SharedMutex
C++ concepts: SharedMutex
The SharedMutex concept extends the Mutex concept to include shared lock ownership mode.
Requirements
Mutex
Additionally, for object m of SharedMutex type supports another mode of ownership: shared. Multiple threads (or, more generally, execution agents) can simulataneously own this mutex in shared mode, but no thread may obtain shared ownership if there is a thread that owns it in exclusive mode and no thread may obtain exclusive ownership if there is a thread that owns it in shared mode. If more than implementation-defined number of threads (no less than 10000) hold a shared lock, another attempt to acquire the mutex in shared mode blocks until the number of shared owners drops down below that threshold.
- The expression
m.lock_shared()has the following properties
Library types
The following standard library types satisfy SharedMutex:
std::shared_mutex(since C++17)
See also
- Thread support library
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