diff --git a/jni/pjproject-android/.svn/pristine/3c/3c9aa2777655f77a89e66bcab25ff0b48c31ae59.svn-base b/jni/pjproject-android/.svn/pristine/3c/3c9aa2777655f77a89e66bcab25ff0b48c31ae59.svn-base
new file mode 100644
index 0000000..948727c
--- /dev/null
+++ b/jni/pjproject-android/.svn/pristine/3c/3c9aa2777655f77a89e66bcab25ff0b48c31ae59.svn-base
@@ -0,0 +1,1443 @@
+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#include <pj/ioqueue.h>
+#include <pj/os.h>
+#include <pj/lock.h>
+#include <pj/pool.h>
+#include <pj/string.h>
+#include <pj/sock.h>
+#include <pj/array.h>
+#include <pj/log.h>
+#include <pj/assert.h>
+#include <pj/errno.h>
+#include <pj/compat/socket.h>
+
+
+#if defined(PJ_HAS_WINSOCK2_H) && PJ_HAS_WINSOCK2_H != 0
+#  include <winsock2.h>
+#elif defined(PJ_HAS_WINSOCK_H) && PJ_HAS_WINSOCK_H != 0
+#  include <winsock.h>
+#endif
+
+#if defined(PJ_HAS_MSWSOCK_H) && PJ_HAS_MSWSOCK_H != 0
+#  include <mswsock.h>
+#endif
+
+
+/* The address specified in AcceptEx() must be 16 more than the size of
+ * SOCKADDR (source: MSDN).
+ */
+#define ACCEPT_ADDR_LEN	    (sizeof(pj_sockaddr_in)+16)
+
+typedef struct generic_overlapped
+{
+    WSAOVERLAPPED	   overlapped;
+    pj_ioqueue_operation_e operation;
+} generic_overlapped;
+
+/*
+ * OVERLAPPPED structure for send and receive.
+ */
+typedef struct ioqueue_overlapped
+{
+    WSAOVERLAPPED	   overlapped;
+    pj_ioqueue_operation_e operation;
+    WSABUF		   wsabuf;
+    pj_sockaddr_in         dummy_addr;
+    int                    dummy_addrlen;
+} ioqueue_overlapped;
+
+#if PJ_HAS_TCP
+/*
+ * OVERLAP structure for accept.
+ */
+typedef struct ioqueue_accept_rec
+{
+    WSAOVERLAPPED	    overlapped;
+    pj_ioqueue_operation_e  operation;
+    pj_sock_t		    newsock;
+    pj_sock_t		   *newsock_ptr;
+    int			   *addrlen;
+    void		   *remote;
+    void		   *local;
+    char		    accept_buf[2 * ACCEPT_ADDR_LEN];
+} ioqueue_accept_rec;
+#endif
+
+/*
+ * Structure to hold pending operation key.
+ */
+union operation_key
+{
+    generic_overlapped      generic;
+    ioqueue_overlapped      overlapped;
+#if PJ_HAS_TCP
+    ioqueue_accept_rec      accept;
+#endif
+};
+
+/* Type of handle in the key. */
+enum handle_type
+{
+    HND_IS_UNKNOWN,
+    HND_IS_FILE,
+    HND_IS_SOCKET,
+};
+
+enum { POST_QUIT_LEN = 0xFFFFDEADUL };
+
+/*
+ * Structure for individual socket.
+ */
+struct pj_ioqueue_key_t
+{
+    PJ_DECL_LIST_MEMBER(struct pj_ioqueue_key_t);
+
+    pj_ioqueue_t       *ioqueue;
+    HANDLE		hnd;
+    void	       *user_data;
+    enum handle_type    hnd_type;
+    pj_ioqueue_callback	cb;
+    pj_bool_t		allow_concurrent;
+
+#if PJ_HAS_TCP
+    int			connecting;
+#endif
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    pj_atomic_t	       *ref_count;
+    pj_bool_t		closing;
+    pj_time_val		free_time;
+    pj_mutex_t	       *mutex;
+#endif
+
+};
+
+/*
+ * IO Queue structure.
+ */
+struct pj_ioqueue_t
+{
+    HANDLE	      iocp;
+    pj_lock_t        *lock;
+    pj_bool_t         auto_delete_lock;
+    pj_bool_t	      default_concurrency;
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    pj_ioqueue_key_t  active_list;
+    pj_ioqueue_key_t  free_list;
+    pj_ioqueue_key_t  closing_list;
+#endif
+
+    /* These are to keep track of connecting sockets */
+#if PJ_HAS_TCP
+    unsigned	      event_count;
+    HANDLE	      event_pool[MAXIMUM_WAIT_OBJECTS+1];
+    unsigned	      connecting_count;
+    HANDLE	      connecting_handles[MAXIMUM_WAIT_OBJECTS+1];
+    pj_ioqueue_key_t *connecting_keys[MAXIMUM_WAIT_OBJECTS+1];
+#endif
+};
+
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+/* Prototype */
+static void scan_closing_keys(pj_ioqueue_t *ioqueue);
+#endif
+
+
+#if PJ_HAS_TCP
+/*
+ * Process the socket when the overlapped accept() completed.
+ */
+static void ioqueue_on_accept_complete(pj_ioqueue_key_t *key,
+                                       ioqueue_accept_rec *accept_overlapped)
+{
+    struct sockaddr *local;
+    struct sockaddr *remote;
+    int locallen, remotelen;
+    pj_status_t status;
+
+    PJ_CHECK_STACK();
+
+    /* On WinXP or later, use SO_UPDATE_ACCEPT_CONTEXT so that socket 
+     * addresses can be obtained with getsockname() and getpeername().
+     */
+    status = setsockopt(accept_overlapped->newsock, SOL_SOCKET,
+                        SO_UPDATE_ACCEPT_CONTEXT, 
+                        (char*)&key->hnd, 
+                        sizeof(SOCKET));
+    /* SO_UPDATE_ACCEPT_CONTEXT is for WinXP or later.
+     * So ignore the error status.
