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How to create a memory leak in Java?
...ring, if the string is a substring, the leak is even worse (the underlying char[] is also leaked) - in Java 7 substring also copies the char[], so the later doesn't apply; @Daniel, no needs for votes, though.
I'll concentrate on threads to show the danger of unmanaged threads mostly, don't wish t...
What does Docker add to lxc-tools (the userspace LXC tools)?
...rface, design philosophy and documentation. By contrast, the lxc helper scripts focus on containers as lightweight machines - basically servers that boot faster and need less ram. We think there's more to containers than just that.
Automatic build. Docker includes a tool for developers to automatica...
What does the brk() system call do?
...;assert.h>
#include <unistd.h>
int main(void) {
void *b;
char *p, *end;
b = sbrk(0);
p = (char *)b;
end = p + 0x1000000;
brk(end);
while (p < end) {
*(p++) = 1;
}
brk(b);
return 0;
}
Tested on Ubuntu 18.04.
Virtual address space visual...
MPICH vs OpenMPI
...of both MPICH and Open-MPI are working on shared-memory, Ethernet (via TCP/IP), Mellanox InfiniBand, Intel Omni Path, and likely other networks. Open-MPI also supports both of these networks and others natively (i.e. without OFI in the middle).
In the past, a common complaint about MPICH is that i...
Differences between socket.io and websockets
... browser:
WebSocket Client
WebSocket client example using vanilla JavaScript:
var l = document.getElementById('l');
var log = function (m) {
var i = document.createElement('li');
i.innerText = new Date().toISOString()+' '+m;
l.appendChild(i);
}
log('opening websocket connection');
var...
How should I choose an authentication library for CodeIgniter? [closed]
...)
Uses potentially unsafe md5 hashing
Failed login attempts only stored by IP, not by username - unsafe!
Autologin key not hashed in the database - practically as unsafe as storing passwords in cleartext!
Role system is a complete mess: is_admin function with hard-coded role names, is_role a complet...
What are the key differences between Apache Thrift, Google Protocol Buffers, MessagePack, ASN.1 and
...ready a JSON library. Again, as with most wheel-reinventing protocol description systems, Avro is also not standardized.
Personally, despite my love/hate relationship with it, I'd probably use ASN.1 for most RPC and message transmission purposes, although it doesn't really have an RPC stack (you'd...
Why in Java 8 split sometimes removes empty strings at start of result array?
... grepcode, for version 7u40-b43 and 8-b132.
Java 7
public String[] split(CharSequence input, int limit) {
int index = 0;
boolean matchLimited = limit > 0;
ArrayList<String> matchList = new ArrayList<>();
Matcher m = matcher(input);
// Add segments before each ma...
Do login forms need tokens against CSRF attacks?
... for privacy violations like that. Perhaps, but to quote the section in Wikipedia's CSRF article:
Login CSRF makes various novel attacks possible; for instance, an
attacker can later log in to the site with his legitimate credentials
and view private information like activity history that ha...
Is “inline” without “static” or “extern” ever useful in C99?
...efore, the following example might not
behave as expected.
inline const char *saddr(void)
{
static const char name[] = "saddr";
return name;
}
int compare_name(void)
{
return saddr() == saddr(); // unspecified behavior
}
Since the implementation might use the inline definition f...