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Code Issues Releases Wiki Activity

ircd::ctx: Split sleep()/wait() suites into headers.

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This commit is contained in:
Jason Volk 2020-02-28 09:11:06 -08:00
parent 92b7ae5c17
commit a6131d1268
4 changed files with 141 additions and 96 deletions
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2
include/ircd/ctx/ctx.h
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@ -79,6 +79,8 @@ namespace ircd::ctx
#include "prof.h"
#include "this_ctx.h"
#include "wait.h"
#include "sleep.h"
#include "stack_usage_assertion.h"
#include "slice_usage_warning.h"
#include "syscall_usage_warning.h"

39
include/ircd/ctx/sleep.h Normal file
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@ -0,0 +1,39 @@
// The Construct
//
// Copyright (C) The Construct Developers, Authors & Contributors
// Copyright (C) 2016-2020 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_SLEEP_H
namespace ircd::ctx { inline namespace this_ctx
{
// Ignores notes. Throws if interrupted.
void sleep_until(const system_point &tp);
template<class duration> void sleep(const duration &);
void sleep(const int &secs);
}}
/// This overload matches ::sleep() and acts as a drop-in for ircd contexts.
/// interruption point.
inline void
ircd::ctx::this_ctx::sleep(const int &secs)
{
sleep(seconds(secs));
}
/// Yield the context for a period of time and ignore notifications. sleep()
/// is like wait() but it only returns after the timeout and not because of a
/// note.
/// interruption point.
template<class duration>
void
ircd::ctx::this_ctx::sleep(const duration &d)
{
sleep_until(system_clock::now() + d);
}

97
include/ircd/ctx/this_ctx.h
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@ -12,33 +12,15 @@
#define HAVE_IRCD_CTX_THIS_CTX_H
/// Interface to the currently running context
namespace ircd::ctx {
inline namespace this_ctx
namespace ircd::ctx { inline namespace this_ctx
{
struct ctx &cur() noexcept; ///< Assumptional reference to *current
const uint64_t &id() noexcept; // Unique ID for cur ctx
string_view name() noexcept; // Optional label for cur ctx
ulong cycles() noexcept; // misc profiling related
bool interruption_requested() noexcept; // interruption(cur())
void interruption_point(); // throws if interruption_requested()
void wait(); // Returns when context is woken up.
void yield(); // Allow other contexts to run before returning.
// Return remaining time if notified; or <= 0 if not, and timeout thrown on throw overloads
microseconds wait(const microseconds &, const std::nothrow_t &);
template<class E, class duration> nothrow_overload<E, duration> wait(const duration &);
template<class E = timeout, class duration> throw_overload<E, duration> wait(const duration &);
// Returns false if notified; true if time point reached, timeout thrown on throw_overloads
bool wait_until(const system_point &tp, const std::nothrow_t &);
template<class E> nothrow_overload<E, bool> wait_until(const system_point &tp);
template<class E = timeout> throw_overload<E> wait_until(const system_point &tp);
// Ignores notes. Throws if interrupted.
void sleep_until(const system_point &tp);
template<class duration> void sleep(const duration &);
void sleep(const int &secs);
}}
namespace ircd::ctx
@ -52,83 +34,6 @@ namespace ircd
namespace this_ctx = ctx::this_ctx;
}
/// This overload matches ::sleep() and acts as a drop-in for ircd contexts.
/// interruption point.
inline void
ircd::ctx::this_ctx::sleep(const int &secs)
{
sleep(seconds(secs));
}
/// Yield the context for a period of time and ignore notifications. sleep()
/// is like wait() but it only returns after the timeout and not because of a
/// note.
/// interruption point.
template<class duration>
void
ircd::ctx::this_ctx::sleep(const duration &d)
{
sleep_until(system_clock::now() + d);
}
/// Wait for a notification until a point in time. If there is a notification
/// then context continues normally. If there's never a notification then an
/// exception (= timeout) is thrown.
/// interruption point.
template<class E>
ircd::throw_overload<E>
ircd::ctx::this_ctx::wait_until(const system_point &tp)
{
if(wait_until<std::nothrow_t>(tp))
throw E{};
}
/// Wait for a notification until a point in time. If there is a notification
/// then returns true. If there's never a notification then returns false.
/// interruption point. this is not noexcept.
template<class E>
ircd::nothrow_overload<E, bool>
ircd::ctx::this_ctx::wait_until(const system_point &tp)
{
return wait_until(tp, std::nothrow);
}
/// Wait for a notification for at most some amount of time. If the duration is
/// reached without a notification then E (= timeout) is thrown. Otherwise,
/// returns the time remaining on the duration.
/// interruption point
template<class E,
class duration>
ircd::throw_overload<E, duration>
ircd::ctx::this_ctx::wait(const duration &d)
{
const auto ret
{
wait<std::nothrow_t>(d)
};
return ret <= duration(0)?
throw E{}:
ret;
}
/// Wait for a notification for some amount of time. This function returns
/// when a context is notified. It always returns the duration remaining which
/// will be <= 0 to indicate a timeout without notification.
/// interruption point. this is not noexcept.
template<class E,
class duration>
ircd::nothrow_overload<E, duration>
ircd::ctx::this_ctx::wait(const duration &d)
{
const auto ret
{
wait(duration_cast<microseconds>(d), std::nothrow)
};
return duration_cast<duration>(ret);
}
/// View the name of the currently running context, or "*" if no context is
/// currently running.
inline ircd::string_view