+     */
+
+    /* Operation complete immediately. */
+    if (accept_overlapped->addrlen) {
+	GetAcceptExSockaddrs( accept_overlapped->accept_buf,
+			      0, 
+			      ACCEPT_ADDR_LEN,
+			      ACCEPT_ADDR_LEN,
+			      &local,
+			      &locallen,
+			      &remote,
+			      &remotelen);
+	if (*accept_overlapped->addrlen >= locallen) {
+	    if (accept_overlapped->local)
+		pj_memcpy(accept_overlapped->local, local, locallen);
+	    if (accept_overlapped->remote)
+		pj_memcpy(accept_overlapped->remote, remote, locallen);
+	} else {
+	    if (accept_overlapped->local)
+		pj_bzero(accept_overlapped->local, 
+			 *accept_overlapped->addrlen);
+	    if (accept_overlapped->remote)
+		pj_bzero(accept_overlapped->remote, 
+			 *accept_overlapped->addrlen);
+	}
+
+	*accept_overlapped->addrlen = locallen;
+    }
+    if (accept_overlapped->newsock_ptr)
+        *accept_overlapped->newsock_ptr = accept_overlapped->newsock;
+    accept_overlapped->operation = 0;
+}
+
+static void erase_connecting_socket( pj_ioqueue_t *ioqueue, unsigned pos)
+{
+    pj_ioqueue_key_t *key = ioqueue->connecting_keys[pos];
+    HANDLE hEvent = ioqueue->connecting_handles[pos];
+
+    /* Remove key from array of connecting handles. */
+    pj_array_erase(ioqueue->connecting_keys, sizeof(key),
+		   ioqueue->connecting_count, pos);
+    pj_array_erase(ioqueue->connecting_handles, sizeof(HANDLE),
+		   ioqueue->connecting_count, pos);
+    --ioqueue->connecting_count;
+
+    /* Disassociate the socket from the event. */
+    WSAEventSelect((pj_sock_t)key->hnd, hEvent, 0);
+
+    /* Put event object to pool. */
+    if (ioqueue->event_count < MAXIMUM_WAIT_OBJECTS) {
+	ioqueue->event_pool[ioqueue->event_count++] = hEvent;
+    } else {
+	/* Shouldn't happen. There should be no more pending connections
+	 * than max. 
+	 */
+	pj_assert(0);
+	CloseHandle(hEvent);
+    }
+
+}
+
+/*
+ * Poll for the completion of non-blocking connect().
+ * If there's a completion, the function return the key of the completed
+ * socket, and 'result' argument contains the connect() result. If connect()
+ * succeeded, 'result' will have value zero, otherwise will have the error
+ * code.
+ */
+static int check_connecting( pj_ioqueue_t *ioqueue )
+{
+    if (ioqueue->connecting_count) {
+	int i, count;
+	struct 
+	{
+	    pj_ioqueue_key_t *key;
+	    pj_status_t	      status;
+	} events[PJ_IOQUEUE_MAX_EVENTS_IN_SINGLE_POLL-1];
+
+	pj_lock_acquire(ioqueue->lock);
+	for (count=0; count<PJ_IOQUEUE_MAX_EVENTS_IN_SINGLE_POLL-1; ++count) {
+	    DWORD result;
+
+	    result = WaitForMultipleObjects(ioqueue->connecting_count,
+					    ioqueue->connecting_handles,
+					    FALSE, 0);
+	    if (result >= WAIT_OBJECT_0 && 
+		result < WAIT_OBJECT_0+ioqueue->connecting_count) 
+	    {
+		WSANETWORKEVENTS net_events;
+
+		/* Got completed connect(). */
+		unsigned pos = result - WAIT_OBJECT_0;
+		events[count].key = ioqueue->connecting_keys[pos];
+
+		/* See whether connect has succeeded. */
+		WSAEnumNetworkEvents((pj_sock_t)events[count].key->hnd, 
+				     ioqueue->connecting_handles[pos], 
+				     &net_events);
+		events[count].status = 
+		    PJ_STATUS_FROM_OS(net_events.iErrorCode[FD_CONNECT_BIT]);
+
+		/* Erase socket from pending connect. */
+		erase_connecting_socket(ioqueue, pos);
+	    } else {
+		/* No more events */
+		break;
+	    }
+	}
+	pj_lock_release(ioqueue->lock);
+
+	/* Call callbacks. */
+	for (i=0; i<count; ++i) {
+	    if (events[i].key->cb.on_connect_complete) {
+		events[i].key->cb.on_connect_complete(events[i].key, 
+						      events[i].status);
+	    }
+	}
+
+	return count;
+    }
+
+    return 0;
+    
+}
+#endif
+
+/*
+ * pj_ioqueue_name()
+ */
+PJ_DEF(const char*) pj_ioqueue_name(void)
+{
+    return "iocp";
+}
+
+/*
+ * pj_ioqueue_create()
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_create( pj_pool_t *pool, 
+				       pj_size_t max_fd,
+				       pj_ioqueue_t **p_ioqueue)
+{
+    pj_ioqueue_t *ioqueue;
+    unsigned i;
+    pj_status_t rc;
+
+    PJ_UNUSED_ARG(max_fd);
+    PJ_ASSERT_RETURN(pool && p_ioqueue, PJ_EINVAL);
+
+    rc = sizeof(union operation_key);
+
+    /* Check that sizeof(pj_ioqueue_op_key_t) makes sense. */
+    PJ_ASSERT_RETURN(sizeof(pj_ioqueue_op_key_t)-sizeof(void*) >= 
+                     sizeof(union operation_key), PJ_EBUG);
+
+    /* Create IOCP */
+    ioqueue = pj_pool_zalloc(pool, sizeof(*ioqueue));
+    ioqueue->iocp = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
+    if (ioqueue->iocp == NULL)
+	return PJ_RETURN_OS_ERROR(GetLastError());
+
+    /* Create IOCP mutex */
+    rc = pj_lock_create_recursive_mutex(pool, NULL, &ioqueue->lock);
+    if (rc != PJ_SUCCESS) {
+	CloseHandle(ioqueue->iocp);
+	return rc;
+    }
+
+    ioqueue->auto_delete_lock = PJ_TRUE;
+    ioqueue->default_concurrency = PJ_IOQUEUE_DEFAULT_ALLOW_CONCURRENCY;
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /*
+     * Create and initialize key pools.
+     */
+    pj_list_init(&ioqueue->active_list);
+    pj_list_init(&ioqueue->free_list);
+    pj_list_init(&ioqueue->closing_list);
+
+    /* Preallocate keys according to max_fd setting, and put them
+     * in free_list.
