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What is Node.js? [closed]
...s is EVENT BASED and ASYNCHRONOUS / NON-BLOCKING. Events, like an incoming HTTP connection will fire off a JavaScript function that does a little bit of work and kicks off other asynchronous tasks like connecting to a database or pulling content from another server. Once these tasks have been kicked...
Please explain the exec() function and its family
...s was used quite a lot (and still is) for daemons which simply listen on a TCP port and fork a copy of themselves to process a specific request while the parent goes back to listening. For this situation, the program contains both the parent and the child code.
Similarly, programs that know they're ...
How to create a new database after initally installing oracle database 11g Express Edition?
...ho diagnostic_dest=%db_dir%>>%init_file%
echo dispatchers='(protocol=tcp) (service=%app_name%xdb)'>>%init_file%
echo shared_servers=4>>%init_file%
echo open_cursors=300>>%init_file%
echo remote_login_passwordfile='exclusive'>>%init_file%
echo undo_management=auto>>...
java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...tion SID. Both SID are different.
So ORACLE session is nothing but a jdbc(tcp) connection; which is nothing but one SID.
If we set maximum cursors as 500 then it is only for one JDBC session/connection/SID.
So we can have many JDBC connection with its respective no of cursors (statements).
Once t...
Why does one use dependency injection?
... want to log to the console, sometimes to the file system, sometimes using TCP/IP and a remote logging server, and so on ...
And of course you do NOT want to change all your code (meanwhile you have gazillions of it) and replace all lines
var logger = new Logger();
by:
var logger = new TcpLogge...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...ermination condition.
; ...snip...
L6:
mov ecx, edi
mov DWORD PTR [esp], eax
add esi, 1000000000
call __ZNSo3putEc
sub esp, 4
mov ecx, eax
call __ZNSo5flushEv
cmp esi, -1294967296 // here it is
jne L7
lea esp, [ebp-16]
xor eax, eax
pop ecx
...
What are the basic rules and idioms for operator overloading?
...tor * and the binary infix pointer member access operator ->:
class my_ptr {
value_type& operator*();
const value_type& operator*() const;
value_type* operator->();
const value_type* operator->() const;
};
Note that these, too, will almost always need both a c...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...理念1. 空间换时间1) 多级缓存，静态化客户端页面缓存（http header中包含Expires Cache of Control，last modified(304，...一、 设计理念
1. 空间换时间
1) 多级缓存，静态化
客户端页面缓存（http header中包含Expires/Cache of Control，last modifi...
Callback functions in C++
...
typedef typename std::remove_reference<T>::type TR;
std::unique_ptr<char, void(*)(void*)> own
(abi::__cxa_demangle(typeid(TR).name(), nullptr,
nullptr, nullptr), std::free);
std::string r = own != nullptr?own.get():typeid(TR).name();
if (std::is_const<TR>::value)
...
print call stack in C or C++
...c_name(&cursor, sym, sizeof(sym), &offset) == 0) {
char* nameptr = sym;
int status;
char* demangled = abi::__cxa_demangle(sym, nullptr, nullptr, &status);
if (status == 0) {
nameptr = demangled;
}
std::printf(" (%s+0x%lx)\n", nameptr, offset);
...