1995/0108/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) {
1995/0108		int n; if(up) { n = up->inlock+2; up->inlock = n; if(tas(&l->key) == 0) return; for(;;){ while(l->key) if(conf.nproc == 1) { up->yield = 1; sched(); } up->inlock = n; if(tas(&l->key) == 0) return; } }
1993/1204		if(tas(&l->key) == 0) return;
1993/0830		for(;;){
1994/0808		while(l->key) ;
1993/0830		if(tas(&l->key) == 0)
1992/0222		return; } }
1994/0322		void ilock(Lock *l) {
1994/0323		ulong x; 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;
1994/0323		}
1994/0322		} }
1992/0222		int canlock(Lock *l) { if(tas(&l->key)) return 0;
1994/0322
1992/0222		return 1; } void unlock(Lock *l) {
1995/0108		int n;
1992/0222		l->key = 0;
1995/0108		if(up) { n = up->inlock-2; if(n < 0) n = 0; up->inlock = n; }
1994/0322		} void iunlock(Lock *l) { ulong sr; sr = l->sr; l->key = 0; splx(sr);
1992/0222		}