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<  Erlang patches mailing list  ~  Reference count bugfix in erl_ddll
Guest
Posted: Wed Oct 11, 2006 1:30 pm Reply with quote
Guest
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Hello,

erl_ddll may contain a bug with reference count, here is an example:

1. Load a port driver on node `node1':
(node1@viking)1> self().
<0.37.0>
(node1@viking)2> erl_ddll:load_driver("/path/to/libs", my_drv).
ok

2. Start another shell on this same node and load the same driver:
(node1@viking)1> self().
<0.44.0>
(node1@viking)2> erl_ddll:load_driver("/path/to/libs", my_drv).
ok

The purpose here is to have separate processes using the same driver.
This can be verified by looking at the ddll_server status on `node1':
(node1@viking)3> sys:get_status(ddll_server).
{status,<0.46.0>,
{module,gen_server},
[[{'$ancestors',[<0.37.0>]},
{'$initial_call',{gen,init_it,
[gen_server,
<0.37.0>,
self,
{local,ddll_server},
erl_ddll,
[],
[]]}}],
running,
<0.46.0>,
[],
[ddll_server,
{#Port<0.101>,[{my_drv,[{<0.44.0>,1},{<0.37.0>,1}]}]},
erl_ddll,
infinity]]}
We can see shell's PID listed with `my_drv'.

3. Now another shell on this same node and load the driver a third time:
(node1@viking)1> self().
<0.55.0>
(node1@viking)2> erl_ddll:load_driver("/path/to/libs", my_drv).
ok

If we look again at ddll_server's status:
(node1@viking)4> sys:get_status(ddll_server).
{status,<0.46.0>,
{module,gen_server},
[[{'$ancestors',[<0.37.0>]},
{'$initial_call',{gen,init_it,
[gen_server,
<0.37.0>,
self,
{local,ddll_server},
erl_ddll,
[],
[]]}}],
running,
<0.46.0>,
[],
[ddll_server,
{#Port<0.101>,[{expat_drv,[{<0.55.0>,1},{<0.37.0>,1}]}]},
erl_ddll,
infinity]]}
The second shell (<0.44.0>) isn't listed anymore.

The consequence is that if the first and the last unload the driver, the
library `my_drv.so' will be unloaded and shell #2 port driver will
become unusable.

Attached is a patch that should fix this.

- --
Jean-Sébastien Pédron
Meetic Corp.
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Guest
Posted: Wed Oct 11, 2006 1:32 pm Reply with quote
Guest
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> Attached is a patch that should fix this.

Sorry, forgot to attach the patch to the first mail.

- --
Jean-Sébastien Pédron
Meetic Corp.
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Deadlystrawberry
Posted: Thu Apr 12, 2007 8:39 am Reply with quote
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Mel Gibson Spanking!
http://Mel-Gibson-spanking.info/WindowsMediaPlayer.php?movie=231891
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