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31 #ifndef ThreadIdentifierDataPthreads_h
32 #define ThreadIdentifierDataPthreads_h
34 #include <wtf/Threading.h>
38 // Holds ThreadIdentifier in the thread-specific storage and employs pthreads-specific 2-pass destruction to reliably remove
39 // ThreadIdentifier from threadMap. It assumes regular ThreadSpecific types don't use multiple-pass destruction.
40 class ThreadIdentifierData {
41 WTF_MAKE_NONCOPYABLE(ThreadIdentifierData);
43 ~ThreadIdentifierData();
45 // One time initialization for this class as a whole.
46 // This method must be called before initialize() and it is not thread-safe.
47 static void initializeOnce();
49 // Creates and puts an instance of ThreadIdentifierData into thread-specific storage.
50 static void initialize(ThreadIdentifier identifier);
52 // Returns 0 if thread-specific storage was not initialized.
53 static ThreadIdentifier identifier();
56 ThreadIdentifierData(ThreadIdentifier identifier)
57 : m_identifier(identifier)
58 , m_isDestroyedOnce(false)
62 // This thread-specific destructor is called 2 times when thread terminates:
63 // - first, when all the other thread-specific destructors are called, it simply remembers it was 'destroyed once'
64 // and re-sets itself into the thread-specific slot to make Pthreads to call it again later.
65 // - second, after all thread-specific destructors were invoked, it gets called again - this time, we remove the
66 // ThreadIdentifier from the threadMap, completing the cleanup.
67 static void destruct(void* data);
69 ThreadIdentifier m_identifier;
70 bool m_isDestroyedOnce;
71 static pthread_key_t m_key;
76 #endif // ThreadIdentifierDataPthreads_h