assertNotNull(sendRegion.getBuffer(), "Send region buffer should not be null");

            RdmaMemoryRegion recvRegion = bufferManager.getReceiveRegion();
            assertNotNull(recvRegion, "Receive region should not be null");
            assertTrue(recvRegion.getSize() > 0, "Receive region should have positive size");

            availableSendRegions.offer(region);
        } else {
            region.close();
            totalReleased.incrementAndGet();
        }
    }
    
    public RdmaMemoryRegion getReceiveRegion() throws IOException {
        RdmaMemoryRegion region = availableReceiveRegions.poll();
        if (region != null) {
            region.getBuffer().clear();
            return region;
        }