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https://github.com/Telecominfraproject/wlan-cloud-lib-poco.git
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4efaa99fff
* Logger & Channel classes now using AutoPtr<Channel> instead of Channel* (API improvement) * fix CachingChannel * more fixes * Configuration: remove raw pointers from interfaces #2077 * Add WeakPtr to Foundation #2246 * Add WeakPtr to Foundation #2246 (buildsystems files) * Add WeakPtr to Foundation #2246 (x64 VS project files) * backtrace and Event fixes * add ordered map * add ordered set * add sanitize makefiles * update RefPtr doc * fix AtomicCounter includes * add ordered containers tests * fix xml test compile error * remove operator bool rom smart pointers * Poco::strToInt<> fails for values right above the type's boundary / limit #2250 * add g++ -ftrapv config * remove Version.h includes (now included from Config.h) * comment out offending SQLite test (TODO) * add AtomicFlag and SpinlockMutex * remove RefCountedObject include from RefPtr and WeakRefPtr mutex template param * add WeakRef SpinLockMutex threading test * WeakRefPtr, backtrace, NDC, refcount DC fixes * SQL fixes * update RCO documentation * XML/DOM: Remove raw pointers from public interfaces #2075 * few fixes * PocoDoc - make logger non-static reference member * remove path char array initialization * Fix failing unit test, adding d in debug mode for TestApp and TestLibrary * fix application config pointer * fix some crypto warnings * fix Process tests and consolidate TestApp name building * define PathImpl::selfImpl for WinCE * restore WinCE test app name extension * attempt to passify 32 bit clang * fix failing Active* tests * Add POCO_OS_ANDROID support for Path::self() * Add build dependencies between Foundation-testrunner and TestApp, TestLibrary in cmake build * Remove to set LD_LIBRARY_PATH on foundation test * revert to develop XML * fix VS150 env not found (hardcode it) * undef min/max
118 lines
2.2 KiB
C++
118 lines
2.2 KiB
C++
//
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// AtomicFlag.h
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//
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// Library: Foundation
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// Package: Core
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// Module: AtomicFlag
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//
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// Definition of the AtomicFlag class.
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//
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// Copyright (c) 2009, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_AtomicFlag_INCLUDED
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#define Foundation_AtomicFlag_INCLUDED
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#include "Poco/Foundation.h"
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#include <atomic>
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namespace Poco {
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class AtomicFlag
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/// This class implements an atomic boolean flag by wrapping
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/// the std::atomic_flag. It is guaranteed to be thread-safe
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/// and lock-free.
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///
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/// Only default-construction is allowed, objects of this
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/// class are not copyable, assignable or movable.
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///
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/// Note that this class is not a replacement for (atomic)
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/// bool type because its value can not be read without also
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/// being set to true. However, after being set (either
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/// explicitly, through the set() call or implicitly, via
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/// operator bool()), it can be reset and reused.
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///
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/// The class is useful in scenarios such as busy-wait or
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/// one-off code blocks, e.g.:
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///
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/// class MyClass
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/// {
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/// public:
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/// void myFunc()
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/// {
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/// if (!_beenHere) doOnce();
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/// doMany();
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/// }
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///
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/// void doOnce() { /* executed once */ }
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///
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/// void doMany() { /* executed multiple times */ }
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///
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/// private:
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/// AtomicFlag _beenHere;
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/// }
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///
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/// MyClass myClass;
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/// int i = 0;
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/// while (++i < 10) myClass.myFunc();
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{
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public:
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AtomicFlag() {}
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~AtomicFlag() {}
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bool set();
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/// Sets the flag to true and returns previously
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/// held value.
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void reset();
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/// Resets the flag to false.
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operator bool ();
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/// Sets the flag to true and returns previously
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/// held value.
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private:
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AtomicFlag(const AtomicFlag&) = delete;
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AtomicFlag& operator = (const AtomicFlag&) = delete;
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AtomicFlag(AtomicFlag&&) = delete;
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AtomicFlag& operator = (AtomicFlag&&) = delete;
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std::atomic_flag _flag = ATOMIC_FLAG_INIT;
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};
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//
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// inlines
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//
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inline bool AtomicFlag::set()
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{
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return _flag.test_and_set(std::memory_order_acquire);
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}
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inline void AtomicFlag::reset()
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{
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_flag.clear(std::memory_order_release);
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}
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inline AtomicFlag::operator bool ()
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{
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return set();
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}
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} // namespace Poco
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#endif // Foundation_AtomicFlag_INCLUDED
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