v29.4-roots.1 · Commit 2: [PATCH 02/13] runtime: preserve shared operator controls
src/util/ioprio.cpp
Before: /dev/null · After: src/util/ioprio.cpp
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src/util/ioprio.cpp
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// Copyright (c) 2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <bitcoin-build-config.h> // IWYU pragma: keep
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#include <util/ioprio.h>
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#if HAVE_IOPRIO_SYSCALL
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <unistd.h>
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#include <sys/syscall.h>
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#ifndef IOPRIO_WHO_PROCESS
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#define IOPRIO_WHO_PROCESS 1
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#endif
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#ifndef IOPRIO_CLASS_IDLE
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#define IOPRIO_CLASS_IDLE 3
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#endif
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#ifndef IOPRIO_CLASS_SHIFT
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#define IOPRIO_CLASS_SHIFT 13
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#endif
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int ioprio_get() {
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return syscall(SYS_ioprio_get, IOPRIO_WHO_PROCESS, 0);
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}
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int ioprio_set(const int ioprio) {
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return syscall(SYS_ioprio_set, IOPRIO_WHO_PROCESS, 0, ioprio);
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}
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int ioprio_set_idle() {
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return ioprio_set(7 | (IOPRIO_CLASS_IDLE << IOPRIO_CLASS_SHIFT));
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}
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#elif HAVE_IOPOLICY
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#include <sys/resource.h>
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int ioprio_get() {
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return getiopolicy_np(IOPOL_TYPE_DISK, IOPOL_SCOPE_THREAD);
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}
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int ioprio_set(const int ioprio) {
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return setiopolicy_np(IOPOL_TYPE_DISK, IOPOL_SCOPE_THREAD, ioprio);
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}
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int ioprio_set_idle() {
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return ioprio_set(IOPOL_UTILITY);
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}
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#endif
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#if HAVE_WINDOWS_IOPRIO
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#include <windows.h>
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#include <io.h>
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#include <cstddef>
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#include <cstdint>
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#include <cstdio>
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bool ioprio_set_file_idle(FILE * const F) {
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FILE_IO_PRIORITY_HINT_INFO priorityHint = {
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.PriorityHint = IoPriorityHintLow,
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};
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intptr_t osfhandle = _get_osfhandle(_fileno(F));
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if (osfhandle == (intptr_t)INVALID_HANDLE_VALUE || osfhandle == (intptr_t)-2) {
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return false;
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}
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HANDLE hFile = (HANDLE)osfhandle;
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return SetFileInformationByHandle(hFile, FileIoPriorityHintInfo, &priorityHint, sizeof(priorityHint));
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}
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#endif
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