Fix Windows implementation of PGSemaphoreLock.
The original coding failed to reset ImmediateInterruptOK before returning,
which would potentially allow a subsequent query-cancel interrupt to be
accepted at an unsafe point. This is a really nasty bug since it's so hard
to predict the consequences, but they could be unpleasant.
Also, ensure that signal handlers are serviced before this function
returns, even if the semaphore is already set. This should make the
behavior more like Unix.
Back-patch to all supported versions.
Branch
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REL8_4_STABLE
Details
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http://git.postgresql.org/pg/commitdiff/de48dbade3930522dd33446b84dcc5407bec7f72
Modified Files
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src/backend/port/win32_sema.c | 20 ++++++++++++--------
1 files changed, 12 insertions(+), 8 deletions(-)