Number of Running Processes on a Minix system from C code

Question

So, this seemed simple at first, but after crawling Google and here, the answer doesn\'t seem as simple as I first thought.

Basically, I\'m editing a MINIX kernel as

Answer 1

If you're editing the kernel, the most efficient way to solve this problem is to maintain a count every time a process (i.e., a task_struct entry) is created (and make sure you decrement the count every where a process terminates).

You could always loop through the list of processes in the kernel using the built-in macro (but its expensive, so you should try to avoid it):

struct task_struct *p;
unsigned int count = 0;
for_each_process(task) {
    count++;
}