Add doxygen docs

Author: zielinsky

analyzer.c

@@ -1,5 +1,11 @@
+/// @file analyzer.c
 #include "analyzer.h"
 
+/**
+ * Calculates avarage cpu usage.
+ * @param[in] prev
+ * @param[out] avarage_cpu_usage
+ */
 static unsigned long average_cpu_usage(struct proc_stat prev,
                                        struct proc_stat current) {
   unsigned long prevIdle = prev.idle + prev.iowait;

cputracker.c

@@ -1,3 +1,4 @@
+/// @file cputracker.c
 #include "cputracker.h"
 #include "analyzer.h"
 #include "printer.h"

cputracker.h

@@ -1,3 +1,4 @@
+/// @file cputracker.h
 #ifndef CPUTRACKER_H
 #define CPUTRACKER_H
 
@@ -18,24 +19,30 @@
 #define TIMEOUT 2
 #define THREADS 3
 
-enum State {Reader = 0, Printer = 1, Analyzer = 2};
+/**
+ * @brief Enum with Threads id
+ */
+enum Ids {Reader = 0, Printer = 1, Analyzer = 2};
 
+/**
+ * @brief Struct for /proc/stats info.
+ */
 struct proc_stat {
   char name[256];
-  unsigned long user, // Time spent with normal processing in user mode.
-      nice,           // Time spent with niced processes in user mode.
-      system,         // Time spent running in kernel mode.
-      idle,           // Time spent in vacations twiddling thumbs.
-      iowait,     // Time spent waiting for I/O to completed. This is considered
-                  // idle time too.
-      irq,        // Time spent serving hardware interrupts.
-      softirq,    // Time spent serving software interrupts.
-      steal,      // Time stolen by other operating systems running in a virtual
-                  // environment.
-      guest,      // Time spent for running a virtual CPU or guest OS under the
-                  // control of the kernel.
-      guest_nice; // Time spent running a niced guest (virtual CPU for guest
-                  // operating systems under the control of the Linux kernel).
+  unsigned long user, /**< Time spent with normal processing in user mode.*/
+      nice,           /**< Time spent with niced processes in user mode.*/
+      system,         /**< Time spent running in kernel mode.*/
+      idle,           /**< Time spent in vacations twiddling thumbs.*/
+      iowait,     /**< Time spent waiting for I/O to completed. This is considered
+                  idle time too.*/
+      irq,        /**< Time spent serving hardware interrupts.*/
+      softirq,    /**< Time spent serving software interrupts.*/
+      steal,      /**< Time stolen by other operating systems running in a virtual
+                  environment.*/
+      guest,      /**< Time spent for running a virtual CPU or guest OS under the
+                  control of the kernel.*/
+      guest_nice; /**< Time spent running a niced guest (virtual CPU for guest
+                  operating systems under the control of the Linux kernel).*/
 };