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Inside the idle loop, in some configuration, IRQ is unlocked and then immediately locked again. There is a side effect: 1. IRQ is unlocked in middle of the loop. 2. Another thread (A) can now run so idle thread is un-scheduled. 3. Thread A runs to its end and going through the thread self-abort path. 4. Idle thread is rescheduled again, and continues to run the remaining loop when it eventuall calls k_cpu_idle(). The "pending abort" path is not being executed on thread A at this point. 5. Now, thread A is suspended, and the CPU is in idle waiting for interrupts (e.g. timeouts). 6. Thread B is waiting to join on thread A. Since thread A has not been terminated yet so thread B is waiting until the idle thread runs again and starts executing from the beginning of while loop. 7. Depending on how many threads are running and how active the platform is, idle thread may not run again for a while, resulting in thread B appearing to be stuck. To avoid this situation, the unlock/lock pair in middle of the loop is removed so no rescheduling can be done mid-loop. When there is no thread abort pending, it simply locks IRQ and calls k_cpu_idle(). This is almost identical to the idle loop before the thread abort code was introduced (except the check for cpu->pending_abort). Fixes #30573 Signed-off-by: Daniel Leung <daniel.leung@intel.com> |
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| .. | ||
| include | ||
| atomic_c.c | ||
| banner.c | ||
| cache_handlers.c | ||
| CMakeLists.txt | ||
| compiler_stack_protect.c | ||
| device.c | ||
| errno.c | ||
| fatal.c | ||
| futex.c | ||
| idle.c | ||
| init.c | ||
| Kconfig | ||
| kheap.c | ||
| mailbox.c | ||
| mem_domain.c | ||
| mem_slab.c | ||
| mempool.c | ||
| mmu.c | ||
| msg_q.c | ||
| mutex.c | ||
| pipes.c | ||
| poll.c | ||
| queue.c | ||
| sched.c | ||
| sem.c | ||
| smp.c | ||
| stack.c | ||
| system_work_q.c | ||
| thread_abort.c | ||
| thread.c | ||
| timeout.c | ||
| timer.c | ||
| userspace_handler.c | ||
| userspace.c | ||
| version.c | ||
| work_q.c | ||
| xip.c | ||