1 //===-- LockFileWindows.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/windows/LockFileWindows.h"
15 using namespace lldb_private;
20 Error fileLock (HANDLE file_handle, DWORD flags, const uint64_t start, const uint64_t len)
23 return Error ("Non-zero start lock regions are not supported");
25 OVERLAPPED overlapped = {0};
27 if (!::LockFileEx (file_handle, flags, 0, len, 0, &overlapped) && ::GetLastError () != ERROR_IO_PENDING)
28 return Error (::GetLastError (), eErrorTypeWin32);
31 if (!::GetOverlappedResult (file_handle, &overlapped, &bytes, TRUE))
32 return Error (::GetLastError (), eErrorTypeWin32);
39 LockFileWindows::LockFileWindows (int fd)
41 m_file (reinterpret_cast<HANDLE> (_get_osfhandle (fd)))
45 LockFileWindows::~LockFileWindows ()
51 LockFileWindows::IsValidFile () const
53 return LockFileBase::IsValidFile() && m_file != INVALID_HANDLE_VALUE;
57 LockFileWindows::DoWriteLock (const uint64_t start, const uint64_t len)
59 return fileLock (m_file, LOCKFILE_EXCLUSIVE_LOCK, start, len);
63 LockFileWindows::DoTryWriteLock (const uint64_t start, const uint64_t len)
65 return fileLock (m_file, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, start, len);
69 LockFileWindows::DoReadLock (const uint64_t start, const uint64_t len)
71 return fileLock (m_file, 0, start, len);
75 LockFileWindows::DoTryReadLock (const uint64_t start, const uint64_t len)
77 return fileLock (m_file, LOCKFILE_FAIL_IMMEDIATELY, start, len);
81 LockFileWindows::DoUnlock ()
83 OVERLAPPED overlapped = {0};
85 if (!::UnlockFileEx (m_file, 0, m_len, 0, &overlapped) && ::GetLastError () != ERROR_IO_PENDING)
86 return Error (::GetLastError (), eErrorTypeWin32);
89 if (!::GetOverlappedResult (m_file, &overlapped, &bytes, TRUE))
90 return Error (::GetLastError (), eErrorTypeWin32);