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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "handle_manager.h"
#include <cassert>
namespace vespalib::portal {
void
HandleGuard::unlock()
{
if (valid()) {
_manager->unlock(_handle);
_manager = nullptr;
_handle = 0;
}
}
HandleGuard::~HandleGuard()
{
unlock();
}
//-----------------------------------------------------------------------------
HandleManager::Entry::~Entry()
{
assert(use_cnt == 0);
assert(wait_cnt == 0);
}
void
HandleManager::unlock(uint64_t handle)
{
std::lock_guard guard(_lock);
auto pos = _repo.find(handle);
assert(pos != _repo.end());
--pos->second.use_cnt;
if (pos->second.should_notify()) {
pos->second.cond.notify_all();
}
}
HandleManager::HandleManager()
: _lock(),
_next_handle(1),
_repo()
{
}
HandleManager::~HandleManager() = default;
size_t
HandleManager::size() const
{
std::lock_guard guard(_lock);
return _repo.size();
}
uint64_t
HandleManager::create()
{
std::lock_guard guard(_lock);
uint64_t handle = _next_handle++;
_repo[handle];
return handle;
}
HandleGuard
HandleManager::lock(uint64_t handle)
{
std::lock_guard guard(_lock);
auto pos = _repo.find(handle);
if (pos == _repo.end()) {
return HandleGuard();
}
if (pos->second.disable) {
return HandleGuard();
}
++pos->second.use_cnt;
return HandleGuard(*this, handle);
}
bool
HandleManager::destroy(uint64_t handle)
{
std::unique_lock guard(_lock);
auto pos = _repo.find(handle);
if (pos == _repo.end()) {
return false;
}
pos->second.disable = true;
++pos->second.wait_cnt;
while (pos->second.use_cnt > 0) {
pos->second.cond.wait(guard);
}
--pos->second.wait_cnt;
if (pos->second.should_erase()) {
_repo.erase(pos);
return true;
}
return false;
}
} // namespace vespalib::portal
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