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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_WINSOCK_SOCKET
#include <winsock2.h>
#include <limits>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/log_windows.h>
#include "src/core/lib/debug/stats.h"
#include "src/core/lib/gpr/thd.h"
#include "src/core/lib/iomgr/iocp_windows.h"
#include "src/core/lib/iomgr/iomgr_internal.h"
#include "src/core/lib/iomgr/socket_windows.h"
#include "src/core/lib/iomgr/timer.h"
static ULONG g_iocp_kick_token;
static OVERLAPPED g_iocp_custom_overlap;
static gpr_atm g_custom_events = 0;
static HANDLE g_iocp;
static DWORD deadline_to_millis_timeout(grpc_millis deadline) {
if (deadline == GRPC_MILLIS_INF_FUTURE) {
return INFINITE;
}
grpc_millis now = grpc_core::ExecCtx::Get()->Now();
if (deadline < now) return 0;
grpc_millis timeout = deadline - now;
if (timeout > std::numeric_limits<DWORD>::max()) return INFINITE;
return static_cast<DWORD>(deadline - now);
}
grpc_iocp_work_status grpc_iocp_work(grpc_millis deadline) {
BOOL success;
DWORD bytes = 0;
DWORD flags = 0;
ULONG_PTR completion_key;
LPOVERLAPPED overlapped;
grpc_winsocket* socket;
grpc_winsocket_callback_info* info;
GRPC_STATS_INC_SYSCALL_POLL();
success =
GetQueuedCompletionStatus(g_iocp, &bytes, &completion_key, &overlapped,
deadline_to_millis_timeout(deadline));
grpc_core::ExecCtx::Get()->InvalidateNow();
if (success == 0 && overlapped == NULL) {
return GRPC_IOCP_WORK_TIMEOUT;
}
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 GRPC_IOCP_WORK_KICK;
}
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 {
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);
grpc_socket_become_ready(socket, info);
return GRPC_IOCP_WORK_WORK;
}
void grpc_iocp_init(void) {
g_iocp =
CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, (ULONG_PTR)NULL, 0);
GPR_ASSERT(g_iocp);
}
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_flush(void) {
grpc_core::ExecCtx exec_ctx;
grpc_iocp_work_status work_status;
do {
work_status = grpc_iocp_work(GRPC_MILLIS_INF_PAST);
} while (work_status == GRPC_IOCP_WORK_KICK ||
grpc_core::ExecCtx::Get()->Flush());
}
void grpc_iocp_shutdown(void) {
grpc_core::ExecCtx exec_ctx;
while (gpr_atm_acq_load(&g_custom_events)) {
grpc_iocp_work(GRPC_MILLIS_INF_FUTURE);
grpc_core::ExecCtx::Get()->Flush();
}
GPR_ASSERT(CloseHandle(g_iocp));
}
void grpc_iocp_add_socket(grpc_winsocket* socket) {
HANDLE ret;
if (socket->added_to_iocp) return;
ret = CreateIoCompletionPort((HANDLE)socket->socket, g_iocp,
(uintptr_t)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);
}
#endif /* GRPC_WINSOCK_SOCKET */
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