Method try_lock

lib_acl_cpp/src/stream/fstream.cpp:233–252

}

bool fstream::try_lock(bool exclude /* = true */)
{
	ACL_FILE_HANDLE fd = file_handle();
	if (fd == ACL_FILE_INVALID) {
		logger_error("invalid file handle");
#ifndef ACL_WINDOWS
		errno = EBADF;
#endif
		return false;
	}

#ifdef	ACL_HAS_FLOCK_LOCK
	return acl_myflock(fd, ACL_FLOCK_STYLE_FLOCK,
		exclude ?  (LOCK_EX | LOCK_NB) : (LOCK_SH | LOCK_NB)) == 0;
#else
	return acl_myflock(fd, ACL_FLOCK_STYLE_FCNTL,
		exclude ? (ACL_FLOCK_OP_NOWAIT | ACL_FLOCK_OP_EXCLUSIVE)
			: (ACL_FLOCK_OP_NOWAIT | ACL_FLOCK_OP_SHARED)) == 0;
#endif
}

bool fstream::unlock()
{