68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Some helper functions for mallctl.
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#pragma once
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#include <folly/Likely.h>
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#include <folly/memory/Malloc.h>
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#include <stdexcept>
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namespace folly {
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namespace detail {
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[[noreturn]] void handleMallctlError(const char* cmd, int err);
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template <typename T>
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void mallctlHelper(const char* cmd, T* out, T* in) {
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if (UNLIKELY(!usingJEMalloc())) {
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throw std::logic_error("Calling mallctl when not using jemalloc.");
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}
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size_t outLen = sizeof(T);
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int err = mallctl(cmd, out, out ? &outLen : nullptr, in, in ? sizeof(T) : 0);
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if (UNLIKELY(err != 0)) {
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handleMallctlError(cmd, err);
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}
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}
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} // namespace detail
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template <typename T>
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void mallctlRead(const char* cmd, T* out) {
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detail::mallctlHelper(cmd, out, static_cast<T*>(nullptr));
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}
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template <typename T>
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void mallctlWrite(const char* cmd, T in) {
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detail::mallctlHelper(cmd, static_cast<T*>(nullptr), &in);
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}
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template <typename T>
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void mallctlReadWrite(const char* cmd, T* out, T in) {
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detail::mallctlHelper(cmd, out, &in);
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}
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inline void mallctlCall(const char* cmd) {
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// Use <unsigned> rather than <void> to avoid sizeof(void).
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mallctlRead<unsigned>(cmd, nullptr);
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}
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} // namespace folly
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