Abstract

The yeild() is a function to relinquish the CPU to make another task to use CPU. But in case of Arduino Uno, it dose nothing.

Source Code

The yield() is defined in hardware/arduino/avr/cores/arduino/hooks.c as below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13

/**
 * Empty yield() hook.
 *
 * This function is intended to be used by library writers to build
 * libraries or sketches that supports cooperative threads.
 *
 * Its defined as a weak symbol and it can be redefined to implement a
 * real cooperative scheduler.
 */
static void __empty() {
    // Empty
}
void yield(void) __attribute__ ((weak, alias("__empty")));

The yield() is defined as __empty() and the __empty() dose nothing.

The attribute is specified as weak, a user can redefine this function.

Version

Arduino AVR Boards 1.8.6

Last Update

March 21, 2023