| 1 | /* pthread_mutex_transfer_np. Transfer mutex ownership to another thread. |
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| 2 | Hurd version. |
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| 3 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #include <pthread.h> |
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| 21 | #include <stdlib.h> |
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| 22 | #include <assert.h> |
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| 23 | #include <pt-internal.h> |
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| 24 | #include "pt-mutex.h" |
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| 25 | #include <hurdlock.h> |
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| 26 | |
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| 27 | int |
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| 28 | __pthread_mutex_transfer_np (pthread_mutex_t *mtxp, pthread_t th) |
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| 29 | { |
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| 30 | struct __pthread *self = _pthread_self (); |
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| 31 | struct __pthread *pt = __pthread_getid (th); |
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| 32 | |
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| 33 | if (pt == NULL) |
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| 34 | return ESRCH; |
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| 35 | else if (pt == self) |
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| 36 | return 0; |
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| 37 | |
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| 38 | int ret = 0; |
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| 39 | int flags = mtxp->__flags & GSYNC_SHARED; |
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| 40 | |
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| 41 | switch (MTX_TYPE (mtxp)) |
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| 42 | { |
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| 43 | case PT_MTX_NORMAL: |
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| 44 | break; |
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| 45 | |
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| 46 | case PT_MTX_RECURSIVE: |
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| 47 | case PT_MTX_ERRORCHECK: |
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| 48 | if (!mtx_owned_p (mtxp, self, flags)) |
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| 49 | ret = EPERM; |
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| 50 | else |
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| 51 | mtx_set_owner (mtxp, pt, flags); |
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| 52 | |
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| 53 | break; |
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| 54 | |
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| 55 | case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST: |
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| 56 | case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST: |
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| 57 | case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST: |
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| 58 | /* Note that this can be used to transfer an inconsistent |
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| 59 | * mutex as well. The new owner will still have the same |
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| 60 | * flags as the original. */ |
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| 61 | if (mtxp->__owner_id != self->thread |
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| 62 | || (int) (mtxp->__lock & LLL_OWNER_MASK) != __getpid ()) |
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| 63 | ret = EPERM; |
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| 64 | else |
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| 65 | mtxp->__owner_id = pt->thread; |
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| 66 | |
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| 67 | break; |
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| 68 | |
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| 69 | default: |
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| 70 | ret = EINVAL; |
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| 71 | } |
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| 72 | |
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| 73 | return ret; |
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| 74 | } |
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| 75 | |
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| 76 | weak_alias (__pthread_mutex_transfer_np, pthread_mutex_transfer_np) |
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| 77 | |
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