BDE 3.32.0: Production Release¶

Schedule¶

The BDE team is pleased to announce that the BDE 3.32.0 production release was completed on Monday, June 24, 2019

BDE 3.32.0 Highlights¶

`bslmt::Condition` No Longer Supports Windows XP: Performance Gains Expected¶

Historically, BDE provided a Windows XP-compatible implementation of bslmt::Condition. In this release, BDE replaces that implementation with one that uses the Windows native condition variable. As Windows XP lacks a native condition variable, this upgrade ends Windows XP compatibility.

This new implementation is expected to have better performance in all use cases.

New Components: `bslmt::ThroughputBenchmark*` for multi-threaded performance testing¶

bslmt::ThroughputBenchmark and the accompanying bslmt::ThroughputBenchmarkResult provide performance testing for multi-threaded components. The user specifies which function to run, and on how many threads. Several functions (say readers and writers) can run at the same time. The test is repeated multiple times, and the results can be mined for median and other percentiles (such as min and max). The user can simulate additional load interleaved with the function being run (for example, when testing a queue push and pop, simulate a load representing what is being done with the popped element).

New Component: `bdlcc::BoundedQueue`¶

bdlcc::BoundedQueue provides a new bounded queue implementation with an improved interface, temporal performance improvements, and memory use reduction for bsl::is_trivially_copyable classes over bdlcc::FixedQueue.

New Component: `bdlcc::SingleProducerSingleConsumerBoundedQueue`¶

bdlcc::SingleProducerSingleConsumerBoundedQueue provides a new type of queue with significant temporal performance improvements over bdlcc::FixedQueue in the SPSC use case.

New Package: `bsla` for Cross-platform Compiler Annotations¶

This release introduces a new package bsla that supersedes the existing bsls_annotation component, providing macros that (on supported platforms) expand into compiler supported annotations (e.g., BSLA_NORETURN, expands to “[[ noreturn ]]” on supporting compilers). On platforms where a compiler annotation is not supported, the macros in bsla expand to nothing. Note that this package was introduced to provide shorter macro names than those in bsls_annotation (e.g., BSLA_NORETURN instead of BSLS_ANNOTATION_NORETURN).

Fixed requests: 3.32.0¶

Summary
`bsla_annotations.h` – Add abbreviated macros for standardized keywords
Create `bslmt_throughputbenchmark`
Create a separate, binary package with `BSL_OVERRIDES_STD` headers
Migrate `bslmt_conditionimpl_win32` to native windows condition variables
Create `bdlcc_boundedqueue`
Create `bdlcc_singleproducersingleconsumerboundedqueue`
`SingleProducerQueue`: `NumElements` not fully synchronized
Clean all `bdx` test driver compile warnings
Reduce `bdlcc` intermittant timing failures in NB