{"id":196,"date":"2010-04-18T00:26:59","date_gmt":"2010-04-18T09:26:59","guid":{"rendered":"\/blog\/?p=196"},"modified":"2023-09-21T09:39:12","modified_gmt":"2023-09-21T00:39:12","slug":"ddk-using-rules-of-spinlock","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=196","title":{"rendered":"[DDK] Using rules of SpinLock"},"content":{"rendered":"\n\uc2a4\ud540 \ub77d\uc740 \ucc38 \uc624\ubb18\ud55c \ubb38\uc81c\uc774\ub2e4. \ud558\uc9c0\ub9cc \uc54c\uace0 \ubcf4\uba74 \uac04\ub2e8\ud55c \ub85c\uc9c1\uc73c\ub85c \ud574\uacb0\ud560 \uc218 \uc788\ub2e4!!

 \uc77c\ub2e8 \ub3d9\uae30\ud654 \ubb38\uc81c\uc5d0 \uc9c1\uba74\ud558\uac8c \ub418\uba74, ( \uba40\ud2f0 \n\ud504\ub85c\uc138\uc11c )

\uc6b0\ub9ac\uac00 \uc775\ud788 \uc54c\uace0 \uc788\ub294 \uc138\ub9c8\ud3ec\uc5b4(Semaphore)\uac19\uc740 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud574\uc11c \ub77d\ud0b9(Locking)\uc744 \n\ud574\uc57c\ud55c\ub2e4.

\uc774\uac83\uc744 \uc81c\ub300\ub85c \ud574\uc8fc\uc9c0 \uc54a\ub294\ub2e4\uba74 \ub370\ub4dc\ub77d(DeadLock)<\/font>\uc5d0 \n\ube60\uc9c0\uac8c\ub41c\ub2e4.

 \ub370\ub4dc\ub77d\uc740 \uc6b4\uc601\uccb4\uc81c\ub54c \ub4e4\uc5c8\uc744 \uac83\uc774\ub2e4.

\uc5ec\ub7ec \uc2a4\ub808\ub4dc\uac00 \uc784\uacc4\uc601\uc5ed(Critical Section)\uc5d0 \ub4e4\uc5b4\uac00\uae30 \n\uc704\ud574\uc11c,

\uacbd\uc7c1\uc744 \ud560 \uac83\uc774\ub2e4.

 \ud558\ub098\uc758 \uc2a4\ub808\ub4dc\uac00 \uc2a4\ud540\ub77d\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\uc744 \uacbd\uc6b0 \uc2a4\ud540 \ub77d\uc744 \uc0ac\uc6a9\ud558\uace0\uc790 \ud558\ub294 \ub2e4\ub978 \uc2a4\ub808\ub4dc\uac00 \n

\uc2a4\ud540 \ub77d\uc744 \uc0ac\uc6a9\ud558\uae30 \uc704\ud574 \uc2a4\ud540 \ub77d\uc744 \uc18c\uc720\ud558\uace0 \uc788\ub294 \uc2a4\ub808\ub4dc\uac00 \ud574\uc81c\ud560 \ub54c\uae4c\uc9c0 \uc5b4\ub5a4 \ub3d9\uc791\ub3c4 \uc2e4\ud589\ud558\uc9c0 \uc54a\ub294 \uac83\uc744

\ube44\uc9c0 \uc6e8\uc774\ud305(Busy-Waiting)<\/font> \uc0c1\ud0dc\ub77c \ud55c\ub2e4.

 \ub124\ud2b8\uc6cc\ud06c\uc5d0\uc11c Selecting \uc774\ub098 \nPolling \ubc29\uc2dd\ub3c4 Busywaiting\uc5d0 \uc18d\ud55c\ub2e4. while loop\uac00 Cpu\ub97c \uc810\uc720\ud558\uac8c \ub41c\ub2e4.

\ub098\uc911\uc5d0 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158\uacfc \ub4dc\ub77c\uc774\ubc84\uac00 \n\uc2dc\uadf8\ub110\uc744 \uc8fc\uace0 \ubc1b\uc744\ub54c, \ub2e4\uc2dc Busy waiting\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcfc \uac83\uc774\ub2e4.

