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#include <u.h>
#include <libc.h>
#include <thread.h>
#include "threadimpl.h"
static void tinterrupt(Proc*, Thread*);
static void
threadxxxgrp(int grp, int dokill)
{
Proc *p;
Thread *t;
lock(&_threadpq.lock);
for(p=_threadpq.head; p; p=p->next){
lock(&p->lock);
for(t=p->threads.head; t; t=t->nextt)
if(t->grp == grp){
if(dokill)
t->moribund = 1;
tinterrupt(p, t);
}
unlock(&p->lock);
}
unlock(&_threadpq.lock);
_threadbreakrendez();
}
static void
threadxxx(int id, int dokill)
{
Proc *p;
Thread *t;
lock(&_threadpq.lock);
for(p=_threadpq.head; p; p=p->next){
lock(&p->lock);
for(t=p->threads.head; t; t=t->nextt)
if(t->id == id){
if(dokill)
t->moribund = 1;
tinterrupt(p, t);
unlock(&p->lock);
unlock(&_threadpq.lock);
_threadbreakrendez();
return;
}
unlock(&p->lock);
}
unlock(&_threadpq.lock);
_threaddebug(DBGNOTE, "Can't find thread to kill");
return;
}
void
threadkillgrp(int grp)
{
threadxxxgrp(grp, 1);
}
void
threadkill(int id)
{
threadxxx(id, 1);
}
void
threadintgrp(int grp)
{
threadxxxgrp(grp, 0);
}
void
threadint(int id)
{
threadxxx(id, 0);
}
static int
writeprocctl(int pid, char *ctl)
{
char buf[32];
int fd;
snprint(buf, sizeof(buf), "/proc/%lud/ctl", (ulong)pid);
fd = open(buf, OWRITE|OCEXEC);
if(fd < 0)
return -1;
if(write(fd, ctl, strlen(ctl)) < 0){
close(fd);
return -1;
}
close(fd);
return 0;
}
static void
tinterrupt(Proc *p, Thread *t)
{
switch(t->state){
case Running:
if(writeprocctl(p->pid, "interrupt") < 0)
postnote(PNPROC, p->pid, "threadint");
break;
case Rendezvous:
_threadflagrendez(t);
break;
}
}
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