Commit d4303ecfda4c98bdfab375fb0921eb617bee4774
1 parent
56056fae
locking mechanismen hinuzgefuegt...so gut wies eben geht
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6 changed files
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111 additions
and
148 deletions
| @@ -17,3 +17,4 @@ | @@ -17,3 +17,4 @@ | ||
| 17 | http://www.php-faq.de/search.php?q=Locking&l=20 | 17 | http://www.php-faq.de/search.php?q=Locking&l=20 |
| 18 | web developer | 18 | web developer |
| 19 | http://de.wikipedia.org/wiki/Semaphor_%28Informatik%29 -djikstra PV- | 19 | http://de.wikipedia.org/wiki/Semaphor_%28Informatik%29 -djikstra PV- |
| 20 | + http://www.kreissl.info/diggs/bs_04.php |
| 1 | <?php | 1 | <?php |
| 2 | 2 | ||
| 3 | -// $english = mysql_escape_string($_REQUEST['translate']); | ||
| 4 | -// Der Service ist zur Zeit leider deaktiviert.... | ||
| 5 | -// $trans = new SoapClient( | ||
| 6 | -// "http://www.xmethods.net/sd/2001/BabelFishService.wsdl"); | ||
| 7 | - | ||
| 8 | -/* | ||
| 9 | - try | ||
| 10 | - { | ||
| 11 | - $german = $trans->BabelFish("en_de",$english); | ||
| 12 | - $french = $trans->BabelFish("en_fr",$english); | ||
| 13 | - } | ||
| 14 | - catch(SoapFault $e) | ||
| 15 | - { | ||
| 16 | - $english = "not found"; | ||
| 17 | - $german = "not found"; | ||
| 18 | - $french = "not found"; | ||
| 19 | - } | ||
| 20 | -*/ | ||
| 21 | - class dummy | 3 | +class dummy |
| 4 | +{ | ||
| 5 | + // nur public member werden via json verschickt. | ||
| 6 | + public $german; | ||
| 7 | + public $english; | ||
| 8 | + public $french; | ||
| 9 | + | ||
| 10 | + function __construct ($english, $german, $french) | ||
| 22 | { | 11 | { |
| 23 | - // nur public member werden via json verschickt. | ||
| 24 | - public $german; | ||
| 25 | - public $english; | ||
| 26 | - public $french; | ||
| 27 | - | ||
| 28 | - function __construct ($english, $german, $french) | ||
| 29 | - { | ||
| 30 | - $this->german = $german; | ||
| 31 | - $this->english = $english; | ||
| 32 | - $this->french["val1"] = $french; | ||
| 33 | - $this->french["val2"] = "jokus"; | ||
| 34 | - } | ||
| 35 | - } | ||
| 36 | - | ||
| 37 | - $encoding = FALSE; | ||
| 38 | - if (isset ($_SERVER['HTTP_ACCEPT_ENCODING']) && | ||
| 39 | - strpos ($_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip') !== FALSE) | ||
| 40 | - $encoding = "x-gzip"; | ||
| 41 | - if (isset ($_SERVER['HTTP_ACCEPT_ENCODING']) && | ||
| 42 | - strpos ($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE) | ||
| 43 | - $encoding = "gzip"; | ||
| 44 | - | ||
| 45 | - header ('Content-type: text/plain'); | ||
| 46 | - | ||
| 47 | - $result = FALSE; | ||
| 48 | - if ($encoding !== FALSE) | ||
| 49 | - $result = gzcompress (json_encode (new dummy ( | ||
| 50 | - 'doing gzip', 'gezipedte Daten', 'la zippo'))); | ||
| 51 | - | ||
| 52 | - if ($result !== FALSE) | ||
| 53 | - { | ||
| 54 | - header ('Content-Encoding: ' . $encoding); | ||
| 55 | - | ||
