root/trunk/dep/src/zthread/State.h @ 2

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Original author: Neo2003
Date: 2008-10-02 16:23:55-05:00
Line 
1/*
2 * Copyright (c) 2005, Eric Crahen
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is furnished
9 * to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in all
12 * copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
18 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 *
21 */
22
23#ifndef __ZTSTATE_H__
24#define __ZTSTATE_H__
25
26namespace ZThread {
27
28/**
29 * @class State
30 * @author Eric Crahen <http://www.code-foo.com>
31 * @date <2003-07-16T20:04:01-0400>
32 * @version 2.2.1
33 *
34 * Class to encapsulate the current state of the threads life-cycle.
35 */
36class State {
37 public:
38
39  //! Various states
40  typedef enum { REFERENCE, IDLE, RUNNING, JOINED } STATE;
41
42  /**
43   * Create State with the given flag set.
44   */
45  State(STATE initialState) : _state(initialState) {}
46
47  /**
48   * Test for the IDLE state. No task has yet run.
49   */
50  bool isIdle() const {
51    return _state == IDLE;
52  }
53
54  /**
55   * Test for the JOINED state. A task has completed and
56   * the thread is join()ed.
57   *
58   * @return bool
59   */
60  bool isJoined() const {
61    return _state == JOINED;
62  }
63
64  /**
65   * Test for the RUNNING state. A task is in progress.
66   *
67   * @return bool
68   */
69  bool isRunning() const {
70    return _state == RUNNING;
71  }
72
73  /**
74   * Test for the REFERENCE state. A task is in progress but not
75   * under control of this library.
76   *
77   * @return bool
78   */
79  bool isReference() const {
80    return _state == REFERENCE;
81  }
82
83  /**
84   * Transition to the IDLE state.
85   *
86   * @return bool true if successful
87   */
88  bool setIdle() {
89
90    if(_state != RUNNING)
91      return false;
92
93    _state = IDLE;
94    return true;
95
96  }
97
98  /**
99   * Transition to the RUNNING state.
100   *
101   * @return bool true if successful
102   */
103  bool setRunning() {
104
105    if(_state != IDLE)
106      return false;
107
108    _state = RUNNING;
109    return true;
110
111  }
112
113  /**
114   * Transition to the REFERENCE state.
115   *
116   * @return bool true if successful
117   */
118  bool setReference() {
119
120    if(_state != IDLE)
121      return false;
122
123    _state = REFERENCE;
124    return true;
125
126  }
127
128
129  /**
130   * Transition to the JOINED state.
131   *
132   * @return bool true if successful
133   */
134  bool setJoined() {
135
136    _state = JOINED;
137    return true;
138
139  }
140
141 private:
142
143  //! Current state
144  STATE _state;
145
146};
147
148
149};
150
151#endif
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