yaojingguo
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最新评论
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fuliang：
more cleanner than before
Big Integer Arithmetic -
yaojingguo：
Hi, Liang LiangThanks for the i ...
Redirect and restore stdout in C -
fuliang：
使用gcc编译.cpp,可以使用-lstdc++选项，这样gc ...
Redirect and restore stdout in C
文章列表
class A {
}
class B extends A {
}
public class Usage {
public static void main(String[] args) {
A[] aArr1 = new A[1];
A[] aArr2 = new B[1];
aArr1[0] = new B();
B[] bArr1 = (B[]) aArr2;
B[] bArr3 = new B[1];
aArr1 = bArr3;
B[] bArr2 = (B[]) aArr1;
}
}
...
The following code print null. If using InheritableThreadLocal, it print main.
class A {
//static ThreadLocal local = new InheritableThreadLocal();
static ThreadLocal local = new ThreadLocal();
}
public class Sample {
public static void main (String [] args) {
A.local.set(&qu ...
When doing development work with Java project whose's classpath is complex, I need to make sure which classpath is appended to CLASSPATH before others. Here is the rule:
1. output folder is appended first.
2. Other classpathentries are appended as the order that they are listed in .classpath. The o ...
I can't login to http://bugs.sun.com/ these days. So I write it here for reference. In line 39 of ThreadLocal.java (http://download.oracle.com/javase/6/docs/api/java/lang/ThreadLocal.html), uniqueId should be uniqueNum. The following code shows the reason.
import java.util.concurrent.atomic.Atom ...
Runnable version of sample code in Exchanger's javadoc.
import java.util.concurrent.Exchanger;
public class FillAndEmpty {
static String PART = "abcde";
static int PART_LEN = 5;
static int STEP_COUNT = 10;
Exchanger<StringBuilder> exchanger = new Exchanger< ...
Runnable version of Solver sample code in CyclicBarrier's javadoc.
import java.util.concurrent.*;
public class Solver {
final int N;
final float[][] data;
final CyclicBarrier barrier;
class Worker implements Runnable {
int myRow;
Worker(int row) { myRow = row; }
...
import java.util.concurrent.atomic.*;
class Container {
public volatile int no;
}
class Task extends Thread {
private AtomicIntegerFieldUpdater<Container> updater =
AtomicIntegerFieldUpdater.newUpdater(Container.class, "no");
private Container c;
public Ta ...
timer in libevent
- 博客分类：
- C/C++
#include <event.h>
#include <stdio.h>
#include <time.h>
static void
hello(int fd, short event, void *arg)
{
printf("hello man\n");
}
int main(int argc, const char *argv[])
{
struct event_base *base;
struct timeval tm;
struct event evt;
...
This is little script shows the usage of $#, $* and $@ in bash.
#!/bin/bash
function countargs {
echo "$# args."
}
echo "$*"
countargs "$*"
countargs "$@"
#include <stdio.h>
#include <stdlib.h>
/*
* str is a literal. So it is allocated in readonly segment. It is OK to return
* it. But the data pointed by the pointer can't be modified.
*/
char *static_pointer_return()
{
char *str = "world";
return str;
}
...
http://stackoverflow.com/questions/3332917/hadoop-job-fails-when-invoked-by-cron
Sample code showing some tricks of C macro usage.
#include <stdio.h>
/*
* Argument concatenation
*/
#define concatenate(front, back) front ## back
/*
* GNU C extension. Refer to
* http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_4.html#SEC76
*/
#define gnu_eprintf(for ...
Make the tail queue sample in man page work.
#include <sys/queue.h>
#include <stdlib.h>
#include <stdio.h>
int main(int argc, const char *argv[])
{
TAILQ_HEAD(tailhead, entry) head;
struct tailhead *headp;
headp = &head;
struct entry {
...
http://www.network-theory.co.uk/docs/gccintro/gccintro_21.html
And library specified by LD_LIBRARY_PATH take precedence over system library directories.
There is no documentation download on http://monkey.org/~provos/libevent/ and its sourceforge project web site. To generate libevent documentation by yourself, follow the following steps.
git clone git://levent.git.sourceforge.net/gitroot/levent/levent
./autogen.sh
./configure
./make doxyge ...