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
|
/* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include "vio_priv.h"
#ifdef _WIN32
/*
Disable posting IO completion event to the port.
In some cases (synchronous timed IO) we want to skip IOCP notifications.
*/
static void disable_iocp_notification(OVERLAPPED *overlapped)
{
HANDLE *handle = &(overlapped->hEvent);
*handle = ((HANDLE)((ULONG_PTR) *handle|1));
}
/* Enable posting IO completion event to the port */
static void enable_iocp_notification(OVERLAPPED *overlapped)
{
HANDLE *handle = &(overlapped->hEvent);
*handle = (HANDLE)((ULONG_PTR) *handle & ~1);
}
static size_t wait_overlapped_result(Vio *vio, int timeout)
{
size_t ret= (size_t) -1;
DWORD transferred, wait_status, timeout_ms;
timeout_ms= timeout >= 0 ? timeout : INFINITE;
/* Wait for the overlapped operation to be completed. */
wait_status= WaitForSingleObject(vio->overlapped.hEvent, timeout_ms);
/* The operation might have completed, attempt to retrieve the result. */
if (wait_status == WAIT_OBJECT_0)
{
/* If retrieval fails, a error code will have been set. */
if (GetOverlappedResult(vio->hPipe, &vio->overlapped, &transferred, FALSE))
ret= transferred;
}
else
{
/* Error or timeout, cancel the pending I/O operation. */
CancelIo(vio->hPipe);
/*
If the wait timed out, set error code to indicate a
timeout error. Otherwise, wait_status is WAIT_FAILED
and extended error information was already set.
*/
if (wait_status == WAIT_TIMEOUT)
SetLastError(SOCKET_ETIMEDOUT);
}
return ret;
}
size_t vio_read_pipe(Vio *vio, uchar *buf, size_t count)
{
DWORD transferred;
size_t ret= (size_t) -1;
DBUG_ENTER("vio_read_pipe");
if (vio->shutdown_flag)
return ret;
disable_iocp_notification(&vio->overlapped);
/* Attempt to read from the pipe (overlapped I/O). */
if (ReadFile(vio->hPipe, buf, (DWORD)count, &transferred, &vio->overlapped))
{
/* The operation completed immediately. */
ret= transferred;
}
/* Read operation is pending completion asynchronously? */
else if (GetLastError() == ERROR_IO_PENDING)
{
if (vio->shutdown_flag)
CancelIo(vio->hPipe);
ret= wait_overlapped_result(vio, vio->read_timeout);
}
enable_iocp_notification(&vio->overlapped);
DBUG_RETURN(ret);
}
size_t vio_write_pipe(Vio *vio, const uchar *buf, size_t count)
{
DWORD transferred;
size_t ret= (size_t) -1;
DBUG_ENTER("vio_write_pipe");
if (vio->shutdown_flag == SHUT_RDWR)
return ret;
disable_iocp_notification(&vio->overlapped);
/* Attempt to write to the pipe (overlapped I/O). */
if (WriteFile(vio->hPipe, buf, (DWORD)count, &transferred, &vio->overlapped))
{
/* The operation completed immediately. */
ret= transferred;
}
/* Write operation is pending completion asynchronously? */
else if (GetLastError() == ERROR_IO_PENDING)
{
if (vio->shutdown_flag == SHUT_RDWR)
CancelIo(vio->hPipe);
ret= wait_overlapped_result(vio, vio->write_timeout);
}
enable_iocp_notification(&vio->overlapped);
DBUG_RETURN(ret);
}
my_bool vio_is_connected_pipe(Vio *vio)
{
if (PeekNamedPipe(vio->hPipe, NULL, 0, NULL, NULL, NULL))
return TRUE;
else
return (GetLastError() != ERROR_BROKEN_PIPE);
}
int vio_close_pipe(Vio *vio)
{
BOOL ret;
DBUG_ENTER("vio_close_pipe");
CloseHandle(vio->overlapped.hEvent);
ret= CloseHandle(vio->hPipe);
vio->type= VIO_CLOSED;
vio->hPipe= NULL;
vio->mysql_socket= MYSQL_INVALID_SOCKET;
DBUG_RETURN(ret);
}
/* return number of bytes readable from pipe.*/
uint vio_pending_pipe(Vio *vio)
{
DWORD bytes;
return PeekNamedPipe(vio->hPipe, NULL, 0, NULL, &bytes, NULL) ? bytes : 0;
}
#endif
|
