[Bug 14697] OllyDbg 2.x freezes sometimes during processing of debug events (debug events can block completion of queued user APCs)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=14697

Sebastian Lackner <sebastian at fds-team.de> changed:

           What    |Removed                     |Added
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                 CC|                            |sebastian at fds-team.de

--- Comment #9 from Sebastian Lackner <sebastian at fds-team.de> ---
Created attachment 52592
  --> https://bugs.winehq.org/attachment.cgi?id=52592
Hack to disable interruptable waits for running threads

I haven't been able to reproduce this bug yet, but based on the description the
attached hack should help.

I assume processing system APCs inside of regular server_select() calls was
mainly implemented for performance reasons. However the whole idea seems to be
a bit broken by design. We cannot guarantee that an APC will run without
interruptions without blocking the signal or sending USR1. Blocking signals is
not possible because it would break suspending a thread during a wait. Manually
keeping track of the thread state also seems pretty complex. So the best idea I
would have would be to remove interruptible waits again, and just always use
USR1. :/

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