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76e25f36a3
The generic implementation is based on the lock pool. A list of condition variables (or waiting futexes) is added per lock. Basically, the lock pool serves as a global hash table, where each lock represents a bucket and each wait state is an element. Every wait operation allocates a wait state keyed on the pointer to the atomic object. Notify operations look up the wait state by the atomic pointer and notify the condition variable/futex. The corresponding lock needs to be acquired to protect the wait state list during all wait/notify operations. Backends not involving the lock pool are going to be added later. The implementation of wait operation extends the C++20 definition in that it returns the newly loaded value instead of void. This allows the caller to avoid loading the value himself. The waiting/notifying operations are not address-free. Address-free variants will be added later. Added tests for the new operations and refactored existing tests for atomic operations. Added docs for the new operations.
39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
// Copyright (c) 2020 Andrey Semashev
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/atomic.hpp>
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#include <boost/config.hpp>
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#include <boost/cstdint.hpp>
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#include "wait_test_helpers.hpp"
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int main(int, char *[])
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{
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test_wait_notify_api< atomic_ref_wrapper, boost::uint8_t >(1, 2, 3);
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test_wait_notify_api< atomic_ref_wrapper, boost::uint16_t >(1, 2, 3);
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test_wait_notify_api< atomic_ref_wrapper, boost::uint32_t >(1, 2, 3);
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test_wait_notify_api< atomic_ref_wrapper, boost::uint64_t >(1, 2, 3);
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#if defined(BOOST_HAS_INT128) && !defined(BOOST_ATOMIC_TESTS_NO_INT128)
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test_wait_notify_api< atomic_ref_wrapper, boost::uint128_type >(1, 2, 3);
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#endif
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{
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struct_3_bytes s1 = {{ 1 }};
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struct_3_bytes s2 = {{ 2 }};
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struct_3_bytes s3 = {{ 3 }};
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test_wait_notify_api< atomic_ref_wrapper, struct_3_bytes >(s1, s2, s3);
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}
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{
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large_struct s1 = {{ 1 }};
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large_struct s2 = {{ 2 }};
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large_struct s3 = {{ 3 }};
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test_wait_notify_api< atomic_ref_wrapper, large_struct >(s1, s2, s3);
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}
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return boost::report_errors();
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}
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