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comparison driver/procfs/processes.c @ 0:42f240cc4bc6

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From: 太田 篤志 <atoc@namikilab.tuat.ac.jp>
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Tue, 08 Sep 2009 13:44:18 +0900
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-1:000000000000 0:42f240cc4bc6
1 /**
2 * processes.c
3 * SPE プロセスマネージャ spe_manager
4 * procfs エントリ "processes" のハンドラ
5 */
6
7 #include <linux/module.h> // カーネルモジュール全般
8 #include <linux/kernel.h> // printk
9 #include <linux/semaphore.h> // down_interruptible, up
10 #include <linux/spinlock.h> // spin_lock, spin_unlock
11
12 #include "../main.h"
13 #include "../critical.h"
14 #include "../process_list.h"
15 #include "processes.h"
16
17
18
19 //============================================================================================== procfs_processes_read()
20 /**
21 * procfs_processes_read
22 * procfs エントリ "processes" の read イベントハンドラ
23 *
24 * @param char * page
25 * @param char ** start
26 * @param off_t off
27 * @param int count
28 * @param int * eof
29 * @param void * data
30 * @return int
31 */
32 int procfs_processes_read(char *page, char **start, off_t off, int count, int *eof, void *data)
33 {
34 int opened, written, waiting, running, not_released, released;
35 struct semaphore *semaphore_for_process_list = get_semaphore_for_process_list();
36 spinlock_t *spinlock_for_process_list = get_spinlock_for_process_list();
37
38
39 // Critical Section (semaphore) >>>
40 if (down_interruptible(semaphore_for_process_list))
41 goto procfs_processes_read__error1;
42
43 // 各 SPE プロセス状態のプロセス数を取得 (セマフォをロックするだけで取得可能なもの)
44 opened = get_process_count_opened();
45 written = get_process_count_written();
46 released = get_process_count_released();
47
48 // Critical Section (spinlock) >>>
49 spin_lock(spinlock_for_process_list);
50 {
51 // 各 SPE プロセス状態のプロセス数を取得 (スピンロックも行わないと取得できないもの)
52 waiting = get_process_count_waiting();
53 running = get_process_count_running();
54 not_released = get_process_count_not_released();
55 }
56 spin_unlock(spinlock_for_process_list);
57 // <<< Critical Section (spinlock)
58
59 up(semaphore_for_process_list);
60 // <<< Critical Section (semaphore)
61
62
63 // プロセス数情報を出力する
64 *eof = 1;
65 return sprintf (
66 page,
67 " Processes \n"
68 "-------------------------\n"
69 " Opened %9d\n"
70 " Written %9d\n"
71 " Waiting %9d\n"
72 " Running %9d\n"
73 " Not Released %9d\n"
74 " Released %9d\n"
75 "-------------------------\n"
76 " Total %9d\n",
77 opened, written, waiting, running, not_released, released,
78 opened + written + waiting + running + not_released + released // Total
79 );
80
81
82 procfs_processes_read__error1:
83 return -ERESTARTSYS;
84 }