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1、<p> 計算機與通信工程學院</p><p><b> 操作系統(tǒng)課程設計</b></p><p> 設計題目 Linux頁面換入換出分析、 進程管理器</p><p><b> 課程設計任務書</b></p><p> 設計題目:Linux頁面換入換出分析、進程管理器
2、</p><p><b> 一、設計實驗條件</b></p><p> Ubuntu Kylin 16.04, Visual Studio 2015</p><p><b> 二、設計任務及要求</b></p><p> 必做題目:Linux頁面換入換出分析。</p><
3、p> 要求:分析Linux內核對頁面換入換出地實現。說明主要函數的功能及相互間地調用關系。畫出換入換出流程圖,并用文字加以說明。</p><p> 選作題目:進程管理器</p><p> 設計任務:在Linux或Windows系統(tǒng)環(huán)境下,實現一個系統(tǒng)進程管理器,能夠顯示當前系統(tǒng)的活動進程信息(進程名、用戶、優(yōu)先級、內存使用等),并能結束或創(chuàng)建特定進程??蓞⒖糤indows下“任
4、務管理器”功能。</p><p><b> 三、設計報告的內容</b></p><p><b> 設計題目與設計任務</b></p><p> Linux頁面換入換出分析</p><p> 要求:分析Linux內核對頁面換入換出地實現。說明主要函數的功能及相互間地調用關系。畫出換入換出流程圖
5、,并用文字加以說明。</p><p><b> 進程管理器</b></p><p> 設計任務:在Linux或Windows系統(tǒng)環(huán)境下,實現一個系統(tǒng)進程管理器,能夠顯示當前系統(tǒng)的活動進程信息(進程名、用戶、優(yōu)先級、內存使用等),并能結束或創(chuàng)建特定進程??蓞⒖糤indows下“任務管理器”功能。</p><p><b> 前言&l
6、t;/b></p><p> Linux頁面換入換出分析</p><p> 目的與意義:深入理解Linux內核中換入換出的操作,對操作系統(tǒng)虛擬存儲器操作有進一步認識。</p><p><b> 進程管理器</b></p><p> 目的與意義:深入理解操作系統(tǒng)進程管理的原理</p><p
7、><b> 設計主體</b></p><p> Linux頁面換入換出分析</p><p><b> 換出的流程圖:</b></p><p><b> 圖中的相關代碼:</b></p><p> ==================== mm/vmscan.c
8、1146 1153 ====================</p><p> 1146 static int __init kswapd_init(void)</p><p><b> 1147 {</b></p><p> 1148 printk("Starting kswapd v1.8\n");</
9、p><p> 1149 swap_setup();</p><p> 1150 kernel_thread(kswapd, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGNAL);</p><p> 1151 kernel_thread(kreclaimd, NULL, CLONE_FS | CLONE_FILE
10、S | CLONE_SIGNAL);</p><p> 1152 return 0;</p><p><b> 1153 }</b></p><p> ==================== mm/swap.c 293 305 ====================</p><p> [kswapd_i
11、nit()>swap_setup()]</p><p><b> 293 /*</b></p><p> 294 * Perform any setup for the swap system</p><p><b> 295 */</b></p><p> 296 voi
12、d __init swap_setup(void)</p><p><b> 297 {</b></p><p> 298 /* Use a smaller cluster for memory <16MB or <32MB */</p><p> 299 if (num_physpages < ((1
13、6 * 1024 * 1024) >> PAGE_SHIFT))</p><p> 300 page_cluster = 2;</p><p> 301 else if (num_physpages < ((32 * 1024 * 1024) >> PAGE_SHIFT))</p><p> 302
14、 page_cluster = 3;</p><p> 303 else</p><p> 304 page_cluster = 4;</p><p><b> 305 }</b></p><p> ==================== mm/vmscan.c 1146 11
15、53 ====================</p><p> 1146 static int __init kswapd_init(void)</p><p><b> 1147 {</b></p><p> 1148 printk("Starting kswapd v1.8\n");</p>
16、<p> 1149 swap_setup();</p><p> 1150 kernel_thread(kswapd, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGNAL);</p><p> 1151 kernel_thread(kreclaimd, NULL, CLONE_FS | CLONE_FILES | CLO
17、NE_SIGNAL);</p><p> 1152 return 0;</p><p><b> 1153 }</b></p><p> ==================== mm/swap.c 293 305 ====================</p><p> [kswapd_init()&g
18、t;swap_setup()]</p><p><b> 293 /*</b></p><p> 294 * Perform any setup for the swap system</p><p><b> 295 */</b></p><p> 296 void __ini
19、t swap_setup(void)</p><p><b> 297 {</b></p><p> 298 /* Use a smaller cluster for memory <16MB or <32MB */</p><p> 299 if (num_physpages < ((16 * 102
