diff options
Diffstat (limited to 'nptl/pthread_setcancelstate.c')
| -rw-r--r-- | nptl/pthread_setcancelstate.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/nptl/pthread_setcancelstate.c b/nptl/pthread_setcancelstate.c index a6af063d67..a452c2ec46 100644 --- a/nptl/pthread_setcancelstate.c +++ b/nptl/pthread_setcancelstate.c @@ -34,9 +34,9 @@ __pthread_setcancelstate (state, oldstate) self = THREAD_SELF; + int oldval = THREAD_GETMEM (self, cancelhandling); while (1) { - int oldval = THREAD_GETMEM (self, cancelhandling); int newval = (state == PTHREAD_CANCEL_DISABLE ? oldval | CANCELSTATE_BITMASK : oldval & ~CANCELSTATE_BITMASK); @@ -54,14 +54,18 @@ __pthread_setcancelstate (state, oldstate) /* Update the cancel handling word. This has to be done atomically since other bits could be modified as well. */ - if (! atomic_compare_and_exchange_bool_acq (&self->cancelhandling, - newval, oldval)) + int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval, + oldval); + if (__builtin_expect (curval == oldval, 1)) { if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval)) __do_cancel (); break; } + + /* Prepare for the next round. */ + oldval = curval; } return 0; |