zlog features about zlog HOT 3 CLOSED

1. At compile time, you can redefine macros in zlog.h, to make all the logging macros to be null. It will be zero cost.At run time, zlog its self is optimized by a bitmap operation:

   #define zlog_category_needless_level(a_category, lv) \
   !((a_category->level_bitmap[lv/8] >> (7 - lv % 8)) & 0x01)
   

   This is the only cost of a logging statement whose log level is disabled.

2.zlog api is thread safe, but not reentrant. But in real product code, you can use zlog api in signal handle function.
I think about output code stack when a process crashes, but found that just linux provide such api.

   int backtrace(void **buffer, int size);
   char **backtrace_symbols(void *const *buffer, int size);
   void backtrace_symbols_fd(void *const *buffer, int size, int fd);

from zlog.

Can I use zlog free of cost with or without modifications to it in my applications?

from zlog.

Sure you can, just obey the LGPL lience

from zlog.