{"id":4785,"date":"2019-03-20T16:00:18","date_gmt":"2019-03-20T07:00:18","guid":{"rendered":"https:\/\/jennifersoft.com\/ko\/?p=4785"},"modified":"2020-06-17T10:49:02","modified_gmt":"2020-06-17T01:49:02","slug":"2019-03-21","status":"publish","type":"post","link":"https:\/\/jennifersoft.com\/ko\/blog\/tech\/2019-03-21\/","title":{"rendered":"PHP Session Locking: PHP Session \uc7a5\uc560 \uc7ac\ud604 \ubc0f \ud574\uacb0 \ubc29\ubc95"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

\uc774 \uae00\uc740 <\/strong>PHP Session Hang<\/strong><\/a> \uc7a5\uc560\ub97c \uc9c1\uc811 \uc7ac\ud604\ud574 \ubcf4\uace0 \uc65c \uc774\ub7f0 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\ub294\uc9c0, \uc5b4\ub5bb\uac8c \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud560 \uc218 \uc788\ub294\uc9c0 \uc124\uba85\ud569\ub2c8\ub2e4. \uae00 \ud558\ub2e8\uc758 \uacb0\ub860\ub9cc \uc77d\uc73c\uc154\ub3c4 \ucda9\ubd84\ud569\ub2c8\ub2e4. \uc774\uc81c \uc7a5\uc560\ub97c \uc7ac\ud604\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. <\/strong><\/p>\n\n\n\n

Session\uc744 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uc558\uc744 \ub54c<\/h3>\n\n\n\n

\ub2e4\uc74c PHP \uc2a4\ud06c\ub9bd\ud2b8\ub97c \uc791\uc131\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n

<?php\n    function useful_function() {\n        sleep(1);\n    }\n    useful_function();\n?><\/pre>\n\n\n\n
ab \uba85\ub839\uc744 \uc774\uc6a9\ud574 first.php\ub85c \ub3d9\uc2dc\uc5d0<\/strong> 10\uac1c \uc694\uccad\uc744 \uc11c\ubc84\uc5d0 \ubcf4\ub0c5\ub2c8\ub2e4.<\/p>\n\n\n\n
ab -c 10 -n 10 http:\/\/localhost:8999\/first.php<\/pre>\n\n\n\n
\uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
...\nConcurrency Level:      10\nTime taken for tests:   1.003 seconds\nComplete requests:      10\n...\n<\/pre>\n\n\n\n
1\ucd08\uac00 \uac78\ub9ac\ub294 \uc694\uccad\uc744 \ub3d9\uc2dc\uc5d0<\/strong> 10\uac1c \uc218\ud589\ud588\uc73c\ub2c8, \uc704 ab \uba85\ub839\uc5b4\uc758 \uc218\ud589 \uc2dc\uac04\uc740 \ub2f9\uc5f0\ud788 1\ucd08\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
PHP Session\uc744 \uc0ac\uc6a9\ud588\uc744\ub54c<\/h3>\n\n\n\n
\uc774\uc81c Session\uc744 \uc0ac\uc6a9\ud574 \uc694\uccad\uc790\uc758 \ud398\uc774\uc9c0 \ubc29\ubb38 \ud69f\uc218\ub97c \ubcf4\uc5ec\uc8fc\ub294 \uae30\ub2a5\uc744 \ucd94\uac00\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
<?php \/\/session_test1.php\n    function useful_function(){\n        sleep(1);\n    }\n    session_start();\n    if(isset($_SESSION['visit_count'])===FALSE){\n        $_SESSION['visit_count'] = 1;\n    }\n    else{\n        $_SESSION['visit_count'] += 1;\n    }\n    $visit_count = 'visit_count = '.$_SESSION['visit_count'];\n    echo $visit_count;\n    aries_add_message_profile($visit_count); \/\/add 'visit_count' to jennifer profiles\n    useful_function();\n?><\/pre>\n\n\n\n
curl \ud638\ucd9c\uc744 \ud1b5\ud574 \ub2e8\uc77c \uc694\uccad\uc758 \uacb0\uacfc\ub97c \ud655\uc778\ud588\uc744\ub54c \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
