Writer : http://www.ischo.net -- ischo // System Engineer

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Context of /usr/include/pthread.h  file

/* PTHREAD_THREADS_MAX has the same value as PTHREAD_THREADS_MAX in limits.h */
#ifdef PTHREAD_THREADS_MAX
#undef PTHREAD_THREADS_MAX
#endif
#ifndef PTHREAD_THREADS_MAX
#ifdef _LARGE_THREADS
#define PTHREAD_THREADS_MAX             32767
#else
#define PTHREAD_THREADS_MAX             512
#endif
#endif

it presents "PTHREAD_THREADS_MAX has the same value as PTHREAD_THREADS_MAX in limits.h"

but contents is remarked as "#", because it can be modified ulimit command after AIX version 6.1.

In older relase,

AIX 5.1 ~ 5.3 : default value 32767

and in AIX 6.1 environment, default value of  PTHREAD_THREADS_MAX is 32768.