source: trunk/kernel/syscalls/sys_barrier.c @ 581

Last change on this file since 581 was 581, checked in by alain, 2 years ago

1) Improve the busylock debug infrastructure.
2) introduce a non-distributed, but portable implementation for the pthread_barrier.

File size: 4.5 KB
Line 
1/*
2 * sys_barrier.c - Access a POSIX barrier.
3 *
4 * authors       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_barrier.h>
32
33#if DEBUG_SYS_BARRIER
34//////////////////////////////////////////////////////
35static char * sys_barrier_op_str( uint32_t operation )
36{
37        if     ( operation == BARRIER_INIT    ) return "INIT";
38        else if( operation == BARRIER_DESTROY ) return "DESTROY";
39        else if( operation == BARRIER_WAIT    ) return "WAIT";
40        else                                    return "undefined";
41}
42#endif
43
44//////////////////////////////////
45int sys_barrier( void     * vaddr,
46                 uint32_t   operation,
47                 uint32_t   count )
48{
49        error_t      error;
50    vseg_t     * vseg;
51 
52    thread_t   * this    = CURRENT_THREAD;
53    process_t  * process = this->process;
54
55#if DEBUG_SYS_BARRIER
56uint64_t   tm_start;
57uint64_t   tm_end;
58tm_start = hal_get_cycles();
59if( DEBUG_SYS_BARRIER < tm_start )
60printk("\n[DBG] %s : thread %x in process %x enter for %s / count %d / cycle %d\n",
61__FUNCTION__, this->trdid, process->pid, sys_barrier_op_str(operation), count,
62(uint32_t)tm_start );
63#endif
64
65    // check vaddr in user vspace
66        error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg );
67
68        if( error )
69    {
70
71#if DEBUG_SYSCALLS_ERROR
72printk("\n[ERROR] in %s : unmapped barrier %x / thread %x / process %x\n",
73__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
74vmm_display( process , false );
75#endif
76        this->errno = error;
77        return -1;
78    }
79
80    // execute requested operation
81        switch( operation )
82        {
83        //////////////////
84            case BARRIER_INIT:
85        {
86            error = remote_barrier_create( (intptr_t)vaddr , count );
87   
88                    if( error )
89            {
90
91#if DEBUG_SYSCALLS_ERROR
92printk("\n[ERROR] in %s : cannot create barrier %x / thread %x / process %x\n",
93__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
94#endif
95                this->errno = error;
96                return -1;
97            }
98                        break;
99        }
100        //////////////////
101            case BARRIER_WAIT:
102        {
103            xptr_t barrier_xp = remote_barrier_from_ident( (intptr_t)vaddr );
104
105            if( barrier_xp == XPTR_NULL )     // user error
106            {
107
108#if DEBUG_SYSCALLS_ERROR
109printk("\n[ERROR] in %s : barrier %x not registered / thread %x / process %x\n",
110__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
111#endif
112                this->errno = EINVAL;
113                return -1;
114            }
115            else                          // success
116            {
117                remote_barrier_wait( barrier_xp ); 
118            }
119            break;
120        }
121        /////////////////////
122            case BARRIER_DESTROY:
123        {
124            xptr_t barrier_xp = remote_barrier_from_ident( (intptr_t)vaddr );
125
126            if( barrier_xp == XPTR_NULL )     // user error
127            {
128
129#if DEBUG_SYSCALLS_ERROR
130printk("\n[ERROR] in %s : barrier %x not registered / thread %x / process %x\n",
131__FUNCTION__ , (intptr_t)vaddr , this->trdid , process->pid );
132#endif
133                this->errno = EINVAL;
134                return -1;
135            }
136            else                          // success
137            {
138                remote_barrier_destroy( barrier_xp ); 
139            }
140            break;
141        }
142        ////////
143        default: {
144            assert ( false, "illegal operation type <%x>", operation );
145        }
146        }  // end switch
147
148#if DEBUG_SYS_BARRIER
149tm_end = hal_get_cycles();
150if( DEBUG_SYS_BARRIER < tm_end )
151printk("\n[DBG] %s : thread %x in process %x exit for %s / cost %d / cycle %d\n",
152__FUNCTION__, this->trdid, process->pid, sys_barrier_op_str(operation), 
153(uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
154#endif
155
156        return 0;
157
158}  // end sys_barrier()
159
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