/*
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* Copyright (C) 2008 Philippe Gerum <rpm@xenomai.org>.
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*
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* This 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 of the License, or (at your option) any later version.
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*
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* This 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#ifndef _COPPERPLATE_SYNCOBJ_H
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#define _COPPERPLATE_SYNCOBJ_H
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#include <pthread.h>
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#include <time.h>
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#include <boilerplate/list.h>
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#include <boilerplate/lock.h>
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#include <copperplate/reference.h>
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/* syncobj->flags */
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#define SYNCOBJ_FIFO 0x0
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#define SYNCOBJ_PRIO 0x1
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#define SYNCOBJ_LOCKED 0x2
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/* threadobj->wait_status */
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#define SYNCOBJ_FLUSHED 0x1
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#define SYNCOBJ_SIGNALED 0x2
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#define SYNCOBJ_DRAINWAIT 0x4
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#define SYNCOBJ_MAGIC 0xf9f99f9f
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struct threadobj;
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struct syncstate {
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int state;
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};
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#ifdef CONFIG_XENO_COBALT
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#include <boilerplate/atomic.h>
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#include <cobalt/uapi/monitor.h>
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struct syncobj_corespec {
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cobalt_monitor_t monitor;
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};
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#else /* CONFIG_XENO_MERCURY */
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struct syncobj_corespec {
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pthread_mutex_t lock;
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pthread_cond_t drain_sync;
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};
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#endif /* CONFIG_XENO_MERCURY */
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struct syncobj {
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unsigned int magic;
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int flags;
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int wait_count;
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struct listobj grant_list;
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int grant_count;
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struct listobj drain_list;
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int drain_count;
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struct syncobj_corespec core;
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fnref_type(void (*)(struct syncobj *sobj)) finalizer;
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};
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#define syncobj_for_each_grant_waiter(sobj, pos) \
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list_for_each_entry(pos, &(sobj)->grant_list, wait_link)
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#define syncobj_for_each_grant_waiter_safe(sobj, pos, tmp) \
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list_for_each_entry_safe(pos, tmp, &(sobj)->grant_list, wait_link)
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#define syncobj_for_each_drain_waiter(sobj, pos) \
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list_for_each_entry(pos, &(sobj)->drain_list, wait_link)
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#define syncobj_for_each_drain_waiter_safe(sobj, pos, tmp) \
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list_for_each_entry_safe(pos, tmp, &(sobj)->drain_list, wait_link)
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void __syncobj_cleanup_wait(struct syncobj *sobj,
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struct threadobj *thobj);
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#ifdef CONFIG_XENO_DEBUG
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static inline void __syncobj_tag_locked(struct syncobj *sobj)
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{
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sobj->flags |= SYNCOBJ_LOCKED;
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}
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static inline void __syncobj_tag_unlocked(struct syncobj *sobj)
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{
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assert(sobj->flags & SYNCOBJ_LOCKED);
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sobj->flags &= ~SYNCOBJ_LOCKED;
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}
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static inline void __syncobj_check_locked(struct syncobj *sobj)
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{
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assert(sobj->flags & SYNCOBJ_LOCKED);
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}
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#else /* !CONFIG_XENO_DEBUG */
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static inline void __syncobj_tag_locked(struct syncobj *sobj)
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{
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}
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static inline void __syncobj_tag_unlocked(struct syncobj *sobj)
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{
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}
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static inline void __syncobj_check_locked(struct syncobj *sobj)
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{
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}
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#endif /* !CONFIG_XENO_DEBUG */
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#ifdef __cplusplus
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extern "C" {
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#endif
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int __syncobj_broadcast_drain(struct syncobj *sobj, int reason);
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int __syncobj_broadcast_grant(struct syncobj *sobj, int reason);
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int syncobj_init(struct syncobj *sobj, clockid_t clk_id, int flags,
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fnref_type(void (*)(struct syncobj *sobj)) finalizer) __must_check;
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int syncobj_wait_grant(struct syncobj *sobj,
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const struct timespec *timeout,
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struct syncstate *syns) __must_check;
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struct threadobj *syncobj_grant_one(struct syncobj *sobj);
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void syncobj_grant_to(struct syncobj *sobj,
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struct threadobj *thobj);
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struct threadobj *syncobj_peek_grant(struct syncobj *sobj);
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struct threadobj *syncobj_peek_drain(struct syncobj *sobj);
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int syncobj_lock(struct syncobj *sobj,
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struct syncstate *syns) __must_check;
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void syncobj_unlock(struct syncobj *sobj,
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struct syncstate *syns);
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int syncobj_wait_drain(struct syncobj *sobj,
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const struct timespec *timeout,
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struct syncstate *syns) __must_check;
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int syncobj_destroy(struct syncobj *sobj,
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struct syncstate *syns);
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void syncobj_uninit(struct syncobj *sobj);
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static inline int syncobj_grant_wait_p(struct syncobj *sobj)
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{
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__syncobj_check_locked(sobj);
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return !list_empty(&sobj->grant_list);
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}
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static inline int syncobj_count_grant(struct syncobj *sobj)
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{
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__syncobj_check_locked(sobj);
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return sobj->grant_count;
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}
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static inline int syncobj_count_drain(struct syncobj *sobj)
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{
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__syncobj_check_locked(sobj);
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return sobj->drain_count;
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}
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static inline int syncobj_drain_wait_p(struct syncobj *sobj)
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{
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__syncobj_check_locked(sobj);
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return !list_empty(&sobj->drain_list);
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}
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static inline int syncobj_drain(struct syncobj *sobj)
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{
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int ret = 0;
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__syncobj_check_locked(sobj);
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if (sobj->drain_count > 0)
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ret = __syncobj_broadcast_drain(sobj, SYNCOBJ_SIGNALED);
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return ret;
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}
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static inline int syncobj_grant_all(struct syncobj *sobj)
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{
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int ret = 0;
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__syncobj_check_locked(sobj);
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if (sobj->grant_count > 0)
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ret = __syncobj_broadcast_grant(sobj, SYNCOBJ_SIGNALED);
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return ret;
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}
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static inline int syncobj_flush(struct syncobj *sobj)
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{
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__syncobj_check_locked(sobj);
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if (sobj->grant_count > 0)
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__syncobj_broadcast_grant(sobj, SYNCOBJ_FLUSHED);
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if (sobj->drain_count > 0)
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__syncobj_broadcast_drain(sobj, SYNCOBJ_FLUSHED);
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return sobj->wait_count;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _COPPERPLATE_SYNCOBJ_H */
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