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33574c17 ST |
1 | /* Thread termination. |
2 | Copyright (C) 2000-2018 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 | |
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 | |
17 | <http://www.gnu.org/licenses/>. */ | |
33574c17 ST |
18 | |
19 | #include <assert.h> | |
20 | #include <errno.h> | |
21 | #include <pthread.h> | |
22 | #include <stdlib.h> | |
23 | ||
24 | #include <pt-internal.h> | |
25 | ||
26 | #include <atomic.h> | |
27 | ||
28 | ||
29 | /* Terminate the current thread and make STATUS available to any | |
30 | thread that might join it. */ | |
31 | void | |
32 | __pthread_exit (void *status) | |
33 | { | |
34 | struct __pthread *self = _pthread_self (); | |
35 | struct __pthread_cancelation_handler **handlers; | |
36 | int oldstate; | |
37 | ||
38 | /* Run any cancelation handlers. According to POSIX, the | |
39 | cancellation cleanup handlers should be called with cancellation | |
40 | disabled. */ | |
41 | pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate); | |
42 | ||
43 | for (handlers = __pthread_get_cleanup_stack (); | |
44 | *handlers != NULL; | |
45 | *handlers = (*handlers)->__next) | |
46 | (*handlers)->__handler ((*handlers)->__arg); | |
47 | ||
48 | pthread_setcancelstate (oldstate, &oldstate); | |
49 | ||
50 | /* Decrease the number of threads. We use an atomic operation to | |
51 | make sure that only the last thread calls `exit'. */ | |
52 | if (atomic_decrement_and_test (&__pthread_total)) | |
53 | /* We are the last thread. */ | |
54 | exit (0); | |
55 | ||
56 | /* Note that after this point the process can be terminated at any | |
57 | point if another thread calls `pthread_exit' and happens to be | |
58 | the last thread. */ | |
59 | ||
60 | __pthread_mutex_lock (&self->state_lock); | |
61 | ||
62 | if (self->cancel_state == PTHREAD_CANCEL_ENABLE && self->cancel_pending) | |
63 | status = PTHREAD_CANCELED; | |
64 | ||
65 | switch (self->state) | |
66 | { | |
67 | default: | |
68 | assert (!"Consistency error: unexpected self->state"); | |
69 | abort (); | |
70 | break; | |
71 | ||
72 | case PTHREAD_DETACHED: | |
73 | __pthread_mutex_unlock (&self->state_lock); | |
74 | ||
75 | break; | |
76 | ||
77 | case PTHREAD_JOINABLE: | |
78 | /* We need to stay around for a while since another thread | |
79 | might want to join us. */ | |
80 | self->state = PTHREAD_EXITED; | |
81 | ||
82 | /* We need to remember the exit status. A thread joining us | |
83 | might ask for it. */ | |
84 | self->status = status; | |
85 | ||
86 | /* Broadcast the condition. This will wake up threads that are | |
87 | waiting to join us. */ | |
88 | __pthread_cond_broadcast (&self->state_cond); | |
89 | __pthread_mutex_unlock (&self->state_lock); | |
90 | ||
91 | break; | |
92 | } | |
93 | ||
94 | /* Destroy any thread specific data. */ | |
95 | __pthread_destroy_specific (self); | |
96 | ||
97 | /* Destroy any signal state. */ | |
98 | __pthread_sigstate_destroy (self); | |
99 | ||
100 | /* Self terminating requires TLS, so defer the release of the TCB until | |
101 | the thread structure is reused. */ | |
102 | ||
103 | /* Release kernel resources, including the kernel thread and the stack, | |
104 | and drop the self reference. */ | |
105 | __pthread_thread_terminate (self); | |
106 | ||
107 | /* NOTREACHED */ | |
108 | abort (); | |
109 | } | |
110 | ||
111 | strong_alias (__pthread_exit, pthread_exit); |