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
209
|
/* -*- C++ -*- */
// $Id$
/*
// ============================================================================
//
// = LIBRARY
// ACE
//
// = FILENAME
// CLASSIX_Reactor.h
//
// = AUTHOR(S)
// Nokia Telecommunications
//
// ============================================================================
*/
#ifndef ACE_CLASSIX_REACTOR_H
#include "ace/pre.h"
#define ACE_CLASSIX_REACTOR_H
/* ------------------------------------------------------------------------- */
#include "ace/Timer_Queue.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Select_Reactor.h"
#include "ace/Message_Block.h"
#include "ace/CLASSIX/CLASSIX_SAP.h"
class ACE_CLASSIX_Select_Reactor;
class ACE_Export ACE_CLASSIX_Select_Reactor_Notify :
public ACE_Reactor_Notify
{
// = TITLE
// Unblock the <ACE_CLASSIX_Select_Reactor> from its event loop.
//
// = DESCRIPTION
// This replaces <ACE_Select_Reactor_Notify> class.
// Instead of using pipe, this class uses an Chorus IPC port to
// trigger the unblock event.
//
public:
// = Initialization and termination methods.
ACE_CLASSIX_Select_Reactor_Notify(void);
~ACE_CLASSIX_Select_Reactor_Notify(void);
virtual int open (ACE_Reactor_Impl *,
ACE_Timer_Queue * = 0,
int = 0 /* dusable_notify_pip */);
// Enables the notification port and register it with the reactor
virtual int close (void);
// Disables the notification port
int dispatch_notifications (int &number_of_active_handles,
const ACE_Handle_Set &rd_mask);
// Handles pending threads (if any) that are waiting to unblock the
// Select_Reactor.
ssize_t notify (ACE_Event_Handler * = 0,
ACE_Reactor_Mask = ACE_Event_Handler::EXCEPT_MASK,
ACE_Time_Value * = 0);
// Called by a thread when it wants to unblock the Select_Reactor.
// This wakeups the <ACE_Select_Reactor> if currently blocked in
// select()/poll(). Pass over both the <Event_Handler> *and* the
// <mask> to allow the caller to dictate which <Event_Handler>
// method the <Select_Reactor> will invoke. The <ACE_Time_Value>
// indicates how long to blocking trying to notify the
// <Select_Reactor>. If <timeout> == 0, the caller will block until
// action is possible, else will wait until the relative time
// specified in *<timeout> elapses).
virtual int handle_input (ACE_HANDLE handle);
// Called back by the Select_Reactor when a thread wants to unblock us.
virtual void max_notify_iterations (int);
// Set the maximum number of times that the
// <ACE_CLASSIX_Reactor_Notify::handle_input> method will iterate
// Always 1.
virtual int max_notify_iterations (void);
// Get the maximum number of times that the
// <ACE_Select_Reactor_Notify::handle_input> method will iterate.
// Always 1
void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
ACE_CLASSIX_Select_Reactor *select_reactor_;
// Keep a back pointer to the <ACE_Select_Reactor>. If this value
// if NULL then the <ACE_Select_Reactor> has been initialized with
// <disable_notify_pipe>.
ACE_CLASSIX_Port_Core notification_port_; // CLASSIX' IPC port
ACE_CLASSIX_SAP notification_sap_;
// The HANDLE that the Select_Reactor is listening on and
// the HANDLE that threads wanting the attention of the
// Select_Reactor will write t are the same.
// It can be seen that the notification port is implicitly connected to the
// port from where the notification is written. In many cases, it will be
// the actor's default port.
};
class ACE_CLASSIX_Select_Reactor : public ACE_Select_Reactor
// = TITLE
// Implementing a Reactor for monitoring incoming data
//
// = DESCRIPTION
// This class redefines the wait_for_events() method of
// <ACE_Select_Reactor> class.
//
// The wait_for_events() method uses ipcReceive() to monitor
// all ENABLED ports for incoming messages. The ipcReceive() is
// set up such that it will find out the size of the message but will
// not read the message. The Chorus OS provides an ipcGetData()
// to read the message that has just been detected on the same
// thread.
// Once a message is detected on a particular
// port, the reactor will invoke the port handler's
// handle_input() method on the same thread. It is important that
// handle_input() shall immediately retrieve(use ipcGetData())
// the message on the same
// thread and it shall not hold up this thread in the handle_input()
// routine for too long. This will allow the Reactor to respond to
// events more quickly.
//
// = NOTE
// Since chorus does not allow ipcReceive to monitor a subset of
// ENABLED ports. One cannot have two ACE_CLASSIX_Select_Reactors
// in one actor.
//
{
public:
// = CURRENT MESSAGE
// The following message should be called in the handler's
// handle_input() routine.
// The handle_input() routine should not hold the reactor for too long.
virtual int current_info(ACE_HANDLE /* port */,
size_t& /* msg size */);
// Retruns the current messageage to the caleer if the supplied
// handle id is the same as the <current_handle_>
// Returns 0, if <msg size> constains the size of the message
// that the handler shall read.
// Returns -1, if the caller is not the expected handler.
protected:
// = INITIALIZATION
ACE_CLASSIX_Select_Reactor (ACE_Timer_Queue * = 0);
// Initializes <ACE_CLASSIX_Select__Reactor> with the handler
// repository of the default size.
ACE_CLASSIX_Select_Reactor (size_t size,
int restart = 0,
ACE_Timer_Queue * = 0);
// Initializes <ACE_CLASSIX_Select_Reactor> with the handler repository of
// size <size>.
// multiplexer
virtual int wait_for_multiple_events (ACE_Select_Reactor_Handle_Set &,
ACE_Time_Value *);
// Wait for events to occur.
virtual int set_current_info_(ACE_HANDLE /* handle */,
size_t /* size of data */);
// record the handler and the size of the message that the handler shall
// read next.
// ACE_Recursive_Thread_Mutex lock_current_;
// lock for data relating to the current message.
// use token lock
size_t current_msg_size_;
// size of the message that has just been detected.
ACE_HANDLE current_handle_;
// handler id of the current address.
friend class ACE_CLASSIX_Select_Reactor_Notify;
friend class ACE_CLASSIX_OS;
// for constructors
private:
int handle_error_(int /* port handle */);
// Takes corrective action when errors occur.
int check_handles_(int /* port handle */);
// Makes sure the handler is valid.
ACE_CLASSIX_Select_Reactor(ACE_CLASSIX_Select_Reactor const&);
ACE_CLASSIX_Select_Reactor const& operator=(ACE_CLASSIX_Select_Reactor const&);
};
/* ------------------------------------------------------------------------- */
#if defined (__ACE_INLINE__)
#include "ace/CLASSIX/CLASSIX_Select_Reactor.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_CLASSIX_REACTOR_H */
|
