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cdef extern from "<barrier>" namespace "std" nogil:
# Note on thread safety:
# For any of the blocking functions here you should be very
# careful to ensure that you are not deadlocked on the GIL.
cdef cppclass barrier[CompletionFunction = *]:
cppclass arrival_token:
pass
barrier(ptrdiff_t expected) except+
# We *really* advise that CompletionFunction is nogil (but because it's a template, can't enforce it)
barrier(ptrdiff_t expected, CompletionFunction f) except+
arrival_token arrive() except+
arrival_token arrive(ptrdiff_t n) except+
void wait(arrival_token t) except+
void arrive_and_wait() except+
void arrive_and_drop() except+
ptrdiff_t max()
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