curl -v http:\/\/localhost:8999\/session_test1.php\n*   Trying 127.0.0.1...\n...\n< HTTP\/1.1 200 OK\n< Date: Wed, 05 Dec 2018 05:34:53 GMT\n< Server: Apache\/2.2.22 (Ubuntu)\n< Set-Cookie: PHPSESSID=lmrfduhgfm6oik62fi2c9q4ek7; expires=Wed, 05-Dec-2018 13:34:53 GMT; path=\/\n< Expires: Thu, 19 Nov 1981 08:52:00 GMT\n...\nvisit_count = 1%  <\/pre>\n\n\n\n
\uc751\ub2f5\uc73c\ub85c visit_count=1\uc774 \uc8fc\uc5b4\uc84c\uc2b5\ub2c8\ub2e4. HTTP \uc751\ub2f5 \ucfe0\ud0a4\uc5d0  PHPSESSID=lmrfduhgfm6oik62fi2c9q4ek7\uc774 \ucd94\uac00\ub41c \uac83\uc73c\ub85c \ubcf4\uc544 PHP \uae30\ubcf8 Session \ud578\ub4e4\ub7ec\ub294 Cookie\ub97c \uc0ac\uc6a9\ud558\uba70, PHPSESSID \ucfe0\ud0a4 \uac12\uc774 Session \uc2dd\ubcc4\uc790\ub85c \uc0ac\uc6a9\ub428\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ub2e4\uc2dc \ud55c\ubc88 curl\uc744 \uc694\uccad\uc744 \ubcf4\ub0b4\ub418, Cookie\uc5d0 PHPSESSID\ub97c \ub123\uc5b4 \ubcf4\ub0b4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
curl --cookie \"PHPSESSID=lmrfduhgfm6oik62fi2c9q4ek7\" http:\/\/localhost:8999\/session_test1.php\n...\nvisit_count = 2%  <\/pre>\n\n\n\n
\uc751\ub2f5\uc73c\ub85c visit_count=2 \ub97c \uc5bb\uc5c8\uc2b5\ub2c8\ub2e4. \uc0c8\ub85c \ub9cc\ub4e0 \uae30\ub2a5\uc740 \uc798 \ub3d9\uc791\ud558\uace0 \uc788\ub124\uc694. \uc774\uc81c \uc6f9 \uc11c\ubc84\uc5d0 \uc5b4\ub5a4 \uc77c\uc774 \ubc8c\uc5b4\uc84c\ub294\uc9c0 \ud655\uc778\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. ls \/tmp \ub97c \uc2e4\ud589\ud574\ubcf4\uba74 lmrfduhgfm6oik62fi2c9q4ek7 \ud30c\uc77c\uc774 \uc874\uc7ac\ud568\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \ud574\ub2f9 \ud30c\uc77c\uc758 \ub0b4\uc6a9\uc740 \ub2e4\uc74c\uacfc \uac19\uc740\ub370, \uc774\uac83\uc73c\ub85c \uc138\uc158\uc774 \uc5b4\ub5bb\uac8c \uc800\uc7a5\ub418\ub294\uc9c0 \ud655\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
visit_count|i:2;<\/pre>\n\n\n\n
PHP \uc138\uc158 \uc7a5\uc560 \uc7ac\ud604 Case 1<\/h3>\n\n\n\n
Cookie\ub85c PHPSESSID\ub97c \uc9c0\uc815\ud574 \ub3d9\uc2dc\uc5d0<\/strong> 10\uac1c \uc694\uccad\uc744 \ubcf4\ub0c5\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \uc5b4\ub5a4 \uc77c\uc774 \ubc8c\uc5b4\uc9c0\ub294\uc9c0 \ud655\uc778\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
ab -c 10 -n 10 -C PHPSESSID=lmrfduhgfm6oik62fi2c9q4ek7 http:\/\/localhost:8999\/session_test1.php\n...\nConcurrency Level:      10\nTime taken for tests:   10.006 seconds\nComplete requests:      10\n...<\/pre>\n\n\n\n
Session\uae30\ub2a5\uc744 \ub123\uc9c0 \uc54a\uc558\uc744\ub54c ab \uba85\ub839\uc758 \uc218\ud589 \uc2dc\uac04\uc740 1\ucd08\uc600\uc2b5\ub2c8\ub2e4. \uac19\uc740 Session ID\ub85c \ub3d9\uc2dc\uc5d0 10\uac1c\uc758 \uc694\uccad\uc744 \ubcf4\ub0b4\ub2c8 10\ucd08\uac00 \uac78\ub838\uc2b5\ub2c8\ub2e4. \uc774\ub54c JENNIFER X-View\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\uc704 \uadf8\ub9bc\uc5d0\uc11c X \ucd95\uc740 \uc694\uccad \uc2dc\uac04(Request Time)\uc774\uba70, Y\ucd95\uc740 \ucc98\ub9ac \uc2dc\uac04(Elapsed Time)\uc785\ub2c8\ub2e4. 