[Proj] libproj4 thread safety
gerald.evenden at verizon.net
Sun Apr 24 16:52:29 EDT 2005
Oops! Found another little thread problem. pj_strerrno.c calls the
routine strerror for positive error numbers and it is not thread-safe.
Linux info suggests strerror_r which is thread-safe. This may only be a
Linux procedure and pose a transportability problem.
For negative arguments, pj_strerrno returns pointer to const strings
so that aspect should be thread-safe although I should tighten up the
But to accommodate strerror pj_strerrno will have to look like:
int pj_strerrno(int err, char * buff, int length);
where err is the errno code, buff is a 'length' long and the procedure
returns 1 on an invalid errno and 0 for successful call.
Found this while rewriting the manual page on errors and while reading
H&S I detected funky description of what strerror was doing and
checking info which gave the bad news. At the moment I do not
why strerror just doesn't return a pointer to a const string. Fie!
Jerry and the low riders: Daisy Mae and Joshua.
"The whole religious complexion of the modern world is due to the
absence from Jerusalem of a lunatic asylum." Havelock Ellis, 1914
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