OpenEuphoria

Re: How to wait for file closing?

• Posted by ChrisB (moderator) Dec 11, 2012
• 1661 views

Hi

That looks a little tangled. Try (pseudocode)

c program

file *fp, *fl 
 
//get data from sensors 
 
fl = fopen("lock_file", "w") 
puts(fl, "~") 
fclose(fl) 
 
fp = fopen("datafile", "w") 
//put all your data in there 
fclose(fp) 
 
unlink("lock_file") 
 

then in the eu program

 
if file_exists("lock_file") then 
    --can't do anything, come back later 
else 
    -- get your data 
    data = read_lines(datafile) 
end if 
 

Note, unless you've got a huge data file to write from the C program, then the chances of the eu program encountering the lock file are low. The other danger of course is that the C program starts to write a new datafile before the eu program has finished reading it - you could always write another don't write anything lock file from the eu program, to be checked by the C program before it starts writing.

Chris