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#pragma once
#include <utility>
#include <string>
#include <mutex>
#include <atomic>
#include "libipc/def.h"
#include "libipc/mutex.h"
#include "libipc/condition.h"
#include "libipc/platform/detail.h"
namespace ipc {
namespace detail {
class waiter {
ipc::sync::condition cond_;
ipc::sync::mutex lock_;
std::atomic<bool> quit_ {false};
public:
static void init();
waiter() = default;
waiter(char const *name) {
open(name);
}
~waiter() {
close();
}
bool valid() const noexcept {
return cond_.valid() && lock_.valid();
}
bool open(char const *name) noexcept {
quit_.store(false, std::memory_order_relaxed);
if (!cond_.open((std::string{"_waiter_cond_"} + name).c_str())) {
return false;
}
if (!lock_.open((std::string{"_waiter_lock_"} + name).c_str())) {
cond_.close();
return false;
}
return valid();
}
void close() noexcept {
cond_.close();
lock_.close();
}
template <typename F>
bool wait_if(F &&pred, std::uint64_t tm = ipc::invalid_value) noexcept {
IPC_UNUSED_ std::lock_guard<ipc::sync::mutex> guard {lock_};
while ([this, &pred] {
return !quit_.load(std::memory_order_relaxed)
&& std::forward<F>(pred)();
}()) {
if (!cond_.wait(lock_, tm)) return false;
}
return true;
}
bool notify() noexcept {
std::lock_guard<ipc::sync::mutex>{lock_}; // barrier
return cond_.notify(lock_);
}
bool broadcast() noexcept {
std::lock_guard<ipc::sync::mutex>{lock_}; // barrier
return cond_.broadcast(lock_);
}
bool quit_waiting() {
quit_.store(true, std::memory_order_release);
return broadcast();
}
};
} // namespace detail
} // namespace ipc
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