diff options
| -rw-r--r-- | nptl/ChangeLog | 6 | ||||
| -rw-r--r-- | nptl/cancellation.c | 8 | ||||
| -rw-r--r-- | nptl/libc-cancellation.c | 8 | ||||
| -rw-r--r-- | nptl/pthread_cancel.c | 8 |
4 files changed, 16 insertions, 14 deletions
diff --git a/nptl/ChangeLog b/nptl/ChangeLog index 74a2a73666..f3bd32f577 100644 --- a/nptl/ChangeLog +++ b/nptl/ChangeLog @@ -1,5 +1,11 @@ 2009-05-15 Ulrich Drepper <drepper@redhat.com> + * cancellation.c (__pthread_disable_asynccancel): Correct the bits + to test when deciding on the delay. + * libc-cancellation.c (__libc_disable_asynccancel): Likewise. + * pthread_cancel.c: Close race between deciding on sending a signal + and setting the CANCELING_BIT bit. + * cancellation.c (__pthread_disable_asynccancel): Don't return if thread is canceled. * libc-cancellation.c (__libc_disable_asynccancel): Likewise. diff --git a/nptl/cancellation.c b/nptl/cancellation.c index 4d528cfc2f..2a6f83d28a 100644 --- a/nptl/cancellation.c +++ b/nptl/cancellation.c @@ -72,10 +72,6 @@ __pthread_disable_asynccancel (int oldtype) struct pthread *self = THREAD_SELF; int newval; -#ifdef THREAD_ATOMIC_AND - THREAD_ATOMIC_AND (self, cancelhandling, ~CANCELTYPE_BITMASK); - newval = THREAD_GETMEM (self, cancelhandling); -#else int oldval = THREAD_GETMEM (self, cancelhandling); while (1) @@ -93,13 +89,13 @@ __pthread_disable_asynccancel (int oldtype) /* Prepare the next round. */ oldval = curval; } -#endif /* We cannot return when we are being canceled. Upon return the thread might be things which would have to be undone. The following loop should loop until the cancellation signal is delivered. */ - while (__builtin_expect (newval & CANCELED_BITMASK, 0)) + while (__builtin_expect ((newval & (CANCELING_BITMASK | CANCELED_BITMASK)) + == CANCELING_BITMASK, 0)) { lll_futex_wait (&self->cancelhandling, newval, LLL_PRIVATE); newval = THREAD_GETMEM (self, cancelhandling); diff --git a/nptl/libc-cancellation.c b/nptl/libc-cancellation.c index 35ac82b3d1..cada464d2b 100644 --- a/nptl/libc-cancellation.c +++ b/nptl/libc-cancellation.c @@ -88,10 +88,6 @@ __libc_disable_asynccancel (int oldtype) struct pthread *self = THREAD_SELF; int newval; -#ifdef THREAD_ATOMIC_AND - THREAD_ATOMIC_AND (self, cancelhandling, ~CANCELTYPE_BITMASK); - newval = THREAD_GETMEM (self, cancelhandling); -#else int oldval = THREAD_GETMEM (self, cancelhandling); while (1) @@ -109,13 +105,13 @@ __libc_disable_asynccancel (int oldtype) /* Prepare the next round. */ oldval = curval; } -#endif /* We cannot return when we are being canceled. Upon return the thread might be things which would have to be undone. The following loop should loop until the cancellation signal is delivered. */ - while (__builtin_expect (newval & CANCELED_BITMASK, 0)) + while (__builtin_expect ((newval & (CANCELING_BITMASK | CANCELED_BITMASK)) + == CANCELING_BITMASK, 0)) { lll_futex_wait (&self->cancelhandling, newval, LLL_PRIVATE); newval = THREAD_GETMEM (self, cancelhandling); diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c index a13af56b37..55bb0da922 100644 --- a/nptl/pthread_cancel.c +++ b/nptl/pthread_cancel.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003, 2004, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -44,6 +44,7 @@ pthread_cancel (th) int newval; do { + again: oldval = pd->cancelhandling; newval = oldval | CANCELING_BITMASK | CANCELED_BITMASK; @@ -59,7 +60,10 @@ pthread_cancel (th) if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval)) { /* Mark the cancellation as "in progress". */ - atomic_bit_set (&pd->cancelhandling, CANCELING_BIT); + if (atomic_compare_and_exchange_bool_acq (&pd->cancelhandling, + oldval | CANCELING_BITMASK, + oldval)) + goto again; /* The cancellation handler will take care of marking the thread as canceled. */ |