Semaphore Class Reference

#include <thread.h>

Public Member Functions
	Semaphore ()
	Semaphore (unsigned count0)
void	wait ()
void	post ()

Private Attributes
Lock	lock
ConditionVariable	cond
unsigned	count
unsigned	waiting

Detailed Description

Definition at line 111 of file thread.h.

Constructor & Destructor Documentation

Semaphore() [1/2]

Semaphore::Semaphore ( )

inline

Definition at line 118 of file thread.h.

              : lock(), cond(&lock), count(0), waiting(0) {
  }

Semaphore() [2/2]

Semaphore::Semaphore ( unsigned  count0 )

inline

Definition at line 120 of file thread.h.

                             : lock(), cond(&lock), count(count0), waiting(0) {
  }

Member Function Documentation

post()

void Semaphore::post

(

)

Definition at line 33 of file thread.cc.

                     {
  lock.lock();
  if (count++ == 0 && waiting)
    cond.signal();
  lock.unlock();
}

wait()

void Semaphore::wait

(

)

Definition at line 23 of file thread.cc.

                     {
  lock.lock();
  waiting++;
  while (count == 0)
    cond.wait();
  waiting--;
  count--;
  lock.unlock();
}

Field Documentation

cond

ConditionVariable Semaphore::cond

private

Definition at line 114 of file thread.h.

count

unsigned Semaphore::count

private

Definition at line 115 of file thread.h.

lock

Lock Semaphore::lock

private

Definition at line 113 of file thread.h.

waiting

unsigned Semaphore::waiting

private

Definition at line 116 of file thread.h.

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

• Singular/dyn_modules/systhreads/thread.h
• Singular/dyn_modules/systhreads/thread.cc