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