10\uac1c \uc694\uccad\uc740 \ubaa8\ub450 \ub3d9\uc77c\ud55c \uc2dc\uac04\uc5d0 \ub4e4\uc5b4\uc654\uc73c\ub098 \ucc98\ub9ac\ub41c \uc2dc\uac04\uc740 \uac01\uac01 \ub2e4\ub974\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\ud2b8\ub79c\uc7ad\uc158\uc758 \uc0c1\uc138 \ub0b4\uc6a9\uc744 \ubcf4\uba74 \uc2dc\uc791\uc2dc\uac04\uc740 \ubaa8\ub450 16:12:52 090 \uc73c\ub85c \ucc28\uc774\uac00 \uc5c6\uc73c\ub098 \uc751\ub2f5\uc2dc\uac04\uc740 1\ucd08, 2\ucd08, 3\ucd08, 4\ucd08, \u2026 10\ucd08 \uc785\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ub9c8\uc9c0\ub9c9\uc73c\ub85c \ucc98\ub9ac\ub41c \uc694\uccad\uc758 session_start \ud568\uc218\uc758 \uc218\ud589 \uc2dc\uac04\uc774 9\ucd08\uac00 \uac78\ub838\ub124\uc694. \uc704 \ud604\uc0c1\uc774 \uad00\ucc30\ub418\ub294 \uae4c\ub2ed\uc740 File session handler\uac00 Race Condition\uc744 \ud53c\ud558\uae30 \uc704\ud574 Session \ud30c\uc77c\uc744 \uc7a0\uadf8\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4. (\ub9c1\ud06c<\/a>) \uc774\ub294 \uc2e4\uc2dc\uac04 \ucf5c\uc2a4\ud0dd\uc744 \ud655\uc778\ud574 \ubcf4\uba74 \ud655\uc2e4\ud788 \ub4dc\ub7ec\ub0a9\ub2c8\ub2e4. (\ud604\uc7ac \uc2e4\ud589\uc911\uc778 \ud568\uc218\uac00 Lock\uc744 \uc5bb\uae30 \uc704\ud574 \uc0ac\uc6a9\ub418\ub294 flock<\/a> \uc784\uc5d0 \uc8fc\ubaa9\ud574 \uc8fc\uc138\uc694)<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\uc0ac\uc6a9\uc790\uac00 \ub3d9\uc2dc\uc5d0 \uc694\uccad\uc744 \ubcf4\ub0b4\uc9c0\n\uc54a\uc73c\ub2c8, \uc774\ub7f0 \uc77c\uc740 \ubc8c\uc5b4\uc9c0\uc9c0 \uc54a\ub294\ub2e4\uad6c\uc694? \uadf8\ub807\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \uc774\ub7f0 \uc2dc\ub098\ub9ac\uc624\ub97c \uc0c1\uc0c1\ud574 \ubd05\ub2c8\ub2e4. \ub85c\uadf8\uc778\ud55c \uc0ac\uc6a9\uc790\uac00 \ube0c\ub77c\uc6b0\uc800\ub85c \uc694\uccad\uc744\n\ubcf4\ub0c8\uc2b5\ub2c8\ub2e4. \uadf8\ub7f0\ub370 \ud574\ub2f9 \uc0ac\uc774\ud2b8\uc758 \uc751\ub2f5\uc774 \ub290\ub824 \uc0ac\uc6a9\uc790\uac00 F5\ub97c\n\ub20c\ub7ec \uc7ac \uc694\uccad\uc744 \ubcf4\ub0c5\ub2c8\ub2e4. \uadf8\ub798\ub3c4 \uc751\ub2f5\uc774 \uc624\uc9c0 \uc54a\uc544 \uacc4\uc18d F5\ub97c\n\ubc18\ubcf5\ud574 \ub204\ub985\ub2c8\ub2e4. \uadf8 \uacb0\uacfc \uc0ac\uc6a9\uc790\uac00 \uc7ac \uc694\uccad \ubcf4\ub0b8 \uc218 \ub9cc\ud07c \uc544\ud30c\uce58 \ud504\ub85c\uc138\uc2a4\uac00 \uc0dd\uc131\ub418\uba70(\uc544\ud30c\uce58 Prefork \ubaa8\ub4dc\uc758 \uacbd\uc6b0)\n\uc774\ub294 \uc790\uc6d0 \uace0\uac08\ub85c \uc774\uc5b4\uc9c8 \uc218 \uc788\uc2b5\ub2c8\ub2e4. (100\ubc88 \uc7ac\uc694\uccad \ud588\ub2e4\uace0 \uc0c1\uc0c1\ud574\ubcf4\uc138\uc694)<\/p>\n\n\n\n
 PHP \uc138\uc158 \uc7a5\uc560 \uc7ac\ud604 Case 2<\/h3>\n\n\n\n
\ubb38\uc81c\ub97c \uc880 \ub354 \uc2ec\uac01\ud558\uac8c \ub9cc\ub4e4\uc5b4 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4. useful_function\uc5d0 \uae30\ub2a5\uc744 \ucd94\uac00\ud558\ub418, \uadf8 \uae30\ub2a5\uc744 \uc704\ud574 db connection\uc774 \ud544\uc694\ud558\ub2e4\uace0 \uac00\uc815\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
