1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
*
* 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/log.h>
#include <grpc/support/log_win32.h>
#include <grpc/support/alloc.h>
#include <grpc/support/thd.h>
#include "src/core/iomgr/timer.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_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 */
|
