1 files changed, 81 insertions, 0 deletions

diff --git a/contrib/llvm-project/lldb/source/Host/common/LockFileBase.cpp b/contrib/llvm-project/lldb/source/Host/common/LockFileBase.cpp
new file mode 100644
index 000000000000..744b1eaabb4e
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Host/common/LockFileBase.cpp
@@ -0,0 +1,81 @@
+//===-- LockFileBase.cpp ----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/LockFileBase.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace {
+
+Status AlreadyLocked() { return Status("Already locked"); }
+
+Status NotLocked() { return Status("Not locked"); }
+}
+
+LockFileBase::LockFileBase(int fd)
+    : m_fd(fd), m_locked(false), m_start(0), m_len(0) {}
+
+bool LockFileBase::IsLocked() const { return m_locked; }
+
+Status LockFileBase::WriteLock(const uint64_t start, const uint64_t len) {
+  return DoLock([&](const uint64_t start,
+                    const uint64_t len) { return DoWriteLock(start, len); },
+                start, len);
+}
+
+Status LockFileBase::TryWriteLock(const uint64_t start, const uint64_t len) {
+  return DoLock([&](const uint64_t start,
+                    const uint64_t len) { return DoTryWriteLock(start, len); },
+                start, len);
+}
+
+Status LockFileBase::ReadLock(const uint64_t start, const uint64_t len) {
+  return DoLock([&](const uint64_t start,
+                    const uint64_t len) { return DoReadLock(start, len); },
+                start, len);
+}
+
+Status LockFileBase::TryReadLock(const uint64_t start, const uint64_t len) {
+  return DoLock([&](const uint64_t start,
+                    const uint64_t len) { return DoTryReadLock(start, len); },
+                start, len);
+}
+
+Status LockFileBase::Unlock() {
+  if (!IsLocked())
+    return NotLocked();
+
+  const auto error = DoUnlock();
+  if (error.Success()) {
+    m_locked = false;
+    m_start = 0;
+    m_len = 0;
+  }
+  return error;
+}
+
+bool LockFileBase::IsValidFile() const { return m_fd != -1; }
+
+Status LockFileBase::DoLock(const Locker &locker, const uint64_t start,
+                            const uint64_t len) {
+  if (!IsValidFile())
+    return Status("File is invalid");
+
+  if (IsLocked())
+    return AlreadyLocked();
+
+  const auto error = locker(start, len);
+  if (error.Success()) {
+    m_locked = true;
+    m_start = start;
+    m_len = len;
+  }
+
+  return error;
+}