try to solve android arch

[Milerius]

cc @kpango trying to fix #41 #31

[mratsim]

Doesn't go have something similar to C++ alignas? https://en.cppreference.com/w/cpp/language/alignas

I'm surprised Go atomics aren't aligned automatically to the underlying size.

Assuming Go atomatically aligns trivial types to their size, yes this will ensure 64-bit alignment.

However from a performance point of view, you might want to separate atomics by about a cacheline (64-byte) for those accessed by multiple threads to avoid false sharing.

[Milerius]

Doesn't go have something similar to C++ alignas? https://en.cppreference.com/w/cpp/language/alignas

I'm surprised Go atomics aren't aligned automatically to the underlying size.

Assuming Go atomatically aligns trivial types to their size, yes this will ensure 64-bit alignment.

However from a performance point of view, you might want to separate atomics by about a cacheline (64-byte) for those accessed by multiple threads to avoid false sharing.

https://golang.org/pkg/sync/atomic/#pkg-note-BUG it seems that's is a known bug

[kpango]

@Milerius Thank you for the PR. I would love to incorporate this fix if it solves the long standing problem .
Have you tested this on an Android device?
I don't have an Android device on hand, so I can't test it.

[kpango]

time.Duration is also int64 type I think it's better to write like this

	uut           uint32
	uunt          uint32
	ut            int64
	unt           int64
	dur           int64
	correctionDur time.Duration
	running       *atomic.Value
	t             *atomic.Value
	ft            *atomic.Value
	format        *atomic.Value
	cancel        context.CancelFunc

[Milerius]

@Milerius Thank you for the PR. I would love to incorporate this fix if it solves the long standing problem .
Have you tested this on an Android device?
I don't have an Android device on hand, so I can't test it.

Hmm I would like an advice how to use this patched version of glg in my program to test my fix also kpango/glg#107 seems to break android compatibility, good things is you can test this local fix by compiling for ARM and use qemu to launch example, but for android i need a way to build glg with my patch

[Milerius]

Something you can try @kpango is:

install android studio.

Compile your module with gomobile bind -v --target=android .

and import it in android studio as mentionned in: https://medium.com/@LogPacker/gomobile-library-development-for-ios-android-8711e76817d8

You do not need any android device because there is a simulator

https://go101.org/article/memory-layout.html

[kpango]

Thanks for providing the verification method, I guess I need to release it for Dependency to try it on Android, I'll keep the Issue and merge this PR and release Patch for glg as well.
I'll contact you about it, can you verify it for me?