C++ gettid() was not declared in this scope

Question

A simple program is: I would like to get the thread ID of both of the threads using this gettid function. I do not want to do the sysCall directly. I want to use this funct

Answer 1

Additional to the solution provided by Glenn Maynard it might be appropriate to check the glibc version and only if it is lower than 2.30 define the suggested macro for gettid().

#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 30
#include 
#define gettid() syscall(SYS_gettid)
#endif