 \uc774\uc81c \uc815\ud655\ud55c \uc0ac\uc6a9 \uaddc\uce59\uc744 \uc54c\uc544 \n\ubcf4\uc790,!

 \uc77c\ub2e8 \uc2a4\ud540 \ub77d\uc740 \ubc18\ub4dc\uc2dc \ub514\uc2a4\ud328\uce58 \ub808\ubca8(DISPATCH_LEVEL)\uc774\ub098 \uadf8 \n\uc544\ub798(PASSIVE_LEVEL, APC_LEVEL)

\uc758 IRQL\uc5d0\uc11c\ub9cc \uc694\uccad<\/font>\ud560 \uc218 \uc788\ub2e4.

 \ub2e4\uc74c\ubc88\uc5d0\ub294 \nIRQL\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcfc \uac83\uc778\ub370, \uc21c\uc11c\uac00 \ub4a4\ubc14\ub080 \uac10\ub3c4 \uc788\uae34\ud558\ub2e4,,;

 \uadf8\ub9ac\uace0 \ubaa8\ub4e0 \uc2a4\ud540 \ub77d\uc740 \uc790\uc2e0\uc758 IRQL\uc744 \uac00\uc9c0\uace0 \uc788\uace0, \uc774 \nIRQL\uc740 \uc801\uc5b4\ub3c4 \ub514\uc2a4\ud328\uce58 \ub808\ubca8\ubcf4\ub2e4 \ub192\uc9c0 \uc54a\uc544\uc57c \ud558\uae30

\ub54c\ubb38\uc5d0 \ub514\uc2a4\ud328\uce58 \ub808\ubca8\uc774 \uc2a4\ud540 \ub77d\uc744 \n\uc5bb\uae30 \uc704\ud55c \uac00\uc7a5 \ub192\uc740 IRQL\uc5d0 \ud574\ub2f9<\/u><\/font>\ud55c\ub2e4.
 
 \uc774\ub54c \uadf8 IRQL\uc744 \ub192\uc5ec \uc8fc\ub294 \ubc29\ubc95\uc774 \uc788\uc744 \uc218\uac00 \uc788\ub2e4. \ub514\uc2a4\ud328\uce58 \n\ub808\ubca8\ub85c \uc62c\ub824\uc8fc\uba74\uc11c \uc2e4\ud589\ud560 \uc218 \ub3c4\uc788\ub294\ub370,
 
KeAcquireInterruptSpinLock() \ud568\uc218\ub97c \uc0ac\uc6a9\ud574\uc11c IRQL\uc744 \uc99d\uac00 \uc2dc\ud0ac \n\uc218 \uc788\ub2e4.

\n

KeAcquireInterruptSpinLock<\/h1>\n

The KeAcquireInterruptSpinLock<\/b> routine acquires the spin lock \nassociated with an interrupt object.<\/p>\n

NTKERNELAPI<\/b>
KIRQL<\/b>
  \nKeAcquireInterruptSpinLock (<\/b>
    IN PKINTERRUPT  <\/b>Interrupt<\/a><\/i>
    );<\/b>
<\/p>\n

Comments<\/h4>\n

Drivers use the interrupt spin lock to synchronize access to memory shared \nwith the interrupt's ISR. The driver can release the spin lock by calling KeReleaseInterruptSpinLock<\/b><\/a>.<\/p>\n

Any code that executes while the interrupt spin lock is held does so at IRQL \n= DIRQL for the specified Interrupt<\/i>, so it must execute very quickly. For \nmore information, see Using Critical Sections<\/font><\/u><\/mshelp:link>. <\/p>\n

It is generally faster to use KeSynchronizeExecution<\/b><\/a> to synchronize access than to \nuse KeAcquireInterruptSpinLock<\/b> and KeReleaseInterruptSpinLock<\/b>.<\/p>\n

Callers must be running at IRQL <= DIRQL for \nInterrupt<\/i>.<\/font> (This is the value the driver passed as the \nSynchronizeIrql<\/i> parameter of IoConnectInterrupt<\/b><\/a> when Interrupt<\/i> is \ncreated.)<\/p>\n

Requirements<\/b><\/h4>\n

IRQL: <\/b><=DIRQL (see Comments section)<\/p>\n

Headers: <\/b>Declared in wdm.h<\/i>. Include wdm.h<\/i>, \nntddk.h,<\/i> or ntifs.h<\/i>.<\/p>\n


