当goroutine向MCache申请内存时,当与申请内存匹配的Span Class的MSpan没有可提供的Object时候,就会从MCentral申请新的存储空间,当然,这一步需要加锁处理。 typemcachestruct{//The following members are accessed on every malloc,//so they are grouped here
constnumSpanClasses=_NumSizeClasses<<1// means (67<<1)// Per-thread (in Go, per-P) cache for small objects.// No locking needed because it is per-thread (per-P)./// mcaches are allocated from non-GC'd memory, so any heap pointers// must be specially handled.///go:notinheap...
central for i:=range h.central{ mCentral_Init(&h.central[i].mcentral,int32(i)) } // 将全局变量 h_spans指向heap.spans sp:= (slice)(unsafe.Pointer(&h_spans)) sp.array=unsafe.Pointer(h.spans) sp.len=int(spans_size/ptrSize) sp.cap=int(spans_size/ptrSize) } 强烈建议所有程序员都...
AI代码解释 admin@C02ZL010LVCKhellomodule%go mod tidygo:finding moduleforpackagego.uber.org/zapgo:finding moduleforpackagegithub.com/valyala/fasthttpgo:downloading github.com/valyala/fasthttp v1.34.0go:found github.com/valyala/fasthttpingithub.com/valyala/fasthttp v1.34.0go:found go.uber.org/zapingo...
chan.go iface.go slice.go string.go mfinal.go gc会用到 malloc.go newarray等申请内存的动作 3、tidy allocator 微对象分配器 申请: 释放: 4、mcache 申请: 释放: 5、mcentral 申请: 释放: 6、mheap 申请: 释放: 编辑于 2024-01-08 13:38・广东 ...
// Allocate a new span of npage pages from the heap for GC'd memory // and record its size class in the HeapMap and HeapMapCache. func (h *mheap) alloc_m(npage uintptr, spanclass spanClass, large bool) *mspan { _g_ := getg() if _g_ != _g_.m.g0 { throw("_mheap_al...
golang 中有两个内建函数new, make,用于内存分配与初始化。在面试中这两种内建函数有何不同之处会经常被问到,因此笔者进行下列总结。 1. new(T) new接受一个类型参数,在内存中为类型分配一片初始化后的内存,返回指向该类型的指针。 “The new built-in function allocates memory. The first argument is ...
// growslice allocates new backing store for a slice./// arguments:/// oldPtr = pointer to the slice's backing array// newLen = new length (= oldLen + num)// oldCap = original slice's capacity.// num = number of elements being added// et = element type/// return ...
// but see uninitialized memory or stale heap bits. publicationBarrier() // 如果当前在GC中, 需要立刻标记分配后的对象为"黑色", 防止它被回收 // Allocate black during GC. // All slots hold nil so no scanning is needed. // This may be racing with GC so do it atomically if there can ...
Otherwise, on weakly ordered machines, // the garbage collector could follow a pointer to x, // but see uninitialized memory or stale heap bits. publicationBarrier() // 如果当前在GC中, 需要立刻标记分配后的对象为"黑色", 防止它被回收 // Allocate black during GC. // All slots hold nil ...