Hi, Now that we're using LWP in LinuxThreads, is there any particular reason not to enable PT_LWPINFO in <sys/ptrace.h> ? We currently have: #if 0 /* our threading libray is different */ #define PT_LWPINFO 13 /* Info about the LWP that stopped. */ #define PT_GETNUMLWPS 14 /* get total number of threads */ #define PT_GETLWPLIST 15 /* get thread list */ #endif -- Robert Millan