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A condition is used by one thread to signal to other threads that something they were waiting for

has happened. If a single thread was waiting for a condition, it can wake up and proceed with its

execution. If several threads were waiting, they can all wake up and compete for the resource for

which they were waiting.

•    wait/synch/mutex

A mutual exclusion object used to permit access to a resource (such as a section of executable

codę) while preventing other threads from accessing the resource.

•    wait/synch/rwlock

A read/write lock object used to lock a specific variable for access while preventing its use by other

threads. A shared read lock can be acquired simultaneously by multiple threads. Anexclusive

write lock can be acguired by only one thread at a time.