+     */
+    for (i=0; i<max_fd; ++i) {
+	pj_ioqueue_key_t *key;
+
+	key = pj_pool_alloc(pool, sizeof(pj_ioqueue_key_t));
+
+	rc = pj_atomic_create(pool, 0, &key->ref_count);
+	if (rc != PJ_SUCCESS) {
+	    key = ioqueue->free_list.next;
+	    while (key != &ioqueue->free_list) {
+		pj_atomic_destroy(key->ref_count);
+		pj_mutex_destroy(key->mutex);
+		key = key->next;
+	    }
+	    CloseHandle(ioqueue->iocp);
+	    return rc;
+	}
+
+	rc = pj_mutex_create_recursive(pool, "ioqkey", &key->mutex);
+	if (rc != PJ_SUCCESS) {
+	    pj_atomic_destroy(key->ref_count);
+	    key = ioqueue->free_list.next;
+	    while (key != &ioqueue->free_list) {
+		pj_atomic_destroy(key->ref_count);
+		pj_mutex_destroy(key->mutex);
+		key = key->next;
+	    }
+	    CloseHandle(ioqueue->iocp);
+	    return rc;
+	}
+
+	pj_list_push_back(&ioqueue->free_list, key);
+    }
+#endif
+
+    *p_ioqueue = ioqueue;
+
+    PJ_LOG(4, ("pjlib", "WinNT IOCP I/O Queue created (%p)", ioqueue));
+    return PJ_SUCCESS;
+}
+
+/*
+ * pj_ioqueue_destroy()
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_destroy( pj_ioqueue_t *ioqueue )
+{
+#if PJ_HAS_TCP
+    unsigned i;
+#endif
+    pj_ioqueue_key_t *key;
+
+    PJ_CHECK_STACK();
+    PJ_ASSERT_RETURN(ioqueue, PJ_EINVAL);
+
+    pj_lock_acquire(ioqueue->lock);
+
+#if PJ_HAS_TCP
+    /* Destroy events in the pool */
+    for (i=0; i<ioqueue->event_count; ++i) {
+	CloseHandle(ioqueue->event_pool[i]);
+    }
+    ioqueue->event_count = 0;
+#endif
+
+    if (CloseHandle(ioqueue->iocp) != TRUE)
+	return PJ_RETURN_OS_ERROR(GetLastError());
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Destroy reference counters */
+    key = ioqueue->active_list.next;
+    while (key != &ioqueue->active_list) {
+	pj_atomic_destroy(key->ref_count);
+	pj_mutex_destroy(key->mutex);
+	key = key->next;
+    }
+
+    key = ioqueue->closing_list.next;
+    while (key != &ioqueue->closing_list) {
+	pj_atomic_destroy(key->ref_count);
+	pj_mutex_destroy(key->mutex);
+	key = key->next;
+    }
+
+    key = ioqueue->free_list.next;
+    while (key != &ioqueue->free_list) {
+	pj_atomic_destroy(key->ref_count);
+	pj_mutex_destroy(key->mutex);
+	key = key->next;
+    }
+#endif
+
+    if (ioqueue->auto_delete_lock)
+        pj_lock_destroy(ioqueue->lock);
+
+    return PJ_SUCCESS;
+}
+
+
+PJ_DEF(pj_status_t) pj_ioqueue_set_default_concurrency(pj_ioqueue_t *ioqueue,
+						       pj_bool_t allow)
+{
+    PJ_ASSERT_RETURN(ioqueue != NULL, PJ_EINVAL);
+    ioqueue->default_concurrency = allow;
+    return PJ_SUCCESS;
+}
+
+/*
+ * pj_ioqueue_set_lock()
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_set_lock( pj_ioqueue_t *ioqueue, 
+					 pj_lock_t *lock,
+					 pj_bool_t auto_delete )
+{
+    PJ_ASSERT_RETURN(ioqueue && lock, PJ_EINVAL);
+
+    if (ioqueue->auto_delete_lock) {
+        pj_lock_destroy(ioqueue->lock);
+    }
+
+    ioqueue->lock = lock;
+    ioqueue->auto_delete_lock = auto_delete;
+
+    return PJ_SUCCESS;
+}
+
+/*
+ * pj_ioqueue_register_sock()
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_register_sock( pj_pool_t *pool,
+					      pj_ioqueue_t *ioqueue,
+					      pj_sock_t sock,
+					      void *user_data,
+					      const pj_ioqueue_callback *cb,
+					      pj_ioqueue_key_t **key )
+{
+    HANDLE hioq;
+    pj_ioqueue_key_t *rec;
+    u_long value;
+    int rc;
+
+    PJ_ASSERT_RETURN(pool && ioqueue && cb && key, PJ_EINVAL);
+
+    pj_lock_acquire(ioqueue->lock);
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Scan closing list first to release unused keys.
+     * Must do this with lock acquired.
+     */
+    scan_closing_keys(ioqueue);
+
+    /* If safe unregistration is used, then get the key record from
+     * the free list.
