Can golang functions directly access global variables in goroutine?
May 01, 2024 pm 05:51 PM
Yes, Go functions in Goroutine can directly access global variables by default. Reason: A Goroutine inherits the memory space of the Goroutine that created it, including access to global variables.
#Can Go functions directly access global variables in Goroutine?
In Go, a goroutine is a function executed by a lightweight thread. When a goroutine is created, it inherits the memory space of the goroutine that created it, including access to global variables. Therefore, by default, goroutines can access global variables directly.
Example:
package main
var globalVariable = 0
func main() {
// 創(chuàng)建一個(gè) goroutine
go func() {
// Goroutine 可以直接訪問(wèn)全局變量
globalVariable += 1
fmt.Println("Goroutine:", globalVariable)
}()
// 在主 goroutine 中修改全局變量
globalVariable += 1
fmt.Println("Main goroutine:", globalVariable)
}In the above example, we created a global variable globalVariable. Then, we create a goroutine and modify the value of globalVariable. Finally, we print the value of globalVariable, and the result is as follows:
Goroutine: 1 Main goroutine: 2
This shows that goroutine can directly access and modify global variables.
Note:
Although goroutine can directly access global variables, this approach is not always safe. If multiple goroutines access and modify the same global variable at the same time, data races and other problems may result. To avoid these problems, consider using mutexes or other concurrency control mechanisms to synchronize access to global variables.
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