64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
#include "pid_manager.h"
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define MIN_PID 300
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#define MAX_PID 5000
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#define SIZE (MAX_PID - MIN_PID + 1)
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bool pids[SIZE];
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int allocate_map(void) {
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for (int i = 0; i < SIZE; i++) {
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pids[i] = false;
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}
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return 1;
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}
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int allocate_pid(void) {
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for (int i = 0; i < SIZE; i++) {
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if (!pids[i]) {
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pids[i] = true;
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return i + MIN_PID;
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}
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}
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return -1;
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}
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void release_pid(int pid) {
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if (pid >= MIN_PID && pid <= MAX_PID) {
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pids[pid - MIN_PID] = false;
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}
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}
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int main(void) {
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if (allocate_map() != 1) {
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perror("Failed to initialize PID Manager\n");
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exit(1);
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}
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for (int i = 0; i < SIZE; i++) {
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printf("Allocate PID = %d\n", allocate_pid());
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}
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int last = allocate_pid();
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printf("Attempt to allocate another PID, result %d\n", last);
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if (last == -1) {
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printf("Release a PID 4000\n");
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release_pid(4000);
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}
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printf("Allocate another PID: %d\n", allocate_pid());
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printf("Release PIDs 300 and 5000\n");
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release_pid(300);
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release_pid(5000);
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printf("Allocate another PID: %d\n", allocate_pid());
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printf("Allocate another PID: %d\n", allocate_pid());
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return 0;
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}
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