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Inherits: :ref:`Reference<class_Reference>` < :ref:`Object<class_Object>`
A synchronization semaphore.
A synchronization semaphore which can be used to synchronize multiple :ref:`Thread<class_Thread>`s. Initialized to zero on creation. Be careful to avoid deadlocks. For a binary version, see :ref:`Mutex<class_Mutex>`.
| void | :ref:`post<class_Semaphore_method_post>` ( ) |
| :ref:`Error<enum_@GlobalScope_Error>` | :ref:`try_wait<class_Semaphore_method_try_wait>` ( ) |
| void | :ref:`wait<class_Semaphore_method_wait>` ( ) |
- void post ( )
Lowers the Semaphore, allowing one more thread in.
- :ref:`Error<enum_@GlobalScope_Error>` try_wait ( )
Like :ref:`wait<class_Semaphore_method_wait>`, but won't block, so if the value is zero, fails immediately and returns :ref:`@GlobalScope.ERR_BUSY<class_@GlobalScope_constant_ERR_BUSY>`. If non-zero, it returns :ref:`@GlobalScope.OK<class_@GlobalScope_constant_OK>` to report success.
- void wait ( )
Waits for the Semaphore, if its value is zero, blocks until non-zero.