c++ - About boost::lock_guard and boost::unique_lock -


i hoping tell me if understanding on following 3 locks correct , possibly add it. main concern speed minimum overhead.

  • boost::lock_guard
  • boost::unique_lock
  • boost::scoped_lock

boost::lock_guard lightest kind of lock , shared amongst members of process. unique_lock improved version of lock_guard more functionality. scoped_lock allows locking across different processes.the scoped_lock heaviest of locks.is understanding correct. thread here states scoped_lock similar unique_lock. if mean scoped_lock heavy unique_lock ?

if mean heavy amount of overhead, yes scoped_lock heavy unique_lock, because they're same thing. according this, unique lock has few more features lock_guard, @ expense of bit of overhead.


Comments

Post a Comment

Popular posts from this blog

php - cannot display multiple markers in google maps v3 from traceroute result -

i'm newbie in php mysql , google maps v3. have problems in google maps v3. made traceroute web based , map traceroute's result in google maps v3 final project of college education. have try many tutorials didn't work. have tried tutorials in forum nothing worked. problem cannot display multiple markers got location data database. maybe because i'm newbie , not know how do. confuse looping show markers. here code <?php error_reporting(e_all ^ (e_notice)); ini_set('max_execution_time', 360); $enable_log_user = false; global $ip, $host_name, $host_ip; $host = @$_post['host']; $trace = @$_post['trace']; $self = $_server['php_self']; include("phpsqlajax_dbinfo.php"); $connection = mysql_connect ('127.0.0.1', $username, $password); if (!$connection) { die('not connected : ' . mysql_error());} $db_selected = mysql_select_db($database, $connection); if (!$db_selected) { die ('can\'t use db : ...
Read more

php - Boolean search on database with 5 million rows, very slow -

i have script when user searches "apples", there coloumn related searches "shiny apples", , "rotten apples", etc. problem searches database has 5,600,000 rows , mysql lagging badly. here code: $get = mysql_query("select keyword searches match (keyword) against ('".mysql_real_escape_string(preg_replace('#([\s]+)#', '$1', $title))."' in boolean mode) limit 0,15"); this taking long time process , have active website searches getting performed every second, can recommend me tips? thanks! you need indexes. have had experiences in past creating indexes got significant performance gain.
Read more

css - Text drops down with smaller window -

i've adapted css use in website , can't quite figure out why 1 aspect of page acting way acting. basically, when shrink window below size horizontally, of text "drops down". becomes issue if user viewing website through ipad vertical orientation. can view issue here . i'm hoping make if window gets smaller, placement of text remains intact. the problem area not have enough space put both side navigation , content on 1 line. make automatically adjust page's width when exceeds decrements of width. this code example, , highly unlikely work. if see css more clearly, provide exact code. @media , (max-width:960px) { /* assuming #wrapper 960px across */ #content {width:560px;} /* opposed 720px */ } edit the content drops down @ 980px, have shrink width after there. @media , (max-width:980px) { #container {width:520px;} }
Read more