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atomic.LoadUintptr() Function in Golang With Examples
  • Last Updated : 01 Apr, 2020

In Go language, atomic packages supply lower-level atomic memory that is helpful is implementing synchronization algorithms. The LoadUintptr() function in Go language is used to atomically load *addr. This function is defined under the atomic package. Here, you need to import “sync/atomic” package in order to use these functions.

Syntax:

func LoadUintptr(addr *uintptr) (val uintptr)

Here, addr indicates address.

Note: (*uintptr) is the pointer to a uintptr value. And uintptr is an integer type that is too large that it can contain the bit pattern of any pointer.

Return value: It returns the value loaded to the *addr.



Example 1:

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// Program to illustrate the usage of
// LoadUintptr function in Golang
  
// Including main package
package main
  
// importing fmt and sync/atomic
import (
    "fmt"
    "sync/atomic"
)
  
// Main function
func main() {
  
    // Assigning values
    // to the uintptr
    var (
        i uintptr = 98
        j uintptr = 255
        k uintptr = 6576567667788
        l uintptr = 5
    )
  
    // Calling LoadUintptr method
    // with its parameters
    load_1 := atomic.LoadUintptr(&i)
    load_2 := atomic.LoadUintptr(&j)
    load_3 := atomic.LoadUintptr(&k)
    load_4 := atomic.LoadUintptr(&l)
  
    // Displays uintptr value
    // loaded in the *addr
    fmt.Println(load_1)
    fmt.Println(load_2)
    fmt.Println(load_3)
    fmt.Println(load_4)
}

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Output:

98
255
6576567667788
5

Example 2:

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// Program to illustrate the usage of
// LoadUintptr function in Golang
  
// Including main package
package main
  
// Importing fmt and sync/atomic
import (
    "fmt"
    "sync/atomic"
)
  
// Main function
func main() {
  
    // Declaring u
    var u uintptr
  
    // For loop
    for i := 1; i < 1000; i += 1 {
  
        // Function with
        // AddUintptr method
        go func() {
            atomic.AddUintptr(&u, 9)
        }()
    }
  
    // Prints loaded values address
    fmt.Println(atomic.LoadUintptr(&u))
}

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Output:

1818   // A random value is returned in each run

In the above example, the new values are returned from AddUintptr() method in each call until the loop stops, LoadUintptr() method loads these new uintptr values. And these values are stored in different addresses which can be random one so, the output of the LoadUintptr() method here in each run is different. So, here a random value is returned in the output.




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