| from libcpp cimport bool | |
| cdef extern from "<semaphore>" namespace "std" nogil: | |
| # Notes on templating: | |
| # Cython doesn't currently support non-class template types so it's | |
| # declared here as a class template. | |
| # counting_semaphore has a default max value anyway, so you typically | |
| # don't need to use the templates. If you do though, then there's a | |
| # few tricks - e.g. you can define a class with a cname of "3" for | |
| # example. | |
| # Note on thread-safety: | |
| # You should use these classes without the GIL. It's very easy | |
| # to deadlock with the GIL, and we're assuming that anyone going | |
| # low enough level to be using semaphores doesn't want the overhead | |
| # of Cython handling GIL safety. | |
| cdef cppclass counting_semaphore[LeastMaxValue=*]: | |
| counting_semaphore(ptrdiff_t desired) | |
| void release() except+ | |
| void release(ptrdiff_t update) except+ | |
| void acquire() except+ | |
| bool try_acquire() | |
| # unfortunately, we don't currently define chrono types | |
| bool try_acquire_for[T](T duration) except+ | |
| bool try_acquire_until[T](T timepoint) except+ | |
| ptrdiff_t max() | |
| cdef cppclass binary_semaphore: | |
| binary_semaphore(ptrdiff_t desired) | |
| void release() except+ | |
| void release(ptrdiff_t update) except+ | |
| void acquire() except+ | |
| bool try_acquire() | |
| # unfortunately, we don't currently define chrono types | |
| bool try_acquire_for[T](T timepoint) except+ | |
| bool try_acquire_until[T](T duration) except+ | |
| ptrdiff_t max() | |