20、4 * 1024) >> PAGE_SHIFT))</p><p> 300 page_cluster = 2;</p><p> 301 else if (num_physpages < ((32 * 1024 * 1024) >> PAGE_SHIFT))</p><p> 302 pa
21、ge_cluster = 3;</p><p> 303 else</p><p> 304 page_cluster = 4;</p><p><b> 305 }</b></p><p> ==================== mm/vmscan.c 805 822 ======
22、==============</p><p> [kswapd()>inactive_shortage()]</p><p><b> 805 /*</b></p><p> 806 * How many inactive pages are we short?</p><p><b> 8
23、07 */</b></p><p> 808 int inactive_shortage(void)</p><p><b> 809 {</b></p><p> 810 int shortage = 0;</p><p><b> 811</b></p&
24、gt;<p> 812 shortage += freepages.high;</p><p> 813 shortage += inactive_target;</p><p> 814 shortage -= nr_free_pages();</p><p> 815 shortage -= nr_inact
25、ive_clean_pages();</p><p> 816 shortage -= nr_inactive_dirty_pages;</p><p><b> 817</b></p><p> 818 if (shortage > 0)</p><p> 819 retu
26、rn shortage;</p><p><b> 820</b></p><p> 821 return 0;</p><p><b> 822 }</b></p><p> ==================== mm/vmscan.c 907 941 ===========
27、=========</p><p> [kswapd()>do_try_to_free_pages()]</p><p> 907 static int do_try_to_free_pages(unsigned int gfp_mask, int user)</p><p><b> 908 {</b></p>
28、<p> 909 int ret = 0;</p><p><b> 910</b></p><p> 911 /*</p><p> 912 * If we‘re low on free pages, move pages from the</p><p> 913
29、* inactive_dirty list to the inactive_clean list.</p><p><b> 914 *</b></p><p> 915 * Usually bdflush will have pre-cleaned the pages</p><p> 916 * before
30、we get around to moving them to the other</p><p> 917 * list, so this is a relatively cheap operation.</p><p> 918 */</p><p> 919 if (free_shortage() || nr_inactive_d
31、irty_pages > nr_free_pages() +</p><p> 920 nr_inactive_clean_pages())</p><p> 921 ret += page_launder(gfp_mask, user);</p><p><b> 922</b></p
32、><p> 923 /*</p><p> 924 * If needed, we move pages from the active list</p><p> 925 * to the inactive list. We also "eat" pages from</p><p> 926
33、 * the inode and dentry cache whenever we do this.</p><p> 927 */</p><p> 928 if (free_shortage() || inactive_shortage()) {</p><p> 929 shrink_dcache_memory(6
34、, gfp_mask);</p><p> 930 shrink_icache_memory(6, gfp_mask);</p><p> 931 ret += refill_inactive(gfp_mask, user);</p><p> 932 } else {</p><p> 933
35、 /*</p><p> 934 * Reclaim unused slab cache memory.</p><p> 935 */</p><p> 936 kmem_cache_reap(gfp_mask);</p><p> 937 ret =
36、1;</p><p><b> 938 }</b></p><p><b> 939</b></p><p> 940 return ret;</p><p><b> 941 }</b></p><p> =========
37、=========== mm/vmscan.c 465 670 ====================</p><p> [kswapd()>do_try_to_free_pages()>page_launder()]</p><p><b> 465 /**</b></p><p> 466 * page_laund
38、er - clean dirty inactive pages, move to inactive_clean list</p><p> 467 * @gfp_mask: what operations we are allowed to do</p><p> 468 * @sync: should we wait synchronously for the cleanin
39、g of pages</p><p><b> 469 *</b></p><p> 470 * When this function is called, we are most likely low on free +</p><p> 471 * inactive_clean pages. Since we want t
