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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <grpc/support/port_platform.h>
#ifdef GPR_WINSOCK_SOCKET
#include <winsock2.h>
#include <grpc/support/log.h>
#include <grpc/support/log_win32.h>
#include <grpc/support/alloc.h>
#include <grpc/support/thd.h>
#include "src/core/iomgr/alarm_internal.h"
#include "src/core/iomgr/iocp_windows.h"
#include "src/core/iomgr/iomgr_internal.h"
#include "src/core/iomgr/socket_windows.h"
static ULONG g_iocp_kick_token;
static OVERLAPPED g_iocp_custom_overlap;
static gpr_event g_shutdown_iocp;
static gpr_event g_iocp_done;
static gpr_atm g_custom_events = 0;
static HANDLE g_iocp;
static void
do_iocp_work ()
{
BOOL success;
DWORD bytes = 0;
DWORD flags = 0;
ULONG_PTR completion_key;
LPOVERLAPPED overlapped;
grpc_winsocket *socket;
grpc_winsocket_callback_info *info;
void (*f) (void *, int) = NULL;
void *opaque = NULL;
success = GetQueuedCompletionStatus (g_iocp, &bytes, &completion_key, &overlapped, INFINITE);
/* success = 0 and overlapped = NULL means the deadline got attained.
Which is impossible. since our wait time is +inf */
GPR_ASSERT (success || overlapped);
GPR_ASSERT (completion_key && overlapped);
if (overlapped == &g_iocp_custom_overlap)
{
gpr_atm_full_fetch_add (&g_custom_events, -1);
if (completion_key == (ULONG_PTR) & g_iocp_kick_token)
{
/* We were awoken from a kick. */
return;
}
gpr_log (GPR_ERROR, "Unknown custom completion key.");
abort ();
}
socket = (grpc_winsocket *) completion_key;
if (overlapped == &socket->write_info.overlapped)
{
info = &socket->write_info;
}
else if (overlapped == &socket->read_info.overlapped)
{
info = &socket->read_info;
}
else
{
gpr_log (GPR_ERROR, "Unknown IOCP operation");
abort ();
}
success = WSAGetOverlappedResult (socket->socket, &info->overlapped, &bytes, FALSE, &flags);
info->bytes_transfered = bytes;
info->wsa_error = success ? 0 : WSAGetLastError ();
GPR_ASSERT (overlapped == &info->overlapped);
GPR_ASSERT (!info->has_pending_iocp);
gpr_mu_lock (&socket->state_mu);
if (info->cb)
{
f = info->cb;
opaque = info->opaque;
info->cb = NULL;
}
else
{
info->has_pending_iocp = 1;
}
gpr_mu_unlock (&socket->state_mu);
if (f)
f (opaque, 1);
}
static void
iocp_loop (void *p)
{
while (gpr_atm_acq_load (&g_custom_events) || !gpr_event_get (&g_shutdown_iocp))
{
do_iocp_work ();
}
gpr_event_set (&g_iocp_done, (void *) 1);
}
void
grpc_iocp_init (void)
{
gpr_thd_id id;
g_iocp = CreateIoCompletionPort (INVALID_HANDLE_VALUE, NULL, (ULONG_PTR) NULL, 0);
GPR_ASSERT (g_iocp);
gpr_event_init (&g_iocp_done);
gpr_event_init (&g_shutdown_iocp);
gpr_thd_new (&id, iocp_loop, NULL, NULL);
}
void
grpc_iocp_kick (void)
{
BOOL success;
gpr_atm_full_fetch_add (&g_custom_events, 1);
success = PostQueuedCompletionStatus (g_iocp, 0, (ULONG_PTR) & g_iocp_kick_token, &g_iocp_custom_overlap);
GPR_ASSERT (success);
}
void
grpc_iocp_shutdown (void)
{
BOOL success;
gpr_event_set (&g_shutdown_iocp, (void *) 1);
grpc_iocp_kick ();
gpr_event_wait (&g_iocp_done, gpr_inf_future (GPR_CLOCK_REALTIME));
success = CloseHandle (g_iocp);
GPR_ASSERT (success);
}
void
grpc_iocp_add_socket (grpc_winsocket * socket)
{
HANDLE ret;
if (socket->added_to_iocp)
return;
ret = CreateIoCompletionPort ((HANDLE) socket->socket, g_iocp, (gpr_uintptr) socket, 0);
if (!ret)
{
char *utf8_message = gpr_format_message (WSAGetLastError ());
gpr_log (GPR_ERROR, "Unable to add socket to iocp: %s", utf8_message);
gpr_free (utf8_message);
__debugbreak ();
abort ();
}
socket->added_to_iocp = 1;
GPR_ASSERT (ret == g_iocp);
}
/* Calling notify_on_read or write means either of two things:
-) The IOCP already completed in the background, and we need to call
the callback now.
-) The IOCP hasn't completed yet, and we're queuing it for later. */
static void
socket_notify_on_iocp (grpc_winsocket * socket, void (*cb) (void *, int), void *opaque, grpc_winsocket_callback_info * info)
{
int run_now = 0;
GPR_ASSERT (!info->cb);
gpr_mu_lock (&socket->state_mu);
if (info->has_pending_iocp)
{
run_now = 1;
info->has_pending_iocp = 0;
}
else
{
info->cb = cb;
info->opaque = opaque;
}
gpr_mu_unlock (&socket->state_mu);
if (run_now)
cb (opaque, 1);
}
void
grpc_socket_notify_on_write (grpc_winsocket * socket, void (*cb) (void *, int), void *opaque)
{
socket_notify_on_iocp (socket, cb, opaque, &socket->write_info);
}
void
grpc_socket_notify_on_read (grpc_winsocket * socket, void (*cb) (void *, int), void *opaque)
{
socket_notify_on_iocp (socket, cb, opaque, &socket->read_info);
}
#endif /* GPR_WINSOCK_SOCKET */
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