| 56 | - print ("\x1f\x8b\x08\x00\x00\x00\x00\x00"); | ||
| 57 | - print ($result); | ||
| 58 | - } | ||
| 59 | - else | ||
| 60 | - { | ||
| 61 | - $result = json_encode (new dummy ( | ||
| 62 | - 'doing no gzip', 'nicht gezipedte Daten', 'no la zippo')); | ||
| 63 | - | ||
| 64 | - print ($result); | 12 | + $this->german = $german; |
| 13 | + $this->english = $english; | ||
| 14 | + $this->french["val1"] = $french; | ||
| 15 | + $this->french["val2"] = "jokus"; | ||
| 65 | } | 16 | } |
| 17 | +} | ||
| 18 | + | ||
| 19 | +$encoding = FALSE; | ||
| 20 | +if (isset ($_SERVER['HTTP_ACCEPT_ENCODING']) && | ||
| 21 | + strpos ($_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip') !== FALSE) | ||
| 22 | +$encoding = "x-gzip"; | ||
| 23 | +if (isset ($_SERVER['HTTP_ACCEPT_ENCODING']) && | ||
| 24 | + strpos ($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE) | ||
| 25 | +$encoding = "gzip"; | ||
| 26 | + | ||
| 27 | +header ('Content-type: text/plain'); | ||
| 28 | + | ||
| 29 | +$result = FALSE; | ||
| 30 | +if ($encoding !== FALSE) | ||
| 31 | + $result = gzcompress (json_encode (new dummy ( | ||
| 32 | + 'doing gzip', 'gezipedte Daten', 'la zippo'))); | ||
| 33 | + | ||
| 34 | +if ($result !== FALSE) | ||
| 35 | +{ | ||
| 36 | + header ('Content-Encoding: ' . $encoding); | ||
| 37 | + | ||
| 38 | + print ("\x1f\x8b\x08\x00\x00\x00\x00\x00"); | ||
| 39 | + print ($result); | ||
| 40 | +} | ||
| 41 | +else | ||
| 42 | +{ | ||
| 43 | + $result = json_encode (new dummy ( | ||
| 44 | + 'doing no gzip', 'nicht gezipedte Daten', 'no la zippo')); | ||
| 45 | + | ||
| 46 | + print ($result); | ||
| 47 | +} | ||
| 66 | 48 | ||
| 67 | ?> | 49 | ?> |
| @@ -67,7 +67,7 @@ | @@ -67,7 +67,7 @@ | ||
| 67 | 67 | ||
| 68 | // anfrage erstellen (GET, url ist localhost, | 68 | // anfrage erstellen (GET, url ist localhost, |
| 69 | // request ist asynchron | 69 | // request ist asynchron |
| 70 | - var url = 'http://muedv031/~georg/bilder/ajax+json/ajax.php' + | 70 | + var url = 'http://localhost/~georg/bilder/ajax+json_home/ajax.php' + |
| 71 | '?translate=' + document.getElementById ('myword').value; | 71 | '?translate=' + document.getElementById ('myword').value; |
| 72 | 72 | ||
| 73 | req.open("GET", url, true); | 73 | req.open("GET", url, true); |
| @@ -49,7 +49,7 @@ function setErrExceptionMapping () | @@ -49,7 +49,7 @@ function setErrExceptionMapping () | ||
| 49 | { | 49 | { |
| 50 | global $oldErrHandler; | 50 | global $oldErrHandler; |
| 51 | 51 | ||
| 52 | - if ($oldErrHandler == NULL) | 52 | + if ($oldErrHandler === NULL) |
| 53 | $oldErrHandler = set_error_handler ('mapErrToExc'); | 53 | $oldErrHandler = set_error_handler ('mapErrToExc'); |
| 54 | } | 54 | } |
| 55 | 55 | ||
| @@ -57,7 +57,7 @@ function resetErrExceptionMapping () | @@ -57,7 +57,7 @@ function resetErrExceptionMapping () | ||
| 57 | { | 57 | { |
| 58 | global $oldErrHandler; | 58 | global $oldErrHandler; |
| 59 | 59 | ||
| 60 | - if ($oldErrHandler != NULL) | 60 | + if ($oldErrHandler !== NULL) |
