...cinap_lenrek@gmx.de Subject: Re: [9fans] notes and traps Date: Fri, 29 Aug...> 8.out 12490667: suicide: sys: trap: general protection violation pc=0x00001333 ... discussions on the implementation of notes and didn't find anything in... 8.out 12490667: suicide: sys: trap: general protection violation pc=0x00001333 ... discussions on the implementation of notes and didn't find anything ...

... this how it works now?), make notes unreliable or block the sender? ... to handle it without losing user notes while make sure internal system notes...note[1], p->nnote * sizeof(p->note[0])); p->nnote++; } } else { x =...the following conditions hold true: - internal notes get *always* posted (so the process...that while processing a previous user note, that this caused an internal note...

...process the pending 5 user notes. With my suggested patch, it...no, it would lose the note with the current implementation. make...improvement to me. losing the trap note and *not* handling it...way? a keyboard interrupt? External notes are the ones posted to...writes "interrupt" the the programs note file running in the window...worked perfectly. The problem with notes and signals are that it...

... with a better understanding of what notes are supposed to be could answer...the other side inpostnote(), where the note is put in the up->note... how it works now?), make notes unreliable or block the sender?... to me. sleeping in a note handler seems like it's ... keeps up->notified around to note (ha!) this fact. as a ... a special dodge of a note continuation handler for ape available....

purely as an aside this detailed conversation on how notes are handled in the kernel is very interesting, I was trying to understand this myself recently and gave up; I will now try again. Thanks, -Steve

... has not handed a system note when it gets another. which has... other side inpostnote(), where the note is put in the up->... is carefully constructed to abuse notes beyond reason. Its the extract ... someone wrong. sleeping in a note handler seems like it's ..., why is sleep() in a note handler a bad idea? having ... for broken system calls. but notes, like signals, tend to be ...

...*can* send you further (NUser) notes without doing any harm. If ... see: /sys/src/9/pc/trap.c: notify() ... if(n->flag!=... has not handed a system note when it gets another. the ... is carefully constructed to abuse notes beyond reason. sleeping in a ... me. having two threads sending notes to the same proc including ... for broken system calls. but notes, like signals, tend to be...

...> 8.out 12490667: suicide: sys: trap: general protection violation pc=0x00001333 okay...dead meat if you receive a note while you're in the note handler. that is, up->notified = 1. it looks pretty clear ...'t get 3-4 note before the note handler is called, ... this, calling sleep() from the note handler is an especially bad ... discussions on the implementation of notes and didn't find anything ...

...> 8c test.c 8a int80.s 8l test.8 int80.8 ./8.out 8.out 12490667: suicide: sys: trap: general protection violation pc=0x00001333 the parent process loops and does "fake" syscalls while the child posts notes to it. arg... swap parent <-> child... but you'll see it in the code. -- cinap

.../sources/contrib/cinap_lenrek/traptest/ 8c test.c 8a int80.s 8l test.8 int80.8 ./8.out 8.out 12490667: suicide: sys: trap: general protection violation pc=0x00001333 the parent process loops and does "fake" syscalls while the child posts notes to it. - erik -- cinap