1995/0109/port/taslock.c (diff list | history)

1995/0108/sys/src/9/port/taslock.c:38,70 – 1995/0109/sys/src/9/port/taslock.c:38,60 (short | long | prev | next)
1992/0222		} }
1994/0322		void ilock(Lock *l)
1995/0109		int canlock(Lock *l)
1994/0322		{
1994/0323		ulong x;
1995/0109		int n;
1994/0323		x = splhi(); if(tas(&l->key) == 0){ l->sr = x;
1994/0322		return;
1994/0323		}
1994/0525
1994/0322		for(;;){ while(l->key) ;
1994/0323		if(tas(&l->key) == 0){ l->sr = x;
1994/0322		return;
1995/0109		if(up) { n = up->inlock; up->inlock = n+2; if(tas(&l->key)) { up->inlock = n; return 0;
1994/0323		}
1995/0109		return 1;
1994/0322		} }
1992/0222		int canlock(Lock *l) { if(tas(&l->key)) return 0;
1994/0322
1992/0222		return 1; }
1995/0108/sys/src/9/port/taslock.c:73,79 – 1995/0109/sys/src/9/port/taslock.c:63,68
1992/0222		{
1995/0108		int n;
1992/0222		l->key = 0;
1995/0108		if(up) { n = up->inlock-2; if(n < 0)
1995/0108/sys/src/9/port/taslock.c:80,93 – 1995/0109/sys/src/9/port/taslock.c:69,93
1995/0108		n = 0; up->inlock = n; }
1995/0109		l->key = 0;
1994/0322		} void
1995/0109		ilock(Lock *l) { ulong sr; sr = splhi(); lock(l); l->sr = sr; } void
1994/0322		iunlock(Lock *l) { ulong sr; sr = l->sr; l->key = 0;
1995/0109		unlock(l);
1994/0322		splx(sr);
1992/0222		}