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33574c17 ST |
1 | /* pthread_mutex_transfer_np. Transfer mutex ownership to another thread. |
2 | Hurd version. | |
dff8da6b | 3 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
33574c17 ST |
4 | This file is part of the GNU C Library. |
5 | ||
ad2b41bf ST |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
33574c17 | 10 | |
ad2b41bf | 11 | The GNU C Library is distributed in the hope that it will be useful, |
33574c17 | 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
ad2b41bf ST |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. | |
33574c17 | 15 | |
ad2b41bf ST |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see | |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
33574c17 ST |
19 | |
20 | #include <pthread.h> | |
21 | #include <stdlib.h> | |
22 | #include <assert.h> | |
23 | #include <pt-internal.h> | |
24 | #include "pt-mutex.h" | |
25 | #include <hurdlock.h> | |
26 | ||
27 | int | |
28 | __pthread_mutex_transfer_np (pthread_mutex_t *mtxp, pthread_t th) | |
29 | { | |
30 | struct __pthread *self = _pthread_self (); | |
31 | struct __pthread *pt = __pthread_getid (th); | |
32 | ||
33 | if (pt == NULL) | |
34 | return ESRCH; | |
35 | else if (pt == self) | |
36 | return 0; | |
37 | ||
38 | int ret = 0; | |
39 | int flags = mtxp->__flags & GSYNC_SHARED; | |
40 | ||
41 | switch (MTX_TYPE (mtxp)) | |
42 | { | |
43 | case PT_MTX_NORMAL: | |
44 | break; | |
45 | ||
46 | case PT_MTX_RECURSIVE: | |
47 | case PT_MTX_ERRORCHECK: | |
48 | if (!mtx_owned_p (mtxp, self, flags)) | |
49 | ret = EPERM; | |
50 | else | |
51 | mtx_set_owner (mtxp, pt, flags); | |
52 | ||
53 | break; | |
54 | ||
55 | case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST: | |
56 | case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST: | |
57 | case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST: | |
58 | /* Note that this can be used to transfer an inconsistent | |
59 | * mutex as well. The new owner will still have the same | |
60 | * flags as the original. */ | |
aa0e4663 JM |
61 | if (mtxp->__owner_id != self->thread |
62 | || (int) (mtxp->__lock & LLL_OWNER_MASK) != __getpid ()) | |
33574c17 ST |
63 | ret = EPERM; |
64 | else | |
65 | mtxp->__owner_id = pt->thread; | |
66 | ||
67 | break; | |
68 | ||
69 | default: | |
70 | ret = EINVAL; | |
71 | } | |
72 | ||
73 | return ret; | |
74 | } | |
75 | ||
76 | weak_alias (__pthread_mutex_transfer_np, pthread_mutex_transfer_np) |