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Class core.sync.semaphore.Semaphore

This class represents a general counting semaphore as concieved by Edsger Dijkstra. As per Mesa type monitors however, "signal" has been replaced with "notify" to indicate that control is not transferred to the waiter when a notification is sent.

class Semaphore ;


this Initializes a semaphore object with the specified initial count.


m_hndl core.sys.posix.semaphore.sem_tHandle to the system-specific semaphore.


notify Atomically increment the current count by one. This will notify one waiter, if there are any in the queue.
tryWait If the current count is equal to zero, return. Otherwise, atomically decrement the count by one and return true.
wait Wait until the current count is above zero, then atomically decrement the count by one and return.
wait Suspends the calling thread until the current count moves above zero or until the supplied time period has elapsed. If the count moves above zero in this interval, then atomically decrement the count by one and return true. Otherwise, return false.
factory Create instance of class specified by the fully qualified name classname. The class must either have no constructors or have a default constructor.
opCmp Compare with another Object obj.
opEquals Test whether this is equal to o. The default implementation only compares by identity (using the is operator). Generally, overrides for opEquals should attempt to compare objects by their contents.
toHash Compute hash function for Object.
toString Convert Object to a human readable string.


Handle Aliases the operating-system-specific semaphore type.


Sean Kelly


Boost License 1.0