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82 lines
2.3 KiB
82 lines
2.3 KiB
4 months ago
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//===-- LockFileBase.cpp --------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/LockFileBase.h"
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using namespace lldb;
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using namespace lldb_private;
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namespace {
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Status AlreadyLocked() { return Status("Already locked"); }
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Status NotLocked() { return Status("Not locked"); }
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}
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LockFileBase::LockFileBase(int fd)
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: m_fd(fd), m_locked(false), m_start(0), m_len(0) {}
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bool LockFileBase::IsLocked() const { return m_locked; }
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Status LockFileBase::WriteLock(const uint64_t start, const uint64_t len) {
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return DoLock([&](const uint64_t start,
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const uint64_t len) { return DoWriteLock(start, len); },
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start, len);
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}
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Status LockFileBase::TryWriteLock(const uint64_t start, const uint64_t len) {
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return DoLock([&](const uint64_t start,
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const uint64_t len) { return DoTryWriteLock(start, len); },
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start, len);
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}
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Status LockFileBase::ReadLock(const uint64_t start, const uint64_t len) {
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return DoLock([&](const uint64_t start,
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const uint64_t len) { return DoReadLock(start, len); },
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start, len);
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}
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Status LockFileBase::TryReadLock(const uint64_t start, const uint64_t len) {
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return DoLock([&](const uint64_t start,
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const uint64_t len) { return DoTryReadLock(start, len); },
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start, len);
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}
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Status LockFileBase::Unlock() {
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if (!IsLocked())
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return NotLocked();
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const auto error = DoUnlock();
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if (error.Success()) {
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m_locked = false;
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m_start = 0;
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m_len = 0;
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}
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return error;
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}
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bool LockFileBase::IsValidFile() const { return m_fd != -1; }
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Status LockFileBase::DoLock(const Locker &locker, const uint64_t start,
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const uint64_t len) {
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if (!IsValidFile())
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return Status("File is invalid");
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if (IsLocked())
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return AlreadyLocked();
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const auto error = locker(start, len);
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if (error.Success()) {
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m_locked = true;
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m_start = start;
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m_len = len;
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}
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return error;
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}
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