source: trunk/kernel/syscalls/sys_mutex.c@ 607

Last change on this file since 607 was 566, checked in by alain, 8 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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