SlowSem

Files CCore/inc/task/SlowSem.h CCore/src/task/SlowSem.cpp

SlowSem is a semaphore. It is not necessary "slow". This variant is a lightweight wrapper over the OS semaphore. This semaphore is used as a building block in implementations of other synchronization objects.

class SlowSem : public Funchor_nocopy
 {
   Sys::Sem sem;
   
  private:
  
   void init(ulen count);
   
  public: 
   
   // constructors
  
   explicit SlowSem(ulen count=0);
   
   explicit SlowSem(TextLabel name,ulen count=0);
   
   ~SlowSem();
   
   // give
   
   void give();
   
   void give_many(ulen dcount);
   
   // take
   
   bool try_take();
   
   void take();
   
   bool take(MSec timeout);
   
   bool take(TimeScope time_scope); 
    
   // functions
   
   Function<void (void)> function_give() { return FunctionOf(this,&SlowSem::give); }
 };

The implementation of the SlowSem is based on the target-provided Sys::Sem:

struct Sys::Sem
 {
  // private

  ....

  // public
  
  Sys::ErrorType init(ulen count=0);
  
  void exit();
  
  void give();
  
  void give_many(ulen count);
  
  bool try_take();
  
  void take();
  
  bool take(MSec timeout);
 };