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sm: implement accurate request deferral semantics

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Michael Scire 2020-12-31 00:29:06 -08:00 • committed by SciresM
parent d42f2e4d1b
commit f768e3c8f9
7 changed files with 196 additions and 75 deletions
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50
libraries/libstratosphere/source/sf/hipc/sf_hipc_server_manager.cpp
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@ -147,62 +147,14 @@ namespace ams::sf::hipc {
return ResultSuccess();
}
void ServerManagerBase::ProcessDeferredSessions() {
/* Iterate over the list of deferred sessions, and see if we can't do anything. */
std::scoped_lock lk(this->deferred_session_mutex);
/* Undeferring a request may undefer another request. We'll continue looping until everything is stable. */
bool needs_undefer_all = true;
while (needs_undefer_all) {
needs_undefer_all = false;
auto it = this->deferred_session_list.begin();
while (it != this->deferred_session_list.end()) {
ServerSession *session = static_cast<ServerSession *>(&*it);
R_TRY_CATCH(this->ProcessForSession(session)) {
R_CATCH(sf::ResultRequestDeferred) {
/* Session is still deferred, so let's continue. */
it++;
continue;
}
R_CATCH(sf::impl::ResultRequestInvalidated) {
/* Session is no longer deferred! */
it = this->deferred_session_list.erase(it);
needs_undefer_all = true;
continue;
}
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
/* We succeeded! Remove from deferred list. */
it = this->deferred_session_list.erase(it);
needs_undefer_all = true;
}
}
}
Result ServerManagerBase::Process(os::WaitableHolderType *holder) {
switch (static_cast<UserDataTag>(os::GetWaitableHolderUserData(holder))) {
case UserDataTag::Server:
return this->ProcessForServer(holder);
break;
case UserDataTag::MitmServer:
return this->ProcessForMitmServer(holder);
break;
case UserDataTag::Session:
/* Try to process for session. */
R_TRY_CATCH(this->ProcessForSession(holder)) {
R_CATCH(sf::ResultRequestDeferred) {
/* The session was deferred, so push it onto the deferred session list. */
std::scoped_lock lk(this->deferred_session_mutex);
this->deferred_session_list.push_back(*static_cast<ServerSession *>(holder));
return ResultSuccess();
}
} R_END_TRY_CATCH;
/* We successfully invoked a command...so let's see if anything can be undeferred. */
this->ProcessDeferredSessions();
return ResultSuccess();
break;
return this->ProcessForSession(holder);
AMS_UNREACHABLE_DEFAULT_CASE();
}
}