rocksdb/port
Andrew Kryczka 791bff5b4e Prevent deadlock in db_stress with DbStressCompactionFilter (#8956)
Summary:
The cyclic dependency was:

- `StressTest::OperateDb()` locks the mutex for key 'k'
- `StressTest::OperateDb()` calls a function like `PauseBackgroundWork()`, which waits for pending compaction to complete.
- The pending compaction reaches key `k` and `DbStressCompactionFilter::FilterV2()` calls `Lock()` on that key's mutex, which hangs forever.

The cycle can be broken by using a new function, `port::Mutex::TryLock()`, which returns immediately upon failure to acquire a lock. In that case `DbStressCompactionFilter::FilterV2()` can just decide to keep the key.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8956

Reviewed By: riversand963

Differential Revision: D31183718

Pulled By: ajkr

fbshipit-source-id: 329e4a31ce43085af174cf367ef560b5a04399c5
2021-09-24 16:54:02 -07:00
..
win Prevent deadlock in db_stress with DbStressCompactionFilter (#8956) 2021-09-24 16:54:02 -07:00
README reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
jemalloc_helper.h jemalloc_helper: Limit the mm_malloc.h hack to glibc on linux (#8425) 2021-06-29 08:40:02 -07:00
lang.h Standardize on GCC for TSAN conditional compilation (#8543) 2021-07-15 23:50:00 -07:00
likely.h Support pragma once in all header files and cleanup some warnings (#4339) 2018-09-05 18:13:31 -07:00
malloc.h Charge block cache for cache internal usage (#5797) 2019-09-16 15:26:21 -07:00
port.h Change RocksDB License 2017-07-15 16:11:23 -07:00
port_dirent.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
port_example.h Replace most typedef with using= (#8751) 2021-09-07 11:31:59 -07:00
port_posix.cc Prevent deadlock in db_stress with DbStressCompactionFilter (#8956) 2021-09-24 16:54:02 -07:00
port_posix.h Prevent deadlock in db_stress with DbStressCompactionFilter (#8956) 2021-09-24 16:54:02 -07:00
stack_trace.cc Standardize on GCC for TSAN conditional compilation (#8543) 2021-07-15 23:50:00 -07:00
stack_trace.h Fault injection in db_stress (#6538) 2020-04-10 17:21:26 -07:00
sys_time.h Replace most typedef with using= (#8751) 2021-09-07 11:31:59 -07:00
util_logger.h Move some logging related files to logging/ (#5387) 2019-05-31 17:23:59 -07:00
xpress.h Change RocksDB License 2017-07-15 16:11:23 -07:00

README

This directory contains interfaces and implementations that isolate the
rest of the package from platform details.

Code in the rest of the package includes "port.h" from this directory.
"port.h" in turn includes a platform specific "port_<platform>.h" file
that provides the platform specific implementation.

See port_posix.h for an example of what must be provided in a platform
specific header file.