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/* Copyright (C) 2002-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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, see
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include "pthreadP.h"
#include <shlib-compat.h>
void
__cleanup_fct_attribute
___pthread_register_cancel_defer (__pthread_unwind_buf_t *buf)
{
struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
struct pthread *self = THREAD_SELF;
/* Store old info. */
ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
ibuf->priv.data.cleanup = THREAD_GETMEM (self, cleanup);
int cancelhandling = atomic_load_relaxed (&self->cancelhandling);
if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK))
{
int newval;
do
{
newval = cancelhandling & ~CANCELTYPE_BITMASK;
}
while (!atomic_compare_exchange_weak_acquire (&self->cancelhandling,
&cancelhandling,
newval));
}
ibuf->priv.data.canceltype = (cancelhandling & CANCELTYPE_BITMASK
? PTHREAD_CANCEL_ASYNCHRONOUS
: PTHREAD_CANCEL_DEFERRED);
/* Store the new cleanup handler info. */
THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf);
}
versioned_symbol (libc, ___pthread_register_cancel_defer,
__pthread_register_cancel_defer, GLIBC_2_34);
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
compat_symbol (libpthread, ___pthread_register_cancel_defer,
__pthread_register_cancel_defer, GLIBC_2_3_3);
#endif
void
__cleanup_fct_attribute
___pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf)
{
struct pthread *self = THREAD_SELF;
struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev);
if (ibuf->priv.data.canceltype == PTHREAD_CANCEL_DEFERRED)
return;
int cancelhandling = atomic_load_relaxed (&self->cancelhandling);
if ((cancelhandling & CANCELTYPE_BITMASK) == 0)
{
int newval;
do
{
newval = cancelhandling | CANCELTYPE_BITMASK;
}
while (!atomic_compare_exchange_weak_acquire (&self->cancelhandling,
&cancelhandling, newval));
if (cancel_enabled_and_canceled (cancelhandling))
__do_cancel (PTHREAD_CANCELED);
}
}
versioned_symbol (libc, ___pthread_unregister_cancel_restore,
__pthread_unregister_cancel_restore, GLIBC_2_34);
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
compat_symbol (libpthread, ___pthread_unregister_cancel_restore,
__pthread_unregister_cancel_restore, GLIBC_2_3_3);
#endif
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