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Diffstat (limited to 'sysdeps/mach/hurd/pt-mutex.h')
| -rw-r--r-- | sysdeps/mach/hurd/pt-mutex.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/pt-mutex.h b/sysdeps/mach/hurd/pt-mutex.h new file mode 100644 index 0000000..c67453e --- /dev/null +++ b/sysdeps/mach/hurd/pt-mutex.h @@ -0,0 +1,92 @@ +/* Internal definitions for pthreads library. + Copyright (C) 2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Agustina Arzille <avarzille@riseup.net>, 2016. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _PT_MUTEX_H +#define _PT_MUTEX_H 1 + +/* Special ID used to signal an unrecoverable robust mutex. */ +#define NOTRECOVERABLE_ID (1U << 31) + +/* Common path for robust mutexes. Assumes the variable 'ret' + * is bound in the function this is called from. */ +#define ROBUST_LOCK(self, mtxp, cb, ...) \ + if (mtxp->__owner_id == NOTRECOVERABLE_ID) \ + return (ENOTRECOVERABLE); \ + else if (mtxp->__owner_id == self->thread && \ + __getpid () == (int)(mtxp->__lock & LLL_OWNER_MASK)) \ + { \ + if (mtxp->__type == PT_MTX_RECURSIVE) \ + { \ + if (__glibc_unlikely (mtxp->__cnt + 1 == 0)) \ + return (EAGAIN); \ + \ + ++mtxp->__cnt; \ + return (0); \ + } \ + else if (mtxp->__type == PT_MTX_ERRORCHECK) \ + return (EDEADLK); \ + } \ + \ + ret = cb (&mtxp->__lock, ##__VA_ARGS__); \ + if (ret == 0 || ret == EOWNERDEAD) \ + { \ + if (mtxp->__owner_id == ENOTRECOVERABLE) \ + ret = ENOTRECOVERABLE; \ + else \ + { \ + mtxp->__owner_id = self->thread; \ + mtxp->__cnt = 1; \ + if (ret == EOWNERDEAD) \ + { \ + mtxp->__lock = mtxp->__lock | LLL_DEAD_OWNER; \ + atomic_write_barrier (); \ + } \ + } \ + } \ + (void)0 + +/* Check that a thread owns the mutex. For non-robust, task-shared + * objects, we have to check the thread *and* process-id. */ +#define mtx_owned_p(mtx, pt, flags) \ + ((mtx)->__owner_id == (pt)->thread && \ + (((flags) & GSYNC_SHARED) == 0 || \ + (mtx)->__shpid == __getpid ())) + +/* Record a thread as the owner of the mutex. */ +#define mtx_set_owner(mtx, pt, flags) \ + (void) \ + ({ \ + (mtx)->__owner_id = (pt)->thread; \ + if ((flags) & GSYNC_SHARED) \ + (mtx)->__shpid = __getpid (); \ + }) + +/* Redefined mutex types. The +1 is for binary compatibility. */ +#define PT_MTX_NORMAL __PTHREAD_MUTEX_TIMED +#define PT_MTX_RECURSIVE (__PTHREAD_MUTEX_RECURSIVE + 1) +#define PT_MTX_ERRORCHECK (__PTHREAD_MUTEX_ERRORCHECK + 1) + +/* Mutex type, including robustness. */ +#define MTX_TYPE(mtxp) \ + ((mtxp)->__type | ((mtxp)->__flags & PTHREAD_MUTEX_ROBUST)) + +extern int __getpid (void) __attribute__ ((const)); + +#endif /* pt-mutex.h */ |