From fd5d6a6294b0db3f2143d2735b78bffa284b4259 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Tue, 9 Nov 2004 21:52:49 +0000 Subject: [BZ #530] 2004-11-09 Roland McGrath [BZ #530] * sysdeps/pthread/createthread.c (do_clone): Increment __nptl_nthreads here, before calling clone. * pthread_create.c (start_thread): Don't do it here. --- nptl/pthread_create.c | 3 --- nptl/sysdeps/pthread/createthread.c | 12 ++++++++++++ 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 7293f4c71c..82a3c683aa 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -222,9 +222,6 @@ __free_tcb (struct pthread *pd) static int start_thread (void *arg) { - /* One more thread. */ - atomic_increment (&__nptl_nthreads); - struct pthread *pd = (struct pthread *) arg; #if HP_TIMING_AVAIL diff --git a/nptl/sysdeps/pthread/createthread.c b/nptl/sysdeps/pthread/createthread.c index 8620519887..25a2703ae1 100644 --- a/nptl/sysdeps/pthread/createthread.c +++ b/nptl/sysdeps/pthread/createthread.c @@ -64,9 +64,21 @@ do_clone (struct pthread *pd, const struct pthread_attr *attr, until we tell it to. */ lll_lock (pd->lock); + /* One more thread. We cannot have the thread do this itself, since it + might exist but not have been scheduled yet by the time we've returned + and need to check the value to behave correctly. We must do it before + creating the thread, in case it does get scheduled first and then + might mistakenly think it was the only thread. In the failure case, + we momentarily store a false value; this doesn't matter because there + is no kosher thing a signal handler interrupting us right here can do + that cares whether the thread count is correct. */ + atomic_increment (&__nptl_nthreads); + if (ARCH_CLONE (fct, STACK_VARIABLES_ARGS, clone_flags, pd, &pd->tid, TLS_VALUE, &pd->tid) == -1) { + atomic_decrement (&__nptl_nthreads); /* Oops, we lied for a second. */ + /* Failed. If the thread is detached, remove the TCB here since the caller cannot do this. The caller remembered the thread as detached and cannot reverify that it is not since it must -- cgit v1.2.3