… | |
… | |
32 | |
32 | |
33 | =cut |
33 | =cut |
34 | |
34 | |
35 | package Coro; |
35 | package Coro; |
36 | |
36 | |
|
|
37 | no warnings qw(uninitialized); |
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38 | |
37 | use Coro::State; |
39 | use Coro::State; |
38 | |
40 | |
39 | use base Exporter; |
41 | use base Exporter; |
40 | |
42 | |
41 | $VERSION = 0.10; |
43 | $VERSION = 0.51; |
42 | |
44 | |
43 | @EXPORT = qw(async cede schedule terminate current); |
45 | @EXPORT = qw(async cede schedule terminate current); |
44 | @EXPORT_OK = qw($current); |
46 | %EXPORT_TAGS = ( |
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47 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
|
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48 | ); |
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49 | @EXPORT_OK = @{$EXPORT_TAGS{prio}}; |
45 | |
50 | |
46 | { |
51 | { |
47 | my @async; |
52 | my @async; |
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53 | my $init; |
48 | |
54 | |
49 | # this way of handling attributes simply is NOT scalable ;() |
55 | # this way of handling attributes simply is NOT scalable ;() |
50 | sub import { |
56 | sub import { |
51 | Coro->export_to_level(1, @_); |
57 | Coro->export_to_level(1, @_); |
52 | my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; |
58 | my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; |
… | |
… | |
54 | my ($package, $ref) = (shift, shift); |
60 | my ($package, $ref) = (shift, shift); |
55 | my @attrs; |
61 | my @attrs; |
56 | for (@_) { |
62 | for (@_) { |
57 | if ($_ eq "Coro") { |
63 | if ($_ eq "Coro") { |
58 | push @async, $ref; |
64 | push @async, $ref; |
|
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65 | unless ($init++) { |
|
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66 | eval q{ |
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67 | sub INIT { |
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68 | &async(pop @async) while @async; |
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69 | } |
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70 | }; |
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71 | } |
59 | } else { |
72 | } else { |
60 | push @attrs, $_; |
73 | push @attrs, $_; |
61 | } |
74 | } |
62 | } |
75 | } |
63 | return $old ? $old->($package, $ref, @attrs) : @attrs; |
76 | return $old ? $old->($package, $ref, @attrs) : @attrs; |
64 | }; |
77 | }; |
65 | } |
78 | } |
66 | |
79 | |
67 | sub INIT { |
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68 | &async(pop @async) while @async; |
|
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69 | } |
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70 | } |
80 | } |
71 | |
81 | |
72 | =item $main |
82 | =item $main |
73 | |
83 | |
74 | This coroutine represents the main program. |
84 | This coroutine represents the main program. |
… | |
… | |
103 | our $idle = new Coro sub { |
113 | our $idle = new Coro sub { |
104 | print STDERR "FATAL: deadlock detected\n"; |
114 | print STDERR "FATAL: deadlock detected\n"; |
105 | exit(51); |
115 | exit(51); |
106 | }; |
116 | }; |
107 | |
117 | |
108 | # we really need priorities... |
118 | # this coroutine is necessary because a coroutine |
109 | my @ready; # the ready queue. hehe, rather broken ;) |
119 | # cannot destroy itself. |
|
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120 | my @destroy; |
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121 | my $manager; |
|
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122 | $manager = new Coro sub { |
|
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123 | while() { |
|
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124 | # by overwriting the state object with the manager we destroy it |
|
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125 | # while still being able to schedule this coroutine (in case it has |
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126 | # been readied multiple times. this is harmless since the manager |
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127 | # can be called as many times as neccessary and will always |
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128 | # remove itself from the runqueue |
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129 | while (@destroy) { |
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130 | my $coro = pop @destroy; |
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131 | $coro->{status} ||= []; |
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132 | $_->ready for @{delete $coro->{join} || []}; |
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133 | $coro->{_coro_state} = $manager->{_coro_state}; |
|
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134 | } |
|
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135 | &schedule; |
|
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136 | } |
|
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137 | }; |
110 | |
138 | |
111 | # static methods. not really. |
139 | # static methods. not really. |
112 | |
140 | |
113 | =head2 STATIC METHODS |
141 | =head2 STATIC METHODS |
114 | |
142 | |
… | |
… | |
132 | |
160 | |
133 | =cut |
161 | =cut |
134 | |
162 | |
135 | sub async(&@) { |
163 | sub async(&@) { |
136 | my $pid = new Coro @_; |
164 | my $pid = new Coro @_; |
|
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165 | $manager->ready; # this ensures that the stack is cloned from the manager |
137 | $pid->ready; |
166 | $pid->ready; |
138 | $pid; |
167 | $pid; |
139 | } |
168 | } |
140 | |
169 | |
141 | =item schedule |
170 | =item schedule |
… | |
… | |
144 | into the ready queue, so calling this function usually means you will |
173 | into the ready queue, so calling this function usually means you will |
145 | never be called again. |
174 | never be called again. |
146 | |
175 | |
147 | =cut |
176 | =cut |
148 | |
177 | |
149 | my $prev; |
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150 | |
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151 | sub schedule { |
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152 | # should be done using priorities :( |
|
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153 | ($prev, $current) = ($current, shift @ready || $idle); |
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154 | Coro::State::transfer($prev, $current); |
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155 | } |
|