40、o refill those pages as</p><p> 472 * soon as possible, we‘ll make two loops over the inactive list,</p><p> 473 * one to move the already cleaned pages to the inactive_clean lists</p&g
41、t;<p> 474 * and one to (often asynchronously) clean the dirty inactive pages.</p><p><b> 475 *</b></p><p> 476 * In situations where kswapd cannot keep up, user proc
42、esses will</p><p> 477 * end up calling this function. Since the user process needs to</p><p> 478 * have a page before it can continue with its allocation, we‘ll</p><p> 479
43、 * do synchronous page flushing in that case.</p><p><b> 480 *</b></p><p> 481 * This code is heavily inspired by the FreeBSD source code. Thanks</p><p> 482
44、* go out to Matthew Dillon.</p><p><b> 483 */</b></p><p> 484 #define MAX_LAUNDER (4 * (1 << page_cluster))</p><p> 485 int page_launder(int gfp_mask, int s
45、ync)</p><p><b> 486 {</b></p><p> 487 int launder_loop, maxscan, cleaned_pages, maxlaunder;</p><p> 488 int can_get_io_locks;</p><p> 489 s
46、truct list_head * page_lru;</p><p> 490 struct page * page;</p><p><b> 491</b></p><p> 492 /*</p><p> 493 * We can only grab the IO locks (e
47、g. for flushing dirty</p><p> 494 * buffers to disk) if __GFP_IO is set.</p><p> 495 */</p><p> 496 can_get_io_locks = gfp_mask & __GFP_IO;</p><p>&l
48、t;b> 497</b></p><p> 498 launder_loop = 0;</p><p> 499 maxlaunder = 0;</p><p> 500 cleaned_pages = 0;</p><p><b> 501</b></p>
49、<p> 502 dirty_page_rescan:</p><p> 503 spin_lock(&pagemap_lru_lock);</p><p> 504 maxscan = nr_inactive_dirty_pages;</p><p> 505 while ((page_lru = inact
50、ive_dirty_list.prev) != &inactive_dirty_list &&</p><p> 506 maxscan-- > 0) {</p><p> 507 page = list_entry(page_lru, struct page, lru);</p><p>&
51、lt;b> 508</b></p><p> 509 /* Wrong page on list?! (list corruption, should not happen) */</p><p> 510 if (!PageInactiveDirty(page)) {</p><p> 511
52、 printk("VM: page_launder, wrong page on list.\n");</p><p> 512 list_del(page_lru);</p><p> 513 nr_inactive_dirty_pages--;</p><p> 514
53、 page->zone->inactive_dirty_pages--;</p><p> 515 continue;</p><p> 516 }</p><p><b> 517</b></p><p> 518 /* Page
54、 is or was in use? Move it to the active list. */</p><p> 519 if (PageTestandClearReferenced(page) || page->age > 0 ||</p><p> 520 (!page->buffers &&
55、page_count(page) > 1) ||</p><p> 521 page_ramdisk(page)) {</p><p> 522 del_page_from_inactive_dirty_list(page);</p><p> 523 add_page_to
56、_active_list(page);</p><p> 524 continue;</p><p> 525 }</p><p><b> 526</b></p><p> 527 /*</p><p> 528
57、* The page is locked. IO in progress?</p><p> 529 * Move it to the back of the list.</p><p> 530 */</p><p> 531 if (TryLockPage(page)) {</p><p&
58、gt; 532 list_del(page_lru);</p><p> 533 list_add(page_lru, &inactive_dirty_list);</p><p> 534 continue;</p><p> 535 }</p>
59、<p><b> 536</b></p><p> 537 /*</p><p> 538 * Dirty swap-cache page? Write it out if</p><p> 539 * last copy..</p><p> 540
60、 */</p><p> 541 if (PageDirty(page)) {</p><p> 542 int (*writepage)(struct page *) = page->mapping->a_ops->writepage;</p><p> 543
