100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package main
|
|
|
|
import "C"
|
|
import (
|
|
"fmt"
|
|
"runtime"
|
|
"time"
|
|
|
|
"git.wow.st/gmp/nswrap/examples/gc/ns"
|
|
)
|
|
|
|
func releaseX(x int) func (ns.MyClassSupermethods) {
|
|
return func(super ns.MyClassSupermethods) {
|
|
//fmt.Printf("--release %d\n", x)
|
|
super.Release() // comment out for leak
|
|
}
|
|
}
|
|
func memtest1() {
|
|
fmt.Println("memtest1 started")
|
|
for {
|
|
arr := make([]ns.MyClass,1000)
|
|
for i := 0; i < 1000; i++ {
|
|
// Alloc methods set a finalizer that causes the Go GC to
|
|
// Release these objects.
|
|
arr[i] = ns.MyClassAlloc()
|
|
arr[i].ReleaseCallback(releaseX(i))
|
|
|
|
// You can still manually retain objects, but that will cause
|
|
// them to stick around after their Go pointers are collected.
|
|
// This may be necessary if you are adding objects to an
|
|
// Objective-C collection?
|
|
//arr[i].Retain() // uncomment for leak
|
|
}
|
|
// Manually run the Go GC at every loop iteration. May not be needed
|
|
// in a real program.
|
|
runtime.GC()
|
|
time.Sleep(time.Second/50)
|
|
fmt.Printf("Loop complete\n")
|
|
}
|
|
}
|
|
|
|
func memtest2() {
|
|
fmt.Println("memtest2 started")
|
|
for {
|
|
o1 := ns.NSStringAlloc().InitWithGoString("one string")
|
|
|
|
// NSWrap runs object constructors inside an @autoreleasepool block,
|
|
// and then calls "retain" on them before returning to Go. A Go
|
|
// finalizer is set allowing the Go GC to call Release().
|
|
|
|
o2 := ns.NSStringWithGoString("two string") // does not leak
|
|
|
|
arr := ns.NSArrayWithObjects(o1,o2)
|
|
_ = arr
|
|
|
|
runtime.GC()
|
|
time.Sleep(time.Second/50)
|
|
}
|
|
}
|
|
|
|
func addStr(arr ns.NSMutableArray) {
|
|
s1 := ns.NSStringAlloc().InitWithGoString("a string")
|
|
arr.AddObject(s1)
|
|
|
|
// s1 should be eligible for Go garbage collection here, but is still referenced
|
|
// on the Objective-C side. By adding s1 to an array, the array automatically
|
|
// calls 'retain' on the underlying Objective-C string.
|
|
}
|
|
|
|
func memtest3() {
|
|
fmt.Println("memtest3 started")
|
|
|
|
arr := ns.NSMutableArrayAlloc().Init() // arr will be garbage collected by Go
|
|
addStr(arr)
|
|
runtime.GC()
|
|
time.Sleep(time.Second)
|
|
s1 := arr.ObjectAtIndex(0)
|
|
fmt.Println(s1.NSString().UTF8String())
|
|
fmt.Println("memtest3 done")
|
|
}
|
|
|
|
func memtest4() {
|
|
fmt.Println("memtest4 started")
|
|
for {
|
|
o1 := ns.NSStringAlloc().InitWithGoString("four string")
|
|
c1 := o1.UTF8String()
|
|
_ = o1
|
|
_ = c1
|
|
time.Sleep(time.Second/10)
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
go memtest1()
|
|
go memtest2()
|
|
go memtest3()
|
|
go memtest4()
|
|
select {}
|
|
}
|