Discussion
A handler and a task share this flag, on a 32-bit core.
volatile uint32_t flag = 0;
/* handler */ flag = 1;
/* task */ if (flag) { flag = 0; handle(); }The arrangement is
Answer: D
An interrupt falling between the test and the assignment sets the flag and the task then clears it without handling that second event. A semaphore or a notification counts the events instead of merely recording that at least one occurred, which is why they exist.
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