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| author | Ulrich Drepper <drepper@redhat.com> | 2003-04-05 05:21:15 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2003-04-05 05:21:15 +0000 |
| commit | b22d701bb72b928526efff83c019b912f469af72 (patch) | |
| tree | 4474c99dbe6f90a380c378817307646f6f8eff5c /nptl/pthread_setcancelstate.c | |
| parent | 3242201746d74bfbccb8267f8b2e81a9478bf78b (diff) | |
| download | glibc-b22d701bb72b928526efff83c019b912f469af72.tar.gz | |
Update.
2003-04-04 Ulrich Drepper <drepper@redhat.com>
* sysdeps/pthread/createthread.c (create_thread): Add some more
comments explaining when to set multiple_threads and when not.
* pthreadP.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
THREAD_ATOMIC_BIT_SET if not already defined.
* sysdeps/i386/tls.h: Define THREAD_ATOMIC_CMPXCHG_VAL and
THREAD_ATOMIC_BIT_SET:
* sysdeps/x86_64/tls.h: Likewise.
* cleanup_defer.c (_pthread_cleanup_push_defer): Rewrite to use
THREAD_ATOMIC_CMPXCHG_VAL.
(_pthread_cleanup_pop_restore): Likewise.
* cancellation.c (__pthread_enable_asynccancel): Likewise.
(__pthread_enable_asynccancel_2): Likewise.
(__pthread_disable_asynccancel): Likewise.
* libc-cancellation.c (__libc_enable_asynccancel): Likewise.
(__libc_disable_asynccancel): Likewise.
* init.c (sigcancel_handler): Likewise.
* pthread_setcancelstate.c (__pthread_setcancelstate): Likewise.
* pthread_setcanceltype.c (__pthread_setcanceltype): Likewise.
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; |