<?php \/\/session_test2.php\n    function useful_function($db){\n        sleep(1);\n    }\n    $db = mysql_connect('...');\n    session_start();\n    if(isset($_SESSION['visit_count'])===FALSE){\n        $_SESSION['visit_count'] = 1;\n    }\n    else{\n        $_SESSION['visit_count'] += 1;\n    }\n    $visit_count = 'visit_count = '.$_SESSION['visit_count'];\n    echo $visit_count;\n    aries_add_message_profile($visit_count); \n    useful_function($db);\n?><\/pre>\n\n\n\n
\"\"<\/figure>\n\n\n\n
session_start() \uc804\uc5d0 mysql_connect\ub97c \ud638\ucd9c\ud588\uc2b5\ub2c8\ub2e4. \uc774 \uacbd\uc6b0 \ud55c Session\uc758 \uc694\uccad\uc774 \ub3d9\uc2dc\uc5d0 N\ubc88 \ud638\ucd9c\ub418\uba74 DB Connection \uc218 \ub610\ud55c N\uac1c \ub9cc\ud07c \uc99d\uac00 \ud569\ub2c8\ub2e4. \uc774\ub97c \ud53c\ud558\uae30 \uc704\ud574\uc120 session_start \uc804\uc5d0 \uc790\uc6d0\uc744 \ud68d\ub4dd\ud558\uc9c0\n\uc54a\uc544\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
DB \uc790\uc6d0\uc744 session_start() \ud638\ucd9c \ud6c4 \uc5bb\uac8c \ucf54\ub4dc\ub97c \uc218\uc815 \ud588\uc744\ub54c Active DB Connection \ucc28\ud2b8\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4. DB \ucee4\ub125\uc158 \uc218\uac00 1\ub85c \uc720\uc9c0\ub428\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
session_write_close\ub97c \uc774\uc6a9\ud55c \ubb38\uc81c \ud574\uacb0<\/h3>\n\n\n\n
PHP.net\uc740 \uc704 \uc0ac\ud56d\uc5d0 \ub300\ud574 \uacbd\uace0<\/a> \ud558\uace0 \uc788\uace0 \uc774\uc5d0 \ub300\ud55c \ud574\uacb0 \ubc29\ubc95\ub3c4\n\uc81c\uc548\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
  1. read_and_close<\/a> \uc635\uc158\uacfc \ud568\uaed8\n     session_start \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\ub77c. (PHP 7.0 \uc774\uc0c1\ub9cc \uc774 \uc635\uc158\uc744 \uc0ac\uc6a9\ud560\n     \uc218 \uc788\uc2b5\ub2c8\ub2e4.)<\/li>
  2. \uc138\uc158 \ub370\uc774\ud130\ub97c \uc218\uc815\ud55c \ud6c4 \uac00\ub2a5\ud55c \ube68\ub9ac session_commit<\/a> \ub610\ub294 session_write_close<\/a>\ub97c \uc0ac\uc6a9\ud574\n     session lock\uc744 \ud574\uc81c\ud574\ub77c.<\/li><\/ol>\n\n\n\n
    \uc5ec\uae30\uc11c\ub294 2\ubc88 \ubc29\ubc95\uc744 \ud0dd\ud574 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
    <?php\n    function useful_function($db){\n        sleep(1);\n    }\n    session_start();\n    if(isset($_SESSION['visit_count'])===FALSE){\n        $_SESSION['visit_count'] = 1;\n    }\n    else{\n        $_SESSION['visit_count'] += 1;\n    }\n    session_write_close(); \/\/release session lock\n    $visit_count = 'visit_count = '.$_SESSION['visit_count'];\n    echo $visit_count;\n    $db=mysql_connect('...'); \n    aries_add_message_profile($visit_count); \n    \n    \/\/Change _SESSION['visit_count']\n    $_SESSION['visit_count'] = 'write data after session_write_close()'; \n    aries_add_message_profile($_SESSION['visit_count']); \n    useful_function($db);\n?><\/pre>\n\n\n\n
    \uc774\ub807\uac8c \ud504\ub85c\uadf8\ub7a8\uc744 \uc218\uc815\ud55c \ud6c4 \ub3d9\uc2dc\uc5d0 10\uac1c \uc694\uccad\uc744 \ubcf4\ub0b4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
    ab -c 10 -n 10 -C PHPSESSID=lmrfduhgfm6oik62fi2c9q4ek7 http:\/\/localhost:8999\/session_test3.php\n...\nConcurrency Level:      10\nTime taken for tests:   1.007 seconds\n...<\/pre>\n\n\n\n