+     */
+    if (pj_list_empty(&ioqueue->free_list)) {
+	pj_lock_release(ioqueue->lock);
+	return PJ_ETOOMANY;
+    }
+
+    rec = ioqueue->free_list.next;
+    pj_list_erase(rec);
+
+    /* Set initial reference count to 1 */
+    pj_assert(pj_atomic_get(rec->ref_count) == 0);
+    pj_atomic_inc(rec->ref_count);
+
+    rec->closing = 0;
+
+#else
+    rec = pj_pool_zalloc(pool, sizeof(pj_ioqueue_key_t));
+#endif
+
+    /* Build the key for this socket. */
+    rec->ioqueue = ioqueue;
+    rec->hnd = (HANDLE)sock;
+    rec->hnd_type = HND_IS_SOCKET;
+    rec->user_data = user_data;
+    pj_memcpy(&rec->cb, cb, sizeof(pj_ioqueue_callback));
+
+    /* Set concurrency for this handle */
+    rc = pj_ioqueue_set_concurrency(rec, ioqueue->default_concurrency);
+    if (rc != PJ_SUCCESS) {
+	pj_lock_release(ioqueue->lock);
+	return rc;
+    }
+
+#if PJ_HAS_TCP
+    rec->connecting = 0;
+#endif
+
+    /* Set socket to nonblocking. */
+    value = 1;
+    rc = ioctlsocket(sock, FIONBIO, &value);
+    if (rc != 0) {
+	pj_lock_release(ioqueue->lock);
+        return PJ_RETURN_OS_ERROR(WSAGetLastError());
+    }
+
+    /* Associate with IOCP */
+    hioq = CreateIoCompletionPort((HANDLE)sock, ioqueue->iocp, (DWORD)rec, 0);
+    if (!hioq) {
+	pj_lock_release(ioqueue->lock);
+	return PJ_RETURN_OS_ERROR(GetLastError());
+    }
+
+    *key = rec;
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    pj_list_push_back(&ioqueue->active_list, rec);
+#endif
+
+    pj_lock_release(ioqueue->lock);
+
+    return PJ_SUCCESS;
+}
+
+
+/*
+ * pj_ioqueue_get_user_data()
+ */
+PJ_DEF(void*) pj_ioqueue_get_user_data( pj_ioqueue_key_t *key )
+{
+    PJ_ASSERT_RETURN(key, NULL);
+    return key->user_data;
+}
+
+/*
+ * pj_ioqueue_set_user_data()
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_set_user_data( pj_ioqueue_key_t *key,
+                                              void *user_data,
+                                              void **old_data )
+{
+    PJ_ASSERT_RETURN(key, PJ_EINVAL);
+    
+    if (old_data)
+        *old_data = key->user_data;
+
+    key->user_data = user_data;
+    return PJ_SUCCESS;
+}
+
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+/* Decrement the key's reference counter, and when the counter reach zero,
+ * destroy the key.
+ */
+static void decrement_counter(pj_ioqueue_key_t *key)
+{
+    if (pj_atomic_dec_and_get(key->ref_count) == 0) {
+
+	pj_lock_acquire(key->ioqueue->lock);
+
+	pj_assert(key->closing == 1);
+	pj_gettickcount(&key->free_time);
+	key->free_time.msec += PJ_IOQUEUE_KEY_FREE_DELAY;
+	pj_time_val_normalize(&key->free_time);
+
+	pj_list_erase(key);
+	pj_list_push_back(&key->ioqueue->closing_list, key);
+
+	pj_lock_release(key->ioqueue->lock);
+    }
+}
+#endif
+
+/*
+ * Poll the I/O Completion Port, execute callback, 
+ * and return the key and bytes transfered of the last operation.
+ */
+static pj_bool_t poll_iocp( HANDLE hIocp, DWORD dwTimeout, 
+			    pj_ssize_t *p_bytes, pj_ioqueue_key_t **p_key )
+{
+    DWORD dwBytesTransfered, dwKey;
+    generic_overlapped *pOv;
+    pj_ioqueue_key_t *key;
+    pj_ssize_t size_status = -1;
+    BOOL rcGetQueued;
+
+    /* Poll for completion status. */
+    rcGetQueued = GetQueuedCompletionStatus(hIocp, &dwBytesTransfered,
+					    &dwKey, (OVERLAPPED**)&pOv, 
+					    dwTimeout);
+
+    /* The return value is:
+     * - nonzero if event was dequeued.
+     * - zero and pOv==NULL if no event was dequeued.
+     * - zero and pOv!=NULL if event for failed I/O was dequeued.
+     */
+    if (pOv) {
+	pj_bool_t has_lock;
+
+	/* Event was dequeued for either successfull or failed I/O */
+	key = (pj_ioqueue_key_t*)dwKey;
+	size_status = dwBytesTransfered;
+
+	/* Report to caller regardless */
+	if (p_bytes)
+	    *p_bytes = size_status;
+	if (p_key)
+	    *p_key = key;
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+	/* We shouldn't call callbacks if key is quitting. */
+	if (key->closing)
+	    return PJ_TRUE;
+
+	/* If concurrency is disabled, lock the key 
+	 * (and save the lock status to local var since app may change
+	 * concurrency setting while in the callback) */
+	if (key->allow_concurrent == PJ_FALSE) {
+	    pj_mutex_lock(key->mutex);
+	    has_lock = PJ_TRUE;
+	} else {
+	    has_lock = PJ_FALSE;
+	}
+
+	/* Now that we get the lock, check again that key is not closing */
+	if (key->closing) {
+	    if (has_lock) {
+		pj_mutex_unlock(key->mutex);
+	    }
+	    return PJ_TRUE;
+	}
+
+	/* Increment reference counter to prevent this key from being
+	 * deleted
+	 */
+	pj_atomic_inc(key->ref_count);
+#else
+	PJ_UNUSED_ARG(has_lock);
+#endif
+
+	/* Carry out the callback */
+	switch (pOv->operation) {
+	case PJ_IOQUEUE_OP_READ:
+	case PJ_IOQUEUE_OP_RECV:
+	case PJ_IOQUEUE_OP_RECV_FROM:
+            pOv->operation = 0;
+            if (key->cb.on_read_complete)
+	        key->cb.on_read_complete(key, (pj_ioqueue_op_key_t*)pOv, 
+                                         size_status);
+	    break;
+	case PJ_IOQUEUE_OP_WRITE:
+	case PJ_IOQUEUE_OP_SEND:
+	case PJ_IOQUEUE_OP_SEND_TO:
+            pOv->operation = 0;
+            if (key->cb.on_write_complete)
+	        key->cb.on_write_complete(key, (pj_ioqueue_op_key_t*)pOv, 
+                                                size_status);
+	    break;
+#if PJ_HAS_TCP
+	case PJ_IOQUEUE_OP_ACCEPT:
+	    /* special case for accept. */
+	    ioqueue_on_accept_complete(key, (ioqueue_accept_rec*)pOv);
+            if (key->cb.on_accept_complete) {
+                ioqueue_accept_rec *accept_rec = (ioqueue_accept_rec*)pOv;
+		pj_status_t status = PJ_SUCCESS;
+		pj_sock_t newsock;
+
+		newsock = accept_rec->newsock;
+		accept_rec->newsock = PJ_INVALID_SOCKET;
+
+		if (newsock == PJ_INVALID_SOCKET) {
