87ca079e49
When z_test_1cpu_start() is called to ensure that only a single CPU on an SMP system is available for use in a test, this commit will ensure that that CPU is the primary CPU--CPU0. This is done because some timer drivers only have the timer interrupt processed by one CPU. A bit of a song and dance is performed to achieve this without enabling the CPU mask/affinity pinning API. If the cpuhold thread is found to be executing on CPU0, then a new copy of cpuhold thread is created. Once the new copy is executing (incidentally guaranteed to be on another CPU) then it informs the original copy and busy waits until it the original copy is switched out of CPU0. At this point, we can create the next cpuhold thread to occupy another CPU if needed. During this song and dance, it is critical that the 'copy' not pend. If it pends, we can not guarantee which CPU it will execute on when it unpends. As the cpuhold threads have the highest priority, nothing is going to cause them to execute on another CPU for as long as they do not pend. Signed-off-by: Peter Mitsis <peter.mitsis@intel.com> |
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| .. | ||
| include/zephyr | ||
| src | ||
| CMakeLists.txt | ||
| Kconfig | ||