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authorUlrich Drepper <drepper@redhat.com>2003-04-12 00:14:16 +0000
committerUlrich Drepper <drepper@redhat.com>2003-04-12 00:14:16 +0000
commit6efd481484e5d8d47b834fd034dc62f4c036d2cf (patch)
treec4bd9e169d534ceaf83f4b3f6b7f034e0e1cb379 /nptl/cleanup_defer_compat.c
parent32b0da568de098fc2d62da7cf6a06ddbaba156d7 (diff)
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Declare __pthread_unwind. Define __do_cancel to use it. Declare old cleanup handler installation functions.
Diffstat (limited to 'nptl/cleanup_defer_compat.c')
-rw-r--r--nptl/cleanup_defer_compat.c98
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 0000000..a0ed6da
--- /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)