    \ubb38\uc81c\uac00 \ud574\uacb0\ub418\uc5c8\ub124\uc694. \ub3d9\uc2dc\uc5d0 \ubaa8\ub4e0 \uc694\uccad\uc774 \ucc98\ub9ac\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \ub2e8, \uc8fc\uc758\uc810\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc704 \ucf54\ub4dc\ub294 session_write_close() \ud638\ucd9c \uc774\ud6c4 $_SESSION[\u2018visit_count\u2019]\ub97c \uc218\uc815\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc5b4\ub5bb\uac8c \ub3d9\uc791\ud560\uae4c\uc694? Jennifer \ud504\ub85c\ud30c\uc77c\uc744 \ud655\uc778\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
     $_SESSION[\u2018visit_count\u2019] \uac12\uc774 ‘write data after session_write_close()’\ub85c \uc218\uc815\ub41c\uac83\uc744 \ud655\uc778\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\uc81c \/tmp \uc5d0 \uc800\uc7a5\ub41c sess\ud30c\uc77c\uc758 \ub0b4\uc6a9\uc744 \ud655\uc778\ud574\ubd05\uc2dc\ub2e4. <\/p>\n\n\n\n
    cat \/tmp\/sess_lmrfduhgfm6oik62fi2c9q4ek7 \nvisit_count|i:40;<\/pre>\n\n\n\n
    visit_count \uac12\uc774 \u2018write data after\nsession_write_close()\u2018\uac00 \uc544\ub2c8\ub77c 40\uc778 \uac83\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\uac83\uc73c\ub85c session_write_close() \ud638\ucd9c\n\uc774\ud6c4 \uc218\uc815\ub41c $_SESSION \ubcc0\uc218 \uac12\uc740 \uc694\uccad\uc774 \ucc98\ub9ac\ub418\ub294 \ub3d9\uc548 \uc720\ud6a8\ud558\ub098, Session \ub370\uc774\ud130\uc5d0 \uae30\ub85d\ub418\uc9c0 \uc54a\ub294 \ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\uac83\uc774 session_write_close \ud574\ubc95\uc758 \ub2e8\uc810\uc785\ub2c8\ub2e4. \ub9cc\uc57d session\uc744 \uc218\uc815\ud558\uace0 \uc0ac\uc6a9\ud558\ub294 \ucf54\ub4dc\uac00 \uc5ec\ub7ec \uacf3\uc5d0 \ud769\uc5b4\uc838 \uc788\ub2e4\uba74 \uc774 \ubc29\ubc95\uc744 \uc801\uc6a9\ud558\uae30 \uae4c\ub2e4\ub85c\uc6b0\uba70, \uc2e4\uc218\ud588\uc744 \uacbd\uc6b0 \uc0ac\uc6a9\uc790\uac00 \ubcf4\ub294 \uac12\uacfc \uc2e4\uc81c Session\uc5d0 \uc800\uc7a5\ub41c \uac12\uc774\n\ub2e4\ub97c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
    Redis Session\nHandler\ub97c \uc0ac\uc6a9\ud574 \ubb38\uc81c \ud574\uacb0<\/h3>\n\n\n\n
    \uc774\ubc88\uc5d0\ub294 Session\uc744 \uc7a0\uadf8\uc9c0 \uc54a\ub294 Redis \uc138\uc158 \ud578\ub4e4\ub7ec\ub97c \uc0ac\uc6a9\ud574 \ubb38\uc81c\ub97c \ud574\uacb0\ud574\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.(option\uc73c\ub85c Lock\uc744 \uc0ac\uc6a9\ud558\uac8c \ud560 \uc218\ub3c4 \uc788\uc2b5\ub2c8\ub2e4.) \uc704\uc5d0 \uc815\uc758\ud55c session_test2.php(session_write_close\ub97c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 \uc2a4\ud06c\ub9bd\ud2b8)\ub97c \ub3d9\uc2dc\uc5d0 10\ubc88 \ud638\ucd9c\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
    ab -c 10 -n 10 -C PHPSESSID=lmrfduhgfm6oik62fi2c9q4ek7 http:\/\/localhost:8999\/session_test2.php\n...\nConcurrency Level:      10\nTime taken for tests:   1.006 seconds<\/pre>\n\n\n\n
    Lock\uc73c\ub85c \uc778\ud55c \ubb38\uc81c\ub294 \uc0ac\ub77c\uc84c\uc2b5\ub2c8\ub2e4. \ubaa8\ub4e0 \uc694\uccad\uc774 \ub3d9\uc2dc\uc5d0 \ucc98\ub9ac\ub418\uc5c8\ub124\uc694. Session Data\ub3c4 \ud655\uc778\ud574 \ubd05\ub2c8\ub2e4.<\/p>\n\n\n\n