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156 | |
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157 | =item cede |
178 | =item cede |
158 | |
179 | |
159 | "Cede" to other processes. This function puts the current process into the |
180 | "Cede" to other processes. This function puts the current process into the |
160 | ready queue and calls C<schedule>, which has the effect of giving up the |
181 | ready queue and calls C<schedule>, which has the effect of giving up the |
161 | current "timeslice" to other coroutines of the same or higher priority. |
182 | current "timeslice" to other coroutines of the same or higher priority. |
162 | |
183 | |
163 | =cut |
184 | =cut |
164 | |
185 | |
165 | sub cede { |
186 | =item terminate [arg...] |
|
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187 | |
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188 | Terminates the current process. |
|
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189 | |
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190 | Future versions of this function will allow result arguments. |
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191 | |
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192 | =cut |
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193 | |
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194 | sub terminate { |
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195 | $current->{status} = [@_]; |
166 | $current->ready; |
196 | $current->cancel; |
167 | &schedule; |
197 | &schedule; |
168 | } |
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169 | |
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170 | =item terminate |
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171 | |
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172 | Terminates the current process. |
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173 | |
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174 | Future versions of this function will allow result arguments. |
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175 | |
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176 | =cut |
|
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177 | |
|
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178 | # this coroutine is necessary because a coroutine |
|
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179 | # cannot destroy itself. |
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180 | my @destroy; |
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181 | my $terminate = new Coro sub { |
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182 | while() { |
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183 | delete ((pop @destroy)->{_coro_state}) while @destroy; |
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184 | &schedule; |
|
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185 | } |
|
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186 | }; |
|
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187 | |
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188 | sub terminate { |
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189 | push @destroy, $current; |
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190 | $terminate->ready; |
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191 | &schedule; |
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192 | # NORETURN |
198 | die; # NORETURN |
193 | } |
199 | } |
194 | |
200 | |
195 | =back |
201 | =back |
196 | |
202 | |
197 | # dynamic methods |
203 | # dynamic methods |
… | |
… | |
203 | =over 4 |
209 | =over 4 |
204 | |
210 | |
205 | =item new Coro \&sub [, @args...] |
211 | =item new Coro \&sub [, @args...] |
206 | |
212 | |
207 | Create a new process and return it. When the sub returns the process |
213 | Create a new process and return it. When the sub returns the process |
208 | automatically terminates. To start the process you must first put it into |
214 | automatically terminates as if C<terminate> with the returned values were |
209 | the ready queue by calling the ready method. |
215 | called. To start the process you must first put it into the ready queue by |
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216 | calling the ready method. |
210 | |
217 | |
211 | The coderef you submit MUST NOT be a closure that refers to variables |
218 | The coderef you submit MUST NOT be a closure that refers to variables |
212 | in an outer scope. This does NOT work. Pass arguments into it instead. |
219 | in an outer scope. This does NOT work. Pass arguments into it instead. |
213 | |
220 | |
214 | =cut |
221 | =cut |
… | |
… | |
224 | }, $class; |
231 | }, $class; |
225 | } |
232 | } |
226 | |
233 | |
227 | =item $process->ready |
234 | =item $process->ready |
228 | |
235 | |
229 | Put the current process into the ready queue. |
236 | Put the given process into the ready queue. |
230 | |
237 | |
231 | =cut |
238 | =cut |
232 | |
239 | |
233 | sub ready { |
240 | =item $process->cancel |
|
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241 | |
|
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242 | Like C<terminate>, but terminates the specified process instead. |
|
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243 | |
|
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244 | =cut |
|
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245 | |
|
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246 | sub cancel { |
234 | push @ready, $_[0]; |
247 | push @destroy, $_[0]; |
|
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248 | $manager->ready; |
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249 | &schedule if $current == $_[0]; |
|
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250 | } |
|
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251 | |
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252 | =item $process->join |
|
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253 | |
|
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254 | Wait until the coroutine terminates and return any values given to the |
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255 | C<terminate> function. C<join> can be called multiple times from multiple |
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256 | processes. |
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257 | |
|
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258 | =cut |
|
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259 | |
