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54da5be3 | 1 | /* Thread cancellation support. |
c84142e8 UD |
2 | Copyright (C) 1995, 1996, 1997 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 not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
54da5be3 RM |
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, | |
8f0c527e | 28 | int signo, int sigthread, |
54da5be3 RM |
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; | |
7752137a RM |
45 | if (ss == _hurd_self_sigstate ()) |
46 | return EINTR; /* Bozo. */ | |
54da5be3 | 47 | |
8f0c527e RM |
48 | assert (! __spin_lock_locked (&ss->critical_section_lock)); |
49 | __spin_lock (&ss->critical_section_lock); | |
54da5be3 | 50 | __spin_lock (&ss->lock); |
54da5be3 RM |
51 | err = __thread_suspend (thread); |
52 | __spin_unlock (&ss->lock); | |
53 | ||
54 | if (! err) | |
55 | { | |
56 | /* Set the flag telling the thread its operation is being cancelled. */ | |
57 | ss->cancel = 1; | |
58 | ||
59 | /* Interrupt any interruptible RPC now in progress. */ | |
60 | state.set = 0; | |
61 | _hurdsig_abort_rpcs (ss, 0, 0, &state, &state_change, NULL, 0, 0); | |
8f0c527e | 62 | if (state_change) |
54da5be3 RM |
63 | err = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR, |
64 | (natural_t *) &state.basic, | |
65 | MACHINE_THREAD_STATE_COUNT); | |
66 | ||
3cf595e5 RM |
67 | if (ss->cancel_hook) |
68 | /* The code being cancelled has a special wakeup function. | |
69 | Calling this should make the thread wake up and check the | |
70 | cancellation flag. */ | |
71 | (*ss->cancel_hook) (); | |
72 | ||
54da5be3 RM |
73 | __thread_resume (thread); |
74 | } | |
75 | ||
76 | _hurd_critical_section_unlock (ss); | |
77 | return err; | |
78 | } | |
79 | ||
80 | ||
81 | int | |
82 | hurd_check_cancel (void) | |
83 | { | |
84 | struct hurd_sigstate *ss = _hurd_self_sigstate (); | |
85 | int cancel; | |
86 | ||
87 | __spin_lock (&ss->lock); | |
8f0c527e | 88 | assert (! __spin_lock_locked (&ss->critical_section_lock)); |
54da5be3 RM |
89 | cancel = ss->cancel; |
90 | ss->cancel = 0; | |
91 | __spin_unlock (&ss->lock); | |
92 | ||
93 | return cancel; | |
94 | } |