Provided by: libmojolicious-perl_4.63+dfsg-1_all 
NAME
Mojo::Server::Prefork - Preforking non-blocking I/O HTTP and WebSocket server
SYNOPSIS
use Mojo::Server::Prefork;
my $prefork = Mojo::Server::Prefork->new(listen => ['http://*:8080']);
$prefork->unsubscribe('request');
$prefork->on(request => sub {
my ($prefork, $tx) = @_;
# Request
my $method = $tx->req->method;
my $path = $tx->req->url->path;
# Response
$tx->res->code(200);
$tx->res->headers->content_type('text/plain');
$tx->res->body("$method request for $path!");
# Resume transaction
$tx->resume;
});
$prefork->run;
DESCRIPTION
Mojo::Server::Prefork is a full featured, UNIX optimized, preforking non-blocking I/O HTTP and WebSocket
server, built around the very well tested and reliable Mojo::Server::Daemon, with IPv6, TLS, Comet (long
polling), keep-alive, connection pooling, timeout, cookie, multipart and multiple event loop support.
Note that the server uses signals for process management, so you should avoid modifying signal handlers
in your applications.
For better scalability (epoll, kqueue) and to provide IPv6 as well as TLS support, the optional modules
EV (4.0+), IO::Socket::IP (0.16+) and IO::Socket::SSL (1.75+) will be used automatically by Mojo::IOLoop
if they are installed. Individual features can also be disabled with the MOJO_NO_IPV6 and MOJO_NO_TLS
environment variables.
See Mojolicious::Guides::Cookbook for more.
MANAGER SIGNALS
The Mojo::Server::Prefork manager process can be controlled at runtime with the following signals.
INT, TERM
Shutdown server immediately.
QUIT
Shutdown server gracefully.
TTIN
Increase worker pool by one.
TTOU
Decrease worker pool by one.
WORKER SIGNALS
Mojo::Server::Prefork worker processes can be controlled at runtime with the following signals.
INT, TERM
Stop worker immediately.
QUIT
Stop worker gracefully.
EVENTS
Mojo::Server::Prefork inherits all events from Mojo::Server::Daemon and can emit the following new ones.
finish
$prefork->on(finish => sub {
my ($prefork, $graceful) = @_;
...
});
Emitted when the server shuts down.
$prefork->on(finish => sub {
my ($prefork, $graceful) = @_;
say $graceful ? 'Graceful server shutdown' : 'Server shutdown';
});
heartbeat
$prefork->on(heartbeat => sub {
my ($prefork, $pid) = @_;
...
});
Emitted when a heartbeat message has been received from a worker.
$prefork->on(heartbeat => sub {
my ($prefork, $pid) = @_;
say "Worker $pid has a heartbeat";
});
reap
$prefork->on(reap => sub {
my ($prefork, $pid) = @_;
...
});
Emitted when a child process dies.
$prefork->on(reap => sub {
my ($prefork, $pid) = @_;
say "Worker $pid stopped";
});
spawn
$prefork->on(spawn => sub {
my ($prefork, $pid) = @_;
...
});
Emitted when a worker process is spawned.
$prefork->on(spawn => sub {
my ($prefork, $pid) = @_;
say "Worker $pid started";
});
wait
$prefork->on(wait => sub {
my $prefork = shift;
...
});
Emitted when the manager starts waiting for new heartbeat messages.
$prefork->on(wait => sub {
my $prefork = shift;
my $workers = $prefork->workers;
say "Waiting for heartbeat messages from $workers workers";
});
ATTRIBUTES
Mojo::Server::Prefork inherits all attributes from Mojo::Server::Daemon and implements the following new
ones.
accept_interval
my $interval = $prefork->accept_interval;
$prefork = $prefork->accept_interval(0.5);
Interval in seconds for trying to reacquire the accept mutex, defaults to 0.025. Note that changing this
value can affect performance and idle CPU usage.
accepts
my $accepts = $prefork->accepts;
$prefork = $prefork->accepts(100);
Maximum number of connections a worker is allowed to accept before stopping gracefully, defaults to 1000.
Setting the value to 0 will allow workers to accept new connections indefinitely. Note that up to half of
this value can be subtracted randomly to improve load balancing, and that worker processes will stop
sending heartbeat messages once the limit has been reached.
graceful_timeout
my $timeout = $prefork->graceful_timeout;
$prefork = $prefork->graceful_timeout(15);
Maximum amount of time in seconds stopping a worker gracefully may take before being forced, defaults to
20.
heartbeat_interval
my $interval = $prefork->heartbeat_intrval;
$prefork = $prefork->heartbeat_interval(3);
Heartbeat interval in seconds, defaults to 5.
heartbeat_timeout
my $timeout = $prefork->heartbeat_timeout;
$prefork = $prefork->heartbeat_timeout(2);
Maximum amount of time in seconds before a worker without a heartbeat will be stopped gracefully,
defaults to 20.
lock_file
my $file = $prefork->lock_file;
$prefork = $prefork->lock_file('/tmp/prefork.lock');
Full path of accept mutex lock file prefix, to which the process id will be appended, defaults to a
random temporary path.
lock_timeout
my $timeout = $prefork->lock_timeout;
$prefork = $prefork->lock_timeout(0.5);
Maximum amount of time in seconds a worker may block when waiting for the accept mutex, defaults to 1.
Note that changing this value can affect performance and idle CPU usage.
multi_accept
my $multi = $prefork->multi_accept;
$prefork = $prefork->multi_accept(100);
Number of connections to accept at once, defaults to 50.
pid_file
my $file = $prefork->pid_file;
$prefork = $prefork->pid_file('/tmp/prefork.pid');
Full path of process id file, defaults to a random temporary path.
workers
my $workers = $prefork->workers;
$prefork = $prefork->workers(10);
Number of worker processes, defaults to 4. A good rule of thumb is two worker processes per CPU core.
METHODS
Mojo::Server::Prefork inherits all methods from Mojo::Server::Daemon and implements the following new
ones.
check_pid
my $pid = $prefork->check_pid;
Get process id for running server from "pid_file" or delete it if server is not running.
say 'Server is not running' unless $prefork->check_pid;
run
$prefork->run;
Run server.
SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.
perl v5.18.1 2013-11-30 Mojo::Server::Prefork(3pm)