+		    int dwError = WSAGetLastError();
+		    if (dwError == 0) dwError = OSERR_ENOTCONN;
+		    status = PJ_RETURN_OS_ERROR(dwError);
+		}
+
+	        key->cb.on_accept_complete(key, (pj_ioqueue_op_key_t*)pOv,
+                                           newsock, status);
+		
+            }
+	    break;
+	case PJ_IOQUEUE_OP_CONNECT:
+#endif
+	case PJ_IOQUEUE_OP_NONE:
+	    pj_assert(0);
+	    break;
+	}
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+	decrement_counter(key);
+	if (has_lock)
+	    pj_mutex_unlock(key->mutex);
+#endif
+
+	return PJ_TRUE;
+    }
+
+    /* No event was queued. */
+    return PJ_FALSE;
+}
+
+/*
+ * pj_ioqueue_unregister()
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_unregister( pj_ioqueue_key_t *key )
+{
+    unsigned i;
+    pj_bool_t has_lock;
+    enum { RETRY = 10 };
+
+    PJ_ASSERT_RETURN(key, PJ_EINVAL);
+
+#if PJ_HAS_TCP
+    if (key->connecting) {
+	unsigned pos;
+        pj_ioqueue_t *ioqueue;
+
+        ioqueue = key->ioqueue;
+
+	/* Erase from connecting_handles */
+	pj_lock_acquire(ioqueue->lock);
+	for (pos=0; pos < ioqueue->connecting_count; ++pos) {
+	    if (ioqueue->connecting_keys[pos] == key) {
+		erase_connecting_socket(ioqueue, pos);
+		break;
+	    }
+	}
+	key->connecting = 0;
+	pj_lock_release(ioqueue->lock);
+    }
+#endif
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Mark key as closing before closing handle. */
+    key->closing = 1;
+
+    /* If concurrency is disabled, wait until the key has finished
+     * processing the callback
+     */
+    if (key->allow_concurrent == PJ_FALSE) {
+	pj_mutex_lock(key->mutex);
+	has_lock = PJ_TRUE;
+    } else {
+	has_lock = PJ_FALSE;
+    }
+#else
+    PJ_UNUSED_ARG(has_lock);
+#endif
+    
+    /* Close handle (the only way to disassociate handle from IOCP). 
+     * We also need to close handle to make sure that no further events
+     * will come to the handle.
+     */
+    /* Update 2008/07/18 (http://trac.pjsip.org/repos/ticket/575):
+     *  - It seems that CloseHandle() in itself does not actually close
+     *    the socket (i.e. it will still appear in "netstat" output). Also
+     *    if we only use CloseHandle(), an "Invalid Handle" exception will
+     *    be raised in WSACleanup().
+     *  - MSDN documentation says that CloseHandle() must be called after 
+     *    closesocket() call (see
+     *    http://msdn.microsoft.com/en-us/library/ms724211(VS.85).aspx).
+     *    But turns out that this will raise "Invalid Handle" exception
+     *    in debug mode.
+     *  So because of this, we replaced CloseHandle() with closesocket()
+     *  instead. These was tested on WinXP SP2.
+     */
+    //CloseHandle(key->hnd);
+    pj_sock_close((pj_sock_t)key->hnd);
+
+    /* Reset callbacks */
+    key->cb.on_accept_complete = NULL;
+    key->cb.on_connect_complete = NULL;
+    key->cb.on_read_complete = NULL;
+    key->cb.on_write_complete = NULL;
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Even after handle is closed, I suspect that IOCP may still try to
+     * do something with the handle, causing memory corruption when pool
+     * debugging is enabled.
+     *
+     * Forcing context switch seems to have fixed that, but this is quite
+     * an ugly solution..
+     *
+     * Update 2008/02/13:
+     *	This should not happen if concurrency is disallowed for the key.
+     *  So at least application has a solution for this (i.e. by disallowing
+     *  concurrency in the key).
+     */
+    //This will loop forever if unregistration is done on the callback.
+    //Doing this with RETRY I think should solve the IOCP setting the 
+    //socket signalled, without causing the deadlock.
+    //while (pj_atomic_get(key->ref_count) != 1)
+    //	pj_thread_sleep(0);
+    for (i=0; pj_atomic_get(key->ref_count) != 1 && i<RETRY; ++i)
+	pj_thread_sleep(0);
+
+    /* Decrement reference counter to destroy the key. */
+    decrement_counter(key);
+
+    if (has_lock)
+	pj_mutex_unlock(key->mutex);
+#endif
+
+    return PJ_SUCCESS;
+}
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+/* Scan the closing list, and put pending closing keys to free list.
+ * Must do this with ioqueue mutex held.
+ */
+static void scan_closing_keys(pj_ioqueue_t *ioqueue)
+{
+    if (!pj_list_empty(&ioqueue->closing_list)) {
+	pj_time_val now;
+	pj_ioqueue_key_t *key;
+
+	pj_gettickcount(&now);
+	
+	/* Move closing keys to free list when they've finished the closing
+	 * idle time.
+	 */
+	key = ioqueue->closing_list.next;
+	while (key != &ioqueue->closing_list) {
+	    pj_ioqueue_key_t *next = key->next;
+
+	    pj_assert(key->closing != 0);
+
+	    if (PJ_TIME_VAL_GTE(now, key->free_time)) {
+		pj_list_erase(key);
+		pj_list_push_back(&ioqueue->free_list, key);
+	    }
+	    key = next;
+	}
+    }
+}
+#endif
+
+/*
+ * pj_ioqueue_poll()
+ *
+ * Poll for events.
+ */
+PJ_DEF(int) pj_ioqueue_poll( pj_ioqueue_t *ioqueue, const pj_time_val *timeout)
+{
+    DWORD dwMsec;
+#if PJ_HAS_TCP
+    int connect_count = 0;
+#endif
+    int event_count = 0;
+
+    PJ_ASSERT_RETURN(ioqueue, -PJ_EINVAL);
+
+    /* Calculate miliseconds timeout for GetQueuedCompletionStatus */
+    dwMsec = timeout ? timeout->sec*1000 + timeout->msec : INFINITE;
+
+    /* Poll for completion status. */
+    event_count = poll_iocp(ioqueue->iocp, dwMsec, NULL, NULL);
+
+#if PJ_HAS_TCP
+    /* Check the connecting array, only when there's no activity. */
+    if (event_count == 0) {
+	connect_count = check_connecting(ioqueue);
+	if (connect_count > 0)
+	    event_count += connect_count;
+    }
+#endif
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Check the closing keys only when there's no activity and when there are
+     * pending closing keys.
