+#include <unrelacy.h>
+#include <atomic>
+#include <mutex>
+#include <condition_variable>
+
class eventcount
{
public:
- eventcount()
- : count(0)
- , waiters(0)
- {}
+ eventcount() : waiters(0)
+ {
+ count = 0;
+ }
void signal_relaxed()
{
- unsigned cmp = count($).load(std::memory_order_relaxed);
+ unsigned cmp = count.load(std::memory_order_relaxed);
signal_impl(cmp);
}
void signal()
{
- unsigned cmp = count($).fetch_add(0, std::memory_order_seq_cst);
+ unsigned cmp = count.fetch_add(0, std::memory_order_seq_cst);
signal_impl(cmp);
}
unsigned get()
{
- unsigned cmp = count($).fetch_or(0x80000000,
+ unsigned cmp = count.fetch_or(0x80000000,
std::memory_order_seq_cst);
return cmp & 0x7FFFFFFF;
}
void wait(unsigned cmp)
{
- unsigned ec = count($).load(std::memory_order_seq_cst);
+ unsigned ec = count.load(std::memory_order_seq_cst);
if (cmp == (ec & 0x7FFFFFFF))
{
guard.lock($);
- ec = count($).load(std::memory_order_seq_cst);
+ ec = count.load(std::memory_order_seq_cst);
if (cmp == (ec & 0x7FFFFFFF))
{
- waiters($) += 1;
- cv.wait(guard, $);
+ waiters += 1;
+ cv.wait(guard);
}
guard.unlock($);
}
private:
std::atomic<unsigned> count;
rl::var<unsigned> waiters;
- mutex guard;
- condition_variable_any cv;
+ std::mutex guard;
+ std::condition_variable cv;
void signal_impl(unsigned cmp)
{
if (cmp & 0x80000000)
{
guard.lock($);
- while (false == count($).compare_swap(cmp,
+ while (false == count.compare_exchange_weak(cmp,
(cmp + 1) & 0x7FFFFFFF, std::memory_order_relaxed));
unsigned w = waiters($);
- waiters($) = 0;
+ waiters = 0;
guard.unlock($);
if (w)
cv.notify_all($);