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bikeshed
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Lock free hierarchical work scheduler
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|Branch | OSX / Linux / Windows | |------------|-----------------------| |master | [](https://travis-ci.org/DanEngelbrecht/bikeshed?branch=master) | |master | [](https://app.codacy.com/app/DanEngelbrecht/bikeshed?utm_source=github.com&utm_medium=referral&utm_content=DanEngelbrecht/bikeshed&utm_campaign=Badge_Grade_Dashboard) | # bikeshed Lock free hierarchical work scheduler Builds with MSVC, Clang and GCC, header only, C99 compliant, MIT license. See github for latest version: https://github.com/DanEngelbrecht/bikeshed See design blogs at: https://danengelbrecht.github.io ## Version history ### Version v1.0 29/5 2019 **Release 1.0** ### Fixes - Use explicit int32_t for instead of long to ensure 32-bit values on GCC/Clang x64-builds - Corrected URL to blog in README.md - Added sample code for performance tests (in examples folder) ### Version v0.4 18/5 2019 **Pre-release 4** ### API changes - Bikeshed_AddDependencies to take array of parent task task_ids - Bikeshed_ReadyCallback now gets called per channel range ### API additions - Bikeshed_FreeTasks - BIKESHED_L1CACHE_SIZE to control ready head alignement - no padding/alignement added by default - BIKESHED_CPU_YIELD to control yielding in high-contention scenarios ### Fixes - Added default (non-atomic) implementations for helper for unsupported platforms/compilers - Codacy analisys and badge - More input validation on public apis when BIKESHED_ASSERTS is enabled - Batch allocation of task indexes - Batch allocation of dependency indexes - Batch free of task indexes - Batch free of dependency indexes - Fixed broken channel range detection when resolving dependencies ### Version v0.3 1/5 2019 **Pre-release 3** #### Fixes - Ready callback is now called when a task is readied via dependency resolve - Tasks are readied in batch when possible ### Version v0.2 29/4 2019 **Pre-release 2** #### Fixes - Internal cleanups - Fixed warnings and removed clang warning suppressions - `-Wno-sign-conversion` - `-Wno-unused-macros` - `-Wno-c++98-compat` - `-Wno-implicit-fallthrough` - Made it compile cleanly with clang++ on Windows ### Version v0.1 26/4 2019 **Pre-release 1** ## Features - Generic tasks scheduling with dependecies between tasks - Each task has zero or many dependecies (as defined by user) - User should Ready any tasks that can execute (has zero dependencies) - Automatic ready of tasks that reaches zero dependecies - Automatic free of tasks that has completed - A task can have many parents and many child dependecies - Task channels - execute tasks based on task channel - No memory allocations once shed is created - Minimal dependencies - Memory allocation and threading are users responsability - Lifetime of data associated with tasks is users responsability - Configurable and optional assert (fatal error) behavior - Configurable platform dependant functions with default implementation provided - Header only - define `BIKESHED_IMPLEMENTATION` in one compilation unit and include `bikeshed.h` ## Non-features - Cyclic dependency detection and resolving - API is designed to help user avoid cyclic dependecies but does not do any analisys - Built in threading or syncronization code - API to add it is available - Unlimited number of active tasks - currently limited to 8 388 607 *active* tasks - Cancelling of tasks - Tagging of tasks ## Dependencies Minimal dependecies with default overridable method for atomic operations. - `<stdint.h>` - `<string.h>` - The default (optional) MSVC implementation depends on `<Windows.h>`. ### Optional default methods The default implementations for the atomic and CPU yield functions can be overridden with your own implementation by overriding the macros: - `BIKESHED_ATOMICADD` Atomically adds a 32-bit signed integer to another 32-bit signed integer and returns the result - `BIKESHED_ATOMICCAS` Atomically exchange a 32-bit signed integer with another 32-bit signed integer if the value to be swapped matches the provided compare value, returns the old value. - `BIKESHED_CPU_YIELD` Yield CPU (mm_pause() / YieldProcessor()). ## Test code dependecies Test code has dependencies added as drop-in headers from - https://github.com/JCash/jctest for unit test validation Test code has dependencies added as git sub-modules from - https://github.com/DanEngelbrecht/nadir for threading and syncronization
