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54da5be3 RM |
1 | /* Thread cancellation support. |
2 | Copyright (C) 1995 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 Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | 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 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If | |
17 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
18 | Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <hurd/signal.h> | |
21 | #include <hurd/interrupt.h> | |
22 | #include <assert.h> | |
23 | #include <thread_state.h> | |
24 | ||
25 | ||
26 | /* See hurdsig.c. */ | |
27 | extern mach_port_t _hurdsig_abort_rpcs (struct hurd_sigstate *ss, | |
28 | int signo, int sigthread, | |
29 | struct machine_thread_all_state *, | |
30 | int *state_change, | |
31 | mach_port_t *reply_port, | |
32 | mach_msg_type_name_t reply_port_type, | |
33 | int untraced); | |
34 | ||
35 | error_t | |
36 | hurd_thread_cancel (thread_t thread) | |
37 | { | |
38 | struct hurd_sigstate *ss = _hurd_thread_sigstate (thread); | |
39 | struct machine_thread_all_state state; | |
40 | int state_change; | |
41 | error_t err; | |
42 | ||
43 | if (! ss) | |
44 | return EINVAL; | |
45 | ||
46 | __spin_lock (&ss->lock); | |
47 | assert (! ss->critical_section); | |
48 | ss->critical_section = 1; | |
49 | err = __thread_suspend (thread); | |
50 | __spin_unlock (&ss->lock); | |
51 | ||
52 | if (! err) | |
53 | { | |
54 | /* Set the flag telling the thread its operation is being cancelled. */ | |
55 | ss->cancel = 1; | |
56 | ||
57 | /* Interrupt any interruptible RPC now in progress. */ | |
58 | state.set = 0; | |
59 | _hurdsig_abort_rpcs (ss, 0, 0, &state, &state_change, NULL, 0, 0); | |
60 | if (state_change) | |
61 | err = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR, | |
62 | (natural_t *) &state.basic, | |
63 | MACHINE_THREAD_STATE_COUNT); | |
64 | ||
65 | __thread_resume (thread); | |
66 | } | |
67 | ||
68 | _hurd_critical_section_unlock (ss); | |
69 | return err; | |
70 | } | |
71 | ||
72 | ||
73 | int | |
74 | hurd_check_cancel (void) | |
75 | { | |
76 | struct hurd_sigstate *ss = _hurd_self_sigstate (); | |
77 | int cancel; | |
78 | ||
79 | __spin_lock (&ss->lock); | |
80 | assert (! ss->critical_section); | |
81 | cancel = ss->cancel; | |
82 | ss->cancel = 0; | |
83 | __spin_unlock (&ss->lock); | |
84 | ||
85 | return cancel; | |
86 | } |