61、int result;</p><p><b> 544</b></p><p> 545 if (!writepage)</p><p> 546 goto page_active;</p><p><b> 547</b></
62、p><p> 548 /* First time through? Move it to the back of the list */</p><p> 549 if (!launder_loop) {</p><p> 550 list_del(page_lru);</p&g
63、t;<p> 551 list_add(page_lru, &inactive_dirty_list);</p><p> 552 UnlockPage(page);</p><p> 553 continue;</p><p> 554
64、 }</p><p><b> 555</b></p><p> 556 /* OK, do a physical asynchronous write to swap. */</p><p> 557 ClearPageDirty(page);</p>
65、<p> 558 page_cache_get(page);</p><p> 559 spin_unlock(&pagemap_lru_lock);</p><p><b> 560</b></p><p> 561 result = write
66、page(page);</p><p> 562 page_cache_release(page);</p><p><b> 563</b></p><p> 564 /* And re-start the thing.. */</p><p> 565
67、 spin_lock(&pagemap_lru_lock);</p><p> 566 if (result != 1)</p><p> 567 continue;</p><p> 568 /* writepage refused to do anythi
68、ng */</p><p> 569 set_page_dirty(page);</p><p> 570 goto page_active;</p><p> 571 }</p><p><b> 572</b></p><p&
69、gt; 573 /*</p><p> 574 * If the page has buffers, try to free the buffer mappings</p><p> 575 * associated with this page. If we succeed we either free</p><
70、p> 576 * the page (in case it was a buffercache only page) or we</p><p> 577 * move the page to the inactive_clean list.</p><p> 578 *</p><p> 579
71、 * On the first round, we should free all previously cleaned</p><p> 580 * buffer pages</p><p> 581 */</p><p> 582 if (page->buffers) {</p>
72、<p> 583 int wait, clearedbuf;</p><p> 584 int freed_page = 0;</p><p> 585 /*</p><p> 586 * Since we might be doing disk IO,
73、 we have to</p><p> 587 * drop the spinlock and take an extra reference</p><p> 588 * on the page so it doesn‘t go away from under us.</p><p> 589
74、 */</p><p> 590 del_page_from_inactive_dirty_list(page);</p><p> 591 page_cache_get(page);</p><p> 592 spin_unlock(&pagemap_lru_lock);
75、</p><p><b> 593</b></p><p> 594 /* Will we do (asynchronous) IO? */</p><p> 595 if (launder_loop && maxlaunder == 0 && sync)&l
76、t;/p><p> 596 wait = 2; /* Synchrounous IO */</p><p> 597 else if (launder_loop && maxlaunder-- > 0)</p><p> 598 wait = 1; /*
77、Async IO */</p><p> 599 else</p><p> 600 wait = 0; /* No IO */</p><p><b> 601</b></p><p> 602 /* Try to free the
78、 page buffers. */</p><p> 603 clearedbuf = try_to_free_buffers(page, wait);</p><p><b> 604</b></p><p> 605 /*</p><p> 606
79、 * Re-take the spinlock. Note that we cannot</p><p> 607 * unlock the page yet since we‘re still</p><p> 608 * accessing the page_struct here...</p><p&g
80、t; 609 */</p><p> 610 spin_lock(&pagemap_lru_lock);</p><p><b> 611</b></p><p> 612 /* The buffers were not freed. */</p>
81、;<p> 613 if (!clearedbuf) {</p><p> 614 add_page_to_inactive_dirty_list(page);</p><p><b> 615</b></p><p> 616 /* The
82、page was only in the buffer cache. */</p><p> 617 } else if (!page->mapping) {</p><p> 618 atomic_dec(&buffermem_pages);</p><p> 619
83、 freed_page = 1;</p><p> 620 cleaned_pages++;</p><p><b> 621</b></p><p> 622 /* The page has more users besides the cache and us. */&
