source: trunk/kernel/syscalls/sys_mutex.c@ 23

Last change on this file since 23 was 23, checked in by alain, 9 years ago

Introduce syscalls.
File size: 4.0 KB
Line 
1/*
2 * sys_mutex.c - Access a POSIX mutex.
3 *
4 * Author Alain Greiner (2016,2017)
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_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/////////////////////////////////
35int sys_mutex( void * vaddr,
36 uint32_t operation,
37 uint32_t attr )
38{
39 error_t error;
40 paddr_t paddr;
41
42 thread_t * this = CURRENT_THREAD;
43
44 // check vaddr in user vspace
45 error = vmm_v2p_translate( false , vaddr , &paddr );
46 if( error )
47 {
48 printk("\n[ERROR] in %s : illegal virtual address = %x\n",
49 __FUNCTION__ , (intptr_t)vaddr );
50 this->errno = error;
51 return -1;
52 }
53
54 // execute requested operation
55 switch( operation )
56 {
57 ////////////////
58 case MUTEX_INIT:
59 {
60 if( attr != 0 )
61 {
62 printk("\n[ERROR] in %s : mutex attributes non supported yet\n",
63 __FUNCTION__ );
64 this->errno = error;
65 return -1;
66 }
67
68 error = remote_mutex_create( (intptr_t)vaddr );
69
70 if( error )
71 {
72 printk("\n[ERROR] in %s : cannot create mutex\n",
73 __FUNCTION__ );
74 this->errno = error;
75 return -1;
76 }
77 break;
78 }
79 ///////////////////
80 case MUTEX_DESTROY:
81 {
82 xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
83
84 if( mutex_xp == XPTR_NULL ) // user error
85 {
86 printk("\n[ERROR] in %s : mutex %x not registered\n",
87 __FUNCTION__ , (intptr_t)vaddr );
88 this->errno = EINVAL;
89 return -1;
90 }
91 else // success
92 {
93 remote_mutex_destroy( mutex_xp );
94 }
95 break;
96 }
97 ////////////////
98 case MUTEX_LOCK:
99 {
100 xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
101
102 if( mutex_xp == XPTR_NULL ) // user error
103 {
104 printk("\n[ERROR] in %s : mutex %x not registered\n",
105 __FUNCTION__ , (intptr_t)vaddr );
106 this->errno = EINVAL;
107 return -1;
108 }
109 else // success
110 {
111 remote_mutex_lock( mutex_xp );
112 }
113 break;
114 }
115 //////////////////
116 case MUTEX_UNLOCK:
117 {
118 xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
119
120 if( mutex_xp == XPTR_NULL ) // user error
121 {
122 printk("\n[ERROR] in %s : mutex %x not registered\n",
123 __FUNCTION__ , (intptr_t)vaddr );
124 this->errno = EINVAL;
125 return -1;
126 }
127 else // success
128 {
129 remote_mutex_unlock( mutex_xp );
130 }
131 break;
132 }
133 ////////
134 default:
135 {
136 printk("\n[PANIC] in %s : illegal operation type\n", __FUNCTION__ );
137 hal_core_sleep();
138 }
139 }
140
141 return 0;
142
143} // end sys_mutex()
144
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