The following code snippet is from the entry function of a task. There are other tasks whose priorities are unknown. What best describes the value of suspended_time at the end of this code snippet?tick1 = osKernelGetTickCount();osDelay(1000);tick2 = osKernelGetTickCount();suspended_time = tick2 - tick1;*= 1000 + computation time of this task>= 1000= 1000<= 1000
Question
The following code snippet is from the entry function of a task. There are other tasks whose priorities are unknown. What best describes the value of suspended_time at the end of this code snippet?tick1 = osKernelGetTickCount();osDelay(1000);tick2 = osKernelGetTickCount();suspended_time = tick2 - tick1;*= 1000 + computation time of this task>= 1000= 1000<= 1000
Solution
The value of suspended_time at the end of this code snippet would be >= 1000.
Here's the step-by-step explanation:
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tick1 = osKernelGetTickCount();This line gets the current tick count of the operating system's kernel and assigns it totick1. The tick count is a measure of time, with each tick typically representing one millisecond. -
osDelay(1000);This line causes the task to wait for 1000 ticks (or milliseconds). During this time, the task is not running. -
tick2 = osKernelGetTickCount();This line gets the current tick count again, after the delay, and assigns it totick2. -
suspended_time = tick2 - tick1;This line calculates the difference between the two tick counts, which represents the total time that has passed during the delay and assigns it tosuspended_time.
Since the task was delayed for 1000 ticks, and then some amount of time passed to execute the lines of code, the total time (suspended_time) is at least 1000. If other tasks with higher priorities were running during this time, they could have caused additional delay, making suspended_time even larger. Therefore, suspended_time is >= 1000.
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