提升进程间匿名条件timed_wait不可编译

Question

我想知道我做错了什么......只用wait编译并运行，但不是timed_wait：

using boost::interprocess::scoped_lock;
using boost::interprocess::interprocess_mutex;
using boost::posix_time::milliseconds;

[...]

scoped_lock<interprocess_mutex> lock(obj->mutex);
while (...) {
   obj->condition.timed_wait(lock, milliseconds(100));
}

其中obj->mutex是boost::interprocess::interprocess_mutex而obj->condition是boost::interprocess::interprocess_condition。这是g ++错误日志：

code.cpp: In member function ‘[...]’:
code.cpp:42: error: no matching function for call to ‘boost::interprocess::interprocess_condition::timed_wait(boost::interprocess::scoped_lock<boost::interprocess::interprocess_mutex>&, boost::posix_time::milliseconds)

而这是条件类成员函数的原型（boost / interprocess / sync / interprocess_condition.hpp）：

template <typename L, typename Pr>
   bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time, Pr pred)

（提升1.40）

Answer 1

感谢一个好的#boost IRC用户（mjcaisse），我现在有一个线索：timed_wait需要一个绝对时间。

bool noTimeout = true;
boost::system_time timeout = boost::get_system_time() + milliseconds(10);
while (!noTimeout && [CONDITION NOT MET])
{
   noTimeout = obj->condition.timed_wait(lock, timeout);
}

if (!noTimeout)
{
   std::cout << "timeout!" << std::endl;
}