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//===- OnDiskCommon.h -------------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CAS_ONDISKCOMMON_H
#define LLVM_LIB_CAS_ONDISKCOMMON_H
#include "llvm/Support/Error.h"
#include <chrono>
#include <optional>
namespace llvm::cas::ondisk {
/// Retrieves an overridden maximum mapping size for CAS files, if any,
/// speicified by LLVM_CAS_MAX_MAPPING_SIZE in the environment or set by
/// `setMaxMappingSize()`. If the value from environment is unreadable, returns
/// an error.
Expected<std::optional<uint64_t>> getOverriddenMaxMappingSize();
/// Set MaxMappingSize for ondisk CAS. This function is not thread-safe and
/// should be set before creaing any ondisk CAS and does not affect CAS already
/// created. Set value 0 to use default size.
void setMaxMappingSize(uint64_t Size);
/// Thread-safe alternative to \c sys::fs::lockFile. This does not support all
/// the platforms that \c sys::fs::lockFile does, so keep it in the CAS library
/// for now.
std::error_code lockFileThreadSafe(int FD, bool Exclusive = true);
/// Thread-safe alternative to \c sys::fs::unlockFile. This does not support all
/// the platforms that \c sys::fs::lockFile does, so keep it in the CAS library
/// for now.
std::error_code unlockFileThreadSafe(int FD);
/// Thread-safe alternative to \c sys::fs::tryLockFile. This does not support
/// all the platforms that \c sys::fs::lockFile does, so keep it in the CAS
/// library for now.
std::error_code tryLockFileThreadSafe(
int FD, std::chrono::milliseconds Timeout = std::chrono::milliseconds(0),
bool Exclusive = true);
} // namespace llvm::cas::ondisk
#endif // LLVM_LIB_CAS_ONDISKCOMMON_H
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