大约有 9,000 项符合查询结果（耗时：0.0385秒） [XML]
Why does pthread_cond_wait have spurious wakeups?
...
There are at least two things 'spurious wakeup' could mean:
A thread blocked in pthread_cond_wait can return from the call even though no call to pthread_call_signal or pthread_cond_broadcast on the condition occurred.
A thread blocked in pthread_cond_wait returns because of a call to pthread_...
How do I create a parameterized SQL query? Why Should I?
...ple would do this through a server side programming language library, like PHP's PDO or Perl DBI.
For instance, in PDO:
$dbh=pdo_connect(); //you need a connection function, returns a pdo db connection
$sql='insert into squip values(null,?,?)';
$statement=$dbh->prepare($sql);
$data=array('my...
Convert PDF to clean SVG? [closed]
...the reason I want this is because I want to be able to edit the text using PHP. I could do it directly with PDF, but PDF can't be inlined easily into HTML, but SVG can. I may just stick with PDF and convert it to JPG in PHP after editing it's values..
– DanRedux
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What is the use of printStackTrace() method in Java?
...n it, printStackTrace is called on the IOException object in the catch block.
What does printStackTrace() actually do?
...
Ruby class instance variable vs. class variable
...:doll
joey.shared_things << :puzzle
suzy.shared_things << :blocks
p Parent.family_things #=> [:house, :vacuum]
p Child.family_things #=> [:house, :vacuum]
p papa.family_things #=> [:house, :vacuum]
p mama.family_things #=> [:house, :vacuum]
p joey.family_things #=...
How to vertically align into the center of the content of a div with defined width/height?
...tical-align:middle;
}
Live DEMO
Version 2: Parent div with display block and content display table-cell
.area{
height: 100px;
width: 100px;
background: red;
margin:10px;
text-align: center;
display:block;
}
.content {
height: 100px;
width: 100px;
display...
Can an int be null in Java?
...ck() is declared to return int, it can never be null and the whole if-else block is then superfluous.
int data = check(Node root);
// do something
Autoboxing problems doesn't apply here as well when check() is declared to return int. If it had returned Integer, then you may risk NullPointerExcep...
With Spring can I make an optional path variable?
...
Spring 5 / Spring Boot 2 examples:
blocking
@GetMapping({"/dto-blocking/{type}", "/dto-blocking"})
public ResponseEntity<Dto> getDtoBlocking(
@PathVariable(name = "type", required = false) String type) {
if (StringUtils.isEmpty(type)) {
...
How to overlay images
...pic{
width:140px;
text-decoration:none;
position:relative;
display:block;
border:1px solid #666;
padding:3px;
margin-right:5px;
float:left;
}
a.gallerypic span.zoom-icon{
visibility:hidden;
position:absolute;
left:40%;
top:35%;
filter:alpha(opacity=50);
-moz-opacity:0.5;...
How can I propagate exceptions between threads?
... way to "stop caring about" a std::future; even its destructor will simply block until the task is done. [EDIT, 2017: The blocking-destructor behavior is a misfeature only of the pseudo-futures returned from std::async, which you should never use anyway. Normal futures don't block in their destructo...