    # redis-cli\n127.0.0.1:6379> KEYS *\n1) \"PHPREDIS_SESSION:lmrfduhgfm6oik62fi2c9q4ek7\"\n127.0.0.1:6379> GET \"PHPREDIS_SESSION:lmrfduhgfm6oik62fi2c9q4ek7\"\n\"visit_count|i:6;\"\n127.0.0.1:6379> v<\/pre>\n\n\n\n
    Session \ub370\uc774\ud130\uac00 \uc800\uc7a5\ub418\uc5b4 \uc788\uc74c\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uadf8\ub7f0\ub370 visit_count\uac00\n10\uc774 \uc544\ub2c8\ub77c 6\uc73c\ub85c \uae30\ub85d \ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. Lock\uc744\n\uc0ac\uc6a9\ud558\uc9c0 \uc54a\uc558\uae30\uc5d0 \ub3d9\uc2dc\uc131 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud55c \uac83\uc785\ub2c8\ub2e4. \uc774\uac83\uc774 Lock\uc744\n\uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 Session Handler\uc758 \ub2e8\uc810\uc785\ub2c8\ub2e4. Redis\nSession Handler\ub97c Lock \uc5c6\uc774 \uc0ac\uc6a9\ud558\uae30\ub85c \ud588\ub2e4\uba74 \uc774\ub97c \uc54c\uace0 \uc788\uc5b4\uc57c \ud558\uba70 Session\uc5d0 \uc800\uc7a5\ub41c \uac12\uc774 \ubb34\uacb0(Integrity)\ud560 \uac83\uc774\ub780 \uae30\ub300\ub97c\n\ud558\uc9c0 \uc54a\uc544\uc57c \ud569\ub2c8\ub2e4. \uadf8\ub9ac\uace0 \ubb34\uacb0\uc131\uc744 \uc694\uad6c\ud558\ub294 \ub370\uc774\ud130\ub97c Session\uc5d0\n\uc800\uc7a5\ud558\uc9c0 \uc54a\uc544\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
    Framework, Library\uc758 \ub2e8\uc21c\ud55c \uc0ac\uc6a9\uc740 \ud574\uacb0\ucc45\uc774 \ub420 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/h3>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    \uc704\ub294 CodeIgniter\uc5d0\uc11c session \ud578\ub4e4\ub7ec\ub85c database\ub97c \uc9c0\uc815\ud588\uc744\ub54c \ud655\uc778 \uac00\ub2a5\ud55c \ud504\ub85c\ud30c\uc77c \uc785\ub2c8\ub2e4. session_handler\ub85c database\ub97c \uc0ac\uc6a9\ud558\uac8c \ud588\uc2b5\ub2c8\ub2e4. \ub530\ub77c\uc11c session_start \ud568\uc218 \uc804\uc5d0 DB_CONNECTION\uc774 \ud638\ucd9c \ub418\uc5b4\uc57c\ub9cc \ud569\ub2c8\ub2e4. SQL Query\ub97c \ud655\uc778\ud574\ubcf4\ub2c8 Lock\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\uc73c\uba70 session_start() \uba54\uc18c\ub4dc \ud638\ucd9c\uc774 2\ucd08 \uc774\uc0c1 \uac78\ub9b0 \uac83\uc73c\ub85c \ubcf4\uc544 Lock\uc73c\ub85c \uc778\ud55c \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\uace0 \uc788\uc74c\uc744 \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc704\ub97c \uc7ac\ud604\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ud55c CodeIgniter Controller \ucf54\ub4dc\ub294 \uc544\ub798\uc640 \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
    <?php\nclass Welcome extends CI_Controller {\n\tfunction __construct(){\n\t\tparent::__construct();\n\t\t$this->load->library('session');\n\t}\n\tpublic function index()\n\t{\n\t\tsleep(1);\n\t\t$this->load->view('welcome_message');\n\t}\n}<\/pre>\n\n\n\n
