llvm::cas::ondisk Namespace Reference

Functions
std::error_code	lockFileThreadSafe (int FD, llvm::sys::fs::LockKind Kind)
	Thread-safe alternative to sys::fs::lockFile.
std::error_code	unlockFileThreadSafe (int FD)
	Thread-safe alternative to sys::fs::unlockFile.
std::error_code	tryLockFileThreadSafe (int FD, std::chrono::milliseconds Timeout=std::chrono::milliseconds(0), llvm::sys::fs::LockKind Kind=llvm::sys::fs::LockKind::Exclusive)
	Thread-safe alternative to sys::fs::tryLockFile.
Expected< size_t >	preallocateFileTail (int FD, size_t CurrentSize, size_t NewSize)
	Allocate space for the file FD on disk, if the filesystem supports it.

Function Documentation

lockFileThreadSafe()

std::error_code llvm::cas::ondisk::lockFileThreadSafe	(	int	FD,
		llvm::sys::fs::LockKind	Kind )

Thread-safe alternative to sys::fs::lockFile.

This does not support all the platforms that sys::fs::lockFile does, so keep it in the CAS library for now.

Definition at line 30 of file OnDiskCommon.cpp.

References llvm::sys::fs::Exclusive, llvm::sys::fs::lockFile(), and llvm::make_error_code().

preallocateFileTail()

Expected< size_t > llvm::cas::ondisk::preallocateFileTail	(	int	FD,
		size_t	CurrentSize,
		size_t	NewSize )

Allocate space for the file FD on disk, if the filesystem supports it.

On filesystems that support this operation, this ensures errors such as std::errc::no_space_on_device are detected before we write data.

Returns

the new size of the file, or an Error.

Definition at line 84 of file OnDiskCommon.cpp.

References assert(), llvm::createStringError(), and llvm::errnoAsErrorCode().

Referenced by llvm::cas::MappedFileRegionArena::allocateOffset().

tryLockFileThreadSafe()

std::error_code llvm::cas::ondisk::tryLockFileThreadSafe	(	int	FD,
		std::chrono::milliseconds	Timeout = std::chrono::milliseconds(0),
		llvm::sys::fs::LockKind	Kind = llvm::sys::fs::LockKind::Exclusive )

Thread-safe alternative to sys::fs::tryLockFile.

This does not support all the platforms that sys::fs::lockFile does, so keep it in the CAS library for now.

Definition at line 58 of file OnDiskCommon.cpp.

References llvm::sys::fs::Exclusive, llvm::make_error_code(), llvm::Timeout, and llvm::sys::fs::tryLockFile().

unlockFileThreadSafe()

std::error_code llvm::cas::ondisk::unlockFileThreadSafe

(

int

FD

)

Thread-safe alternative to sys::fs::unlockFile.

This does not support all the platforms that sys::fs::lockFile does, so keep it in the CAS library for now.

Definition at line 44 of file OnDiskCommon.cpp.

References llvm::make_error_code(), and llvm::sys::fs::unlockFile().