1 /* Copyright (C) 2002-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 #include <shlib-compat.h>
24 __cleanup_fct_attribute
25 ___pthread_register_cancel_defer (__pthread_unwind_buf_t
*buf
)
27 struct pthread_unwind_buf
*ibuf
= (struct pthread_unwind_buf
*) buf
;
28 struct pthread
*self
= THREAD_SELF
;
31 ibuf
->priv
.data
.prev
= THREAD_GETMEM (self
, cleanup_jmp_buf
);
32 ibuf
->priv
.data
.cleanup
= THREAD_GETMEM (self
, cleanup
);
34 int cancelhandling
= THREAD_GETMEM (self
, cancelhandling
);
36 /* Disable asynchronous cancellation for now. */
37 if (__glibc_unlikely (cancelhandling
& CANCELTYPE_BITMASK
))
40 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
,
42 & ~CANCELTYPE_BITMASK
,
44 if (__glibc_likely (curval
== cancelhandling
))
45 /* Successfully replaced the value. */
48 /* Prepare for the next round. */
49 cancelhandling
= curval
;
52 ibuf
->priv
.data
.canceltype
= (cancelhandling
& CANCELTYPE_BITMASK
53 ? PTHREAD_CANCEL_ASYNCHRONOUS
54 : PTHREAD_CANCEL_DEFERRED
);
56 /* Store the new cleanup handler info. */
57 THREAD_SETMEM (self
, cleanup_jmp_buf
, (struct pthread_unwind_buf
*) buf
);
59 versioned_symbol (libc
, ___pthread_register_cancel_defer
,
60 __pthread_register_cancel_defer
, GLIBC_2_34
);
62 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
63 compat_symbol (libpthread
, ___pthread_register_cancel_defer
,
64 __pthread_register_cancel_defer
, GLIBC_2_3_3
);
68 __cleanup_fct_attribute
69 ___pthread_unregister_cancel_restore (__pthread_unwind_buf_t
*buf
)
71 struct pthread
*self
= THREAD_SELF
;
72 struct pthread_unwind_buf
*ibuf
= (struct pthread_unwind_buf
*) buf
;
74 THREAD_SETMEM (self
, cleanup_jmp_buf
, ibuf
->priv
.data
.prev
);
77 if (ibuf
->priv
.data
.canceltype
!= PTHREAD_CANCEL_DEFERRED
78 && ((cancelhandling
= THREAD_GETMEM (self
, cancelhandling
))
79 & CANCELTYPE_BITMASK
) == 0)
83 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
,
87 if (__glibc_likely (curval
== cancelhandling
))
88 /* Successfully replaced the value. */
91 /* Prepare for the next round. */
92 cancelhandling
= curval
;
95 CANCELLATION_P (self
);
98 versioned_symbol (libc
, ___pthread_unregister_cancel_restore
,
99 __pthread_unregister_cancel_restore
, GLIBC_2_34
);
101 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
102 compat_symbol (libpthread
, ___pthread_unregister_cancel_restore
,
103 __pthread_unregister_cancel_restore
, GLIBC_2_3_3
);