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
|
/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Event_Handler.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#ifndef ACE_EVENT_HANDLER_H
#define ACE_EVENT_HANDLER_H
#include "ace/ACE.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
// Forward declaration.
class ACE_Message_Block;
class ACE_Reactor;
class ACE_Thread_Manager;
typedef u_long ACE_Reactor_Mask;
class ACE_Export ACE_Event_Handler
{
// = TITLE
// Provides an abstract interface for handling various types of
// I/O, timer, and signal events.
//
// = DESCRIPTION
// Subclasses read/write input/output on an I/O descriptor,
// handle an exception raised on an I/O descriptor, handle a
// timer's expiration, or handle a signal.
public:
enum
{
LO_PRIORITY = 0,
HI_PRIORITY = 10,
NULL_MASK = 0,
#if defined (ACE_USE_POLL)
READ_MASK = POLLIN,
WRITE_MASK = POLLOUT,
EXCEPT_MASK = POLLPRI,
#else /* USE SELECT */
READ_MASK = (1 << 0),
WRITE_MASK = (1 << 1),
EXCEPT_MASK = (1 << 2),
#endif /* ACE_USE_POLL */
ACCEPT_MASK = (1 << 3),
CONNECT_MASK = (1 << 4),
TIMER_MASK = (1 << 5),
QOS_MASK = (1 << 6),
GROUP_QOS_MASK = (1 << 7),
ALL_EVENTS_MASK = READ_MASK |
WRITE_MASK |
EXCEPT_MASK |
ACCEPT_MASK |
CONNECT_MASK |
TIMER_MASK |
QOS_MASK |
GROUP_QOS_MASK,
RWE_MASK = READ_MASK |
WRITE_MASK |
EXCEPT_MASK,
DONT_CALL = (1 << 9)
};
virtual ~ACE_Event_Handler (void);
// Destructor is virtual to enable proper cleanup.
virtual ACE_HANDLE get_handle (void) const;
// Get the I/O handle.
virtual void set_handle (ACE_HANDLE);
// Set the I/O handle.
// = Get/set priority
// Priorities run from MIN_PRIORITY (which is the "lowest priority")
// to MAX_PRIORITY (which is the "highest priority").
virtual int priority (void) const;
// Get the priority of the Event_Handler.
virtual void priority (int priority);
// Set the priority of the Event_Handler.
virtual int handle_input (ACE_HANDLE fd = ACE_INVALID_HANDLE);
// Called when input events occur (e.g., connection or data).
virtual int handle_output (ACE_HANDLE fd = ACE_INVALID_HANDLE);
// Called when output events are possible (e.g., flow control
// abates).
virtual int handle_exception (ACE_HANDLE fd = ACE_INVALID_HANDLE);
// Called when execption events occur (e.g., SIGURG).
virtual int handle_timeout (const ACE_Time_Value &tv,
const void *arg = 0);
// Called when timer expires.
virtual int handle_close (ACE_HANDLE handle,
ACE_Reactor_Mask close_mask);
// Called when object is removed from the ACE_Reactor
virtual int handle_signal (int signum, siginfo_t * = 0, ucontext_t * = 0);
// Called when object is signaled by OS (either via UNIX signals or
// when a Win32 object becomes signaled).
virtual int handle_qos (ACE_HANDLE = ACE_INVALID_HANDLE);
virtual int handle_group_qos (ACE_HANDLE = ACE_INVALID_HANDLE);
// = Accessors to set/get the various event demultiplexors.
virtual void reactor (ACE_Reactor *reactor);
virtual ACE_Reactor *reactor (void) const;
#if !defined (ACE_HAS_WINCE)
static void *read_adapter (void *event_handler);
// Used to read from non-socket ACE_HANDLEs in our own thread to
// work around Win32 limitations that don't allow us to select() on
// non-sockets (such as ACE_STDIN). This is commonly used in
// situations where the Reactor is used to demultiplex read events
// on ACE_STDIN on UNIX. Note that <event_handler> must be a
// subclass of <ACE_Event_Handler>. If the <get_handle> method of
// this event handler returns <ACE_INVALID_HANDLE> we default to
// reading from ACE_STDIN.
static int register_stdin_handler (ACE_Event_Handler *eh,
ACE_Reactor *reactor,
ACE_Thread_Manager *thr_mgr,
int flags = THR_DETACHED);
// Abstracts away from the differences between Win32 and ACE with
// respect to reading from ACE_STDIN (which is non-select()'able on
// Win32.
static int remove_stdin_handler (ACE_Reactor *reactor,
ACE_Thread_Manager *thr_mgr);
// Performs the inverse of the <register_stdin_handler> method.
#endif /* ACE_HAS_WINCE */
protected:
ACE_Event_Handler (void);
// Force ACE_Event_Handler to be an abstract base class.
int priority_;
// Priority of this Event_Handler.
// = Pointers to the various event demultiplexors.
ACE_Reactor *reactor_;
};
class ACE_Export ACE_Notification_Buffer
{
// = TITLE
// Simple wrapper for passing <ACE_Event_Handler *>s and
// <ACE_Reactor_Mask>s between threads.
public:
ACE_Notification_Buffer (void);
ACE_Notification_Buffer (ACE_Event_Handler *eh,
ACE_Reactor_Mask mask);
~ACE_Notification_Buffer (void);
// Default dtor.
ACE_Event_Handler *eh_;
// Pointer to the Event_Handler that will be dispatched
// by the main event loop.
ACE_Reactor_Mask mask_;
// Mask that indicates which method to call.
};
#if defined (__ACE_INLINE__)
#include "ace/Event_Handler.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_EVENT_HANDLER_H */
|
