> On Nov 27, 2014, at 3:13 AM, David Cox <david....@autologic.com> wrote:
>
> Hi,
>
> Are library constructors invoked once as part of image initialise? And if so
> are they always invoked on every boot warm/cold etc.?
>
Yes the library constructors are invoked as part of the image initialization.
The entry point of the image is a symbols called _ModuleEntryPoint. The
_ModuleEntryPoint is part of a special library that calls the library
constructors and then the entry point for the driver.
Here is the entry point library used for UEFI drivers:
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Library/UefiDriverEntryPoint/
<https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdePkg/Library/UefiDriverEntryPoint/>
it calls routines that are auto generated by the build system and end up in
the AutoGen.c file.
Thanks,
Andrew Fish
> Or are library constructors invoked every time a user component starts using
> the library? Like C++ constructors, an instance?
>
> Example Inf:
>
> [Defines]
> …
> CONSTRUCTOR = CustomizedDisplayLibConstructor
>
> …
>
> I am looking to initialise a variable once per boot to N and right now N will
> be 0. Since I want that variable used by everyone using the library I
> created a static global. If I leave it as a static in my library - Is this
> enough? Assuming I want 0.
>
> static UINT32 gFlag=0;
>
> Or should I initialise it in constructor?
>
> EFI_STATUS
> EFIAPI
> CustomizedDisplayLibConstructor (
> IN EFI_HANDLE ImageHandle,
> IN EFI_SYSTEM_TABLE *SystemTable
> ) {
> // …
> gFlag=0;
> // …
> }
>
> Alternative, perhaps I could use event OnReadyToBoot via
> EfiCreateEventReadyToBootEx(…). However I am unsure when in boot time this
> event is signalled.
>
> Right now I am counting function invokes as part of debugging.
>
> Regards,
>
> Dave Cox
>
> David Cox
> Senior Software Engineer
> Autologic Diagnostics Ltd
> Tel: +44 1865 870050
> Mobile:
> Fax: +44 1865 870051
> Email: david....@autologic.com <mailto:david....@autologic.com>
> Website: www.autologic.com <http://www.autologic.com/>
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