单项选择题

有两个并发进程如下面所示，对于这段程序的运行，正确的说法是______。
PARBEGIN
var x: integer;
process P1 process P2
var y, z: integer; var t, u: integer;
BEGIN BEGIN
x: =1; x: =0;
y: =0; t: =0;
if x＞=1 then y: =y+1; if x＜=1 then t: =t+2;
z: =y; u: =t;
END END
PAREND