1 /* Deallocate the kernel thread resources. Mach version.
2 Copyright (C) 2000-2021 Free Software Foundation, Inc.
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
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.
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
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <assert.h>
20 #include <errno.h>
21 #include <mach.h>
22
23 #include <mach/mig_support.h>
24
25 #include <pt-internal.h>
26
27 /* Terminate the kernel thread associated with THREAD, and deallocate its
28 right reference and its stack. The function also drops a reference
29 on THREAD. */
30 void
__pthread_thread_terminate(struct __pthread * thread)31 __pthread_thread_terminate (struct __pthread *thread)
32 {
33 thread_t kernel_thread, self_ktid;
34 mach_port_t wakeup_port, reply_port;
35 void *stackaddr;
36 size_t stacksize;
37 error_t err;
38
39 kernel_thread = thread->kernel_thread;
40
41 if (thread->stack)
42 {
43 stackaddr = thread->stackaddr;
44 stacksize = ((thread->guardsize + __vm_page_size - 1)
45 / __vm_page_size) * __vm_page_size + thread->stacksize;
46 }
47 else
48 {
49 stackaddr = NULL;
50 stacksize = 0;
51 }
52
53 wakeup_port = thread->wakeupmsg.msgh_remote_port;
54
55 /* Each thread has its own reply port, allocated from MiG stub code calling
56 __mig_get_reply_port. Destroying it is a bit tricky because the calls
57 involved are also RPCs, causing the creation of a new reply port if
58 currently null. The __thread_terminate_release call is actually a one way
59 simple routine designed not to require a reply port. */
60 self_ktid = __mach_thread_self ();
61 reply_port = (self_ktid == kernel_thread)
62 ? __mig_get_reply_port () : MACH_PORT_NULL;
63 __mach_port_deallocate (__mach_task_self (), self_ktid);
64
65 /* Finally done with the thread structure. */
66 __pthread_dealloc (thread);
67
68 /* The wake up port is now no longer needed. */
69 __mach_port_destroy (__mach_task_self (), wakeup_port);
70
71 /* Terminate and release all that's left. */
72 err = __thread_terminate_release (kernel_thread, mach_task_self (),
73 kernel_thread, reply_port,
74 (vm_address_t) stackaddr, stacksize);
75
76 /* The kernel does not support it yet. Leak but at least terminate
77 correctly. */
78 err = __thread_terminate (kernel_thread);
79
80 /* We are out of luck. */
81 assert_perror (err);
82 }
83