[ace-users] ACE_FILE_LOCK using handle owned by ACE_FILE_LOCK
Sukumar.Gudugunta at philips.com
Tue Feb 2 13:58:30 CST 2016
We are using ACE_FILE_LOCK object to lock the file (read/write). Here am using set handle (ACE_HANDLE) method to set the handle for the lock.
Can anyone let me know why we need to set this handle?
Once we acquire the lock can I use the same handle to truncate and rewrite the whole file? Does it cause any dead locks?
int err= 0;
err = ACE_OS::ftruncate(m_lock.get_handle(),0);
//Here we have opened the two handles(Open method) above. using m_handle we can't overwrite first byts of the file
//Since the iFileLocK mechanism locks the first byte of the file.hence using the handle owned by m_lock to overwrite the entire file
ACE_UINT64 qwPosition = 0;
throw OSError("FileSeek failed",m_path.c_str(),THISFILE,__LINE__);
throw OSError("Write failed",m_path.c_str(),THISFILE,__LINE__);
As per my understanding ACE_FILE_LOCK locks the offset of first byte in the file. Please let me know if this is correct?
Thanks in advance
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