DebugClients/Python3/DebugClientThreads.py

Sun, 29 Apr 2012 16:50:49 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sun, 29 Apr 2012 16:50:49 +0200
changeset 1820
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parent 1509
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child 2302
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permissions
-rw-r--r--

Change to notes in the source code because they were no tasks.

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2009 - 2012 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing the multithreaded version of the debug client.
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8 """
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9
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10 import _thread
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11 import sys
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12
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13 from AsyncIO import AsyncIO
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14 from DebugThread import DebugThread
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15 import DebugClientBase
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16
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18 def _debugclient_start_new_thread(target, args, kwargs={}):
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19 """
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20 Module function used to allow for debugging of multiple threads.
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21
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22 The way it works is that below, we reset _thread._start_new_thread to
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23 this function object. Thus, providing a hook for us to see when
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24 threads are started. From here we forward the request onto the
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25 DebugClient which will create a DebugThread object to allow tracing
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26 of the thread then start up the thread. These actions are always
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27 performed in order to allow dropping into debug mode.
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28
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29 See DebugClientThreads.attachThread and DebugThread.DebugThread in
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30 DebugThread.py
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31
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32 @param target the start function of the target thread (i.e. the user code)
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33 @param args arguments to pass to target
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34 @param kwargs keyword arguments to pass to target
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35 @return The identifier of the created thread
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36 """
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37 if DebugClientBase.DebugClientInstance is not None:
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38 return DebugClientBase.DebugClientInstance.attachThread(target, args, kwargs)
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39 else:
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40 return _original_start_thread(target, args, kwargs)
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41
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42 # make _thread hooks available to system
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43 _original_start_thread = _thread.start_new_thread
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44 _thread.start_new_thread = _debugclient_start_new_thread
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45
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46 # Note: import threading here AFTER above hook, as threading cache's
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47 # thread._start_new_thread.
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48 from threading import RLock
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49
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50
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51 class DebugClientThreads(DebugClientBase.DebugClientBase, AsyncIO):
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52 """
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53 Class implementing the client side of the debugger.
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54
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55 This variant of the debugger implements a threaded debugger client
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56 by subclassing all relevant base classes.
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57 """
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58 def __init__(self):
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59 """
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60 Constructor
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61 """
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62 AsyncIO.__init__(self)
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63
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64 DebugClientBase.DebugClientBase.__init__(self)
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65
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66 # protection lock for synchronization
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67 self.clientLock = RLock()
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68
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69 # the "current" thread, basically the thread we are at a breakpoint for.
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70 self.currentThread = None
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71
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72 # special objects representing the main scripts thread and frame
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73 self.mainThread = None
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74 self.mainFrame = None
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75
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76 self.variant = 'Threaded'
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77
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78 def attachThread(self, target=None, args=None, kwargs=None, mainThread=False):
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79 """
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80 Public method to setup a thread for DebugClient to debug.
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81
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82 If mainThread is non-zero, then we are attaching to the already
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83 started mainthread of the app and the rest of the args are ignored.
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84
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85 @param target the start function of the target thread (i.e. the user code)
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86 @param args arguments to pass to target
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87 @param kwargs keyword arguments to pass to target
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88 @param mainThread True, if we are attaching to the already
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89 started mainthread of the app
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90 @return identifier of the created thread
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91 """
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92 try:
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93 self.lockClient()
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94 newThread = DebugThread(self, target, args, kwargs, mainThread)
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95 ident = -1
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96 if mainThread:
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97 ident = _thread.get_ident()
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98 self.mainThread = newThread
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99 if self.debugging:
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100 sys.setprofile(newThread.profile)
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101 else:
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102 ident = _original_start_thread(newThread.bootstrap, ())
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103 newThread.set_ident(ident)
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104 self.threads[newThread.get_ident()] = newThread
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105 finally:
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106 self.unlockClient()
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107 return ident
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108
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109 def threadTerminated(self, dbgThread):
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110 """
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111 Public method called when a DebugThread has exited.
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112
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113 @param dbgThread the DebugThread that has exited
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114 """
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115 self.lockClient()
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116 try:
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117 del self.threads[dbgThread.get_ident()]
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118 except KeyError:
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119 pass
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120 finally:
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121 self.unlockClient()
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122
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123 def lockClient(self, blocking=True):
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124 """
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125 Public method to acquire the lock for this client.
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126
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127 @param blocking flag to indicating a blocking lock
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128 @return flag indicating successful locking
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129 """
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130 if blocking:
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131 self.clientLock.acquire()
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132 else:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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133 return self.clientLock.acquire(blocking)
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parents:
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134
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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135 def unlockClient(self):
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parents:
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136 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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137 Public method to release the lock for this client.
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parents:
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138 """
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parents:
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139 try:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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140 self.clientLock.release()
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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141 except AssertionError:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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142 pass
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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143
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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144 def setCurrentThread(self, id):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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145 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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146 Private method to set the current thread.
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parents:
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147
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parents:
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148 @param id the id the current thread should be set to.
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parents:
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149 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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150 try:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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151 self.lockClient()
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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152 if id is None:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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153 self.currentThread = None
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parents:
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154 else:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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155 self.currentThread = self.threads[id]
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parents:
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156 finally:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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157 self.unlockClient()
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parents:
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158
945
8cd4d08fa9f6 Made code mostly PEP 8 compliant (except all whitespace and line length).
Detlev Offenbach <detlev@die-offenbachs.de>
parents: 791
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159 def eventLoop(self, disablePolling=False):
0
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parents:
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160 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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161 Public method implementing our event loop.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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162
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parents:
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163 @param disablePolling flag indicating to enter an event loop with
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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164 polling disabled (boolean)
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parents:
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165 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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166 # make sure we set the current thread appropriately
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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167 threadid = _thread.get_ident()
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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168 self.setCurrentThread(threadid)
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parents:
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169
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parents:
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170 DebugClientBase.DebugClientBase.eventLoop(self, disablePolling)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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171
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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172 self.setCurrentThread(None)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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173
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
174 def set_quit(self):
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
175 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
176 Private method to do a 'set quit' on all threads.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
177 """
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
178 try:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
179 locked = self.lockClient(False)
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
180 try:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
181 for key in self.threads:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
182 self.threads[key].set_quit()
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
183 except:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
184 pass
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
185 finally:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
186 if locked:
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
187 self.unlockClient()
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
188
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
189 # We are normally called by the debugger to execute directly.
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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190
de9c2efb9d02 Started porting eric4 to Python3
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
191 if __name__ == '__main__':
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff changeset
192 debugClient = DebugClientThreads()
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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193 debugClient.main()

eric ide

mercurial