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"
15 using namespace lldb_private;
19 Error fileLock(int fd, int cmd, int lock_type, const uint64_t start,
23 fl.l_type = lock_type;
24 fl.l_whence = SEEK_SET;
27 fl.l_pid = ::getpid();
30 if (::fcntl(fd, cmd, &fl) == -1)
31 error.SetErrorToErrno();
38 LockFilePosix::LockFilePosix(int fd) : LockFileBase(fd) {}
40 LockFilePosix::~LockFilePosix() { Unlock(); }
42 Error LockFilePosix::DoWriteLock(const uint64_t start, const uint64_t len) {
43 return fileLock(m_fd, F_SETLKW, F_WRLCK, start, len);
46 Error LockFilePosix::DoTryWriteLock(const uint64_t start, const uint64_t len) {
47 return fileLock(m_fd, F_SETLK, F_WRLCK, start, len);
50 Error LockFilePosix::DoReadLock(const uint64_t start, const uint64_t len) {
51 return fileLock(m_fd, F_SETLKW, F_RDLCK, start, len);
54 Error LockFilePosix::DoTryReadLock(const uint64_t start, const uint64_t len) {
55 return fileLock(m_fd, F_SETLK, F_RDLCK, start, len);
58 Error LockFilePosix::DoUnlock() {
59 return fileLock(m_fd, F_SETLK, F_UNLCK, m_start, m_len);