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/*
*
* Copyright 2015-2016, 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/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/log_win32.h>
#include <grpc/support/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(gpr_timespec deadline,
gpr_timespec now) {
gpr_timespec timeout;
static const int64_t max_spin_polling_us = 10;
if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) {
return INFINITE;
}
if (gpr_time_cmp(deadline, gpr_time_add(now, gpr_time_from_micros(
max_spin_polling_us,
GPR_TIMESPAN))) <= 0) {
return 0;
}
timeout = gpr_time_sub(deadline, now);
return (DWORD)gpr_time_to_millis(gpr_time_add(
timeout, gpr_time_from_nanos(GPR_NS_PER_MS - 1, GPR_TIMESPAN)));
}
grpc_iocp_work_status grpc_iocp_work(grpc_exec_ctx *exec_ctx,
gpr_timespec deadline) {
BOOL success;
DWORD bytes = 0;
DWORD flags = 0;
ULONG_PTR completion_key;
LPOVERLAPPED overlapped;
grpc_winsocket *socket;
grpc_winsocket_callback_info *info;
grpc_closure *closure = NULL;
success = GetQueuedCompletionStatus(
g_iocp, &bytes, &completion_key, &overlapped,
deadline_to_millis_timeout(deadline, gpr_now(deadline.clock_type)));
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 {
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->closure) {
closure = info->closure;
info->closure = NULL;
} else {
info->has_pending_iocp = 1;
}
gpr_mu_unlock(&socket->state_mu);
grpc_exec_ctx_enqueue(exec_ctx, closure, true, NULL);
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_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_iocp_work_status work_status;
do {
work_status = grpc_iocp_work(&exec_ctx, gpr_inf_past(GPR_CLOCK_MONOTONIC));
} while (work_status == GRPC_IOCP_WORK_KICK ||
grpc_exec_ctx_flush(&exec_ctx));
}
void grpc_iocp_shutdown(void) {
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
while (gpr_atm_acq_load(&g_custom_events)) {
grpc_iocp_work(&exec_ctx, gpr_inf_future(GPR_CLOCK_MONOTONIC));
grpc_exec_ctx_flush(&exec_ctx);
}
grpc_exec_ctx_finish(&exec_ctx);
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);
}
/* 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_exec_ctx *exec_ctx,
grpc_winsocket *socket, grpc_closure *closure,
grpc_winsocket_callback_info *info) {
GPR_ASSERT(info->closure == NULL);
gpr_mu_lock(&socket->state_mu);
if (info->has_pending_iocp) {
info->has_pending_iocp = 0;
grpc_exec_ctx_enqueue(exec_ctx, closure, true, NULL);
} else {
info->closure = closure;
}
gpr_mu_unlock(&socket->state_mu);
}
void grpc_socket_notify_on_write(grpc_exec_ctx *exec_ctx,
grpc_winsocket *socket,
grpc_closure *closure) {
socket_notify_on_iocp(exec_ctx, socket, closure, &socket->write_info);
}
void grpc_socket_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_winsocket *socket,
grpc_closure *closure) {
socket_notify_on_iocp(exec_ctx, socket, closure, &socket->read_info);
}
#endif /* GPR_WINSOCK_SOCKET */
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