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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
//===-- LockFileBase.cpp ----------------------------------------*- C++ -*-===//
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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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