84、lt;/p><p> 623 } else if (page_count(page) > 2) {</p><p> 624 add_page_to_active_list(page);</p><p><b> 625</b></p><p> 626
85、 /* OK, we "created" a freeable page. */</p><p> 627 } else /* page->mapping && page_count(page) == 2 */ {</p><p> 628 add_page_to_i
86、nactive_clean_list(page);</p><p> 629 cleaned_pages++;</p><p> 630 }</p><p><b> 631</b></p><p> 632 /*</p>
87、<p> 633 * Unlock the page and drop the extra reference.</p><p> 634 * We can only do it here because we ar accessing</p><p> 635 * the page struct
88、above.</p><p> 636 */</p><p> 637 UnlockPage(page);</p><p> 638 page_cache_release(page);</p><p><b> 639</b></p&g
89、t;<p> 640 /*</p><p> 641 * If we‘re freeing buffer cache pages, stop when</p><p> 642 * we‘ve got enough free memory.</p><p> 643
90、 */</p><p> 644 if (freed_page && !free_shortage())</p><p> 645 break;</p><p> 646 continue;</p><p> 647
91、 } else if (page->mapping && !PageDirty(page)) {</p><p> 648 /*</p><p> 649 * If a page had an extra reference in</p><p> 650 *
92、 deactivate_page(), we will find it here.</p><p> 651 * Now the page is really freeable, so we</p><p> 652 * move it to the inactive_clean list.</p><p> 6
93、53 */</p><p> 654 del_page_from_inactive_dirty_list(page);</p><p> 655 add_page_to_inactive_clean_list(page);</p><p> 656 UnlockPa
94、ge(page);</p><p> 657 leaned_pages++;</p><p> 658 } else {</p><p> 659 page_active:</p><p> 660 /*</p><p>
95、 661 * OK, we don‘t know what to do with the page.</p><p> 662 * It‘s no use keeping it here, so we move it to</p><p> 663 * the active list.</p><
96、;p> 664 */</p><p> 665 del_page_from_inactive_dirty_list(page);</p><p> 666 add_page_to_active_list(page);</p><p> 667 UnlockP
97、age(page);</p><p> 668 }</p><p><b> 669 }</b></p><p> 670 spin_unlock(&pagemap_lru_lock);</p><p> ==================== mm/vmscan.c 6
98、71 697 ====================</p><p> [kswapd()>do_try_to_free_pages()>page_launder()]</p><p><b> 671</b></p><p> 672 /*</p><p> 673 * If we
99、 don‘t have enough free pages, we loop back once</p><p> 674 * to queue the dirty pages for writeout. When we were called</p><p> 675 * by a user process (that /needs/ a free page) and
100、 we didn‘t</p><p> 676 * free anything yet, we wait synchronously on the writeout of</p><p> 677 * MAX_SYNC_LAUNDER pages.</p><p><b> 678 *</b></p>
101、<p> 679 * We also wake up bdflush, since bdflush should, under most</p><p> 680 * loads, flush out the dirty pages before we have to wait on</p><p> 681 * IO.</p>&l
102、t;p> 682 */</p><p> 683 if (can_get_io_locks && !launder_loop && free_shortage()) {</p><p> 684 launder_loop = 1;</p><p> 685 /* If we
103、 cleaned pages, never do synchronous IO. */</p><p> 686 if (cleaned_pages)</p><p> 687 sync = 0;</p><p> 688 * We only do a few "out of order&quo
104、t; flushes. */</p><p> 689 maxlaunder = MAX_LAUNDER;</p><p> 690 /* Kflushd takes care of the rest. */</p><p> 691 wakeup_bdflush(0);</p><p>
