mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 02:18:58 +01:00
90 lines
1.4 KiB
C++
90 lines
1.4 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_CTX_LATCH_H
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namespace ircd::ctx
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{
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class latch;
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}
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class ircd::ctx::latch
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{
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mutable dock d;
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size_t count {0};
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public:
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bool is_ready() const noexcept;
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void count_down(const size_t &n = 1);
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void count_down_and_wait();
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void wait() const;
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latch(const size_t &count);
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latch() = default;
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latch(latch &&);
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latch(const latch &) = delete;
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~latch() noexcept;
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};
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inline
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ircd::ctx::latch::latch(const size_t &count)
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:count{count}
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{}
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inline
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ircd::ctx::latch::latch(latch &&o)
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:d{std::move(o.d)}
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,count{std::move(o.count)}
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{
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o.count = 0;
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}
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inline
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ircd::ctx::latch::~latch()
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noexcept
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{
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assert(d.empty());
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}
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inline void
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ircd::ctx::latch::wait()
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const
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{
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d.wait([this]
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{
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return is_ready();
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});
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}
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inline void
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ircd::ctx::latch::count_down_and_wait()
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{
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if(--count == 0)
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d.notify_all();
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else
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wait();
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}
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inline void
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ircd::ctx::latch::count_down(const size_t &n)
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{
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count -= n;
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if(is_ready())
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d.notify_all();
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}
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inline bool
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ircd::ctx::latch::is_ready()
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const noexcept
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{
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return count == 0;
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}
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