {
                 throw ErrorCreator.createError(e);
             }