Atmosphere/libraries/libmesosphere/source/kern_k_condition_variable.cpp
2020-07-10 11:55:33 -07:00

90 lines
2.9 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern {
namespace {
constinit KThread g_cv_compare_thread;
}
Result KConditionVariable::SignalToAddress(KProcessAddress addr) {
MESOSPHERE_UNIMPLEMENTED();
}
Result KConditionVariable::WaitForAddress(ams::svc::Handle handle, KProcessAddress addr, u32 value) {
MESOSPHERE_UNIMPLEMENTED();
}
KThread *KConditionVariable::SignalImpl(KThread *thread) {
MESOSPHERE_UNIMPLEMENTED();
}
void KConditionVariable::Signal(uintptr_t cv_key, s32 count) {
/* Prepare for signaling. */
constexpr int MaxThreads = 16;
KLinkedList<KThread> thread_list;
KThread *thread_array[MaxThreads];
int num_to_close = 0;
/* Perform signaling. */
int num_waiters = 0;
{
KScopedSchedulerLock sl;
g_cv_compare_thread.SetupForConditionVariableCompare(cv_key, -1);
auto it = this->tree.nfind(g_cv_compare_thread);
while ((it != this->tree.end()) && (count <= 0 || num_waiters < count) && (it->GetConditionVariableKey() == cv_key)) {
KThread *target_thread = std::addressof(*it);
if (KThread *thread = this->SignalImpl(target_thread); thread != nullptr) {
if (num_to_close < MaxThreads) {
thread_array[num_to_close++] = thread;
} else {
thread_list.push_back(*thread);
}
}
it = this->tree.erase(it);
target_thread->ClearConditionVariable();
++num_waiters;
}
}
/* Close threads in the array. */
for (auto i = 0; i < num_to_close; ++i) {
thread_array[i]->Close();
}
/* Close threads in the list. */
if (num_waiters > MaxThreads) {
auto it = thread_list.begin();
while (it != thread_list.end()) {
KThread *thread = std::addressof(*it);
thread->Close();
it = thread_list.erase(it);
}
}
}
Result KConditionVariable::Wait(KProcessAddress addr, uintptr_t key, u32 value, s64 timeout) {
MESOSPHERE_UNIMPLEMENTED();
}
}