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WeakMessageSend is broken?

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Aliaksei Syrel

WeakMessageSend is broken?

Assume we have the following weak message send:

message := WeakMessageSend
receiver: Morph new
selector: #color.
100000 timesRepeat: [ message value ]

If you execute it in latest Pharo and VM you will (almost 100% sure) get DNU. (but it should just return nil if receiver is garbage collected)

How can I ensure that it selector is not being sent to nil?

http://ws.stfx.eu/6QOWBLQENVIY

Am I doing something wrong?

Cheers,

Alex

stepharo

Re: WeakMessageSend is broken?

Hi aliaksei

I do not know. Now I know that last week guille was trying to understand memory leaks
and they all were around Weak structures

Stef

Le 28/3/16 21:08, Aliaksei Syrel a écrit :

Assume we have the following weak message send:

message := WeakMessageSend
receiver: Morph new
selector: #color.
100000 timesRepeat: [ message value ]

If you execute it in latest Pharo and VM you will (almost 100% sure) get DNU. (but it should just return nil if receiver is garbage collected)

How can I ensure that it selector is not being sent to nil?

http://ws.stfx.eu/6QOWBLQENVIY

Am I doing something wrong?

Cheers,
Alex

Aliaksei Syrel

Re: WeakMessageSend is broken?

Submitted an issue

https://pharo.fogbugz.com/f/cases/17906/WeakMessageSend-is-broken

Cheers,

Alex

On Mon, Mar 28, 2016 at 9:29 PM, stepharo <[hidden email]> wrote:

Hi aliaksei

I do not know. Now I know that last week guille was trying to understand memory leaks
and they all were around Weak structures

Stef

Le 28/3/16 21:08, Aliaksei Syrel a écrit :

Assume we have the following weak message send:

message := WeakMessageSend
receiver: Morph new
selector: #color.
100000 timesRepeat: [ message value ]

If you execute it in latest Pharo and VM you will (almost 100% sure) get DNU. (but it should just return nil if receiver is garbage collected)

How can I ensure that it selector is not being sent to nil?

http://ws.stfx.eu/6QOWBLQENVIY

Am I doing something wrong?

Cheers,
Alex

Aliaksei Syrel

Re: WeakMessageSend is broken?

In reply to this post by stepharo

I do not know. Now I know that last week guille was trying to understand memory leaks
and they all were around Weak structures

Without going forward and bugs there is no progress :)

Cheers,

Alex

On Mon, Mar 28, 2016 at 9:29 PM, stepharo <[hidden email]> wrote:

Hi aliaksei

I do not know. Now I know that last week guille was trying to understand memory leaks
and they all were around Weak structures

Stef

Le 28/3/16 21:08, Aliaksei Syrel a écrit :

Assume we have the following weak message send:

message := WeakMessageSend
receiver: Morph new
selector: #color.
100000 timesRepeat: [ message value ]

If you execute it in latest Pharo and VM you will (almost 100% sure) get DNU. (but it should just return nil if receiver is garbage collected)

How can I ensure that it selector is not being sent to nil?

http://ws.stfx.eu/6QOWBLQENVIY

Am I doing something wrong?

Cheers,
Alex