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#include "thread_id.h"
#include <util/system/thread.h>
#ifdef _unix_
#include <library/cpp/yt/misc/static_initializer.h>
#include <pthread.h>
#endif
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
YT_DEFINE_THREAD_LOCAL(TSystemThreadId, CachedSystemThreadId, InvalidSystemThreadId);
YT_DEFINE_THREAD_LOCAL(TSequentialThreadId, CachedSequentialThreadId, InvalidSequentialThreadId);
std::atomic<TSequentialThreadId> SequentialThreadIdGenerator = InvalidSequentialThreadId;
namespace NDetail {
TSystemThreadId GetSystemThreadIdImpl()
{
static_assert(std::is_same_v<TSystemThreadId, ::TThread::TId>);
return ::TThread::CurrentThreadNumericId();
}
} // namespace NDetail
#ifdef _unix_
// The kernel tid is stable for the lifetime of a thread, so we cache it to
// avoid the |gettid| syscall on each call. After a |fork|, however, the
// surviving (calling) thread of the child gets a fresh kernel tid, so the
// cache must be invalidated there.
YT_STATIC_INITIALIZER(
::pthread_atfork(
/*prepare*/ nullptr,
/*parent*/ nullptr,
/*child*/ [] { CachedSystemThreadId() = InvalidSystemThreadId; }));
#endif
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
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