|
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260 | sub join { |
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261 | my $self = shift; |
|
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262 | unless ($self->{status}) { |
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263 | push @{$self->{join}}, $current; |
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264 | &schedule; |
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265 | } |
|
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266 | wantarray ? @{$self->{status}} : $self->{status}[0]; |
|
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267 | } |
|
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268 | |
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269 | =item $oldprio = $process->prio($newprio) |
|
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270 | |
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271 | Sets the priority of the process. Higher priority processes get run before |
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272 | lower priority processes. Priorities are smalled signed integer (currently |
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273 | -4 .. +3), that you can refer to using PRIO_xxx constants (use the import |
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274 | tag :prio to get then): |
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275 | |
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276 | PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN |
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277 | 3 > 1 > 0 > -1 > -3 > -4 |
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278 | |
|
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279 | # set priority to HIGH |
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280 | current->prio(PRIO_HIGH); |
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281 | |
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282 | The idle coroutine ($Coro::idle) always has a lower priority than any |
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283 | existing coroutine. |
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284 | |
|
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285 | Changing the priority of the current process will take effect immediately, |
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286 | but changing the priority of processes in the ready queue (but not |
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287 | running) will only take effect after the next schedule (of that |
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288 | process). This is a bug that will be fixed in some future version. |
|
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289 | |
|
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290 | =cut |
|
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291 | |
|
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292 | sub prio { |
|
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293 | my $old = $_[0]{prio}; |
|
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294 | $_[0]{prio} = $_[1] if @_ > 1; |
|
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295 | $old; |
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296 | } |
|
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297 | |
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298 | =item $newprio = $process->nice($change) |
|
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299 | |
|
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300 | Similar to C<prio>, but subtract the given value from the priority (i.e. |
|
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301 | higher values mean lower priority, just as in unix). |
|
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302 | |
|
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303 | =cut |
|
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304 | |
|
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305 | sub nice { |
|
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306 | $_[0]{prio} -= $_[1]; |
235 | } |
307 | } |
236 | |
308 | |
237 | =back |
309 | =back |
238 | |
310 | |
239 | =cut |
311 | =cut |
240 | |
312 | |
241 | 1; |
313 | 1; |
242 | |
314 | |
243 | =head1 BUGS/LIMITATIONS |
315 | =head1 BUGS/LIMITATIONS |
244 | |
316 | |
245 | - could be faster, especially when the core would introduce special |
317 | - you must make very sure that no coro is still active on global destruction. |
246 | support for coroutines (like it does for threads). |
318 | very bad things might happen otherwise (usually segfaults). |
247 | - there is still a memleak on coroutine termination that I could not |
|
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248 | identify. Could be as small as a single SV. |
|
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249 | - this module is not well-tested. |
|
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250 | - if variables or arguments "disappear" (become undef) or become |
|
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251 | corrupted please contact the author so he cen iron out the |
|
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252 | remaining bugs. |
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253 | - this module is not thread-safe. You must only ever use this module from |
319 | - this module is not thread-safe. You must only ever use this module from |
254 | the same thread (this requirement might be loosened in the future to |
320 | the same thread (this requirement might be loosened in the future to |
255 | allow per-thread schedulers, but Coro::State does not yet allow this). |
321 | allow per-thread schedulers, but Coro::State does not yet allow this). |
256 | |
322 | |
257 | =head1 SEE ALSO |
323 | =head1 SEE ALSO |
258 | |
324 | |
259 | L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, |
325 | L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, |
260 | L<Coro::Signal>, L<Coro::State>, L<Coro::Event>. |
326 | L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>, |
|
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327 | L<Coro::Handle>, L<Coro::Socket>. |
261 | |
328 | |
262 | =head1 AUTHOR |
329 | =head1 AUTHOR |
263 | |
330 | |
264 | Marc Lehmann <pcg@goof.com> |
331 | Marc Lehmann <pcg@goof.com> |
265 | http://www.goof.com/pcg/marc/ |
332 | http://www.goof.com/pcg/marc/ |