    \uc774 \ub2e8\uc21c\ud55c \ucf54\ub4dc\uc5d0 session_start \uc640 session_write_close\uac00 \uac10\ucdb0\uc838 \uc788\ub2e4\ub294 \uc0ac\uc2e4\uc774 \ub180\ub78d\uc2b5\ub2c8\ub2e4.\n\ud639\uc2dc CodeIgniter Session\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\ub2e4\uba74 CodeIgniter\/A note about concurrency<\/a> \ub2e8\ub77d\uc744 \uc77d\uc5b4\ubcf4\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4. \uc800 \ub2e8\ub77d\uc740 \ud574\ub2f9 \ubb38\uc11c\uc758 \ub2e4\ub978 \ub2e8\ub77d\uacfc\ub294 \ub2ec\ub9ac \ub2e4\uc18c \uaca9\uc815\uc801\uc778 \ubb38\uccb4\ub85c \uc4f0\uc5ec \uc788\uc2b5\ub2c8\ub2e4. CodeIgniter\uac00 Session Lock\uc73c\ub85c \ub9ce\uc740 \uace0\uc2ec(\ub610\ub294 \uace0\uc0dd)\uc744 \ud588\ub2e4\uace0 \ucd94\uce21\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. (CodeIgniter 3.0 Session Library\ub294 \uc644\uc804\ud788 \uc7ac \uc791\uc131\ub418\uc5c8\ub2e4\uace0 \ud558\ub124\uc694) \uadf8 \uace0\uc2ec \ub05d\uc5d0 CodeIgniter\ub294 \ub2e4\uc74c \ubb38\uc7a5\uc744 \ub0b4\ub193\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n\n\n
    Locking is not the issue, it is a solution. Your issue is that you still have the session open, while you\u2019ve already processed it and therefore no longer need it. So, what you need is to close the session for the current request after you no longer need it.<\/p> 
    CodeIgniter – A note about concurrency \ub2e8\ub77d\uc5d0\uc11c \ubc1c\ucdcc\ufeff<\/em><\/strong> <\/cite><\/blockquote>\n\n\n\n

    \uc704\uc5d0 \uc778\uc6a9\ud55c \ub0b4\uc6a9\uc774 CodeIgniter\uac00 Session Lock\uc744 \ubc14\ub77c\ubcf4\ub294 \uad00\uc810\uc785\ub2c8\ub2e4. \uc774\uc640 \ub2ec\ub9ac Laravel\uc758\nSession\uae30\ub2a5\uc740 session_start\ud568\uc218\ub97c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uc73c\uba70 Session Lock\ub3c4 \ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub2e4\ub9cc \uc774\ub85c \uc778\ud574 \ub3d9\uc2dc\uc131 \ubb38\uc81c\uac00\n\ubc1c\uc0dd\ud569\ub2c8\ub2e4. \uc774     \uc774\uc288<\/a>\ub97c \uc0b4\ud3b4 \ubcf4\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n\n\n\n
    Fraemework, \ub610\ub294 Library\uc758 Session \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\ub2e4\uba74 Session Lock \uc5ec\ubd80\uc5d0\n\ub300\ud574 \uc54c\uc544\uc57c \ud569\ub2c8\ub2e4. Lock\uc744 \ud55c\ub2e4\uba74 Session\uc744 \uc218\uc815\ud55c\n\ud6c4 \uac00\ub2a5\ud55c \ube68\ub9ac Lock\uc744 \ud574\uc81c\ud574\uc57c \ud569\ub2c8\ub2e4. Session Lock\uc744\n\uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 Framework\ub77c\uba74 \ub3d9\uc2dc\uc131 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc74c\uc744 \uc54c\uace0 \uc788\uc5b4\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
    \uacb0\ub860<\/h3>\n\n\n\n
    \uc9c0\uae08\uae4c\uc9c0 Session Lock\uc73c\ub85c \uc778\ud55c \uc7a5\uc560\ub97c \uc7ac\ud604\ud574\ubcf4\uace0 \ud574\uacb0\ud574\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc774 \uacfc\uc815\uc744 \ud1b5\ud574 \ub2e4\uc74c \uad8c\uace0 \uc0ac\ud56d\uc744 \ub3c4\ucd9c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/strong><\/p>\n\n\n\n
    • \uc0ac\uc6a9\ud558\uace0 \uc788\ub294 Session Handler\uc758 Lock \uc815\ucc45\uc774 \ubb34\uc5c7\uc778\uc9c0 \uc54c\uc544\uc57c \ud55c\ub2e4.
