framework/src/main/java/org/apache/felix/framework/ServiceRegistry.java [709:755]:
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    void flushUsageCount(Bundle bundle, ServiceReference<?> ref, UsageCount uc)
    {
        // This method uses an optimistic concurrency mechanism with conditional modifications
        // on the m_inUseMap. If this fails (because another thread made changes) this thread
        // retries the operation. This is the purpose of the while loop.
        boolean success = false;
        while (!success)
        {
            UsageCount[] usages = m_inUseMap.get(bundle);
            final UsageCount[] orgUsages = usages;
            for (int i = 0; (usages != null) && (i < usages.length); i++)
            {
                if ((uc == null && usages[i].m_ref.equals(ref)) || (uc == usages[i]))
                {
                    // If this is the only usage, then point to empty list.
                    if ((usages.length - 1) == 0)
                    {
                        usages = null;
                    }
                    // Otherwise, we need to do some array copying.
                    else
                    {
                        UsageCount[] newUsages = new UsageCount[usages.length - 1];
                        System.arraycopy(usages, 0, newUsages, 0, i);
                        if (i < newUsages.length)
                        {
                            System.arraycopy(
                                usages, i + 1, newUsages, i, newUsages.length - i);
                        }
                        usages = newUsages;
                        i--;
                    }
                }
            }

            if (usages == orgUsages)
                return; // no change in map

            if (orgUsages != null)
            {
                if (usages != null)
                    success = m_inUseMap.replace(bundle, orgUsages, usages);
                else
                    success = m_inUseMap.remove(bundle, orgUsages);
            }
        }
    }
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connect/src/main/java/org/apache/felix/connect/felix/framework/ServiceRegistry.java [690:736]:
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    void flushUsageCount(Bundle bundle, ServiceReference<?> ref, UsageCount uc)
    {
        // This method uses an optimistic concurrency mechanism with conditional modifications
        // on the m_inUseMap. If this fails (because another thread made changes) this thread
        // retries the operation. This is the purpose of the while loop.
        boolean success = false;
        while (!success)
        {
            UsageCount[] usages = m_inUseMap.get(bundle);
            final UsageCount[] orgUsages = usages;
            for (int i = 0; (usages != null) && (i < usages.length); i++)
            {
                if ((uc == null && usages[i].m_ref.equals(ref)) || (uc == usages[i]))
                {
                    // If this is the only usage, then point to empty list.
                    if ((usages.length - 1) == 0)
                    {
                        usages = null;
                    }
                    // Otherwise, we need to do some array copying.
                    else
                    {
                        UsageCount[] newUsages = new UsageCount[usages.length - 1];
                        System.arraycopy(usages, 0, newUsages, 0, i);
                        if (i < newUsages.length)
                        {
                            System.arraycopy(
                                usages, i + 1, newUsages, i, newUsages.length - i);
                        }
                        usages = newUsages;
                        i--;
                    }
                }
            }

            if (usages == orgUsages)
                return; // no change in map

            if (orgUsages != null)
            {
                if (usages != null)
                    success = m_inUseMap.replace(bundle, orgUsages, usages);
                else
                    success = m_inUseMap.remove(bundle, orgUsages);
            }
        }
    }
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