| 61 | { | 61 | { |
| 62 | set_error_handler ($oldErrHandler); | 62 | set_error_handler ($oldErrHandler); |
| 63 | $oldErrHandler = NULL; | 63 | $oldErrHandler = NULL; |
libs/mutualExclusion.php
0 → 100644
| 1 | +<?php | ||
| 2 | + | ||
| 3 | +require_once dirname(__FILE__) . '/../config.php'; | ||
| 4 | +require_once LIBDIR . 'errException.php'; | ||
| 5 | + | ||
| 6 | + | ||
| 7 | +function acquireLock ($lockFile, $csId) | ||
| 8 | +{ | ||
| 9 | + $fName = $lockFile . $csId . '.lck'; | ||
| 10 | + $lock = NULL; | ||
| 11 | + | ||
| 12 | + setErrExceptionMapping (); | ||
| 13 | + | ||
| 14 | + $lockHandle = fopen ($fName, 'w'); | ||
| 15 | + | ||
| 16 | + // if available use semaphores for mutual exclusion because flock | ||
| 17 | + // doesn't work reliably in threaded environments. | ||
| 18 | + if (function_exists ('sem_get')) | ||
| 19 | + { | ||
| 20 | + $lock = sem_get (ftok ($fName, $csId), 1, 0644, TRUE); | ||
| 21 | + | ||
| 22 | + $state = sem_acquire ($lock); | ||
| 23 | + while ($state === FALSE) | ||
| 24 | + $state = sem_acquire ($lock); | ||
| 25 | + } | ||
| 26 | + else | ||
| 27 | + { | ||
| 28 | + $state = flock ($lock, LOCK_EX); | ||
| 29 | + while ($state === FALSE) | ||
| 30 | + $state = flock ($lock, LOCK_EX); | ||
| 31 | + } | ||
| 32 | + | ||
| 33 | + // Here one could write informations in the lockfile...time, pid, etc. | ||
| 34 | + fwrite ($lockHandle, session_id () . '::' . time ()); | ||
| 35 | + fflush ($lockHandle); | ||
| 36 | + | ||
| 37 | + resetErrExceptionMapping (); | ||
| 38 | + | ||
| 39 | + $userAbort = ignore_user_abort(TRUE); | ||
| 40 | + return array ($lockHandle, $lock, $userAbort); | ||
| 41 | +} | ||
| 42 | + | ||
| 43 | +function releaseLock ($lock) | ||
| 44 | +{ | ||
| 45 | + setErrExceptionMapping (); | ||
| 46 | + | ||
| 47 | + if ($lock[1] !== NULL) | ||
| 48 | + sem_release ($lock[1]); | ||
| 49 | + | ||
| 50 | + ftruncate ($lock[0], 0); | ||
| 51 | + fclose ($lock[0]); | ||
| 52 | + | ||
| 53 | + resetErrExceptionMapping (); | ||
| 54 | + | ||
| 55 | + ignore_user_abort($lock[2]); | ||
| 56 | +} | ||
| 57 | + | ||
| 58 | +?> |
| 1 | <?php | 1 | <?php |
| 2 | 2 | ||
| 3 | -/* | ||
| 4 | - * Zunächst mal den Gedanken skizziert | ||
| 5 | - * Da es kein wirklich zuverlässiges Locking fuer kritische Bereiche | ||
| 6 | - * in php gibt. Semaphore existiren nur unter Unix und flock arbeitet nicht | ||
| 7 | - * wenn der webserver threaded ist und keine separaten prozesse pro | ||
| 8 | - * request erzeugt habe ich folgenden Gedankengang...nicht 100% Atomar, aber | ||
| 9 | - * möglicherweise das beste was man bekommen kann. | ||
| 10 | - * | ||
| 11 | - * ACQUIRE | ||
| 12 | - * ======= | ||
| 13 | - * | | ||
| 14 | - * - leere Datei erzeugen (tmp) | ||
| 15 | - * - link (tmp) nach (lock) | ||
| 16 | - * | | ||
| 17 | - * |----------------------------- | ||
| 18 | - * OK | | Fehler | | ||
| 19 | - * | | | | ||
