Folks, I can't find the re-entrant version of syslog() for Linux...is there one? And if no, what do you? The obvious answer is to move logging facility into separate thread and serialise access to syslog...
According to the POSIX specification, the syslog function is already thread-safe, and so implemented in Linux. So syslog_r is unnecessary - use syslog if you need a reentrant logger function.
来源：https://stackoverflow.com/questions/1163194/syslog-r-for-linux