diff options
Diffstat (limited to 'nptl/sysdeps/pthread/pthread_cond_signal.c')
-rw-r--r-- | nptl/sysdeps/pthread/pthread_cond_signal.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/nptl/sysdeps/pthread/pthread_cond_signal.c b/nptl/sysdeps/pthread/pthread_cond_signal.c new file mode 100644 index 0000000..5a9bbca --- /dev/null +++ b/nptl/sysdeps/pthread/pthread_cond_signal.c @@ -0,0 +1,61 @@ +/* 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 <endian.h> +#include <errno.h> +#include <sysdep.h> +#include <lowlevellock.h> +#include <pthread.h> +#include <pthreadP.h> + +#include <shlib-compat.h> +#include <kernel-features.h> + + +int +__pthread_cond_signal (cond) + pthread_cond_t *cond; +{ + /* Make sure we are alone. */ + lll_mutex_lock (cond->__data.__lock); + + /* Are there any waiters to be woken? */ + if (cond->__data.__total_seq > cond->__data.__wakeup_seq) + { + /* Yes. Mark one of them as woken. */ + ++cond->__data.__wakeup_seq; + ++cond->__data.__futex; + + /* Wake one. */ + if (! __builtin_expect (lll_futex_wake_unlock (&cond->__data.__futex, 1, + 1, &cond->__data.__lock), + 0)) + return 0; + + lll_futex_wake (&cond->__data.__futex, 1); + } + + /* We are done. */ + lll_mutex_unlock (cond->__data.__lock); + + return 0; +} + +versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal, + GLIBC_2_3_2); |