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c312a2eaf1
esp_yield() now also calls esp_schedule(), original esp_yield() function renamed to esp_suspend(). Don't use delay(0) in the Core internals, libraries and examples. Use yield() when the code is supposed to be called from CONT, use esp_yield() when the code can be called from either CONT or SYS. Clean-up esp_yield() and esp_schedule() declarations across the code and use coredecls.h instead. Implement helper functions for libraries that were previously using esp_yield(), esp_schedule() and esp_delay() directly to wait for certain SYS context tasks to complete. Correctly use esp_delay() for timeouts, make sure scheduled functions have a chance to run (e.g. LwIP_Ethernet uses recurrent) Related issues: - #6107 - discussion about the esp_yield() and esp_delay() usage in ClientContext - #6212 - discussion about replacing delay() with a blocking loop - #6680 - pull request introducing LwIP-based Ethernet - #7146 - discussion that originated UART code changes - #7969 - proposal to remove delay(0) from the example code - #8291 - discussion related to the run_scheduled_recurrent_functions() usage in LwIP Ethernet - #8317 - yieldUntil() implementation, similar to the esp_delay() overload with a timeout and a 0 interval