mirror of
https://github.com/pocoproject/poco.git
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e5752a5c6d
* add RWLock implementation for file [posix] * add implementation FileStreamRWLock for windows replace FileStreamRWLock to the Process package * add files FileStreamRWLock* into makefile and vcproj * remove unnecessary file from makefile * use absolute path to the TesApp with ProcessRunner * fix vc*.proj * add new test files into vc.proj.filters * fix comments * fix spelling fo PR #4723 add atomic_bool _locked and check if FileStreamRWLock is locked on destruction for force unlock * add atomic header * File lock (#4740) * throw error on any errno not only on EDEADLK * fix function naming * fix windows build * fix windows build --------- Co-authored-by: Alexander B <ale.bychuk@gmail.com> Co-authored-by: bas524 <bas524@ya.ru>
116 lines
2.3 KiB
C++
116 lines
2.3 KiB
C++
//
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// FileStreamRWLock_POSIX.h
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//
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// Library: Foundation
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// Package: Processes
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// Module: FileStreamRWLock
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//
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// Definition of the FileStreamRWLockImpl class for POSIX FileStream.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_FileStreamRWLock_POSIX_INCLUDED
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#define Foundation_FileStreamRWLock_POSIX_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Exception.h"
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#include "Poco/FileStream.h"
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#include <fcntl.h>
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#include <cerrno>
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namespace Poco {
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class Foundation_API FileStreamRWLockImpl
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{
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protected:
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FileStreamRWLockImpl(const FileStream::NativeHandle &fd, Poco::UInt64 offset, Poco::UInt64 size);
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~FileStreamRWLockImpl();
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void readLockImpl();
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bool tryReadLockImpl();
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void writeLockImpl();
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bool tryWriteLockImpl();
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void unlockImpl();
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private:
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FileStream::NativeHandle _fd;
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struct flock _flock;
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int _lockMode;
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};
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//
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// inlines
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//
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inline void FileStreamRWLockImpl::readLockImpl()
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{
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_flock.l_type = F_RDLCK;
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_lockMode = F_SETLKW;
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int rc = fcntl(_fd, _lockMode, &_flock);
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if (rc == -1)
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throw SystemException("cannot lock reader lock", errno);
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}
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inline bool FileStreamRWLockImpl::tryReadLockImpl()
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{
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_flock.l_type = F_RDLCK;
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_lockMode = F_SETLK;
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int rc = fcntl(_fd, _lockMode, &_flock);
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if (rc == 0)
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return true;
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else if (errno == EAGAIN || errno == EACCES)
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return false;
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else
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throw SystemException("cannot lock try-reader lock", errno);
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}
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inline void FileStreamRWLockImpl::writeLockImpl()
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{
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_flock.l_type = F_WRLCK;
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_lockMode = F_SETLKW;
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int rc = fcntl(_fd, _lockMode, &_flock);
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if (rc == -1)
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throw SystemException("cannot lock writer lock", errno);
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}
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inline bool FileStreamRWLockImpl::tryWriteLockImpl()
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{
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_flock.l_type = F_WRLCK;
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_lockMode = F_SETLK;
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int rc = fcntl(_fd, _lockMode, &_flock);
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if (rc != -1)
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return true;
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else if (errno == EAGAIN || errno == EACCES)
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return false;
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else
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throw SystemException("cannot lock writer lock", errno);
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}
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inline void FileStreamRWLockImpl::unlockImpl()
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{
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_flock.l_type = F_UNLCK;
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_lockMode = F_SETLKW;
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int rc = fcntl(_fd, _lockMode, &_flock);
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if (rc == -1)
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throw SystemException("cannot unlock", errno);
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}
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} // namespace Poco
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#endif // Foundation_FileStreamRWLock_POSIX_INCLUDED
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