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author | Ulrich Drepper <drepper@redhat.com> | 2006-10-28 05:15:26 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 2006-10-28 05:15:26 +0000 |
commit | eb0a3d0cab507fecefe390a340f74ab8e5cf7831 (patch) | |
tree | c97ac1c33a78c454c0aeb520624af29c724355d2 /nptl/pthread_barrier_wait.c | |
parent | 006a8f6f626e6e4d30b73c2ee20377b6a8cce1b7 (diff) | |
download | glibc-eb0a3d0cab507fecefe390a340f74ab8e5cf7831.tar.gz glibc-eb0a3d0cab507fecefe390a340f74ab8e5cf7831.tar.xz glibc-eb0a3d0cab507fecefe390a340f74ab8e5cf7831.zip |
* sysdeps/pthread/pthread_barrier_wait.c: Move to...
* pthread_barrier_wait.c: ...here. * sysdeps/pthread/pthread_cond_broadcast.c: Move to... * pthread_cond_broadcast.c: ...here. * sysdeps/pthread/pthread_cond_signal.c: Move to... * pthread_cond_signal.c: ...here. * sysdeps/pthread/pthread_cond_timedwait.c: Move to... * pthread_cond_timedwait.c: ...here. * sysdeps/pthread/pthread_cond_wait.c: Move to... * pthread_cond_wait.c: ...here. * sysdeps/pthread/pthread_once.c: Move to... * pthread_once.c: ...here. * sysdeps/pthread/pthread_rwlock_rdlock.c: Move to... * pthread_rwlock_rdlock.c: ...here. * sysdeps/pthread/pthread_rwlock_timedrdlock.c: Move to... * pthread_rwlock_timedrdlock.c: ...here. * sysdeps/pthread/pthread_rwlock_timedwrlock.c: Move to... * pthread_rwlock_timedwrlock.c: ...here. * sysdeps/pthread/pthread_rwlock_unlock.c: Move to... * pthread_rwlock_unlock.c: ...here. * sysdeps/pthread/pthread_rwlock_wrlock.c: Move to... * pthread_rwlock_wrlock.c: ...here. * sysdeps/pthread/pthread_spin_destroy.c: Move to... * pthread_spin_destroy.c: ...here. * sysdeps/pthread/pthread_spin_init.c: Move to... * pthread_spin_init.c: ...here. * sysdeps/pthread/pthread_spin_unlock.c: Move to... * pthread_spin_unlock.c: ...here. * sysdeps/pthread/pthread_getcpuclockid.c: Move to... * pthread_getcpuclockid.c: ...here.
Diffstat (limited to 'nptl/pthread_barrier_wait.c')
-rw-r--r-- | nptl/pthread_barrier_wait.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/nptl/pthread_barrier_wait.c b/nptl/pthread_barrier_wait.c new file mode 100644 index 0000000000..c6b563f242 --- /dev/null +++ b/nptl/pthread_barrier_wait.c @@ -0,0 +1,77 @@ +/* Copyright (C) 2003, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <sysdep.h> +#include <lowlevellock.h> +#include <pthreadP.h> + + +/* Wait on barrier. */ +int +pthread_barrier_wait (barrier) + pthread_barrier_t *barrier; +{ + struct pthread_barrier *ibarrier = (struct pthread_barrier *) barrier; + int result = 0; + + /* Make sure we are alone. */ + lll_lock (ibarrier->lock); + + /* One more arrival. */ + --ibarrier->left; + + /* Are these all? */ + if (ibarrier->left == 0) + { + /* Yes. Increment the event counter to avoid invalid wake-ups and + tell the current waiters that it is their turn. */ + ++ibarrier->curr_event; + + /* Wake up everybody. */ + lll_futex_wake (&ibarrier->curr_event, INT_MAX); + + /* This is the thread which finished the serialization. */ + result = PTHREAD_BARRIER_SERIAL_THREAD; + } + else + { + /* The number of the event we are waiting for. The barrier's event + number must be bumped before we continue. */ + unsigned int event = ibarrier->curr_event; + + /* Before suspending, make the barrier available to others. */ + lll_unlock (ibarrier->lock); + + /* Wait for the event counter of the barrier to change. */ + do + lll_futex_wait (&ibarrier->curr_event, event); + while (event == ibarrier->curr_event); + } + + /* Make sure the init_count is stored locally or in a register. */ + unsigned int init_count = ibarrier->init_count; + + /* If this was the last woken thread, unlock. */ + if (atomic_increment_val (&ibarrier->left) == init_count) + /* We are done. */ + lll_unlock (ibarrier->lock); + + return result; +} |