1992/0913/port/taslock.c (diff list | history)

1992/0913/sys/src/9/port/taslock.c:1,51 – 1992/0914/sys/src/9/port/taslock.c:1,47 (short | long | prev | next)
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 lock(Lock *l) { Lock *ll = l; int i; ulong pc; pc = getcallerpc(((uchar*)&l) - sizeof(l));
1992/0912		for(i = 0; i < 100000000; i++){
1992/0222		if (tas(&ll->key) == 0){
1992/0914		for(i = 0; i < 10000000; i++){ if (tas(&l->key) == 0){
1992/0222		if(u) u->p->hasspin = 1; ll->pc = pc;
1992/0914		l->pc = pc;
1992/0222		return; } } i = l->key; l->key = 0;                  panic("lock loop 0x%lux key 0x%lux pc 0x%lux held by pc 0x%lux\n", l, i, pc, l->pc);
1992/0914		panic("lock loop 0x%lux key 0x%lux pc 0x%lux held by pc 0x%lux\n", l->key, i, pc, l->pc);
1992/0222		} int canlock(Lock *l) { if(tas(&l->key)) return 0; l->pc = getcallerpc(((uchar*)&l) - sizeof(l)); if(u && u->p) u->p->hasspin = 1; return 1; } void unlock(Lock *l) {
1992/0913		int s;
1992/0222		l->pc = 0; l->key = 0; if(u && u->p) u->p->hasspin = 0; }