105、 692 goto dirty_page_rescan;</p><p><b> 693 }</b></p><p><b> 694</b></p><p> 695 /* Return the number of pages moved to the inactive_clea
106、n list. */</p><p> 696 return cleaned_pages;</p><p><b> 697 }</b></p><p><b> 換入的流程圖:</b></p><p><b> 相關代碼:</b></p>&l
107、t;p><b> /* </b></p><p> * These routines also need to handle stuff like marking pages dirty </p><p> * and/or accessed for architectures that don't do it in hardware (mos
108、t </p><p> * RISC architectures). The early dirtying is also good on the i386. </p><p><b> * </b></p><p> * There is also a hook called "update_mmu_cache()&q
109、uot; that architectures </p><p> * with external mmu caches can use to update those (ie the Sparc or </p><p> * PowerPC hashed page tables that act as extended TLBs). </p><p>&
110、lt;b> * </b></p><p> * We enter with non-exclusive mmap_sem (to exclude vma changes, </p><p> * but allow concurrent faults), and pte mapped but not yet locked. </p><p&
111、gt; * We return with pte unmapped and unlocked. </p><p><b> * </b></p><p> * The mmap_sem may have been released depending on flags and our </p><p> * return valu
112、e. See filemap_fault() and __lock_page_or_retry(). </p><p><b> */ </b></p><p> static int handle_pte_fault(struct mm_struct *mm, </p><p> struct vm_area_struct *v
113、ma, unsigned long address, </p><p> pte_t *pte, pmd_t *pmd, unsigned int flags) </p><p><b> { </b></p><p> pte_t entry; </p><p> spinlock_t *ptl; &
114、lt;/p><p><b> /* </b></p><p> * some architectures can have larger ptes than wordsize, </p><p> * e.g.ppc44x-defconfig has CONFIG_PTE_64BIT=y and CONFIG_32BIT=y, <
115、/p><p> * so READ_ONCE or ACCESS_ONCE cannot guarantee atomic accesses. </p><p> * The code below just needs a consistent view for the ifs and </p><p> * we later double check any
116、way with the ptl lock held. So here </p><p> * a barrier will do. </p><p><b> */ </b></p><p> entry = *pte; </p><p> barrier(); </p><p&g
117、t; if (!pte_present(entry)) { </p><p> if (pte_none(entry)) { </p><p> if (vma->vm_ops) </p><p> return do_fault(mm, vma, address, pte, pmd, </p><p> flags,
118、 entry); </p><p> return do_anonymous_page(mm, vma, address, pte, pmd, </p><p><b> flags); </b></p><p><b> } </b></p><p> return do_swap
119、_page(mm, vma, address, </p><p> pte, pmd, flags, entry); </p><p><b> } </b></p><p><b> 進程管理器</b></p><p><b> 軟件功能:</b></p&
120、gt;<p> 1)顯示當前系統(tǒng)所有的進程,并提供刷新操作</p><p> 2)可以結束當前選定進程</p><p><b> 3)打開系統(tǒng)記事本</b></p><p><b> 軟件截圖演示:</b></p><p><b> 1)顯示</b>&l
121、t;/p><p><b> 2)打開記事本</b></p><p> 3)找到notepad并結束進程</p><p><b> 源碼重要部分分析:</b></p><p> private void Window_Loaded(object sender, RoutedEventArgs e)
122、 //窗體啟動時運行的代碼</p><p><b> {</b></p><p> processes = System.Diagnostics.Process.GetProcesses();//獲得系統(tǒng)全部進程</p><p> this.textBlock1.Text = "進程任務管理器,這里顯示所有的系統(tǒng)進程,共&quo
123、t; + processes.Length + "個進程";</p><p> processesCollection.Clear();//清除之前的進程Collection記錄</p><p> foreach (System.Diagnostics.Process eachProcess in processes)</p><p><
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