Mercurial > cpython-lru_cache-weakref

annotate Demo/threads/Coroutine.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents f2901b6ac5ed
children 71a294bd7950
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Coroutine implementation using Python threads.
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2 #
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3 # Combines ideas from Guido's Generator module, and from the coroutine
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4 # features of Icon and Simula 67.
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5 #
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6 # To run a collection of functions as coroutines, you need to create
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7 # a Coroutine object to control them:
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8 # co = Coroutine()
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9 # and then 'create' a subsidiary object for each function in the
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10 # collection:
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11 # cof1 = co.create(f1 [, arg1, arg2, ...]) # [] means optional,
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12 # cof2 = co.create(f2 [, arg1, arg2, ...]) #... not list
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13 # cof3 = co.create(f3 [, arg1, arg2, ...])
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14 # etc. The functions need not be distinct; 'create'ing the same
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15 # function multiple times gives you independent instances of the
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16 # function.
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17 #
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18 # To start the coroutines running, use co.tran on one of the create'd
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19 # functions; e.g., co.tran(cof2). The routine that first executes
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20 # co.tran is called the "main coroutine". It's special in several
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21 # respects: it existed before you created the Coroutine object; if any of
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22 # the create'd coroutines exits (does a return, or suffers an unhandled
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23 # exception), EarlyExit error is raised in the main coroutine; and the
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24 # co.detach() method transfers control directly to the main coroutine
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25 # (you can't use co.tran() for this because the main coroutine doesn't
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26 # have a name ...).
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27 #
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28 # Coroutine objects support these methods:
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29 #
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30 # handle = .create(func [, arg1, arg2, ...])
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31 # Creates a coroutine for an invocation of func(arg1, arg2, ...),
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32 # and returns a handle ("name") for the coroutine so created. The
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33 # handle can be used as the target in a subsequent .tran().
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34 #
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35 # .tran(target, data=None)
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36 # Transfer control to the create'd coroutine "target", optionally
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37 # passing it an arbitrary piece of data. To the coroutine A that does
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38 # the .tran, .tran acts like an ordinary function call: another
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39 # coroutine B can .tran back to it later, and if it does A's .tran
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40 # returns the 'data' argument passed to B's tran. E.g.,
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41 #
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42 # in coroutine coA in coroutine coC in coroutine coB
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43 # x = co.tran(coC) co.tran(coB) co.tran(coA,12)
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44 # print x # 12
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45 #
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46 # The data-passing feature is taken from Icon, and greatly cuts
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47 # the need to use global variables for inter-coroutine communication.
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48 #
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49 # .back( data=None )
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50 # The same as .tran(invoker, data=None), where 'invoker' is the
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51 # coroutine that most recently .tran'ed control to the coroutine
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52 # doing the .back. This is akin to Icon's "&source".
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53 #
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54 # .detach( data=None )
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55 # The same as .tran(main, data=None), where 'main' is the
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56 # (unnameable!) coroutine that started it all. 'main' has all the
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57 # rights of any other coroutine: upon receiving control, it can
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58 # .tran to an arbitrary coroutine of its choosing, go .back to
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59 # the .detach'er, or .kill the whole thing.
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60 #
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61 # .kill()
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62 # Destroy all the coroutines, and return control to the main
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63 # coroutine. None of the create'ed coroutines can be resumed after a
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64 # .kill(). An EarlyExit exception does a .kill() automatically. It's
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65 # a good idea to .kill() coroutines you're done with, since the
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66 # current implementation consumes a thread for each coroutine that
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67 # may be resumed.
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68
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69 import thread
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70 import sync
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71
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72 class _CoEvent:
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73 def __init__(self, func):
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74 self.f = func
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75 self.e = sync.event()
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76
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77 def __repr__(self):
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78 if self.f is None:
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79 return 'main coroutine'
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80 else:
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81 return 'coroutine for func ' + self.f.func_name
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82
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83 def __hash__(self):
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84 return id(self)
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85
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86 def __cmp__(x,y):
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87 return cmp(id(x), id(y))
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88
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89 def resume(self):
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90 self.e.post()
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91
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92 def wait(self):
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93 self.e.wait()
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94 self.e.clear()
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95
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96 Killed = 'Coroutine.Killed'
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97 EarlyExit = 'Coroutine.EarlyExit'
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98
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99 class Coroutine:
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100 def __init__(self):
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101 self.active = self.main = _CoEvent(None)
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102 self.invokedby = {self.main: None}
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103 self.killed = 0
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104 self.value = None
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105 self.terminated_by = None
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106
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107 def create(self, func, *args):
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108 me = _CoEvent(func)
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109 self.invokedby[me] = None
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110 thread.start_new_thread(self._start, (me,) + args)
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111 return me
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112
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113 def _start(self, me, *args):
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114 me.wait()
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115 if not self.killed:
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116 try:
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117 try:
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118 apply(me.f, args)
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119 except Killed:
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120 pass
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121 finally:
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122 if not self.killed:
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123 self.terminated_by = me
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124 self.kill()
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125
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126 def kill(self):
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127 if self.killed:
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128 raise TypeError, 'kill() called on dead coroutines'
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129 self.killed = 1
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130 for coroutine in self.invokedby.keys():
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131 coroutine.resume()
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132
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133 def back(self, data=None):
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134 return self.tran( self.invokedby[self.active], data )
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135
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136 def detach(self, data=None):
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137 return self.tran( self.main, data )
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138
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139 def tran(self, target, data=None):
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140 if not self.invokedby.has_key(target):
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141 raise TypeError, '.tran target ' + `target` + \
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142 ' is not an active coroutine'
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143 if self.killed:
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144 raise TypeError, '.tran target ' + `target` + ' is killed'
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145 self.value = data
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Guido van Rossum <guido@python.org>
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146 me = self.active
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147 self.invokedby[target] = me
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148 self.active = target
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Guido van Rossum <guido@python.org>
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149 target.resume()
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Guido van Rossum <guido@python.org>
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150
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Guido van Rossum <guido@python.org>
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151 me.wait()
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152 if self.killed:
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153 if self.main is not me:
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154 raise Killed
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Guido van Rossum <guido@python.org>
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155 if self.terminated_by is not None:
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156 raise EarlyExit, `self.terminated_by` + ' terminated early'
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Guido van Rossum <guido@python.org>
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157
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Guido van Rossum <guido@python.org>
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158 return self.value
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Guido van Rossum <guido@python.org>
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159
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Guido van Rossum <guido@python.org>
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160 # end of module