 IRQL\uc744 \uc99d\uac00 \uc2dc\ud0a4\ub294 \uc774\uc720\uc5d0 \ub300\ud574\uc11c\ub294 \ub2e4\uc74c\uc5d0 \uac19\uc774 \uc54c\uc544\ubcfc \uac83\uc774\ub2e4,

\uadf8\ub9ac\uace0 \uc2a4\ud540 \ub77d\uc744 \uc0ac\uc6a9\ud560 \ub54c\ub294 \ud398\uc774\uc9d5\uc744 \ud558\uba74 \uc548\ub41c\ub2e4<\/font>, \ub514\uc2a4\ud328\uce58 \ub808\ubca8\uc5d0\uc11c \ud398\uc774\uc9d5\uc774 \ub41c\ub2e4\uba74, \uc624\ub958\ub97c \ubc1c\uc0dd

\uc2dc\ud0a4\uac8c \ub41c\ub2e4, \uadf8\ub9ac\uace0 \n\uc2a4\ud540 \ub77d \ucf54\ub4dc \ub0b4\uc5d0\uc11c \ub2e4\ub978 \ud568\uc218 \ud638\ucd9c\uc2dc\uc5d0 \uadf8 \ud53c\ud638\ucd9c \ud568\uc218\ub294 \ud398\uc774\uc9d5\uc744 \ud558\uc9c0 \uc54a\uc544\uc57c\ud55c\ub2e4.

 \uadf8\ub9ac\uace0 \uc2a4\ud540 \ub77d\uc758 \uc2dc\uac04\uc744 \ucd5c\ub300\ud55c \uc904\uc774\ub294 \uac83\uc774 \n\uc88b\ub2e4. 25 micro second\uc815\ub3c4\ub85c MS\uac00 \uad8c\uc7a5<\/font>\ud558\uace0 \uc788\ub2e4.<\/p>\n

 <\/p>\n

\ucd9c\ucc98 : http:\/\/ssmhz.tistory.com<\/a>
\n<\/p>


<\/p>\n","protected":false},"excerpt":{"rendered":"

\uc2a4\ud540 \ub77d\uc740 \ucc38 \uc624\ubb18\ud55c \ubb38\uc81c\uc774\ub2e4. \ud558\uc9c0\ub9cc \uc54c\uace0 \ubcf4\uba74 \uac04\ub2e8\ud55c \ub85c\uc9c1\uc73c\ub85c \ud574\uacb0\ud560 \uc218 \uc788\ub2e4!!  \uc77c\ub2e8 \ub3d9\uae30\ud654 \ubb38\uc81c\uc5d0 \uc9c1\uba74\ud558\uac8c \ub418\uba74, ( \uba40\ud2f0 \ud504\ub85c\uc138\uc11c ) \uc6b0\ub9ac\uac00 \uc775\ud788 \uc54c\uace0 \uc788\ub294 \uc138\ub9c8\ud3ec\uc5b4(Semaphore)\uac19\uc740 \ubc29\ubc95\uc744 \uc0ac\uc6a9\ud574\uc11c \ub77d\ud0b9(Locking)\uc744 \ud574\uc57c\ud55c\ub2e4. \uc774\uac83\uc744 \uc81c\ub300\ub85c \ud574\uc8fc\uc9c0 \uc54a\ub294\ub2e4\uba74 \ub370\ub4dc\ub77d(DeadLock)\uc5d0 \ube60\uc9c0\uac8c\ub41c\ub2e4.  \ub370\ub4dc\ub77d\uc740 \uc6b4\uc601\uccb4\uc81c\ub54c \ub4e4\uc5c8\uc744 \uac83\uc774\ub2e4. \uc5ec\ub7ec \uc2a4\ub808\ub4dc\uac00 \uc784\uacc4\uc601\uc5ed(Critical Section)\uc5d0 \ub4e4\uc5b4\uac00\uae30 \uc704\ud574\uc11c, \uacbd\uc7c1\uc744 \ud560 \uac83\uc774\ub2e4.  \ud558\ub098\uc758 \uc2a4\ub808\ub4dc\uac00 \uc2a4\ud540\ub77d\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\uc744 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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