goroutine

Given the following code: package main import ( "fmt" "math/rand" "time" ) func main() { for i := 0; i < 3; i++ { go f(i) } // prevent main from exiting immediately var input string fmt.Scanln(&input) } func f(n int) { for i := 0; i < 10; i++ { dowork(n, i) amt := time.Duration(rand.Intn(250)) time.Sleep(time.Millisecond * amt) } } func dowork(goroutine, loopindex int) { // simulate work time.Sleep(time.Second * time.Duration(5)) fmt.Printf("gr[%d]: i=%d\n", goroutine, loopindex) } Can i assume that the 'dowork' function will be executed in parallel? Is this a correct way of achieving

I use Go and Gin to setup my website and want to know the database access time. I use goroutine so if don't use something like thread-local, I must change almost every function to do it. Does Go have a good way to do it? The Go runtime and standard libraries do not provide goroutine local storage or a goroutine identifier that can be used to implement goroutine local storage. The third party gls package implements goroutine local storage in an interesting way. Some find this package horrifying and others think it's clever. The Go team recommends passing context explicitly as function argument

I have a simple code that prints GET response time for each URL listed in a text file (url_list.txt). When the requests are fired sequentially the returned times correspond to the expected response times of individual URLs. However, when the same code is executed concurrently the returned response times are typically higher than expected. It seems that the time_start I capture before the http.Get(url) is called is not the time of when the request is actually sent. I guess the execution of http.Get(url) is queued to some extend. Is there a better way to capture URL response time when using

I want to write three concurrent go routines that sends integers to each other. Now, my code is compiled properly, however after first execution it gives error "all goroutines are asleep - deadlock!". I tried to find the error but I could not able to find any error in code logic.Can anybody help me to find the mistake with my code. My code is given below. Thanks in advance. package main import "rand" func Routine1(command12 chan int, response12 chan int, command13 chan int, response13 chan int) { for i := 0; i < 10; i++ { y := rand.Intn(10) if y%2 == 0 { command12 <- y } if y%2 != 0 {

How do you delegate the running of a goroutine to another non administrator account on windows? I see you can do this on Linux using syscall.Setuid() . I can't see how to do this on Windows using the windows syscall package. I'd like to be able to set the account the goroutine runs under while the program is running. Is this possible? Bit of background :- I want to switch the user that runs the goroutine so I can change the OS User passed to Oracle during the database connection when I use go-oci8 (See my other question ). I need to connect to the database and it uses the logged in user (OS

I need to start a huge amount of goroutines and wait for their termination. The intuitive way seems to use a channel to wait till all of them are finished : package main type Object struct { //data } func (obj *Object) Update(channel chan int) { //update data channel <- 1 return } func main() { channel := make(chan int, n) list := make([]Object, n, m) for { for _, object := range list { go object.Update(channel) } for i := 0; i < n; i++ { <-channel } //now everything has been updated. start again } } But the problem is that the amount of objects and therefore the amount of goroutines could

Channels combine communication—the exchange of a value—with synchronization—guaranteeing that two calculations (goroutines) are in a known state. How is it possible to use the channels in Google Go to perform the functionality of mutex? package main import "sync" var global int = 0 var m sync.Mutex func thread1(){ m.Lock() global = 1 m.Unlock() } func thread2(){ m.Lock() global = 2 m.Unlock() } func main(){ go thread1() go thread2() } An example of using a Channel as a Mutex: package main var global int = 0 var c = make(chan int, 1) func thread1(){ <-c // Grab the ticket global = 1 c <- 1 //