1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* Start thread. Mach version.
Copyright (C) 2000, 2002, 2005, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <mach.h>
#include <pt-internal.h>
/* Prepare a wakeup message. */
static error_t
create_wakeupmsg (struct __pthread *thread)
{
kern_return_t err;
/* Build wakeup message. */
thread->wakeupmsg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND, 0);
thread->wakeupmsg.msgh_size = 0;
err = __mach_port_allocate (__mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
&thread->wakeupmsg.msgh_remote_port);
if (err)
return EAGAIN;
thread->wakeupmsg.msgh_local_port = MACH_PORT_NULL;
thread->wakeupmsg.msgh_seqno = 0;
thread->wakeupmsg.msgh_id = 0;
err = __mach_port_insert_right (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port,
thread->wakeupmsg.msgh_remote_port,
MACH_MSG_TYPE_MAKE_SEND);
if (err)
{
__mach_port_destroy (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port);
return EAGAIN;
}
/* No need to queue more than one wakeup message on this port. */
mach_port_set_qlimit (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port, 1);
return 0;
}
/* Allocate any resouces for THREAD. The new kernel thread should not
be eligible to be scheduled. */
int
__pthread_thread_alloc (struct __pthread *thread)
{
static int do_create;
error_t err;
err = create_wakeupmsg (thread);
if (err)
return err;
if (! do_create)
{
assert (__pthread_total == 0);
thread->kernel_thread = __mach_thread_self ();
do_create = 1;
}
else
{
err = __thread_create (__mach_task_self (), &thread->kernel_thread);
if (err)
{
__mach_port_destroy (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port);
return EAGAIN;
}
}
return 0;
}
|
