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add some timeouts to prevent deadlock

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This commit is contained in:
Zach Prezkuta 2012-07-05 19:01:13 -06:00
parent 2edfc3b539
commit 5dcce1ed93
2 changed files with 18 additions and 9 deletions
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15
include/lock.php
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@ -3,11 +3,12 @@
// Provide some ability to lock a PHP function so that multiple processes
// can't run the function concurrently
if(! function_exists('lock_function')) {
function lock_function($fn_name, $block = true, $wait_sec = 2) {
function lock_function($fn_name, $block = true, $wait_sec = 2, $timeout = 30) {
if( $wait_sec == 0 )
$wait_sec = 2; // don't let the user pick a value that's likely to crash the system
$got_lock = false;
$start = time();
do {
q("LOCK TABLE locks WRITE");
@ -33,19 +34,21 @@ function lock_function($fn_name, $block = true, $wait_sec = 2) {
if(($block) && (! $got_lock))
sleep($wait_sec);
} while(($block) && (! $got_lock));
} while(($block) && (! $got_lock) && ((time() - $start) < $timeout));
logger('lock_function: function ' . $fn_name . ' with blocking = ' . $block . ' got_lock = ' . $got_lock, LOGGER_DEBUG);
logger('lock_function: function ' . $fn_name . ' with blocking = ' . $block . ' got_lock = ' . $got_lock . ' time = ' . (time() - $start), LOGGER_DEBUG);
return $got_lock;
}}
if(! function_exists('block_on_function_lock')) {
function block_on_function_lock($fn_name, $wait_sec = 2) {
function block_on_function_lock($fn_name, $wait_sec = 2, $timeout = 30) {
if( $wait_sec == 0 )
$wait_sec = 2; // don't let the user pick a value that's likely to crash the system
$start = time();
do {
$r = q("SELECT locked FROM locks WHERE name = '%s' LIMIT 1",
dbesc($fn_name)
@ -54,7 +57,7 @@ function block_on_function_lock($fn_name, $wait_sec = 2) {
if(count($r) && $r[0]['locked'])
sleep($wait_sec);
} while(count($r) && $r[0]['locked']);
} while(count($r) && $r[0]['locked'] && ((time() - $start) < $timeout));
return;
}}
@ -62,11 +65,9 @@ function block_on_function_lock($fn_name, $wait_sec = 2) {
if(! function_exists('unlock_function')) {
function unlock_function($fn_name) {
//$r = q("LOCK TABLE lock WRITE");
$r = q("UPDATE locks SET locked = 0 WHERE name = '%s' LIMIT 1",
dbesc($fn_name)
);
//$r = q("UNLOCK TABLES");
logger('unlock_function: released lock for function ' . $fn_name, LOGGER_DEBUG);