+     */
+    if (event_count == 0 && !pj_list_empty(&ioqueue->closing_list)) {
+	pj_lock_acquire(ioqueue->lock);
+	scan_closing_keys(ioqueue);
+	pj_lock_release(ioqueue->lock);
+    }
+#endif
+
+    /* Return number of events. */
+    return event_count;
+}
+
+/*
+ * pj_ioqueue_recv()
+ *
+ * Initiate overlapped WSARecv() operation.
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_recv(  pj_ioqueue_key_t *key,
+                                      pj_ioqueue_op_key_t *op_key,
+				      void *buffer,
+				      pj_ssize_t *length,
+				      pj_uint32_t flags )
+{
+    /*
+     * Ideally we should just call pj_ioqueue_recvfrom() with NULL addr and
+     * addrlen here. But unfortunately it generates EINVAL... :-(
+     *  -bennylp
+     */
+    int rc;
+    DWORD bytesRead;
+    DWORD dwFlags = 0;
+    union operation_key *op_key_rec;
+
+    PJ_CHECK_STACK();
+    PJ_ASSERT_RETURN(key && op_key && buffer && length, PJ_EINVAL);
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Check key is not closing */
+    if (key->closing)
+	return PJ_ECANCELLED;
+#endif
+
+    op_key_rec = (union operation_key*)op_key->internal__;
+    op_key_rec->overlapped.wsabuf.buf = buffer;
+    op_key_rec->overlapped.wsabuf.len = *length;
+
+    dwFlags = flags;
+    
+    /* Try non-overlapped received first to see if data is
+     * immediately available.
+     */
+    if ((flags & PJ_IOQUEUE_ALWAYS_ASYNC) == 0) {
+	rc = WSARecv((SOCKET)key->hnd, &op_key_rec->overlapped.wsabuf, 1,
+		     &bytesRead, &dwFlags, NULL, NULL);
+	if (rc == 0) {
+	    *length = bytesRead;
+	    return PJ_SUCCESS;
+	} else {
+	    DWORD dwError = WSAGetLastError();
+	    if (dwError != WSAEWOULDBLOCK) {
+		*length = -1;
+		return PJ_RETURN_OS_ERROR(dwError);
+	    }
+	}
+    }
+
+    dwFlags &= ~(PJ_IOQUEUE_ALWAYS_ASYNC);
+
+    /*
+     * No immediate data available.
+     * Register overlapped Recv() operation.
+     */
+    pj_bzero( &op_key_rec->overlapped.overlapped, 
+              sizeof(op_key_rec->overlapped.overlapped));
+    op_key_rec->overlapped.operation = PJ_IOQUEUE_OP_RECV;
+
+    rc = WSARecv((SOCKET)key->hnd, &op_key_rec->overlapped.wsabuf, 1, 
+                  &bytesRead, &dwFlags, 
+		  &op_key_rec->overlapped.overlapped, NULL);
+    if (rc == SOCKET_ERROR) {
+	DWORD dwStatus = WSAGetLastError();
+        if (dwStatus!=WSA_IO_PENDING) {
+            *length = -1;
+            return PJ_STATUS_FROM_OS(dwStatus);
+        }
+    }
+
+    /* Pending operation has been scheduled. */
+    return PJ_EPENDING;
+}
+
+/*
+ * pj_ioqueue_recvfrom()
+ *
+ * Initiate overlapped RecvFrom() operation.
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_recvfrom( pj_ioqueue_key_t *key,
+                                         pj_ioqueue_op_key_t *op_key,
+					 void *buffer,
+					 pj_ssize_t *length,
+                                         pj_uint32_t flags,
+					 pj_sockaddr_t *addr,
+					 int *addrlen)
+{
+    int rc;
+    DWORD bytesRead;
+    DWORD dwFlags = 0;
+    union operation_key *op_key_rec;
+
+    PJ_CHECK_STACK();
+    PJ_ASSERT_RETURN(key && op_key && buffer, PJ_EINVAL);
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Check key is not closing */
+    if (key->closing)
+	return PJ_ECANCELLED;
+#endif
+
+    op_key_rec = (union operation_key*)op_key->internal__;
+    op_key_rec->overlapped.wsabuf.buf = buffer;
+    op_key_rec->overlapped.wsabuf.len = *length;
+
+    dwFlags = flags;
+    
+    /* Try non-overlapped received first to see if data is
+     * immediately available.
+     */
+    if ((flags & PJ_IOQUEUE_ALWAYS_ASYNC) == 0) {
+	rc = WSARecvFrom((SOCKET)key->hnd, &op_key_rec->overlapped.wsabuf, 1,
+			 &bytesRead, &dwFlags, addr, addrlen, NULL, NULL);
+	if (rc == 0) {
+	    *length = bytesRead;
+	    return PJ_SUCCESS;
+	} else {
+	    DWORD dwError = WSAGetLastError();
+	    if (dwError != WSAEWOULDBLOCK) {
+		*length = -1;
+		return PJ_RETURN_OS_ERROR(dwError);
+	    }
+	}
+    }
+
+    dwFlags &= ~(PJ_IOQUEUE_ALWAYS_ASYNC);
+
+    /*
+     * No immediate data available.
+     * Register overlapped Recv() operation.
+     */
+    pj_bzero( &op_key_rec->overlapped.overlapped, 
+              sizeof(op_key_rec->overlapped.overlapped));
+    op_key_rec->overlapped.operation = PJ_IOQUEUE_OP_RECV;
+
+    rc = WSARecvFrom((SOCKET)key->hnd, &op_key_rec->overlapped.wsabuf, 1, 
+                     &bytesRead, &dwFlags, addr, addrlen,
+		     &op_key_rec->overlapped.overlapped, NULL);
+    if (rc == SOCKET_ERROR) {
+	DWORD dwStatus = WSAGetLastError();
+        if (dwStatus!=WSA_IO_PENDING) {
+            *length = -1;
+            return PJ_STATUS_FROM_OS(dwStatus);
+        }
+    } 
+    
+    /* Pending operation has been scheduled. */
+    return PJ_EPENDING;
+}
+
+/*
+ * pj_ioqueue_send()
+ *
+ * Initiate overlapped Send operation.
