madcow:/home/public/test-tools/gdb # gdb64 tbug64
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This GDB was configured as "ppc64-suse-linux"...Using host libthread_db
library
"/lib64/tls/libthread_db.so.1".

(gdb) break main
Breakpoint 1 at 0x100007f8: file tbug.c, line 31.
(gdb) run
Starting program: /home/public/test-tools/gdb/tbug64
[Thread debugging using libthread_db enabled]
[New Thread 549757822848 (LWP 26734)]
[Switching to Thread 549757822848 (LWP 26734)]

Breakpoint 1, main (argc=1, argv=0x1fffffff2b8) at tbug.c:31
31        for (n = 0; n < N; ++n)
(gdb) cont
Continuing.
[New Thread 549762017472 (LWP 26737)]
tf(0): begin
[New Thread 549766211776 (LWP 26738)]
after create
tf(1): begin
tf(0): end
[Thread 549762017472 (LWP 26737) exited]
tf(1): end
[Thread 549766211776 (LWP 26738) exited]
after join

Program exited normally.
(gdb) clear main
Deleted breakpoint 1
(gdb) break tf
Breakpoint 2 at 0x1000074c: file tbug.c, line 15.
(gdb) run
Starting program: /home/public/test-tools/gdb/tbug64
[Thread debugging using libthread_db enabled]
[New Thread 549757822848 (LWP 26739)]
[New Thread 549762017472 (LWP 26740)]
[Switching to Thread 549762017472 (LWP 26740)]

Breakpoint 2, tf (arg=0x0) at tbug.c:15
15        int n = (int) (long int) arg;
(gdb) cont
Continuing.
[New Thread 549766211776 (LWP 26741)]
[Switching to Thread 549766211776 (LWP 26741)]

Breakpoint 2, tf (arg=0x1) at tbug.c:15
15        int n = (int) (long int) arg;
(gdb) cont
Continuing.
tf(1): begin
tf(0): begin
after create
tf(1): end
tf(0): end
[Thread 549762017472 (LWP 26740) exited]
[Thread 549766211776 (LWP 26741) exited]
after join

Program exited normally.
(gdb) quit