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ircd: Add infrastructure to handle continuation notification after suspending.

This commit is contained in:
Jason Volk 2019-06-05 15:06:16 -07:00
parent 855a5f5a1e
commit f702520044
4 changed files with 80 additions and 16 deletions

View file

@ -46,3 +46,10 @@ server configuration et al is moved to `SIGUSR1`.
This signal commands the server to reload and refresh various aspects of its
configuration and running state.
##### SIGCONT
This signal is used to notify the server that execution has resumed after an
unexpected gap. We call `ircd::cont()` after receiving this signal. Examples
for when the server benefits from calling `ircd::cont()` are: after a previous
stop signal, debugging, or ACPI suspend and resume, etc.

View file

@ -18,6 +18,7 @@ namespace construct
{
namespace ph = std::placeholders;
static void handle_cont();
static void handle_usr1();
static void handle_quit();
static void handle_interrupt();
@ -40,6 +41,7 @@ construct::signals::signals(boost::asio::io_context &ios)
signal_set->add(SIGQUIT);
signal_set->add(SIGTERM);
signal_set->add(SIGUSR1);
signal_set->add(SIGCONT);
set_handle();
}
@ -115,11 +117,12 @@ construct::handle_signal(const int &signum)
{
switch(signum)
{
case SIGINT: return handle_interrupt();
case SIGHUP: return handle_hangup();
case SIGINT: return handle_interrupt();
case SIGQUIT: return handle_quit();
case SIGTERM: return handle_quit();
case SIGUSR1: return handle_usr1();
case SIGCONT: return handle_cont();
default: break;
}
@ -129,20 +132,6 @@ construct::handle_signal(const int &signum)
};
}
void
construct::handle_quit()
try
{
ircd::quit();
}
catch(const std::exception &e)
{
ircd::log::error
{
"SIGQUIT handler: %s", e.what()
};
}
void
construct::handle_hangup()
try
@ -181,6 +170,20 @@ catch(const std::exception &e)
};
}
void
construct::handle_quit()
try
{
ircd::quit();
}
catch(const std::exception &e)
{
ircd::log::error
{
"SIGQUIT handler: %s", e.what()
};
}
void
construct::handle_usr1()
try
@ -219,3 +222,17 @@ catch(const std::exception &e)
"SIGUSR1 handler: %s", e.what()
};
}
void
construct::handle_cont()
try
{
ircd::cont();
}
catch(const std::exception &e)
{
ircd::log::error
{
"SIGCONT handler: %s", e.what()
};
}

View file

@ -69,8 +69,10 @@
namespace ircd
{
seconds uptime();
void init(boost::asio::io_context &ios, const string_view &origin, const string_view &hostname);
void cont() noexcept;
bool quit() noexcept;
void init(boost::asio::io_context &ios, const string_view &origin, const string_view &hostname);
extern conf::item<bool> restart;
extern conf::item<bool> debugmode;

View file

@ -201,6 +201,44 @@ noexcept
return false;
}
/// Notifies IRCd that execution is being resumed after a significant gap.
/// Basically this is connected to a SIGCONT handler and beneficial after
/// user stops, debugging and ACPI suspensions, etc. It is not required at
/// this time, but its connection is advised for best behavior.
void
ircd::cont()
noexcept
{
log::debug
{
"IRCd cont requested from runlevel:%s ctx:%p main_context:%p",
reflect(run::level),
(const void *)ctx::current,
(const void *)main_context
};
switch(run::level)
{
case run::level::HALT:
case run::level::READY:
case run::level::FAULT:
return;
case run::level::START:
case run::level::QUIT:
return;
case run::level::RUN:
break;
}
log::notice
{
"IRCd resuming service in runlevel:%s.",
reflect(run::level),
};
}
/// Main context; Main program. Do not call this function directly.
///
/// This function manages the lifetime for all resources and subsystems