Class reference
Semaphore
Inherits RefCounted
A synchronization mechanism used to control access to a shared resource by Threads.
Description
A synchronization semaphore that can be used to synchronize multiple Threads. Initialized to zero on creation. For a binary version, see Mutex. Warning: Semaphores must be used carefully to avoid deadlocks. Warning: To guarantee that the operating system is able to perform proper cleanup (no crashes, no deadlocks), these conditions must be met: - When a Semaphore's reference count reaches zero and it is therefore destroyed, no threads must be waiting on it. - When a Thread's reference count reaches zero and it is therefore destroyed, it must not be waiting on any semaphore.
Methods
void post(int count = 1)
int count = 1)Lowers the Semaphore, allowing one thread in, or more if count is specified.
bool try_wait()
bool try_wait()Like wait(), but won't block, so if the value is zero, fails immediately and returns false. If non-zero, it returns true to report success.
void wait()
Waits for the Semaphore, if its value is zero, blocks until non-zero.