type schedt struct {
    pidle  puintptr;
    npidle init32,gfree *g;
    ngfree int32;
    runqhead guintptr;
   runqtail guintptr;

sudogcache *sudog;
}
type g struct {
 stack stack;
 shed gobuf;//执行现场
 gopc uintptr;//下一条指令地址
 startpc uintptr;
}
type p struct {
   gfree *g;
   gfreecnt int32;
   runqhead guintptr;
   runqtail guintptr;

sudocache []*sudo;

sudobuf [128]*sudo;

};
type m struct {

g0 *g;

mstartfn func();

curg *g;

p uintptr;

nextp unintptr;

spining bool;//自旋锁

park note; //

shedlink muintptr; //链表
};

type mcache struct {

alloc [xx]*span;

stackcache [xx]*stackfreelist;

};