this.current = current;
    }

    /**
     * Allocate an available port
     *
     * @return the port that was allocated
     */
    int allocate() {
        try {
            lock.lock();
            return getAvailablePort();
        } finally {
            lock.unlock();
        }
    }

    /**
     * Deallocate the given port
     *
     * @param port The port to deallocate
     */

// until any memory allocated from it is no longer needed.
//
// An Arena must never be used concurrently by multiple goroutines.
type Arena struct {
	a unsafe.Pointer
}

// NewArena allocates a new arena.
func NewArena() *Arena {
	return &Arena{a: runtime_arena_newArena()}
}

// Free frees the arena (and all objects allocated from the arena) so that

        assertSame(c, second, "Second get should return second cached buffer");
        assertNotSame(d, third, "Third get should allocate a new buffer (not the dropped one)");
        assertEquals(3, third.length, "Allocated buffer length matches configured maximum size");
    }

    // Parameterized: exercise small variations of cache size for a simple reuse cycle
    @ParameterizedTest

        this.totalAllocated = new AtomicLong();
        this.totalReleased = new AtomicLong();

        // Pre-allocate buffer pool
        initializeBufferPool();
    }

    /**
     * Initialize the buffer pool with pre-allocated regions
     */
    private void initializeBufferPool() {
        // Allocate send buffers
        for (int i = 0; i < initialSendBuffers; i++) {
            try {

pkg syscall (linux-386), func EpollWait(int, []EpollEvent, int) (int, error)
pkg syscall (linux-386), func Faccessat(int, string, uint32, int) error
pkg syscall (linux-386), func Fallocate(int, uint32, int64, int64) error
pkg syscall (linux-386), func Fchdir(int) error
pkg syscall (linux-386), func Fchmod(int, uint32) error
pkg syscall (linux-386), func Fchmodat(int, string, uint32, int) error

  }

  fun assertRequests(vararg expectedHosts: String?) {
    assertThat(requestedHosts).containsExactly(*expectedHosts)
    requestedHosts.clear()
  }

  /** Allocates and returns `count` fake IPv4 addresses like [255.0.0.100, 255.0.0.101].  */
  fun allocate(count: Int): List<InetAddress> {
    val from = nextAddress
    nextAddress += count
    return (from until nextAddress)
      .map {

        // Allocate regions larger than pool buffer size to force new allocations
        RdmaMemoryRegion region1 = bufferManager.getSendRegion(131072); // 128KB > 64KB pool size
        RdmaMemoryRegion region2 = bufferManager.getSendRegion(131072); // Another large allocation

        assertTrue(bufferManager.getTotalAllocated() > initialAllocated, "Total allocated should increase");

     * Test that buffer cache handles allocation when cache is full.
     */
    @Test
    public void testBufferAllocationWhenCacheFull() {
        // Given - Allocate many buffers to potentially fill the cache
        List<byte[]> buffers = new ArrayList<>();

        // Allocate more buffers than cache can hold
        for (int i = 0; i < 20; i++) {
            byte[] buffer = BufferCache.getBuffer();

//     length. For example, make([]int, 0, 10) allocates an underlying array
//     of size 10 and returns a slice of length 0 and capacity 10 that is
//     backed by this underlying array.
//   - Map: An empty map is allocated with enough space to hold the
//     specified number of elements. The size may be omitted, in which case
//     a small starting size is allocated.

            assertTrue(initialAllocated >= 2, "Should have allocated at least 2 regions");
            assertTrue(initialActive >= 2, "Should have at least 2 active regions");

            // Test buffer release and reuse
            bufferManager.releaseSendRegion(sendRegion);
            bufferManager.releaseReceiveRegion(recvRegion);

            // Allocate again to test pooling