1992/0428/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 lock(Lock *l) { Lock *ll = l; int i; ulong pc; pc = getcallerpc(((uchar*)&l) - sizeof(l));
1992/0428		if(l == 0){ print("pc= %lux", pc); for(;;); }
1992/0222		for(i = 0; i < 1000000; i++){ if (tas(&ll->key) == 0){ if(u) u->p->hasspin = 1; ll->pc = pc; return; } if(u && u->p->state == Running) sched(); } 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); } 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) { l->pc = 0; l->key = 0; if(u && u->p) u->p->hasspin = 0; }