Tim Ellison wrote:
Geir Magnusson Jr. wrote:
Tim Ellison wrote:
At present, the Harmony launcher creates and passes an instance of the
portlib to the VM as it is being created (via an
_org.apache.harmony.vmi.portlib init arg). This is good because allows
the launcher to define functions used for memory alloc, file IO, etc.
early.
However, we also need to work with regular applications that are
embedding the JVM, and don't know/want to set up this argument for us.
In such a case the classlib should use a default portlib (and possibly
JVM subsequently if it wants).
This seems backwards to me. Wouldn't we want the VM use the default
portlib and give that to the classlib?
VMs that want to use the portlib can do that today anyway (e.g. drlvm
was creating the portlib itself), so this would allow setting the
portlib by the classlib where the VM doesn't care.
So today, the launcher creates a portlib and passes it in as a VM
property, and the VM stores the struct ptr in the VMI.
I'm suggesting that we allow any one of:
- VM takes the version passed in via the launcher property
- VM creates a default version and puts it in VMI
- classlib creates a default version and puts it in VMI
This makes sense to me - it gives the most flexibility for when the port
library
is created. If the launcher doesnt do it, fall back to the VM. If the VM
doesnt do it, fall back to the classlib default. It seems sensible to have
a failsafe in place, even if we never have to use it.
Regards,
Oliver
Regards,
Tim
I propose that we retain support for the init arg, but make it optional,
and that we extend the VMI [1] to allow setting the portlib struct where
it has not been previously defined. The portlib struct can only be
defined once, subsequent attempts to set the portlib would return an
error. Of course, you can still modify the struct to redefine the
functions it contains.
The new VMI function would be:
vmiError(JNICALL * SetPortLibrary)
(VMInterface * vmi, HyPortLibrary * portlib);
then the early logic in JNI_OnLoad for luniglob.c [2] would become:
(a) if vmInterface->GetPortLibrary(vmi) is not NULL then continue
(b) otherwise create new portlib, and vmi->SetPortlib(vmi, portlib).
and the corresponding JNI_OnUnload would destroy the portlib iff it had
been created in step (b).
[1]
http://svn.apache.org/viewvc/incubator/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/include/shared/vmi.h?revision=442941&view=markup
[2]
http://svn.apache.org/viewvc/incubator/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/luni/shared/luniglob.c?revision=442941&view=markup
Comments?
Regards,
Tim
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--
Oliver Deakin
IBM United Kingdom Limited
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