mirror of
https://github.com/matrix-construct/construct
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101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/*
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* charybdis: oh just a little chat server
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* ctx.h: userland context switching (stackful coroutines)
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*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#define HAVE_IRCD_CTX_CONTEXT_H
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namespace ircd {
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namespace ctx {
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const size_t DEFAULT_STACK_SIZE
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{
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64_KiB
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};
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struct context
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{
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enum flags
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{
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POST = 0x0001, // Defers spawn with an ios.post()
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DISPATCH = 0x0002, // (Defers) spawn with an ios.dispatch()
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DETACH = 0x0010, // Context deletes itself; see struct context constructor notes
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INTERRUPTED = 0x0020, // Marked
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};
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private:
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std::unique_ptr<ctx> c;
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public:
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operator const ctx &() const { return *c; }
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operator ctx &() { return *c; }
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bool operator!() const { return !c; }
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operator bool() const { return bool(c); }
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bool joined() const { return !c || ircd::ctx::finished(*c); }
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void interrupt() { ircd::ctx::interrupt(*c); }
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void join(); // Blocks the current context until this one finishes
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ctx *detach(); // other calls undefined after this call
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// Note: Constructing with DETACH flag makes any further use of this object undefined.
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context(const char *const &name,
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const size_t &stack_size,
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const flags &,
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std::function<void ()>);
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context(const char *const &name,
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const size_t &stack_size,
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std::function<void ()>,
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const flags & = (flags)0);
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context(const char *const &name,
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const flags &,
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std::function<void ()>);
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context(const char *const &name,
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std::function<void ()>,
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const flags & = (flags)0);
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context(std::function<void ()>,
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const flags & = (flags)0);
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context() = default;
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context(context &&) = default;
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context(const context &) = delete;
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context &operator=(context &&) = default;
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context &operator=(const context &) = delete;
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~context() noexcept;
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friend void swap(context &a, context &b) noexcept;
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};
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inline void
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swap(context &a, context &b)
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noexcept
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{
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std::swap(a.c, b.c);
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}
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} // namespace ctx
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} // namespace ircd
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