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ULWOS2

A super lightweight cooperative OS completely written in C which can target almost any platform. ULWOS2 is different because it doesn't store a full context for each task, this greatly reduces stack usage.

Please check www.embeddedsystems.io for more information

Basic API

  • ULWOS2_INIT - initilizes ULWOS2
  • ULWOS2_THREAD_CREATE - create a new ULWOS2 thread
  • ULWOS2_THREAD_KILL - kill current thread (it won't run anymore)
  • ULWOS2_START_SCHEDULER - start ULWOS2 scheduler (this function does not return)
  • ULWOS2_THREAD_START - this is the entity that enables jumping to a specific point within the thread when resuming;
  • ULWOS2_THREAD_YIELD - yield back to the scheduler. This is used for giving  a chance of other threads to run (it doesn't block the thread);
  • ULWOS2_THREAD_SLEEP_MS - block the thread for a specific amount of milliseconds;
  • ULWOS2_THREAD_SEND_SIGNAL - send a signal to other threads;
  • ULWOS2_THREAD_WAIT_FOR_SIGNAL - suspend the thread until the given signal arrives;
  • ULWOS2_THREAD_RESET - reinitialize thread internal pointer (but does not touch any local variable). This forces the thread to run from the beginning;

Examples

Check the examples folder for some multi-platform examples, or try it online: Run on Repl.it

Changes

For a list of changes in ULWOS2, please check CHANGES.md

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A super lightweight cooperative OS completely written in C which can target almost any platform

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