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_send(  pj_ioqueue_key_t *key,
+                                      pj_ioqueue_op_key_t *op_key,
+				      const void *data,
+				      pj_ssize_t *length,
+				      pj_uint32_t flags )
+{
+    return pj_ioqueue_sendto(key, op_key, data, length, flags, NULL, 0);
+}
+
+
+/*
+ * pj_ioqueue_sendto()
+ *
+ * Initiate overlapped SendTo operation.
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_sendto( pj_ioqueue_key_t *key,
+                                       pj_ioqueue_op_key_t *op_key,
+				       const void *data,
+				       pj_ssize_t *length,
+                                       pj_uint32_t flags,
+				       const pj_sockaddr_t *addr,
+				       int addrlen)
+{
+    int rc;
+    DWORD bytesWritten;
+    DWORD dwFlags;
+    union operation_key *op_key_rec;
+
+    PJ_CHECK_STACK();
+    PJ_ASSERT_RETURN(key && op_key && data, PJ_EINVAL);
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Check key is not closing */
+    if (key->closing)
+	return PJ_ECANCELLED;
+#endif
+
+    op_key_rec = (union operation_key*)op_key->internal__;
+
+    /*
+     * First try blocking write.
+     */
+    op_key_rec->overlapped.wsabuf.buf = (void*)data;
+    op_key_rec->overlapped.wsabuf.len = *length;
+
+    dwFlags = flags;
+
+    if ((flags & PJ_IOQUEUE_ALWAYS_ASYNC) == 0) {
+	rc = WSASendTo((SOCKET)key->hnd, &op_key_rec->overlapped.wsabuf, 1,
+		       &bytesWritten, dwFlags, addr, addrlen,
+		       NULL, NULL);
+	if (rc == 0) {
+	    *length = bytesWritten;
+	    return PJ_SUCCESS;
+	} else {
+	    DWORD dwStatus = WSAGetLastError();
+	    if (dwStatus != WSAEWOULDBLOCK) {
+		*length = -1;
+		return PJ_RETURN_OS_ERROR(dwStatus);
+	    }
+	}
+    }
+
+    dwFlags &= ~(PJ_IOQUEUE_ALWAYS_ASYNC);
+
+    /*
+     * Data can't be sent immediately.
+     * Schedule asynchronous WSASend().
+     */
+    pj_bzero( &op_key_rec->overlapped.overlapped, 
+              sizeof(op_key_rec->overlapped.overlapped));
+    op_key_rec->overlapped.operation = PJ_IOQUEUE_OP_SEND;
+
+    rc = WSASendTo((SOCKET)key->hnd, &op_key_rec->overlapped.wsabuf, 1,
+                   &bytesWritten,  dwFlags, addr, addrlen,
+		   &op_key_rec->overlapped.overlapped, NULL);
+    if (rc == SOCKET_ERROR) {
+	DWORD dwStatus = WSAGetLastError();
+        if (dwStatus!=WSA_IO_PENDING)
+            return PJ_STATUS_FROM_OS(dwStatus);
+    }
+
+    /* Asynchronous operation successfully submitted. */
+    return PJ_EPENDING;
+}
+
+#if PJ_HAS_TCP
+
+/*
+ * pj_ioqueue_accept()
+ *
+ * Initiate overlapped accept() operation.
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_accept( pj_ioqueue_key_t *key,
+                                       pj_ioqueue_op_key_t *op_key,
+			               pj_sock_t *new_sock,
+			               pj_sockaddr_t *local,
+			               pj_sockaddr_t *remote,
+			               int *addrlen)
+{
+    BOOL rc;
+    DWORD bytesReceived;
+    pj_status_t status;
+    union operation_key *op_key_rec;
+    SOCKET sock;
+
+    PJ_CHECK_STACK();
+    PJ_ASSERT_RETURN(key && op_key && new_sock, PJ_EINVAL);
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Check key is not closing */
+    if (key->closing)
+	return PJ_ECANCELLED;
+#endif
+
+    /*
+     * See if there is a new connection immediately available.
+     */
+    sock = WSAAccept((SOCKET)key->hnd, remote, addrlen, NULL, 0);
+    if (sock != INVALID_SOCKET) {
+        /* Yes! New socket is available! */
+	if (local && addrlen) {
+	    int status;
+
+	    /* On WinXP or later, use SO_UPDATE_ACCEPT_CONTEXT so that socket 
+	     * addresses can be obtained with getsockname() and getpeername().
+	     */
+	    status = setsockopt(sock, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
+				(char*)&key->hnd, sizeof(SOCKET));
+	    /* SO_UPDATE_ACCEPT_CONTEXT is for WinXP or later.
+	     * So ignore the error status.
+	     */
+
+	    status = getsockname(sock, local, addrlen);
+	    if (status != 0) {
+		DWORD dwError = WSAGetLastError();
+		closesocket(sock);
+		return PJ_RETURN_OS_ERROR(dwError);
+	    }
+	}
+
+        *new_sock = sock;
+        return PJ_SUCCESS;
+
+    } else {
+        DWORD dwError = WSAGetLastError();
+        if (dwError != WSAEWOULDBLOCK) {
+            return PJ_RETURN_OS_ERROR(dwError);
+        }
+    }
+
+    /*
+     * No connection is immediately available.
+     * Must schedule an asynchronous operation.
+     */
+    op_key_rec = (union operation_key*)op_key->internal__;
+    
+    status = pj_sock_socket(pj_AF_INET(), pj_SOCK_STREAM(), 0, 
+                            &op_key_rec->accept.newsock);
+    if (status != PJ_SUCCESS)
+	return status;
+
+    op_key_rec->accept.operation = PJ_IOQUEUE_OP_ACCEPT;
+    op_key_rec->accept.addrlen = addrlen;
+    op_key_rec->accept.local = local;
+    op_key_rec->accept.remote = remote;
+    op_key_rec->accept.newsock_ptr = new_sock;
+    pj_bzero( &op_key_rec->accept.overlapped, 
+	      sizeof(op_key_rec->accept.overlapped));
+
+    rc = AcceptEx( (SOCKET)key->hnd, (SOCKET)op_key_rec->accept.newsock,
+		   op_key_rec->accept.accept_buf,
+		   0, ACCEPT_ADDR_LEN, ACCEPT_ADDR_LEN,
+		   &bytesReceived,
+		   &op_key_rec->accept.overlapped );
+
+    if (rc == TRUE) {
+	ioqueue_on_accept_complete(key, &op_key_rec->accept);
+	return PJ_SUCCESS;
+    } else {
+	DWORD dwStatus = WSAGetLastError();
+	if (dwStatus!=WSA_IO_PENDING)
+            return PJ_STATUS_FROM_OS(dwStatus);
+    }
+
+    /* Asynchronous Accept() has been submitted. */
+    return PJ_EPENDING;
+}
+
+
+/*
+ * pj_ioqueue_connect()
+ *
+ * Initiate overlapped connect() operation (well, it's non-blocking actually,
+ * since there's no overlapped version of connect()).
