1997/0220/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", l->key, pc, l->pc, l->pid); dumpaproc(up);
1996/0523		/* lower priority till we get the lock */ if(up && up->state == Running && (getstatus()&IE)){ up->lockpri = 1; sched(); }
1995/1030		} void
1992/0222		lock(Lock *l) {
1996/0523		int i;
1996/0522		ulong pc, pid;
1995/1009		pc = getcallerpc(l);
1996/0523		pid = up ? up->pid : 0;
1995/1009
1996/0522		if(tas(&l->key) == 0){ l->pc = pc; l->pid = pid;
1995/0110		return;
1995/1009		}
1995/0108
1996/0522		for(;;){ i = 0; while(l->key)
1996/0523		if(i++ > 100000000){ i = 0; lockloop(l, pc);
1996/0522		}
1995/1009		if(tas(&l->key) == 0){ l->pc = pc;
1996/0522		l->pid = pid;
1996/0523		if(up) up->lockpri = 0;
1995/0108		return;
1995/1009		}
1995/0108		}
1995/0110		}
1995/0108
1995/0110		void ilock(Lock *l) { ulong x;
1995/1030		ulong pc, pid;
1995/0110
1995/1009		pc = getcallerpc(l);
1995/1030		pid = up ? up->pid : 0;
1995/1009
1995/0110		x = splhi(); if(tas(&l->key) == 0){ l->sr = x;
1995/1009		l->pc = pc;
1995/1030		l->pid = pid;
1993/1204		return;
1995/0110		}
1993/0830		for(;;){
1994/0808		while(l->key) ;
1995/0110		if(tas(&l->key) == 0){ l->sr = x;
1995/1009		l->pc = pc;
1995/1030		l->pid = pid;
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);
1996/0523		l->pid = up ? up->pid : 0;
1992/0222		return 1; } void unlock(Lock *l) {
1996/0511		l->key = 0;
1996/0522		l->pc = 0;
1997/0220		coherence();
1994/0322		} void iunlock(Lock *l) { ulong sr; sr = l->sr;
1995/0110		l->key = 0;
1995/1014		l->pc = 0;
1994/0322		splx(sr);
1997/0220		coherence();
1992/0222		}