Scroom::Semaphore Class Reference

#include <semaphore.hh>

Collaboration diagram for Scroom::Semaphore:

Public Member Functions
	Semaphore (unsigned int count=0)
void	P ()
void	V ()
template<typename duration_type >
bool	P (duration_type const &rel_time)
bool	try_P ()

Private Attributes
unsigned int	count
boost::condition_variable	cond
boost::mutex	mut

Constructor & Destructor Documentation

Semaphore()

Scroom::Semaphore::Semaphore ( unsigned int  count = 0 )

inlineexplicit

    : count(count_)
  {
  }

Member Function Documentation

P() [1/2]

void Scroom::Semaphore::P ( )

inline

  {
    boost::mutex::scoped_lock lock(mut);
    while(count == 0)
    {
      cond.wait(lock);
    }
    count--;
  }

Referenced by WaitForAsyncOp::operator()(), and A::~A().

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P() [2/2]

template<typename duration_type >

bool Scroom::Semaphore::P ( duration_type const &  rel_time )

inline

  {
    boost::posix_time::ptime const timeout = boost::posix_time::second_clock::universal_time() + rel_time;
 
    boost::mutex::scoped_lock lock(mut);
    while(count == 0)
    {
      if(!cond.timed_wait(lock, timeout))
      {
        return false;
      }
    }
    count--;
    return true;
  }

try_P()

bool Scroom::Semaphore::try_P ( )

inline

  {
    boost::mutex::scoped_lock const lock(mut);
    if(count > 0)
    {
      count--;
      return true;
    }
 
    return false;
  }

V()

void Scroom::Semaphore::V ( )

inline

  {
    boost::mutex::scoped_lock const lock(mut);
    count++;
    cond.notify_one();
  }

Referenced by A::operator()(), B< R >::operator()(), WaitForAsyncOp::operator()(), and A::~A().

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Member Data Documentation

cond

boost::condition_variable Scroom::Semaphore::cond

private

Referenced by P(), P(), and V().

count

unsigned int Scroom::Semaphore::count

private

Referenced by P(), P(), try_P(), and V().

mut

boost::mutex Scroom::Semaphore::mut

private

Referenced by P(), P(), try_P(), and V().

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The documentation for this class was generated from the following file:

• libs/threadpool/inc/scroom/semaphore.hh