tracing-mutex/CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

Fixed

• std::sync wrappers now no longer incorrectly require T: Sized

0.3.1

Added

• On Rust 1.80 or newer, a wrapper for std::sync::LazyLock is now available. The MSRV has not been changed; older versions simply don't get this wrapper.

• Added missing const-initialisation wrappers for parking_lot. The API interface for tracing_mutex::parkinglot is now identical to parking_lot, and an example showing how to use it as a drop-in replacement was added.

• Introduced experimental feature, which will be used going forward to help evolve the API outside the normal stability guarantees. APIs under this feature are not subject to semver or MSRV guarantees.

• Added experimental api tracing_mutex::util::reset_dependencies, which can be used to reset the ordering information of a specific mutex when you need to reorder them. This API is unsafe, as its use invalidates any of the deadlock prevention guarantees made.

Changed

• Reworked CI to better test continued support for the minimum supported Rust version

Fixed

• Support for parking_lot and lock_api can now be enabled properly with the matching feature names.

Deprecated

• The parkinglot and lockapi features have been deprecated. They will be removed in version 0.4. To fix it, you can use the parking_lot and lock_api features respectively.

0.3.0 - 2023-09-09

Added

• The minimum supported Rust version is now defined as 1.70. Previously it was undefined.
• Wrappers for std::sync primitives can now be const constructed.
• Add support for std::sync::OnceLock
• Added backtraces of mutex allocations to the cycle report. Capturing backtraces does incur some overhead, this can be mitigated by disabling the backtraces feature which is enabled by default.

Breaking

• Update parking_lot dependency to 0.12.
• Restructured the crate to reduce typename verbosity. Wrapper names now match the name of the primitive they wrap. Specific always/debug tracing versions have now moved to separate modules. For example, tracing_mutex::stdsync::TracingMutex is now tracing_mutex::stdsync::tracing::Mutex, and tracing_mutex::stdsync::DebugMutex is now called tracing_mutex::stdsync::Mutex. This hopefully reduces the visual noise while reading code that uses this in practice. Unwrapped primitives are reexported under tracing_mutex::stdsync::raw for convenience.

Fixed

• Enforce that all internal mutex guards are !Send. They already should be according to other reasons, but this adds extra security through the type system.

0.2.1 - 2022-05-23

Added

• Build docs.rs documentation with all features enabled for completeness.
• Add support for std::sync::Condvar

Fixed

• The parkinglot module is now correctly enabled by the parkinglot feature rather than the lockapi feature.

0.2.0 - 2022-05-07

Added

• Generic support for wrapping mutexes that implement the traits provided by the lock_api crate. This can be used for creating support for other mutex providers that implement it.

• Support for parking_lot mutexes. Support includes type aliases for all provided mutex types as well as a dedicated Once wrapper.

• Simple benchmark to track the rough performance penalty incurred by dependency tracking.

Breaking

• The library now requires edition 2021.

• The Mutex- and RwLockGuards now dereference to T rather than the lock guard they wrap. This is technically a bugfix but can theoretically break existing code.

• Self-cycles are no longer allowed for lock dependencies. They previously were because it usually isn't a problem, but it can create RWR deadlocks with RwLocks.

Changed

• The project now targets edition 2021

0.1.2 - 2021-05-27

Added

• Added missing type aliases for the guards returned by DebugMutex and DebugRwLock. These new type aliases function the same as the ones they belong to, resolving to either the tracing versions when debug assertions are enabled or the standard one when they're not.

Fixed

• Fixed a corruption error where deallocating a previously cyclic mutex could result in a panic.

0.1.1 - 2021-05-24

Changed

• New data structure for interal dependency graph, resulting in quicker graph updates.

Fixed

• Fixed an issue where internal graph ordering indices were exponential rather than sequential. This caused the available IDs to run out way more quickly than intended.

0.1.0 - 2021-05-16 [YANKED]

Initial release.