forked from OSchip/llvm-project
94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
//===-- LockFileWindows.cpp -------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/windows/LockFileWindows.h"
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#include <io.h>
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using namespace lldb;
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using namespace lldb_private;
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namespace
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{
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Error fileLock (HANDLE file_handle, DWORD flags, const uint64_t start, const uint64_t len)
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{
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if (start != 0)
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return Error ("Non-zero start lock regions are not supported");
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OVERLAPPED overlapped = {0};
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if (!::LockFileEx (file_handle, flags, 0, len, 0, &overlapped) && ::GetLastError () != ERROR_IO_PENDING)
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return Error (::GetLastError (), eErrorTypeWin32);
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DWORD bytes;
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if (!::GetOverlappedResult (file_handle, &overlapped, &bytes, TRUE))
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return Error (::GetLastError (), eErrorTypeWin32);
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return Error ();
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}
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} // namespace
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LockFileWindows::LockFileWindows (int fd)
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: LockFileBase (fd),
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m_file (reinterpret_cast<HANDLE> (_get_osfhandle (fd)))
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{
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}
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LockFileWindows::~LockFileWindows ()
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{
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Unlock ();
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}
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bool
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LockFileWindows::IsValidFile () const
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{
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return LockFileBase::IsValidFile() && m_file != INVALID_HANDLE_VALUE;
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}
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Error
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LockFileWindows::DoWriteLock (const uint64_t start, const uint64_t len)
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{
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return fileLock (m_file, LOCKFILE_EXCLUSIVE_LOCK, start, len);
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}
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Error
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LockFileWindows::DoTryWriteLock (const uint64_t start, const uint64_t len)
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{
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return fileLock (m_file, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, start, len);
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}
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Error
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LockFileWindows::DoReadLock (const uint64_t start, const uint64_t len)
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{
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return fileLock (m_file, 0, start, len);
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}
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Error
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LockFileWindows::DoTryReadLock (const uint64_t start, const uint64_t len)
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{
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return fileLock (m_file, LOCKFILE_FAIL_IMMEDIATELY, start, len);
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}
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Error
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LockFileWindows::DoUnlock ()
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{
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OVERLAPPED overlapped = {0};
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if (!::UnlockFileEx (m_file, 0, m_len, 0, &overlapped) && ::GetLastError () != ERROR_IO_PENDING)
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return Error (::GetLastError (), eErrorTypeWin32);
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DWORD bytes;
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if (!::GetOverlappedResult (m_file, &overlapped, &bytes, TRUE))
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return Error (::GetLastError (), eErrorTypeWin32);
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return Error ();
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}
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