cheng/libpng
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[libpng16] Added information about configuring for multiprocessing to INSTALL.

Browse Source
This commit is contained in:
Glenn Randers-Pehrson 2014-03-16 19:31:09 -05:00
parent 2f5fb84cc4
commit 0464b436b6
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
INSTALL
View File

@ -395,6 +395,20 @@ pngusr.h a system builder may also define equivalent options in pngusr.dfa
(or, indeed, any file) and add that to the configuration by setting (or, indeed, any file) and add that to the configuration by setting
DFA_XTRA to the file name. The makefiles in contrib/pngminim illustrate DFA_XTRA to the file name. The makefiles in contrib/pngminim illustrate
how to do this, and a case where pngusr.h is still required. how to do this, and a case where pngusr.h is still required.
Configuring libpng for multiprocessing
Libpng uses setjmp()/longjmp() for error handling. Unfortunately setjmp()
is known to be not thread-safe on some platforms and we don't know of
any platform where it is guaranteed to be thread-safe. Therefore, if
your application is going to be using multiple threads, you should
configure libpng with PNG_NO_SETJMP in your pngusr.dfa file, with
-DPNG_NO_SETJMP on your compile line, or with
#undef PNG_SETJMP_SUPPORTED
in your pnglibconf.h or pngusr.h.
Other sources of information about libpng: Other sources of information about libpng:
Further information can be found in the README and libpng-manual.txt Further information can be found in the README and libpng-manual.txt