1 //===-- LockFilePosix.cpp ---------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "lldb/Host/posix/LockFilePosix.h"
16 using namespace lldb_private;
20 Status fileLock(int fd, int cmd, int lock_type, const uint64_t start,
24 fl.l_type = lock_type;
25 fl.l_whence = SEEK_SET;
28 fl.l_pid = ::getpid();
31 if (::fcntl(fd, cmd, &fl) == -1)
32 error.SetErrorToErrno();
39 LockFilePosix::LockFilePosix(int fd) : LockFileBase(fd) {}
41 LockFilePosix::~LockFilePosix() { Unlock(); }
43 Status LockFilePosix::DoWriteLock(const uint64_t start, const uint64_t len) {
44 return fileLock(m_fd, F_SETLKW, F_WRLCK, start, len);
47 Status LockFilePosix::DoTryWriteLock(const uint64_t start, const uint64_t len) {
48 return fileLock(m_fd, F_SETLK, F_WRLCK, start, len);
51 Status LockFilePosix::DoReadLock(const uint64_t start, const uint64_t len) {
52 return fileLock(m_fd, F_SETLKW, F_RDLCK, start, len);
55 Status LockFilePosix::DoTryReadLock(const uint64_t start, const uint64_t len) {
56 return fileLock(m_fd, F_SETLK, F_RDLCK, start, len);
59 Status LockFilePosix::DoUnlock() {
60 return fileLock(m_fd, F_SETLK, F_UNLCK, m_start, m_len);