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Overview
| Comment: | Modify [coroutine::util gets/gets_safety/read] to restore any original event handler on the channel, and to not be so busy. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
8a5b6fdec2b4f5606c9f959653251e9f |
| User & Date: | pooryorick 2022-01-17 23:43:18 |
Context
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2022-01-18
| ||
| 07:43 | coroutine: Reduce quoting and add procedure markers. check-in: cb716671f7 user: pooryorick tags: trunk | |
|
2022-01-17
| ||
| 23:43 | Modify [coroutine::util gets/gets_safety/read] to restore any original event handler on the channel, and to not be so busy. check-in: 8a5b6fdec2 user: pooryorick tags: trunk | |
| 22:44 | Update the documentation for "longest common subsequence". check-in: d23cf1bb9d user: pooryorick tags: trunk | |
Changes
Changes to modules/coroutine/coroutine.tcl.
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}
yield
return
}
# - -- --- ----- -------- -------------
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}
yield
return
}
# - -- --- ----- -------- -------------
proc ::coroutine::util::gets args {
# Process arguments.
# Acceptable syntax:
# * gets CHAN ?VARNAME?
if {[llength $args] == 2} {
# gets CHAN VARNAME
lassign $args chan varname
|
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# necessary error with the proper message.
tailcall ::chan gets {*}$args
}
# Loop until we have a complete line. Yield to the event loop
# where necessary. During
set blocking [::chan configure $chan -blocking]
| | > | | > | | | < | | | < | < | < < | | | | | | > > > > < > > > > | < | < < | > | | > > > > > | | < | < < | | | < | < | | | | < | < < | | | | | | | | < < < | | | < | < | | | | < | < < | | | | | | | > > > > | 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 |
# necessary error with the proper message.
tailcall ::chan gets {*}$args
}
# Loop until we have a complete line. Yield to the event loop
# where necessary. During
set blocking [::chan configure $chan -blocking]
set readable [::chan event $chan readable]
::chan event $chan readable [list [info coroutine]]
::chan configure $chan -blocking 0
try {
while 1 {
try {
set result [::chan gets $chan line]
} on error {result opts} {
return -code $result -options $opts
}
if {[::chan blocked $chan]} {
yield
} else {
if {[llength $args] == 2} {
return $result
} else {
return $line
}
}
}
} finally {
::chan configure $chan -blocking $blocking
::chan event $chan readable $readable
}
}
proc ::coroutine::util::gets_safety {chan limit varname {timeout 120000}} {
# Process arguments.
# Acceptable syntax:
# * gets CHAN ?VARNAME?
# Loop until we have a complete line. Yield to the event loop
# where necessary. During
upvar 1 $varname line
set blocking [::chan configure $chan -blocking]
::chan configure $chan -blocking 0
set readable [::chan event $chan readable]
::chan event $chan readable [list [info coroutine] readable]
try {
while 1 {
if {[::chan pending input $chan]>= $limit} {
error {Too many notes, Mozart. Too many notes}
}
try {
set result [::chan gets $chan line]
} on error {result opts} {
return -code $result -options $opts
}
if {[::chan blocked $chan]} {
set timeoutevent [::after $timeout [list [info coroutine] timeout]]
set event [yield]
if {$event eq "timeout"} {
error "Connection Timed Out"
}
::after cancel $timeoutevent
} else {
return $result
}
}
} finally {
::chan configure $chan -blocking $blocking
::chan event $chan readable $readable
}
}
# - -- --- ----- -------- -------------
proc ::coroutine::util::read args {
# Process arguments.
# Acceptable syntax:
# * read ?-nonewline ? CHAN
# * read CHAN ?n?
if {[llength $args] > 2} {
# Calling the builtin read command with the bogus arguments
# gives us the necessary error with the proper message.
::chan read {*}$args
return
}
set total Inf ; # Number of characters to read. Here: Until eof.
set chop no ; # Boolean flag. Determines if we have to trim a
# # \n from the end of the read string.
if {[llength $args] == 2} {
lassign $args a b
if {$a eq {-nonewline}} {
set chan $b
set chop yes
} else {
lassign $args chan total
}
} else {
lassign $args chan
}
# Run the read loop. Yield to the event loop where
# necessary. Differentiate between loop until eof, and loop until
# n characters have been read (or eof reached).
set buf {}
set blocking [::chan configure $chan -blocking]
set readable [::chan event $chan readable]
::chan event $chan readable [list [info coroutine]]
::chan configure $chan -blocking 0
try {
if {$total eq "Inf"} {
# Loop until eof.
while 1 {
if {[::chan eof $chan]} {
break
} elseif {[::chan blocked $chan]} {
yield
}
try {
set result [::chan read $chan]
} on error {result opts} {
return -code $result -options $opts
}
append buf $result
}
} else {
# Loop until total characters have been read, or eof found,
# whichever is first.
set left $total
while 1 {
if {[::chan eof $chan]} {
break
} elseif {[::chan blocked $chan]} {
yield
}
try {
set result [::chan read $chan $left]
} on error {result opts} {
return -code $result -options $opts
}
append buf $result
incr left -[string length $result]
if {!$left} {
break
}
}
}
} finally {
::chan configure $chan -blocking $blocking
::chan event $chan readable $readable
}
if {$chop && [string index $buf end] eq "\n"} {
set buf [string range $buf 0 end-1]
}
return $buf
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