83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
//===-- LockFileBase.cpp ----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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Error AlreadyLocked() { return Error("Already locked"); }
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Error NotLocked() { return Error("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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Error 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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Error 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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Error 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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Error 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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Error 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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Error 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 Error("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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