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Topic created on: August 30, 2006 21:20 CDT by pedram .

Anyone ever seen CreateToolhelp32Snapshot() deadlock (ie: not return) when attempting to take a module snapshot (TH32CS_SNAPMODULE)?

EliCZ		August 31, 2006 03:59.08 CDT
Yes. SNAPMODULE is on 2K implemented via remote threads (and waiting for them infinitely) into processes. On XP+ is SNAPMODULE made softly as via PSAPI but SNAPHEAPLIST is still done via r.t.. So, not-yet-initialized processes can be effectively crashed and for processes where some thread owns loader lock must caller wait. And there are poorly written things like cygwin1.dll that remains inside its DllMain(process_attach) forever, so any r.t. or apc get never chance to execute. Caller has to wait for the process as long as it exists (or can kill it).

pedram		August 31, 2006 12:52.26 CDT
EliCZ: Thanks! Really good to know. I was indeed in a 2k VM when this happened, which explains why I never saw it before.

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