source: trunk/kernel/syscalls/sys_mutex.c @ 608

Last change on this file since 608 was 566, checked in by alain, 6 years ago

Complete restructuration of kernel locks.
File size: 6.5 KB
Line 
1/*
2 * sys_mutex.c - Access a POSIX mutex.
3 *
4 * Author    Alain Greiner (2016,2017,2018)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_kernel_types.h>
25#include <hal_special.h>
26#include <errno.h>
27#include <thread.h>
28#include <printk.h>
29#include <vmm.h>
30#include <syscalls.h>
31#include <remote_mutex.h>
32
33
34#if DEBUG_SYS_MUTEX
35////////////////////////////////////////////////////
36static char * sys_mutex_op_str( uint32_t operation )
37{
38        if     ( operation == MUTEX_INIT     ) return "INIT";
39        else if( operation == MUTEX_LOCK     ) return "LOCK";
40        else if( operation == MUTEX_UNLOCK   ) return "UNLOCK";
41        else if( operation == MUTEX_TRYLOCK  ) return "TRYLOCK";
42        else if( operation == MUTEX_DESTROY  ) return "DESTROY";
43        else                                   return "undefined";
44}
45#endif
46
47/////////////////////////////////
48int sys_mutex( void     * vaddr,
49               uint32_t   operation,
50               uint32_t   attr )
51{
52        error_t     error;
53    vseg_t    * vseg;      // for vaddr check
54
55    thread_t  * this    = CURRENT_THREAD;
56    process_t * process = this->process;
57
58#if DEBUG_SYS_MUTEX
59uint64_t    tm_start;
60uint64_t    tm_end;
61tm_start = hal_get_cycles();
62if( DEBUG_SYS_MUTEX < tm_start )
63printk("\n[DBG] %s : thread %x in process %x enter for %s / cycle %d\n",
64__FUNCTION__, this->trdid, process->pid, sys_mutex_op_str( operation ), (uint32_t)tm_start );
65#endif
66
67    // check vaddr in user vspace
68        error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg );
69
70        if( error )
71    {
72
73#if DEBUG_SYSCALLS_ERROR
74printk("\n[ERROR] in %s : mutex unmapped %x / thread %x / process %x\n",
75__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
76vmm_display( process , false );
77#endif
78        this->errno = error;
79        return -1;
80    }
81
82    // execute requested operation
83        switch( operation )
84        {   
85        ////////////////
86            case MUTEX_INIT:
87        { 
88            if( attr != 0 )
89            {
90
91#if DEBUG_SYSCALLS_ERROR
92printk("\n[ERROR] in %s : mutex attribute non supported / thread %x / process %x\n",
93__FUNCTION__ , this->trdid , process->pid );
94#endif
95                this->errno = error;
96                return -1;
97            }
98   
99            error = remote_mutex_create( (intptr_t)vaddr );
100
101            if( error )
102            {
103
104#if DEBUG_SYSCALLS_ERROR
105printk("\n[ERROR] in %s : cannot create mutex / thread %x / process %x\n",
106__FUNCTION__ , this->trdid , process->pid );
107#endif
108                this->errno = error;
109                return -1;
110            } 
111                    break;
112                }
113        ///////////////////
114            case MUTEX_DESTROY:
115        {
116            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
117
118            if( mutex_xp == XPTR_NULL )     // user error
119            {
120
121#if DEBUG_SYSCALLS_ERROR
122printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
123__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
124#endif
125                this->errno = EINVAL;
126                return -1;
127            }
128            else                          // success
129            {
130                remote_mutex_destroy( mutex_xp ); 
131            }
132            break;
133        }
134        ////////////////
135            case MUTEX_LOCK:
136        {
137            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
138
139            if( mutex_xp == XPTR_NULL )     // user error
140            {
141
142#if DEBUG_SYSCALLS_ERROR
143printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
144__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
145#endif
146                this->errno = EINVAL;
147                return -1;
148            }
149            else                          // success
150            {
151                remote_mutex_lock( mutex_xp ); 
152            }
153            break;
154        }
155        //////////////////
156            case MUTEX_UNLOCK:
157        {
158            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
159
160            if( mutex_xp == XPTR_NULL )     // user error
161            {
162
163#if DEBUG_SYSCALLS_ERROR
164printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
165__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
166#endif
167                this->errno = EINVAL;
168                return -1;
169            }
170            else                          // success
171            {
172                error = remote_mutex_unlock( mutex_xp ); 
173
174                if( error )
175                {
176
177#if DEBUG_SYSCALLS_ERROR
178printk("\n[ERROR] in %s : mutex %x not owned in UNLOCK / thread %x / process %x\n",
179__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
180#endif
181                    this->errno = EINVAL;
182                    return -1;
183                }
184            }
185            break;
186        }
187        ///////////////////
188            case MUTEX_TRYLOCK:
189        {
190            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
191
192            if( mutex_xp == XPTR_NULL )     // user error
193            {
194
195#if DEBUG_SYSCALLS_ERROR
196printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
197__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
198#endif
199                this->errno = EINVAL;
200                return -1;
201            }
202            else                          // success
203            {
204                error = remote_mutex_trylock( mutex_xp ); 
205
206                if( error ) // non fatal : mutex already taken
207                {
208                    this->errno = EBUSY;
209                    return -1; 
210                }
211            }
212            break;
213        }
214        ////////
215        default: 
216        {
217            assert ( false, "illegal operation type <%x>", operation );
218        }
219        }
220
221    hal_fence();
222
223#if DEBUG_SYS_MUTEX
224tm_end = hal_get_cycles();
225if( DEBUG_SYS_MUTEX < tm_start )
226printk("\n[DBG] %s : thread %x in process %x exit for %s / cost %d / cycle %d\n",
227__FUNCTION__, this->trdid, process->pid, sys_mutex_op_str( operation ),
228(uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
229#endif
230
231        return 0;
232
233}  // end sys_mutex()
234
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