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cdef extern from "pythread.h": 
 
    ctypedef void *PyThread_type_lock 
    ctypedef void *PyThread_type_sema 
 
    void PyThread_init_thread() 
    long PyThread_start_new_thread(void (*)(void *), void *)  # FIXME: legacy
    #unsigned long PyThread_start_new_thread(void (*)(void *), void *)  # returned 'long' before Py3.7
    void PyThread_exit_thread() 
    long PyThread_get_thread_ident()  # FIXME: legacy
    #unsigned long PyThread_get_thread_ident()  # returned 'long' before Py3.7
 
    PyThread_type_lock PyThread_allocate_lock() 
    void PyThread_free_lock(PyThread_type_lock) 
    int PyThread_acquire_lock(PyThread_type_lock, int mode) nogil 
    void PyThread_release_lock(PyThread_type_lock) nogil 
 
    enum: 
        # 'mode' in PyThread_acquire_lock() 
        WAIT_LOCK    #   1 
        NOWAIT_LOCK  #   0 
 
    ctypedef enum PyLockStatus: 
        # return values of PyThread_acquire_lock() in CPython 3.2+ 
        PY_LOCK_FAILURE = 0 
        PY_LOCK_ACQUIRED = 1 
        PY_LOCK_INTR 
 
    size_t PyThread_get_stacksize() 
    int PyThread_set_stacksize(size_t) 
 
    # Thread Local Storage (TLS) API deprecated in CPython 3.7+
    int PyThread_create_key() 
    void PyThread_delete_key(int) 
    int PyThread_set_key_value(int, void *) 
    void * PyThread_get_key_value(int) 
    void PyThread_delete_key_value(int key) 
 
    # Cleanup after a fork 
    void PyThread_ReInitTLS() 

    # Thread Specific Storage (TSS) API in CPython 3.7+ (also backported)
    #ctypedef struct Py_tss_t: pass   # Cython built-in type
    Py_tss_t Py_tss_NEEDS_INIT        # Not normally useful: Cython auto-initialises declared "Py_tss_t" variables.
    Py_tss_t * PyThread_tss_alloc()
    void PyThread_tss_free(Py_tss_t *key)
    int PyThread_tss_is_created(Py_tss_t *key)
    int PyThread_tss_create(Py_tss_t *key)
    void PyThread_tss_delete(Py_tss_t *key)
    int PyThread_tss_set(Py_tss_t *key, void *value)
    void * PyThread_tss_get(Py_tss_t *key)