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Diffstat (limited to 'threadlib/doc/help-detach.pd')
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diff --git a/threadlib/doc/help-detach.pd b/threadlib/doc/help-detach.pd new file mode 100755 index 0000000..03895aa --- /dev/null +++ b/threadlib/doc/help-detach.pd @@ -0,0 +1,105 @@ +#N canvas 658 0 480 847 10; +#X obj 29 23 cnv 15 404 54 empty empty empty 22 25 0 18 -1 -66577 0 +; +#X obj 31 25 cnv 15 400 50 empty empty threadlib 22 25 0 18 -228992 +-66577 0; +#X text 322 34 help file of; +#X text 316 50 ::: detach :::; +#X text 39 783 =%)!(%= threadlib \, by Georg Holzmann <grh@mur.at> +\, 2005; +#X text 82 817 htttp://grh.mur.at/software/threadlib.html; +#X text 29 150 Detach is working on control objects only \, creates +a helper thread and runs all functions of the following object in this +helper thread.; +#X text 27 194 If a message form that thread reaches a join object +a callback for running the outlet function will be placed in the scheduler +and run in the next scheduler loop - so you can synchronize the message +with pd's main thread again.; +#X text 173 110 ::: DETACH :::; +#X text 28 251 Detach is useful \, if you have a control operation +that would be too CPU-intensive and would disturb dsp.; +#X obj 223 717 sleep; +#X obj 178 717 join; +#X obj 273 717 threadedsf; +#X text 98 717 see also:; +#X text 163 324 see the examples:; +#X text 154 407 !!!!! WARNING !!!!!; +#X text 30 436 detach/join provide the possibility of threaded patching +\, beware of the risks:; +#X text 30 466 - not every pd object is thread-safe (if unsure \, look +at the source \, ask the pd-list or me); +#X text 31 497 - pd is not completely thread-safe itself; +#X text 31 516 - everything that is triggered by the detached message +will be detached - so don't mix threaded and non-threaded message paths +unless you know what you are doing. use join to synchronize with the +main pd thread !; +#X text 31 575 - if detach/join crashes pd during a performance \, +don't complain ...; +#X text 31 607 - both detach and join have an overhead ... so only +use them if you really need threaded patching \, e.g. have a subpatch +that has to run for quite some time and would interrupt audio or something +else; +#X text 67 800 heavily based on pd_devel code by Tim Blechmann; +#N canvas 421 0 803 576 detach_join_examples 0; +#X msg 117 105 5; +#X obj 117 133 sleep; +#X text 37 39 1) this will block the system for 5 sec:; +#X obj 117 161 print EX1_DONE; +#X text 554 112 (instead of sleep you could; +#X msg 499 73 5; +#X obj 499 123 sleep; +#X text 396 39 2) to avoid this you can run it in a helper thread: +; +#X obj 499 97 detach; +#X obj 499 184 print EX2_DONE; +#X text 560 127 of course use an other cpu; +#X text 559 143 intensive object which could; +#X text 561 158 block the main thread); +#X text 34 252 3) be aware that each object connected to; +#X text 55 267 detach will run in the helper thread:; +#X msg 127 305 5; +#X obj 127 366 sleep; +#X obj 127 330 detach; +#X obj 170 397 print EX3_DONE_1; +#X msg 127 396 5; +#X obj 127 433 sleep; +#X obj 127 514 print EX3_DONE_2; +#X text 179 436 <- also in helper thread; +#X text 164 457 (and anything else connected; +#X text 171 472 to objects which are connected; +#X text 172 487 to detach !); +#X text 392 251 4) to synchronize these objects with pd main thread +; +#X text 413 268 again you have to use the join object:; +#X text 58 56 (so you will get e.g. an 5 sec; +#X text 61 71 audio drop out !); +#X msg 503 303 5; +#X obj 503 364 sleep; +#X obj 503 328 detach; +#X msg 503 394 5; +#X obj 546 395 print EX4_DONE_1; +#X text 579 368 <- in helper thread; +#X obj 503 431 join; +#X obj 503 463 sleep; +#X obj 503 518 print EX4_DONE_2; +#X text 551 464 <- in main thread again; +#X text 551 481 (and will so block the system); +#X connect 0 0 1 0; +#X connect 1 0 3 0; +#X connect 5 0 8 0; +#X connect 6 0 9 0; +#X connect 8 0 6 0; +#X connect 15 0 17 0; +#X connect 16 0 18 0; +#X connect 16 0 19 0; +#X connect 17 0 16 0; +#X connect 19 0 20 0; +#X connect 20 0 21 0; +#X connect 30 0 32 0; +#X connect 31 0 33 0; +#X connect 31 0 34 0; +#X connect 32 0 31 0; +#X connect 33 0 36 0; +#X connect 36 0 37 0; +#X connect 37 0 38 0; +#X restore 141 343 pd detach_join_examples; |