41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
#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<std::array<void*, 1>>();
|
|
}
|
|
|
|
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() const {
|
|
return reinterpret_cast<const StorageType&>(storage).localData()[0];
|
|
}
|
|
|
|
void ThreadLocalBase::set(void* ptr) {
|
|
reinterpret_cast<StorageType&>(storage).setLocalData({{ptr}});
|
|
}
|
|
|
|
} // namespace impl
|
|
} // namespace util
|
|
} // namespace mbgl
|