+ */
+PJ_DEF(pj_status_t) pj_ioqueue_connect( pj_ioqueue_key_t *key,
+					const pj_sockaddr_t *addr,
+					int addrlen )
+{
+    HANDLE hEvent;
+    pj_ioqueue_t *ioqueue;
+
+    PJ_CHECK_STACK();
+    PJ_ASSERT_RETURN(key && addr && addrlen, PJ_EINVAL);
+
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    /* Check key is not closing */
+    if (key->closing)
+	return PJ_ECANCELLED;
+#endif
+
+    /* Initiate connect() */
+    if (connect((pj_sock_t)key->hnd, addr, addrlen) != 0) {
+	DWORD dwStatus;
+	dwStatus = WSAGetLastError();
+        if (dwStatus != WSAEWOULDBLOCK) {
+	    return PJ_RETURN_OS_ERROR(dwStatus);
+	}
+    } else {
+	/* Connect has completed immediately! */
+	return PJ_SUCCESS;
+    }
+
+    ioqueue = key->ioqueue;
+
+    /* Add to the array of connecting socket to be polled */
+    pj_lock_acquire(ioqueue->lock);
+
+    if (ioqueue->connecting_count >= MAXIMUM_WAIT_OBJECTS) {
+	pj_lock_release(ioqueue->lock);
+	return PJ_ETOOMANYCONN;
+    }
+
+    /* Get or create event object. */
+    if (ioqueue->event_count) {
+	hEvent = ioqueue->event_pool[ioqueue->event_count - 1];
+	--ioqueue->event_count;
+    } else {
+	hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+	if (hEvent == NULL) {
+	    DWORD dwStatus = GetLastError();
+	    pj_lock_release(ioqueue->lock);
+	    return PJ_STATUS_FROM_OS(dwStatus);
+	}
+    }
+
+    /* Mark key as connecting.
+     * We can't use array index since key can be removed dynamically. 
+     */
+    key->connecting = 1;
+
+    /* Associate socket events to the event object. */
+    if (WSAEventSelect((pj_sock_t)key->hnd, hEvent, FD_CONNECT) != 0) {
+	CloseHandle(hEvent);
+	pj_lock_release(ioqueue->lock);
+	return PJ_RETURN_OS_ERROR(WSAGetLastError());
+    }
+
+    /* Add to array. */
+    ioqueue->connecting_keys[ ioqueue->connecting_count ] = key;
+    ioqueue->connecting_handles[ ioqueue->connecting_count ] = hEvent;
+    ioqueue->connecting_count++;
+
+    pj_lock_release(ioqueue->lock);
+
+    return PJ_EPENDING;
+}
+#endif	/* #if PJ_HAS_TCP */
+
+
+PJ_DEF(void) pj_ioqueue_op_key_init( pj_ioqueue_op_key_t *op_key,
+				     pj_size_t size )
+{
+    pj_bzero(op_key, size);
+}
+
+PJ_DEF(pj_bool_t) pj_ioqueue_is_pending( pj_ioqueue_key_t *key,
+                                         pj_ioqueue_op_key_t *op_key )
+{
+    BOOL rc;
+    DWORD bytesTransfered;
+
+    rc = GetOverlappedResult( key->hnd, (LPOVERLAPPED)op_key,
+                              &bytesTransfered, FALSE );
+
+    if (rc == FALSE) {
+        return GetLastError()==ERROR_IO_INCOMPLETE;
+    }
+
+    return FALSE;
+}
+
+
+PJ_DEF(pj_status_t) pj_ioqueue_post_completion( pj_ioqueue_key_t *key,
+                                                pj_ioqueue_op_key_t *op_key,
+                                                pj_ssize_t bytes_status )
+{
+    BOOL rc;
+
+    rc = PostQueuedCompletionStatus(key->ioqueue->iocp, bytes_status,
+                                    (long)key, (OVERLAPPED*)op_key );
+    if (rc == FALSE) {
+        return PJ_RETURN_OS_ERROR(GetLastError());
+    }
+
+    return PJ_SUCCESS;
+}
+
+PJ_DEF(pj_status_t) pj_ioqueue_set_concurrency(pj_ioqueue_key_t *key,
+					       pj_bool_t allow)
+{
+    PJ_ASSERT_RETURN(key, PJ_EINVAL);
+
+    /* PJ_IOQUEUE_HAS_SAFE_UNREG must be enabled if concurrency is
+     * disabled.
+     */
+    PJ_ASSERT_RETURN(allow || PJ_IOQUEUE_HAS_SAFE_UNREG, PJ_EINVAL);
+
+    key->allow_concurrent = allow;
+    return PJ_SUCCESS;
+}
+
+PJ_DEF(pj_status_t) pj_ioqueue_lock_key(pj_ioqueue_key_t *key)
+{
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    return pj_mutex_lock(key->mutex);
+#else
+    PJ_ASSERT_RETURN(!"PJ_IOQUEUE_HAS_SAFE_UNREG is disabled", PJ_EINVALIDOP);
+#endif
+}
+
+PJ_DEF(pj_status_t) pj_ioqueue_unlock_key(pj_ioqueue_key_t *key)
+{
+#if PJ_IOQUEUE_HAS_SAFE_UNREG
+    return pj_mutex_unlock(key->mutex);
+#else
+    PJ_ASSERT_RETURN(!"PJ_IOQUEUE_HAS_SAFE_UNREG is disabled", PJ_EINVALIDOP);
+#endif
+}
+