| 20 | - * | | - lese (lock): sollte blockieren solange diese leer ist | ||
| 21 | - * | | - unlink (lock) | ||
| 22 | - * | | - link (tmp) nach (lock) | ||
| 23 | - * | Fehler | | | ||
| 24 | - * | ---------------| | ||
| 25 | - * | | OK | ||
| 26 | - * | | | ||
| 27 | - * |----------------------------- | ||
| 28 | - * | | ||
| 29 | - * - (tmp) loeschen | ||
| 30 | - * | | ||
| 31 | - * (ENDE) | ||
| 32 | - * | ||
| 33 | - * RELEASE | ||
| 34 | - * ======= | ||
| 35 | - * | | ||
| 36 | - * - schreibe nach (lock) | ||
| 37 | - * | | ||
| 38 | - * (ENDE) | ||
| 39 | - * | ||
| 40 | - * Da link angeblick atomar ist muesste das zumindest zuverlaessig Sperren... | ||
| 41 | - * Zusaettzlich sollte man vielleicht noch ein Priorisierung irgendwo | ||
| 42 | - * festhalten, um zu verhindern das ein Prozess ewig wartet, weil er immer | ||
| 43 | - * Pech bei der zuweisung von CPU Zeit hat. | ||
| 44 | - * | ||
| 45 | - * So ein Pech, read blockiert natuerlich nicht bei regulären Dateien, da | ||
| 46 | - * ja EOF erreich wird....da muss ich mir was anderes ausdenken.... | ||
| 47 | - * OK, unter UNIX kann ich exec mkfifo machen um eine named pipe zu generieren. | ||
| 48 | - * Fuer windows muss was anderes oder busy waiting (iiieeh) rein.... | ||
| 49 | - * | ||
| 50 | - * !!! Zur info, schon der read open auf eine FIFO blocked wenn kein Writer | ||
| 51 | - * existiert. Das war auch ein aspekt den man berücksichtigen muß... !!! | ||
| 52 | - */ | 3 | +require_once dirname(__FILE__) . '/config.php'; |
| 4 | +require_once LIBDIR . 'mutualExclusion.php'; | ||
| 53 | 5 | ||
| 54 | -function acquire ($lock, $tmp) | ||
| 55 | -{ | ||
| 56 | - if (! file_exists ($tmp)) | ||
| 57 | - exec ('mkfifo ' . $tmp); | ||
| 58 | - // hier koennte irgendwas bzgl. der Priorisierung in nem else folgen... | ||
| 59 | 6 | ||
| 60 | - if (link ($tmp, $lock) === FALSE) | ||
| 61 | - { | ||
| 62 | - while (true) | ||
| 63 | - { | ||
| 64 | - $handle = fopen ($lock, 'w'); | ||
| 65 | - fwrite ($handel, '1'); | ||
| 66 | - fclose ($handle); | ||
| 67 | - if (unlink ($lock) === FALSE) continue; | ||
| 68 | - if (link ($tmp, $lock) === FALSE) continue; | ||
| 69 | - break; | ||
| 70 | - } | ||
| 71 | - } | ||
| 72 | - | ||
| 73 | - unlink ($tmp); | ||
| 74 | -} | ||
| 75 | - | ||
| 76 | -function release ($lock) | ||
| 77 | -{ | ||
| 78 | - $handle = fopen ($lock, 'r'); | ||
| 79 | - stream_set_blocking ($handle, 0); | ||
| 80 | - if (fread ($handle, 1) === 0) | ||
| 81 | - unlink ($lock); | ||
| 82 | - fclose ($handle); | ||
| 83 | -} | ||
| 84 | - | ||
| 85 | - | ||
| 86 | -acquire ('lock', 'tmp'); | 7 | +//session_start (); |
| 8 | +$lock = acquireLock ('lock/lock', '1'); | ||
| 87 | 9 | ||
| 88 | echo "Lock bekommen\n"; | 10 | echo "Lock bekommen\n"; |
| 89 | -sleep (30); | 11 | +sleep (2); |
| 90 | 12 | ||
| 91 | -release ('lock'); | 13 | +releaseLock ($lock); |
| 92 | 14 | ||
| 93 | ?> | 15 | ?> |
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