mirror of
https://github.com/matrix-construct/construct
synced 2024-11-15 22:41:12 +01:00
82 lines
1.4 KiB
C++
82 lines
1.4 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_CTX_LATCH_H
|
|
|
|
namespace ircd::ctx
|
|
{
|
|
class latch;
|
|
}
|
|
|
|
class ircd::ctx::latch
|
|
{
|
|
mutable struct dock dock;
|
|
size_t count {0};
|
|
|
|
public:
|
|
bool is_ready() const noexcept;
|
|
void count_down(const size_t &n = 1);
|
|
void count_down_and_wait();
|
|
void wait() const;
|
|
|
|
latch(const size_t &count);
|
|
latch() = default;
|
|
latch(latch &&) = default;
|
|
latch(const latch &) = delete;
|
|
~latch() noexcept;
|
|
};
|
|
|
|
inline
|
|
ircd::ctx::latch::latch(const size_t &count)
|
|
:count{count}
|
|
{}
|
|
|
|
inline
|
|
ircd::ctx::latch::~latch()
|
|
noexcept
|
|
{
|
|
assert(is_ready());
|
|
}
|
|
|
|
inline void
|
|
ircd::ctx::latch::wait()
|
|
const
|
|
{
|
|
dock.wait([this]
|
|
{
|
|
return is_ready();
|
|
});
|
|
}
|
|
|
|
inline void
|
|
ircd::ctx::latch::count_down_and_wait()
|
|
{
|
|
if(--count == 0)
|
|
dock.notify_all();
|
|
else
|
|
wait();
|
|
}
|
|
|
|
inline void
|
|
ircd::ctx::latch::count_down(const size_t &n)
|
|
{
|
|
count -= n;
|
|
if(is_ready())
|
|
dock.notify_all();
|
|
}
|
|
|
|
|
|
inline bool
|
|
ircd::ctx::latch::is_ready()
|
|
const noexcept
|
|
{
|
|
return count == 0;
|
|
}
|