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;
20 Error fileLock (int fd, int cmd, int lock_type, const uint64_t start, const uint64_t len)
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)
44 LockFilePosix::~LockFilePosix ()
50 LockFilePosix::DoWriteLock (const uint64_t start, const uint64_t len)
52 return fileLock (m_fd, F_SETLKW, F_WRLCK, start, len);
56 LockFilePosix::DoTryWriteLock (const uint64_t start, const uint64_t len)
58 return fileLock (m_fd, F_SETLK, F_WRLCK, start, len);
62 LockFilePosix::DoReadLock (const uint64_t start, const uint64_t len)
64 return fileLock (m_fd, F_SETLKW, F_RDLCK, start, len);
68 LockFilePosix::DoTryReadLock (const uint64_t start, const uint64_t len)
70 return fileLock (m_fd, F_SETLK, F_RDLCK, start, len);
74 LockFilePosix::DoUnlock ()
76 return fileLock (m_fd, F_SETLK, F_UNLCK, m_start, m_len);