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libthread: use "interrupt" proc ctl message instead of posting a note for threadint()

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threadint() is called to interrupt channel operation or a system call.
the kernel provides a new "interrupt" procctl message to interrupt a
process commited to or being in a blocking syscall, which is similar,
but not the same. the main difference is that "interrupt" condition
is not cleared before the process actually attempts to block. also
can be cleared with "nointerrupt" ctl message. see proc(3)
This commit is contained in:
cinap_lenrek 2015-08-10 03:48:37 +02:00
parent a98f911a17
commit c235046310
1 changed files with 12 additions and 0 deletions
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12
sys/src/libthread/kill.c
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@ -79,8 +79,20 @@ threadint(int id)
static void
tinterrupt(Proc *p, Thread *t)
{
char buf[64];
int fd;
switch(t->state){
case Running:
snprint(buf, sizeof(buf), "/proc/%d/ctl", p->pid);
fd = open(buf, OWRITE|OCEXEC);
if(fd >= 0){
if(write(fd, "interrupt", 9) == 9){
close(fd);
break;
}
close(fd);
}
postnote(PNPROC, p->pid, "threadint");
break;
case Rendezvous: