source: trunk/kernel/syscalls/sys_thread_migrate.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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File size: 2.7 KB
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1/*
2 * kern/sys_thread_migrate.c - calls the scheduler to yield current CPU
3 *
4 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
6 *
7 * This file is part of ALMOS-kernel.
8 *
9 * ALMOS-kernel is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2.0 of the License.
12 *
13 * ALMOS-kernel is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <cpu.h>
24#include <thread.h>
25#include <task.h>
26#include <scheduler.h>
27
28#define MAX_CPU_NR (CONFIG_MAX_CLUSTER_NR * CONFIG_MAX_CPU_PER_CLUSTER_NR)
29
30int sys_thread_migrate(pthread_attr_t *thread_attr)
31{
32        struct thread_s *this;
33        pthread_attr_t attr;
34        uint_t mode;
35        sint_t cpu_gid;
36        error_t err;
37
38        this = current_thread;
39
40        if(thread_attr == NULL)
41        {
42                err = EINVAL;
43                goto fail_inval;
44        }
45
46        if(NOT_IN_USPACE((uint_t)thread_attr))
47        {
48                err = EPERM;
49                goto fail_access;
50        }
51
52        if((err = cpu_copy_from_uspace(&attr, thread_attr, sizeof(attr))))
53                goto fail_ucopy_attr;
54
55        cpu_gid = (sint_t)cpu_get_id();
56
57        if(attr.cpu_gid == cpu_gid)
58        {
59                thread_migration_disable(this);
60                return 0;
61        }
62
63        if((attr.cpu_gid > 0) && (attr.cpu_gid >= MAX_CPU_NR))
64        {
65                err = EINVAL;
66                goto fail_attr_inval;
67        }
68
69        cpu_gid = (attr.cpu_gid < 0) ? -1 : (attr.cpu_gid % arch_onln_cpu_nr());
70
71        if(attr.flags & PT_ATTR_AUTO_MGRT)
72                this->info.attr.flags |= PT_ATTR_AUTO_MGRT;
73
74#if CONFIG_SHOW_SYSMGRT_MSG
75        printk(INFO, "INFO: %s: pid %d, tid %d (%x), cpu %d: asked to migrate to cpu %d [%u]\n",
76               __FUNCTION__,
77               this->task->pid,
78               this->info.order,
79               this,
80               cpu_get_id(),
81               cpu_gid,
82               cpu_time_stamp());
83#endif
84
85        cpu_disable_all_irq(&mode);
86        thread_clear_cap_migrate(this);
87        cpu_restore_irq(mode);
88
89        err = thread_migrate(this, cpu_gid);
90
91        /* Reload this pointer */
92        this = current_thread;
93
94        cpu_disable_all_irq(&mode);
95        thread_set_cap_migrate(this);
96        thread_migration_deactivate(this);
97        cpu_restore_irq(mode);
98
99#if CONFIG_SHOW_SYSMGRT_MSG
100        printk(INFO, "INFO: %s: pid %d, tid %d (%x), cpu %d, err %d, done [%u]\n", 
101               __FUNCTION__,
102               this->task->pid,
103               this->info.order,
104               current_thread,
105               cpu_get_id(),
106               err,
107               cpu_time_stamp());
108#endif
109
110fail_attr_inval:
111fail_ucopy_attr:
112fail_access:
113fail_inval:
114        this->info.errno = err;
115        return (err) ? -1 : 0;
116}
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