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Code Issues Releases Wiki Activity

ircd::mods: Add unloading state; add public interface for loading()/unloading() query.

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This commit is contained in:
Jason Volk 2018-10-23 10:59:16 -07:00
parent 5fa42b5afd
commit 15b300657f
3 changed files with 49 additions and 11 deletions
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2
include/ircd/mods/mods.h
View file

@ -46,6 +46,8 @@ namespace ircd::mods
namespace ircd::mods
{
bool loaded(const string_view &name);
bool loading(const string_view &name);
bool unloading(const string_view &name);
bool available(const string_view &name);
bool is_module(const string_view &fullpath);
bool is_module(const string_view &fullpath, std::nothrow_t);

57
ircd/mods.cc
View file

@ -191,6 +191,30 @@ ircd::mods::available(const string_view &name)
return !search(name, why).empty();
}
bool
ircd::mods::unloading(const string_view &name)
{
const auto &list(mod::unloading);
return end(list) != std::find_if(begin(list), end(list), [&name]
(const auto *const &mod)
{
assert(mod);
return mod->name() == name;
});
}
bool
ircd::mods::loading(const string_view &name)
{
const auto &list(mod::loading);
return end(list) != std::find_if(begin(list), end(list), [&name]
(const auto *const &mod)
{
assert(mod);
return mod->name() == name;
});
}
bool
ircd::mods::loaded(const string_view &name)
{
@ -675,6 +699,10 @@ decltype(ircd::mods::mod::loading)
ircd::mods::mod::loading
{};
decltype(ircd::mods::mod::unloading)
ircd::mods::mod::unloading
{};
decltype(ircd::mods::mod::loaded)
ircd::mods::mod::loaded
{};
@ -818,17 +846,7 @@ bool ircd::mapi::static_destruction;
ircd::mods::mod::~mod()
noexcept try
{
log::debug
{
log, "Attempting unload module '%s' @ `%s'",
name(),
location()
};
unload();
const size_t erased(loaded.erase(name()));
assert(erased == 1);
}
catch(const std::exception &e)
{
@ -849,6 +867,20 @@ ircd::mods::mod::unload()
if(!handle.is_loaded())
return false;
if(mods::unloading(name()))
return false;
// Mark this module in the unloading state.
unloading.emplace_front(this);
log::debug
{
log, "Attempting unload module '%s' @ `%s'",
name(),
location()
};
// Call the user's unloading function here.
if(header->fini)
header->fini();
@ -860,6 +892,8 @@ ircd::mods::mod::unload()
std::for_each(rbegin(this->children), rend(this->children), []
(mod *const &ptr)
{
// Only trigger an unload if there is one reference remaining to the module,
// in addition to the reference created by invoking shared_from() right here.
if(shared_from(*ptr).use_count() <= 2)
ptr->unload();
});
@ -874,7 +908,8 @@ ircd::mods::mod::unload()
mapi::static_destruction = false;
handle.unload();
assert(!handle.is_loaded());
loaded.erase(name());
unloading.remove(this);
if(!mapi::static_destruction)
{
log.critical("Module \"%s\" is stuck and failing to unload.", name());

1
ircd/mods.h
View file

@ -41,6 +41,7 @@ struct ircd::mods::mod
:std::enable_shared_from_this<mod>
{
static std::forward_list<mod *> loading; // State of current dlopen() recursion.
static std::forward_list<mod *> unloading; // dlclose() is not recursive but we have this
static std::map<string_view, mod *, std::less<>> loaded;
filesystem::path path;