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91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/* Internal definitions for pthreads library.
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Copyright (C) 2016-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _PT_MUTEX_H
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#define _PT_MUTEX_H 1
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/* Special ID used to signal an unrecoverable robust mutex. */
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#define NOTRECOVERABLE_ID (1U << 31)
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/* Common path for robust mutexes. Assumes the variable 'ret'
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* is bound in the function this is called from. */
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#define ROBUST_LOCK(self, mtxp, cb, ...) \
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if (mtxp->__owner_id == NOTRECOVERABLE_ID) \
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return ENOTRECOVERABLE; \
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else if (mtxp->__owner_id == self->thread \
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&& __getpid () == (int)(mtxp->__lock & LLL_OWNER_MASK)) \
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{ \
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if (mtxp->__type == PT_MTX_RECURSIVE) \
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{ \
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if (__glibc_unlikely (mtxp->__cnt + 1 == 0)) \
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return EAGAIN; \
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\
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++mtxp->__cnt; \
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return 0; \
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} \
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else if (mtxp->__type == PT_MTX_ERRORCHECK) \
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return EDEADLK; \
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} \
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\
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ret = cb (mtxp->__lock, ##__VA_ARGS__); \
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if (ret == 0 || ret == EOWNERDEAD) \
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{ \
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if (mtxp->__owner_id == ENOTRECOVERABLE) \
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ret = ENOTRECOVERABLE; \
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else \
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{ \
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mtxp->__owner_id = self->thread; \
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mtxp->__cnt = 1; \
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if (ret == EOWNERDEAD) \
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{ \
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mtxp->__lock = mtxp->__lock | LLL_DEAD_OWNER; \
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atomic_write_barrier (); \
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} \
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} \
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} \
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(void)0
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/* Check that a thread owns the mutex. For non-robust, task-shared
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* objects, we have to check the thread *and* process-id. */
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#define mtx_owned_p(mtx, pt, flags) \
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((mtx)->__owner_id == (pt)->thread \
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&& (((flags) & GSYNC_SHARED) == 0 \
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|| (mtx)->__shpid == __getpid ()))
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/* Record a thread as the owner of the mutex. */
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#define mtx_set_owner(mtx, pt, flags) \
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(void) \
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({ \
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(mtx)->__owner_id = (pt)->thread; \
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if ((flags) & GSYNC_SHARED) \
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(mtx)->__shpid = __getpid (); \
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})
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/* Redefined mutex types. The +1 is for binary compatibility. */
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#define PT_MTX_NORMAL __PTHREAD_MUTEX_TIMED
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#define PT_MTX_RECURSIVE (__PTHREAD_MUTEX_RECURSIVE + 1)
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#define PT_MTX_ERRORCHECK (__PTHREAD_MUTEX_ERRORCHECK + 1)
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/* Mutex type, including robustness. */
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#define MTX_TYPE(mtxp) \
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((mtxp)->__type | ((mtxp)->__flags & PTHREAD_MUTEX_ROBUST))
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extern int __getpid (void) __attribute__ ((const));
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#endif /* pt-mutex.h */
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