6e41d6cdb7
SingletonPtr's implementation wasn't totally safe - see "C++ and the Perils of Double-Checked Locking"by Meyers and Alexandrescu. No problems observed in practice, but it was potentially susceptible to compiler optimisation (or maybe even SMP issues). Now that we have atomic loads and stores, the function can be made safe, avoiding any potential races for threads that don't take the lock: ensure that the unlocked load is atomic, and that the pointer store is atomic. See https://preshing.com/20130930/double-checked-locking-is-fixed-in-cpp11/ for more discussion. |
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README.md
Arm Mbed OS is an open source embedded operating system designed specifically for the "things" in the Internet of Things. It includes all the features you need to develop a connected product based on an Arm Cortex-M microcontroller, including security, connectivity, an RTOS and drivers for sensors and I/O devices.
Mbed OS provides a platform that includes:
- Security foundations.
- Cloud management services.
- Drivers for sensors, I/O devices and connectivity.
Release notes
The release notes detail the current release. You can also find information about previous versions.
License and contributions
The software is provided under Apache-2.0 license. Contributions to this project are accepted under the same license. Please see contributing.md for more info.
This project contains code from other projects. The original license text is included in those source files. They must comply with our license guide
Getting started for developers
We have a developer website for asking questions, engaging with others, finding information on boards and components, using an online IDE and compiler, reading the documentation and learning about what's new and what's coming next in Mbed OS.
Getting started for contributors
We also have a contributing and publishing guide that covers licensing, contributor agreements and style guidelines.
Documentation
For more information about Mbed OS, please see our published documentation. It includes Doxygen for our APIs, step-by-step tutorials, porting information and background reference materials about our architecture and tools.
To contribute to this documentation, please see the mbed-os-5-docs repository.