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#include "semaphore.h"
namespace AdHoc {
Semaphore::Semaphore(unsigned int initial) : count(initial)
{
}
void
Semaphore::notify()
{
boost::mutex::scoped_lock lock(mutex);
++count;
condition.notify_one();
}
void
Semaphore::wait()
{
boost::mutex::scoped_lock lock(mutex);
while (!count) {
condition.wait(lock);
}
--count;
}
bool
Semaphore::wait(unsigned int timeout)
{
const boost::system_time expiry = boost::get_system_time() + boost::posix_time::milliseconds(timeout);
boost::mutex::scoped_lock lock(mutex);
while (!count) {
if (!condition.timed_wait(lock, expiry)) {
return false;
}
}
--count;
return true;
}
}
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