framework/src/main/java/org/apache/felix/framework/ServiceRegistry.java [148:190]:
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    public void unregisterService(
            final Bundle bundle,
            final ServiceRegistration<?> reg)
    {
        // If this is a hook, it should be removed.
        this.hookRegistry.removeHooks(reg.getReference());

        // Now remove the registered service.
        final List<ServiceRegistration<?>> regs = m_regsMap.get(bundle);
        if (regs != null)
        {
            // this is a per bundle list, therefore synchronizing this should be fine
            synchronized ( regs )
            {
                regs.remove(reg);
            }
        }
        m_regCapSet.removeCapability((BundleCapabilityImpl) reg.getReference());

        // Notify callback objects about unregistering service.
        if (m_callbacks != null)
        {
            m_callbacks.serviceChanged(
                new ServiceEvent(ServiceEvent.UNREGISTERING, reg.getReference()), null);
        }

        // Now forcibly unget the service object for all stubborn clients.
        final ServiceReference<?> ref = reg.getReference();
        ungetServices(ref);

        // Invalidate registration
        ((ServiceRegistrationImpl) reg).invalidate();

        // Bundles are allowed to get a reference while unregistering
        // get fresh set of bundles (should be empty, but this is a sanity check)
        ungetServices(ref);

        // Now flush all usage counts as the registration is invalid
        for (Bundle usingBundle : m_inUseMap.keySet())
        {
            flushUsageCount(usingBundle, ref, null);
        }
    }
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connect/src/main/java/org/apache/felix/connect/felix/framework/ServiceRegistry.java [145:187]:
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    public void unregisterService(
            final Bundle bundle,
            final ServiceRegistration<?> reg)
    {
        // If this is a hook, it should be removed.
        this.hookRegistry.removeHooks(reg.getReference());

        // Now remove the registered service.
        final List<ServiceRegistration<?>> regs = m_regsMap.get(bundle);
        if (regs != null)
        {
            // this is a per bundle list, therefore synchronizing this should be fine
            synchronized ( regs )
            {
                regs.remove(reg);
            }
        }
        m_regCapSet.removeCapability((BundleCapabilityImpl) reg.getReference());

        // Notify callback objects about unregistering service.
        if (m_callbacks != null)
        {
            m_callbacks.serviceChanged(
                new ServiceEvent(ServiceEvent.UNREGISTERING, reg.getReference()), null);
        }

        // Now forcibly unget the service object for all stubborn clients.
        final ServiceReference<?> ref = reg.getReference();
        ungetServices(ref);

        // Invalidate registration
        ((ServiceRegistrationImpl) reg).invalidate();

        // Bundles are allowed to get a reference while unregistering
        // get fresh set of bundles (should be empty, but this is a sanity check)
        ungetServices(ref);

        // Now flush all usage counts as the registration is invalid
        for (Bundle usingBundle : m_inUseMap.keySet())
        {
            flushUsageCount(usingBundle, ref, null);
        }
    }
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