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Prevent concurrent multiple opens of leveldb database.

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Summary:
The fcntl call cannot detect lock conflicts when invoked multiple times
from the same thread.
Use a static lockedFile Set to record the paths that are locked.
A lockfile request checks to see if htis filename already exists in
lockedFiles, if so, then it triggers an error. Otherwise, it inserts
the filename in the lockedFiles Set.
A unlock file request verifies that the filename is in the lockedFiles
set and removes it from lockedFiles set.

Test Plan: unit test attached

Reviewers: heyongqiang

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D4755
This commit is contained in:
Dhruba Borthakur 2012-08-18 00:26:50 -07:00 committed by heyongqiang
parent f3ee54526f
commit d41316bc0f
1 changed files with 4 additions and 1 deletions
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5
Makefile
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@ -56,7 +56,6 @@ TESTS = \
write_batch_test \
filelock_test
TOOLS = \
manifest_dump \
leveldb_shell \
@ -198,6 +197,10 @@ sst_dump: tools/sst_dump.o $(LIBOBJECTS)
$(VERSIONFILE): build_detect_version
$(shell ./build_detect_platform build_config.mk)
filelock_test: util/filelock_test.o $(LIBOBJECTS) $(TESTHARNESS)
$(CXX) util/filelock_test.o $(LIBOBJECTS) $(TESTHARNESS) -o $@ $(LDFLAGS)
ifeq ($(PLATFORM), IOS)
# For iOS, create universal object files to be used on both the simulator and
# a device.