When running a shell app twice, I ran into an interesting problem: global
variables that had initializers were not initialized to the defaults specified
in the source. Running the same shell app under the old NT32 seems to work. It
turns out that the shell app was not being reloaded, but rather being
relaunched. I deduced this from the following behavior:
1. The value of the global variables was the same as the last known value
from the previous invocation.
2. The following line in WinHost.c was returning the exact same value for
the DLL being loaded
Library = LoadLibraryEx (DllFileName, NULL, DONT_RESOLVE_DLL_REFERENCES);
(around line 901)
3. The corresponding code in Nt32’s PeCoffExtractionLib had the following
lines in PeCoffLoaderUnloadImageExtraAction
VOID *ModHandle;
ASSERT (ImageContext != NULL);
ModHandle = RemoveModeHandle (ImageContext);
if (ModHandle != NULL) {
mWinNt->FreeLibrary (ModHandle);
}
However, the same function in EmulatorPkg’s WinHost.c has:
ASSERT (ImageContext != NULL);
So it appears that the DLL is never being unloaded and the subsequent
invocation of the shell app uses the same instance of the DLL, leaving the
global variables with the previous values. There are two related functions:
AddModHandle and RemoveModHandle.
Am I missing something? Or heading in the right direction?
Thanks,
Tim
From: devel@edk2.groups.io <devel@edk2.groups.io>
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