diff options
Diffstat (limited to 'nptl/cleanup_defer_compat.c')
| -rw-r--r-- | nptl/cleanup_defer_compat.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/nptl/cleanup_defer_compat.c b/nptl/cleanup_defer_compat.c new file mode 100644 index 0000000000..a0ed6da88c --- /dev/null +++ b/nptl/cleanup_defer_compat.c @@ -0,0 +1,98 @@ +/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + 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 "pthreadP.h" + + +void +_pthread_cleanup_push_defer (buffer, routine, arg) + struct _pthread_cleanup_buffer *buffer; + void (*routine) (void *); + void *arg; +{ + struct pthread *self = THREAD_SELF; + + buffer->__routine = routine; + buffer->__arg = arg; + buffer->__prev = THREAD_GETMEM (self, cleanup); + + int cancelhandling = THREAD_GETMEM (self, cancelhandling); + + /* Disable asynchronous cancellation for now. */ + if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0)) + while (1) + { + int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, + cancelhandling + & ~CANCELTYPE_BITMASK, + cancelhandling); + if (__builtin_expect (curval == cancelhandling, 1)) + /* Successfully replaced the value. */ + break; + + /* Prepare for the next round. */ + cancelhandling = curval; + } + + buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK + ? PTHREAD_CANCEL_ASYNCHRONOUS + : PTHREAD_CANCEL_DEFERRED); + + THREAD_SETMEM (self, cleanup, buffer); +} +strong_alias (_pthread_cleanup_push_defer, __pthread_cleanup_push_defer) + + +void +_pthread_cleanup_pop_restore (buffer, execute) + struct _pthread_cleanup_buffer *buffer; + int execute; +{ + struct pthread *self = THREAD_SELF; + + THREAD_SETMEM (self, cleanup, buffer->__prev); + + int cancelhandling; + if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0) + && ((cancelhandling = THREAD_GETMEM (self, cancelhandling)) + & CANCELTYPE_BITMASK) == 0) + { + while (1) + { + int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, + cancelhandling + | CANCELTYPE_BITMASK, + cancelhandling); + if (__builtin_expect (curval == cancelhandling, 1)) + /* Successfully replaced the value. */ + break; + + /* Prepare for the next round. */ + cancelhandling = curval; + } + + CANCELLATION_P (self); + } + + /* If necessary call the cleanup routine after we removed the + current cleanup block from the list. */ + if (execute) + buffer->__routine (buffer->__arg); +} +strong_alias (_pthread_cleanup_pop_restore, __pthread_cleanup_pop_restore) |