      • PHP \uae30\ubcf8 Session Handler\ub294 file\uc774\uba70, Session Data\ub97c Lock\ud55c\ub2e4.<\/li>
      • Redis Session Handler\ub294 Lock\uc744\n      \ud558\uc9c0 \uc54a\ub294\ub2e4. \uc635\uc158\uc744 \ud1b5\ud574 Lock \uc815\ucc45\uc744 \ubcc0\uacbd\ud560\n      \uc218 \uc788\ub2e4.<\/li>
      • Memcached Session Handler\ub294 Lock\uc744\n      \ud55c\ub2e4. \uc635\uc158\uc744 \ud1b5\ud574 Lock \uc815\ucc45\uc744 \ubcc0\uacbd\ud560 \uc218\n      \uc788\ub2e4.<\/li><\/ul><\/li>
      • Session Handler\uac00 Lock\uc744 \uc0ac\uc6a9\ud558\uace0 \uc788\ub2e4\uba74 Session\uc744 \uc218\uc815\ud55c \ud6c4 \ubc18\ub4dc\uc2dc session_write_close\ub85c Lock\uc744 \ud574\uc81c\ud574 \uc8fc\uc5b4\uc57c \ud55c\ub2e4.<\/li>
      • Session Handler\uac00 Lock\uc744 \ud558\uace0 \uc788\uc9c0 \uc54a\ub2e4\uba74 \ub3d9\uc2dc\uc131 \ubb38\uc81c\uac00\n     \ubc1c\uc0dd\ud560 \uc218 \uc788\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc54c\uc544\uc57c \ud558\uba70, \ubb34\uacb0\uc131\uc744 \uc694\uad6c\ud558\ub294 \ub370\uc774\ud130\ub97c Session\uc5d0 \uc800\uc7a5\ud558\uc9c0 \ub9d0\uc544\uc57c \ud55c\ub2e4.<\/li><\/ul>\n\n\n\n
        \ub9c8\uc9c0\ub9c9\uc5d0 \uc0b4\ud3b4\ubd24\ub4ef\uc774 \uc704 \uad8c\uace0\ub294 Library, Framework\uc5d0 \uc788\ub294 Session\uae30\ub2a5\uc744 \uc0ac\uc6a9\ud560 \ub54c\ub3c4 \uc801\uc6a9\ub418\uc5b4\uc57c \ud569\ub2c8\ub2e4. \uc5ec\ub7ec\ubd84\uc774 \uc0ac\uc6a9\ud558\ub294 Library\uc758 Session\uc740 \uc5b4\ub5bb\uac8c \uad6c\ud604\ub418\uc5b4 \uc788\ub098\uc694? Lock\uc744 \uc0ac\uc6a9\ud558\ub098\uc694? \ub3d9\uc2dc\uc131 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\uc9c0\ub294 \uc54a\ub098\uc694?<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"\uc774 \uae00\uc740 PHP Session Hang \uc7a5\uc560\ub97c \uc9c1\uc811 \uc7ac\ud604\ud574 \ubcf4\uace0 \uc65c \uc774\ub7f0 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud558\ub294\uc9c0, \uc5b4\ub5bb\uac8c \uc774 \ubb38\uc81c\ub97c \ud574\uacb0\ud560 \uc218 \uc788\ub294\uc9c0 \uc124\uba85\ud569\ub2c8\ub2e4. \uae00 \ud558\ub2e8\uc758…","protected":false},"author":15,"featured_media":5436,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[204],"tags":[175,130,176],"class_list":["post-4785","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","tag-php-blocking","tag-php","tag-session-lock"],"acf":[],"_links":{"self":[{"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/posts\/4785","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/comments?post=4785"}],"version-history":[{"count":25,"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/posts\/4785\/revisions"}],"predecessor-version":[{"id":5447,"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/posts\/4785\/revisions\/5447"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/media\/5436"}],"wp:attachment":[{"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/media?parent=4785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/categories?post=4785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jennifersoft.com\/ko\/wp-json\/wp\/v2\/tags?post=4785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}