source: trunk/kernel/syscalls/sys_mutex.c @ 460

Last change on this file since 460 was 457, checked in by alain, 6 years ago

This version modifies the exec syscall and fixes a large number of small bugs.
The version number has been updated (0.1)
File size: 4.4 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/////////////////////////////////
35int sys_mutex( void     * vaddr,
36               uint32_t   operation,
37               uint32_t   attr )
38{
39        error_t     error;
40    vseg_t    * vseg;
41
42    thread_t  * this    = CURRENT_THREAD;
43    process_t * process = this->process;
44
45    // check vaddr in user vspace
46        error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg );
47
48        if( error )
49    {
50
51#if DEBUG_SYSCALLS_ERROR
52printk("\n[ERROR] in %s : mutex unmapped %x / thread %x / process %x\n",
53__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
54vmm_display( process , false );
55#endif
56        this->errno = error;
57        return -1;
58    }
59
60    // execute requested operation
61        switch( operation )
62        {   
63        ////////////////
64            case MUTEX_INIT:
65        { 
66            if( attr != 0 )
67            {
68
69#if DEBUG_SYSCALLS_ERROR
70printk("\n[ERROR] in %s : mutex attribute non supported / thread %x / process %x\n",
71__FUNCTION__ , this->trdid , process->pid );
72#endif
73                this->errno = error;
74                return -1;
75            }
76   
77            error = remote_mutex_create( (intptr_t)vaddr );
78
79            if( error )
80            {
81
82#if DEBUG_SYSCALLS_ERROR
83printk("\n[ERROR] in %s : cannot create mutex / thread %x / process %x\n",
84__FUNCTION__ , this->trdid , process->pid );
85#endif
86                this->errno = error;
87                return -1;
88            } 
89                    break;
90                }
91        ///////////////////
92            case MUTEX_DESTROY:
93        {
94            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
95
96            if( mutex_xp == XPTR_NULL )     // user error
97            {
98
99#if DEBUG_SYSCALLS_ERROR
100printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
101__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
102#endif
103                this->errno = EINVAL;
104                return -1;
105            }
106            else                          // success
107            {
108                remote_mutex_destroy( mutex_xp ); 
109            }
110            break;
111        }
112        ////////////////
113            case MUTEX_LOCK:
114        {
115            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
116
117            if( mutex_xp == XPTR_NULL )     // user error
118            {
119
120#if DEBUG_SYSCALLS_ERROR
121printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
122__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
123#endif
124                this->errno = EINVAL;
125                return -1;
126            }
127            else                          // success
128            {
129                remote_mutex_lock( mutex_xp ); 
130            }
131            break;
132        }
133        //////////////////
134            case MUTEX_UNLOCK:
135        {
136            xptr_t mutex_xp = remote_mutex_from_ident( (intptr_t)vaddr );
137
138            if( mutex_xp == XPTR_NULL )     // user error
139            {
140
141#if DEBUG_SYSCALLS_ERROR
142printk("\n[ERROR] in %s : mutex %x not registered / thread %x / process %x\n",
143__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
144#endif
145                this->errno = EINVAL;
146                return -1;
147            }
148            else                          // success
149            {
150                remote_mutex_unlock( mutex_xp ); 
151            }
152            break;
153        }
154        ////////
155            default:
156        {
157            printk("\n[PANIC] in %s : illegal operation type\n", __FUNCTION__ );
158                    hal_core_sleep();
159        }
160        }
161
162        return 0;
163
164}  // end sys_mutex()
165
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