source: trunk/kernel/libk/remote_spinlock.h @ 434

Last change on this file since 434 was 433, checked in by alain, 7 years ago

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1/*
2 * remote_spinlock.h - kernel remote spinlock definition.
3 *
4 * Authors  Mohamed Karaoui (2016)
5 *          Alain Greiner   (2016)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#ifndef _REMOTE_SPINLOCK_H_
26#define _REMOTE_SPINLOCK_H_
27
28#include <kernel_config.h>
29#include <hal_types.h>
30#include <xlist.h>
31
32/***************************************************************************************
33 * This structure defines a remote spinlock, that can be used to protect
34 * exclusive access to a trans-cluster shared resource. It can be taken by any
35 * thread running in any cluster. All access functions use remote pointers.
36 * The "owner" and "list" are optionnal fields used for debug.
37 * It register the list of all remote spinlocks taken by a given thread.
38 **************************************************************************************/
39
40typedef struct remote_spinlock_s
41{
42    volatile uint32_t     taken;       /*! free if 0 / taken if non zero             */
43
44#if CONFIG_LOCKS_DEBUG
45    xptr_t                owner;       /*! extended pointer on the owner thread      */
46    xlist_entry_t         list;        /*! list of all remote_lock taken by owner    */
47#endif
48
49} 
50remote_spinlock_t;
51
52/***************************************************************************************
53 * This function initializes a remote spinlock.
54 ***************************************************************************************
55 * @ lock_xp : extended pointer on the remote spinlock
56 **************************************************************************************/
57void remote_spinlock_init( xptr_t   lock_xp );
58
59/*******************************************************************************************
60 * This blocking function uses a busy waiting strategy to lock a remote spinlock.
61 * It polls the lock and returns only when the lock has been taken.
62 * All IRQs are disabled and will keep disabled until the lock is released.
63 * It increments the calling thread local_locks count when the lock has been taken.
64 *******************************************************************************************
65 * @ lock_xp    : extended pointer on the remote spinlock.
66 * @ irq_state  : buffer to save the SR state (in the calling thread stack)
67 ******************************************************************************************/
68void remote_spinlock_lock_busy( xptr_t     lock_xp,
69                                uint32_t * irq_state );
70
71/*******************************************************************************************
72 * This function releases a remote busy_waiting spinlock.
73 * It restores the CPU SR state.
74 * It decrements the calling thread locks count.
75 *******************************************************************************************
76 * @ lock_xp    : extended pointer on remote spinlock.
77 * @ irq_state  : value to be resrored in CPU SR
78 ******************************************************************************************/
79void remote_spinlock_unlock_busy( xptr_t     lock_xp,
80                                  uint32_t   irq_state );
81
82/***************************************************************************************
83 * This blocking function locks a remote spinlock.
84 * If the lock is already taken, the calling thread deschedule, and retry
85 * when it is rescheduled.
86 * It increments the calling thread locks count when the lock has been taken.
87 ***************************************************************************************
88 * @ lock_xp   : extended pointer on the remote spinlock
89 **************************************************************************************/
90void remote_spinlock_lock( xptr_t lock_xp );
91
92/***************************************************************************************
93 * This non blocking function try once to lock a remote spinlock.
94 * It increments the calling thread locks count in case of success.
95 ***************************************************************************************
96 * @ lock_xp    : extended pointer on the remote spinlock
97 * @ returns O if success / returns non zero if lock already taken.
98 **************************************************************************************/
99error_t remote_spinlock_trylock( xptr_t  lock_xp );
100
101/***************************************************************************************
102 * This function releases a remote spinlock.
103 * It decrements the calling thread locks count.
104 ***************************************************************************************
105 * @ lock_xp    : extended pointer on the remote spinlock
106 **************************************************************************************/
107void remote_spinlock_unlock( xptr_t  lock_xp );
108
109#endif
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