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fixes and enhancements around logfile usage #27

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@rglarix rglarix commented Mar 9, 2017

This patch series adds:

  • a fix against a deadlock during logfile close
  • a fix for a use after delete of logfile FILE pointer
  • the log file is now opened in shared read mode, allowing in-progress peeks of the file content

Closing the report file (done under options lock) triggers memory operation,
and a deadlock in multithreaded programs, because callstack was also accessing
the options variable using locking.
This patch removes locks around callstack option access, like the existing
showInternalFrames parameter.
It can lead to a (harmless) data race, but no longer to a deadlock
Since dumping memory can be slow, this patch allows read access from other programs during write (e.g. notepad)
vld report writer maintans a private copy of output FILE pointer.
After closing it, we need to notify the report writer.
src/callstack.cpp Outdated Show resolved Hide resolved
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