99
include/ircd/ctx/wait.h Normal file
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@ -0,0 +1,99 @@
// The Construct
//
// Copyright (C) The Construct Developers, Authors & Contributors
// Copyright (C) 2016-2020 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_WAIT_H
namespace ircd::ctx { inline namespace this_ctx
{
// Returns when context is woken up.
void wait();
// Return remaining time if notified; or <= 0 if not, and timeout thrown on throw overloads
microseconds wait(const microseconds &, const std::nothrow_t &);
template<class E,
class duration>
nothrow_overload<E, duration> wait(const duration &);
// timeout thrown if time point reached
template<class E = timeout,
class duration>
throw_overload<E, duration> wait(const duration &);
// Returns false if notified; true if time point reached
bool wait_until(const system_point &tp, const std::nothrow_t &);
// Returns false if notified; true if time point reached
template<class E>
nothrow_overload<E, bool> wait_until(const system_point &tp);
// timeout thrown if time point reached
template<class E = timeout>
throw_overload<E> wait_until(const system_point &tp);
}}
/// Wait for a notification until a point in time. If there is a notification
/// then context continues normally. If there's never a notification then an
/// exception (= timeout) is thrown.
/// interruption point.
template<class E>
ircd::throw_overload<E>
ircd::ctx::this_ctx::wait_until(const system_point &tp)
{
if(wait_until<std::nothrow_t>(tp))
throw E{};
}
/// Wait for a notification until a point in time. If there is a notification
/// then returns true. If there's never a notification then returns false.
/// interruption point. this is not noexcept.
template<class E>
ircd::nothrow_overload<E, bool>
ircd::ctx::this_ctx::wait_until(const system_point &tp)
{
return wait_until(tp, std::nothrow);
}
/// Wait for a notification for at most some amount of time. If the duration is
/// reached without a notification then E (= timeout) is thrown. Otherwise,
/// returns the time remaining on the duration.
/// interruption point
template<class E,
class duration>
ircd::throw_overload<E, duration>
ircd::ctx::this_ctx::wait(const duration &d)
{
const auto ret
{
wait<std::nothrow_t>(d)
};
return ret <= duration(0)?
throw E{}:
ret;
}
/// Wait for a notification for some amount of time. This function returns
/// when a context is notified. It always returns the duration remaining which
/// will be <= 0 to indicate a timeout without notification.
/// interruption point. this is not noexcept.
template<class E,
class duration>
ircd::nothrow_overload<E, duration>
ircd::ctx::this_ctx::wait(const duration &d)
{
const auto ret
{
wait(duration_cast<microseconds>(d), std::nothrow)
};
return duration_cast<duration>(ret);
}