cCondWait Class Reference

#include <thread.h>

List of all members.

Public Member Functions
	cCondWait (void)
	~cCondWait ()
bool	Wait (int TimeoutMs=0)
void	Signal (void)
	Signals a caller of Wait() that the condition it is waiting for is met.
Static Public Member Functions
static void	SleepMs (int TimeoutMs)

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Detailed Description

Definition at line 17 of file thread.h.

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Constructor & Destructor Documentation

cCondWait::cCondWait

(

void

)

Definition at line 39 of file thread.cpp.

References NULL.

{
  signaled = false;
  pthread_mutex_init(&mutex, NULL);
  pthread_cond_init(&cond, NULL);
}

cCondWait::~cCondWait

(

)

Definition at line 46 of file thread.cpp.

{
  pthread_cond_broadcast(&cond); // wake up any sleepers
  pthread_cond_destroy(&cond);
  pthread_mutex_destroy(&mutex);
}

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Member Function Documentation

void cCondWait::Signal

(

void

)

Signals a caller of Wait() that the condition it is waiting for is met.

Definition at line 81 of file thread.cpp.

{
  pthread_mutex_lock(&mutex);
  signaled = true;
  pthread_cond_broadcast(&cond);
  pthread_mutex_unlock(&mutex);
}

void cCondWait::SleepMs

(

int

TimeoutMs

)

[static]

Creates a cCondWait object and uses it to sleep for TimeoutMs milliseconds, immediately giving up the calling thread's time slice and thus avoiding a "busy wait". In order to avoid a possible busy wait, TimeoutMs will be automatically limited to values >2.

Definition at line 53 of file thread.cpp.

References max(), and Wait().

Referenced by cSmartCardSlot::Action(), cScHousekeeper::Action(), cAction::Action(), cLogStats::Action(), cThread::Cancel(), cPipe::Close(), cSmartCardNagra::Decode(), cSmartCardSlotSerial::DeviceWrite(), cDeCsaTSBuffer::Get(), cSystemNagra2::ProcessECM(), cSystemNagra::ProcessECM(), cCam::Read(), cSmartCardSlot::Reset(), cThread::Start(), and cSmartCardNagra::Update().

{
  cCondWait w;
  w.Wait(max(TimeoutMs, 3)); // making sure the time is >2ms to avoid a possible busy wait
}

bool cCondWait::Wait

(

int

TimeoutMs = 0

)

Waits at most TimeoutMs milliseconds for a call to Signal(), or forever if TimeoutMs is 0.

Returns:

Returns true if Signal() has been called, false it the given timeout has expired.

Definition at line 59 of file thread.cpp.

References GetAbsTime().

Referenced by SleepMs().

{
  pthread_mutex_lock(&mutex);
  if (!signaled) {
     if (TimeoutMs) {
        struct timespec abstime;
        if (GetAbsTime(&abstime, TimeoutMs)) {
           while (!signaled) {
                 if (pthread_cond_timedwait(&cond, &mutex, &abstime) == ETIMEDOUT)
                    break;
                 }
           }
        }
     else
        pthread_cond_wait(&cond, &mutex);
     }
  bool r = signaled;
  signaled = false;
  pthread_mutex_unlock(&mutex);
  return r;
}

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

• sc/include/vdr/thread.h
• sc/thread.cpp