WebMay 12, 2024 · 通过 New 的源码以及 globalRand.Int63n 的源码可以看到关键点是 lockedSource.Int63 方法的定义: type lockedSource struct { lk sync.Mutex src Source64 } func (r *lockedSource) Int63() (n int64) { r.lk.Lock() n = r.src.Int63() r.lk.Unlock() return } 通过同样的方法查看其他默认的随机函数可以发现，所有的默认随机函数都共享了一个全局 … Webreturn Int63 () & (n - 1) } max := int64 ( (1 << 63) - 1 - (1<<63)%uint64 (n)) v := Int63 () for v > max { v = Int63 () } return v % n } // Int31n returns, as an int32, a non-negative pseudo-random number in [0,n). // It panics if n <= 0. // For implementation details, see:

OpenCensus

WebDec 18, 2024 · @tkausl Int63n returns, as an int64, a non-negative pseudo-random number in [0,n) from the default Source. It panics if n <= 0, so if max is max 64 bit integer it does not return it. Also it accepts a int not an unsigned it. – gosom Dec 17, 2024 at 15:29 @gosom: Converting a uint64 to an int64 is trivial, and should be self-evident. – Jonathan Hall Webfunc Int63n ¶ func Int63n(n int64) int64. Int63n returns, as an int64, a non-negative pseudo-random number in the half-open interval [0,n) from the default Source. It panics if n <= 0. … lawn care for less

Golang Rand.Int63方法代码示例 - 纯净天空

WebMar 26, 2024 · You are allowed to generate the non-negative pseudo-random number of 63-bit integer as an int64 type from the default source with the help of the Int63 () function … http://go.dev/blog/race-detector WebJun 17, 2024 · Your program has multiple problems: You are spawning multiple goroutines that are operating on shared variables i.e., max and num leading to data race as they are not protected (eg. by Mutex). Here num is modified by every worker goroutine but it should have been local to the worker otherwise the computed data could be lost (eg. one worker … lawn care forest lake mn