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33574c17 | 1 | /* Start thread. Mach version. |
2b778ceb | 2 | Copyright (C) 2000-2021 Free Software Foundation, Inc. |
33574c17 ST |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
ad2b41bf ST |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
33574c17 ST |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
ad2b41bf | 13 | Lesser General Public License for more details. |
33574c17 | 14 | |
ad2b41bf ST |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
33574c17 ST |
18 | |
19 | #include <assert.h> | |
20 | #include <errno.h> | |
21 | #include <string.h> | |
22 | ||
23 | #include <mach.h> | |
24 | ||
25 | #include <pt-internal.h> | |
26 | ||
27 | /* Prepare a wakeup message. */ | |
28 | static error_t | |
29 | create_wakeupmsg (struct __pthread *thread) | |
30 | { | |
31 | kern_return_t err; | |
32 | ||
33 | /* Build wakeup message. */ | |
34 | thread->wakeupmsg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND, 0); | |
35 | thread->wakeupmsg.msgh_size = 0; | |
36 | ||
37 | err = __mach_port_allocate (__mach_task_self (), MACH_PORT_RIGHT_RECEIVE, | |
38 | &thread->wakeupmsg.msgh_remote_port); | |
39 | if (err) | |
40 | return EAGAIN; | |
41 | ||
42 | thread->wakeupmsg.msgh_local_port = MACH_PORT_NULL; | |
43 | thread->wakeupmsg.msgh_seqno = 0; | |
44 | thread->wakeupmsg.msgh_id = 0; | |
45 | ||
46 | err = __mach_port_insert_right (__mach_task_self (), | |
47 | thread->wakeupmsg.msgh_remote_port, | |
48 | thread->wakeupmsg.msgh_remote_port, | |
49 | MACH_MSG_TYPE_MAKE_SEND); | |
50 | if (err) | |
51 | { | |
52 | __mach_port_destroy (__mach_task_self (), | |
53 | thread->wakeupmsg.msgh_remote_port); | |
54 | return EAGAIN; | |
55 | } | |
56 | ||
57 | /* No need to queue more than one wakeup message on this port. */ | |
58 | __mach_port_set_qlimit (__mach_task_self (), | |
59 | thread->wakeupmsg.msgh_remote_port, 1); | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | /* Allocate any resouces for THREAD. The new kernel thread should not | |
65 | be eligible to be scheduled. */ | |
66 | int | |
67 | __pthread_thread_alloc (struct __pthread *thread) | |
68 | { | |
69 | static int do_create; | |
70 | error_t err; | |
71 | ||
72 | err = create_wakeupmsg (thread); | |
73 | if (err) | |
74 | return err; | |
75 | ||
76 | if (!do_create) | |
77 | { | |
78 | assert (__pthread_total == 0); | |
79 | thread->kernel_thread = __mach_thread_self (); | |
80 | do_create = 1; | |
81 | } | |
82 | else | |
83 | { | |
84 | err = __thread_create (__mach_task_self (), &thread->kernel_thread); | |
85 | if (err) | |
86 | { | |
87 | __mach_port_destroy (__mach_task_self (), | |
88 | thread->wakeupmsg.msgh_remote_port); | |
89 | return EAGAIN; | |
90 | } | |
91 | } | |
92 | ||
93 | return 0; | |
94 | } |