1998/0604/port/taslock.c (diff list | history)

port/taslock.c on 1992/0222
1992/0222		#include "u.h"
1992/0321		#include "../port/lib.h"
1992/0222		#include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" void
1995/1030		lockloop(Lock *l, ulong pc) { print("lock loop key 0x%lux pc 0x%lux held by pc 0x%lux proc %d\n",
1998/0604		l->key, pc, l->pc, l->p ? l->p->pid : 0);
1995/1030		dumpaproc(up);
1996/0523
1998/0604		if(up && up->state == Running && islo())
1996/0523		sched();
1995/1030		} void
1992/0222		lock(Lock *l) {
1996/0523		int i;
1998/0604		ulong pc;
1995/1009		pc = getcallerpc(l);
1996/0522		if(tas(&l->key) == 0){ l->pc = pc;
1998/0604		l->p = up; l->isilock = 0; if(up){ l->pri = up->priority; up->priority = PriLock; }
1995/0110		return;
1995/1009		}
1995/0108
1996/0522		for(;;){ i = 0;
1998/0604		while(l->key){ if(conf.nmach < 2){ if(i++ > 1000){ i = 0; lockloop(l, pc); } sched(); } else { if(i++ > 100000000){ i = 0; lockloop(l, pc); }
1996/0522		}
1998/0604		}
1995/1009		if(tas(&l->key) == 0){ l->pc = pc;
1998/0604		l->p = up; l->isilock = 0; if(up){ l->pri = up->priority; up->priority = PriLock; }
1995/0108		return;
1995/1009		}
1995/0108		}
1995/0110		}
1995/0108
1995/0110		void ilock(Lock *l) { ulong x;
1998/0604		ulong pc;
1995/0110
1995/1009		pc = getcallerpc(l);
1995/0110		x = splhi(); if(tas(&l->key) == 0){ l->sr = x;
1995/1009		l->pc = pc;
1998/0604		l->p = up; l->isilock = 1;
1993/1204		return;
1995/0110		}
1998/0522		if(conf.nmach < 2) panic("ilock: no way out: pc %uX\n", pc);
1993/0830		for(;;){
1998/0228		splx(x);
1994/0808		while(l->key) ;
1998/0228		x = splhi();
1995/0110		if(tas(&l->key) == 0){ l->sr = x;
1995/1009		l->pc = pc;
1998/0604		l->p = up; l->isilock = 1;
1992/0222		return;
1995/0110		}
1992/0222		} }
1995/0109		int canlock(Lock *l)
1994/0322		{
1996/0522		if(tas(&l->key))
1996/0511		return 0;
1996/0522		l->pc = getcallerpc(l);
1998/0604		l->p = up; l->isilock = 0; if(up){ l->pri = up->priority; up->priority = PriLock; }
1992/0222		return 1; } void unlock(Lock *l) {
1998/0604		int p; p = l->pri;
1998/0522		if(l->key == 0) print("unlock: not locked: pc %uX\n", getcallerpc(l));
1998/0604		if(l->isilock) print("iunlock of lock: pc %lux, held by %lux\n", getcallerpc(l), l->pc);
1996/0522		l->pc = 0;
1997/0327		l->key = 0;
1998/0604		if(up && p < up->priority) up->priority = p;
1997/0220		coherence();
1994/0322		} void iunlock(Lock *l) { ulong sr;
1998/0603		if(l->key == 0) print("iunlock: not locked: pc %uX\n", getcallerpc(l));
1998/0604		if(!l->isilock) print("unlock of ilock: pc %lux, held by %lux\n", getcallerpc(l), l->pc);
1998/0603
1994/0322		sr = l->sr;
1995/1014		l->pc = 0;
1997/0327		l->key = 0;
1994/0322		splx(sr);
1997/0220		coherence();
1992/0222		}