source: trunk/kernel/syscalls/sys_mutex.c @ 635

Last change on this file since 635 was 635, checked in by alain, 17 months ago

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.

File size: 6.7 KB
Line 
1/*
2 * sys_mutex.c - Access a POSIX mutex.
3 *
4 * Author    Alain Greiner (2016,2017,2018,2019)
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 <hal_vmm.h>
27#include <errno.h>
28#include <thread.h>
29#include <printk.h>
30#include <vmm.h>
31#include <syscalls.h>
32#include <remote_mutex.h>
33
34
35#if DEBUG_SYS_MUTEX
36////////////////////////////////////////////////////
37static char * sys_mutex_op_str( uint32_t operation )
38{
39        if     ( operation == MUTEX_INIT     ) return "INIT";
40        else if( operation == MUTEX_LOCK     ) return "LOCK";
41        else if( operation == MUTEX_UNLOCK   ) return "UNLOCK";
42        else if( operation == MUTEX_TRYLOCK  ) return "TRYLOCK";
43        else if( operation == MUTEX_DESTROY  ) return "DESTROY";
44        else                                   return "undefined";
45}
46#endif
47
48/////////////////////////////////
49int sys_mutex( void     * vaddr,
50               uint32_t   operation,
51               uint32_t   attr )
52{
53        error_t     error;
54    vseg_t    * vseg;      // for vaddr check
55
56    thread_t  * this    = CURRENT_THREAD;
57    process_t * process = this->process;
58
59#if (DEBUG_SYS_MUTEX || CONFIG_INSTRUMENTATION_SYSCALLS)
60uint64_t     tm_start = hal_get_cycles();
61#endif
62
63#if DEBUG_SYS_MUTEX
64if( DEBUG_SYS_MUTEX < tm_start )
65printk("\n[%s] thread[%x,%x] enter for %s / cycle %d\n",
66__FUNCTION__, this->trdid, process->pid, sys_mutex_op_str( operation ), (uint32_t)tm_start );
67#endif
68
69    // check vaddr in user vspace
70        error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg );
71
72        if( error )
73    {
74
75#if DEBUG_SYSCALLS_ERROR
76printk("\n[ERROR] in %s : mutex unmapped %x / thread %x / process %x\n",
77__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
78#endif
79        this->errno = error;
80        return -1;
81    }
82
83    // execute requested operation
84        switch( operation )
85        {   
86        ////////////////
87            case MUTEX_INIT:
88        { 
89            if( attr != 0 )
90            {
91
92#if DEBUG_SYSCALLS_ERROR
93printk("\n[ERROR] in %s : mutex attribute non supported / thread %x / process %x\n",
94__FUNCTION__ , this->trdid , process->pid );
95#endif
96                this->errno = error;
97                return -1;
98            }
99   
100            error = remote_mutex_create( (intptr_t)vaddr );
101
102            if( error )
103            {
104
105#if DEBUG_SYSCALLS_ERROR
106printk("\n[ERROR] in %s : cannot create mutex / thread %x / process %x\n",
107__FUNCTION__ , this->trdid , process->pid );
108#endif
109                this->errno = error;
110                return -1;
111            } 
112                    break;
113                }
114        ///////////////////
115            case MUTEX_DESTROY:
116        {
117            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
118
119            if( mutex_xp == XPTR_NULL )     // user error
120            {
121
122#if DEBUG_SYSCALLS_ERROR
123printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
124__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
125#endif
126                this->errno = EINVAL;
127                return -1;
128            }
129            else                          // success
130            {
131                remote_mutex_destroy( mutex_xp ); 
132            }
133            break;
134        }
135        ////////////////
136            case MUTEX_LOCK:
137        {
138            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
139
140            if( mutex_xp == XPTR_NULL )     // user error
141            {
142
143#if DEBUG_SYSCALLS_ERROR
144printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
145__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
146#endif
147                this->errno = EINVAL;
148                return -1;
149            }
150            else                          // success
151            {
152                remote_mutex_lock( mutex_xp ); 
153            }
154            break;
155        }
156        //////////////////
157            case MUTEX_UNLOCK:
158        {
159            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
160
161            if( mutex_xp == XPTR_NULL )     // user error
162            {
163
164#if DEBUG_SYSCALLS_ERROR
165printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
166__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
167#endif
168                this->errno = EINVAL;
169                return -1;
170            }
171            else                          // success
172            {
173                error = remote_mutex_unlock( mutex_xp ); 
174
175                if( error )
176                {
177
178#if DEBUG_SYSCALLS_ERROR
179printk("\n[ERROR] in %s : mutex %x not owned in UNLOCK / thread %x / process %x\n",
180__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
181#endif
182                    this->errno = EINVAL;
183                    return -1;
184                }
185            }
186            break;
187        }
188        ///////////////////
189            case MUTEX_TRYLOCK:
190        {
191            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
192
193            if( mutex_xp == XPTR_NULL )     // user error
194            {
195
196#if DEBUG_SYSCALLS_ERROR
197printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
198__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
199#endif
200                this->errno = EINVAL;
201                return -1;
202            }
203            else                          // success
204            {
205                error = remote_mutex_trylock( mutex_xp ); 
206
207                if( error ) // non fatal : mutex already taken
208                {
209                    this->errno = EBUSY;
210                    return -1; 
211                }
212            }
213            break;
214        }
215        ////////
216        default: 
217        {
218            assert ( false, "illegal operation type <%x>", operation );
219        }
220        }
221
222    hal_fence();
223
224#if (DEBUG_SYS_MUTEX || CONFIG_INSTRUMENTATION_SYSCALLS)
225uint64_t     tm_end = hal_get_cycles();
226#endif
227
228#if DEBUG_SYS_MUTEX
229if( DEBUG_SYS_MUTEX < tm_end )
230printk("\n[%s] thread[%x,%x] exit for %s / cycle %d\n",
231__FUNCTION__, this->trdid, process->pid, sys_mutex_op_str( operation ), (uint32_t)tm_end );
232#endif
233
234#if CONFIG_INSTRUMENTATION_SYSCALLS
235hal_atomic_add( &syscalls_cumul_cost[SYS_MUTEX] , tm_end - tm_start );
236hal_atomic_add( &syscalls_occurences[SYS_MUTEX] , 1 );
237#endif
238
239        return 0;
240
241}  // end sys_mutex()
242
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