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