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#include <mbgl/util/thread_local.hpp>
#include <array>
#include <cassert>
#include <QThreadStorage>
namespace mbgl {
namespace util {
namespace impl {
// QThreadStorage tries to be smart and take ownership of the data, which we don't want. So we're
// wrapping it in another type which doesn't own the pointer it contains.
using StorageType = QThreadStorage<std::array<void*, 1>>;
ThreadLocalBase::ThreadLocalBase() {
static_assert(sizeof(storage) >= sizeof(StorageType), "storage is too small");
static_assert(alignof(decltype(storage)) % alignof(StorageType) == 0, "storage is incorrectly aligned");
new (&reinterpret_cast<StorageType&>(storage)) QThreadStorage<void*>();
}
ThreadLocalBase::~ThreadLocalBase() {
// ThreadLocal will not take ownership of the pointer it is managing. The pointer
// needs to be explicitly cleared before we destroy this object.
assert(!get());
reinterpret_cast<StorageType&>(storage).~QThreadStorage();
}
void* ThreadLocalBase::get() {
return reinterpret_cast<StorageType&>(storage).localData()[0];
}
void ThreadLocalBase::set(void* ptr) {
reinterpret_cast<StorageType&>(storage).setLocalData({{ ptr }});
}
} // namespace impl
} // namespace util
} // namespace mbgl
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