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Semaphore¶
Inherits: RefCounted < Object
A synchronization mechanism used to control access to a shared resource by Threads.
Description¶
A synchronization semaphore which can be used to synchronize multiple Threads. Initialized to zero on creation. Be careful to avoid deadlocks. For a binary version, see Mutex.
Tutorials¶
Methods¶
void |
post ( ) |
try_wait ( ) |
|
void |
wait ( ) |
Method Descriptions¶
void post ( )
Lowers the Semaphore, allowing one more thread in.
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.