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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package com.oracle.truffle.runtime.hotspot;

import com.oracle.truffle.api.CompilerDirectives;

final class HotSpotVirtualThreadHooks {

    static {
        // We pass both classes here to ensure they are loaded before the hooks are called
        registerJVMTIHook(HotSpotThreadLocalHandshake.class, HotSpotFastThreadLocal.class);
    }

    private static native void registerJVMTIHook(Class hotSpotThreadLocalHandshakeClass, Class hotSpotFastThreadLocalClass);

    static void ensureLoaded() {
    }

    /** Called from a JVMTI VirtualThreadUnmount hook. */
    @SuppressWarnings("unused")
    private static void unmountHook(Thread currentThread) {
        if (Thread.currentThread() != currentThread) {
            throw CompilerDirectives.shouldNotReachHere("Thread.currentThread() not matching");
        }
        HotSpotFastThreadLocal.unmount();
    }

    /** Called from a JVMTI VirtualThreadMount hook. */
    @SuppressWarnings("unused")
    private static void mountHook(Thread currentThread) {
        if (Thread.currentThread() != currentThread) {
            throw CompilerDirectives.shouldNotReachHere("Thread.currentThread() not matching");
        }
        HotSpotFastThreadLocal.mount();
        HotSpotThreadLocalHandshake.setPendingFlagForVirtualThread();
    }

}