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d614a753 | 1 | /* Copyright (C) 2000-2020 Free Software Foundation, Inc. |
76a50749 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Kaz Kylheku <kaz@ashi.footprints.net>. | |
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 License as | |
7 | published by the Free Software Foundation; either version 2.1 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 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; see the file COPYING.LIB. If |
5a82c748 | 17 | not, see <https://www.gnu.org/licenses/>. */ |
76a50749 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <signal.h> | |
21 | #include <pthread.h> | |
22 | #include <time.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | #include "posix-timer.h" | |
26 | ||
27 | ||
28 | /* Create new per-process timer using CLOCK. */ | |
29 | int | |
bd2260a2 | 30 | timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid) |
76a50749 UD |
31 | { |
32 | int retval = -1; | |
33 | struct timer_node *newtimer = NULL; | |
34 | struct thread_node *thread = NULL; | |
35 | ||
5324b81c | 36 | if (0 |
2c03b6db | 37 | #if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0 |
5324b81c | 38 | || clock_id == CLOCK_PROCESS_CPUTIME_ID |
76a50749 | 39 | #endif |
2c03b6db | 40 | #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0 |
5324b81c | 41 | || clock_id == CLOCK_THREAD_CPUTIME_ID |
76a50749 UD |
42 | #endif |
43 | ) | |
5324b81c UD |
44 | { |
45 | /* We don't allow timers for CPU clocks. At least not in the | |
46 | moment. */ | |
47 | __set_errno (ENOTSUP); | |
48 | return -1; | |
49 | } | |
50 | ||
51 | if (clock_id != CLOCK_REALTIME) | |
76a50749 UD |
52 | { |
53 | __set_errno (EINVAL); | |
54 | return -1; | |
55 | } | |
56 | ||
57 | pthread_once (&__timer_init_once_control, __timer_init_once); | |
58 | ||
59 | if (__timer_init_failed) | |
60 | { | |
61 | __set_errno (ENOMEM); | |
62 | return -1; | |
63 | } | |
64 | ||
65 | pthread_mutex_lock (&__timer_mutex); | |
66 | ||
67 | newtimer = __timer_alloc (); | |
a1ffb40e | 68 | if (__glibc_unlikely (newtimer == NULL)) |
76a50749 UD |
69 | { |
70 | __set_errno (EAGAIN); | |
71 | goto unlock_bail; | |
72 | } | |
73 | ||
74 | if (evp != NULL) | |
75 | newtimer->event = *evp; | |
76 | else | |
77 | { | |
78 | newtimer->event.sigev_notify = SIGEV_SIGNAL; | |
79 | newtimer->event.sigev_signo = SIGALRM; | |
61a3a8c6 | 80 | newtimer->event.sigev_value.sival_ptr = newtimer; |
76a50749 UD |
81 | newtimer->event.sigev_notify_function = 0; |
82 | } | |
83 | ||
84 | newtimer->event.sigev_notify_attributes = &newtimer->attr; | |
85 | newtimer->creator_pid = getpid (); | |
86 | ||
87 | switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL)) | |
88 | { | |
89 | case SIGEV_NONE: | |
76a50749 UD |
90 | case SIGEV_SIGNAL: |
91 | /* We have a global thread for delivering timed signals. | |
92 | If it is not running, try to start it up. */ | |
bf7c04cd | 93 | thread = &__timer_signal_thread_rclk; |
76a50749 UD |
94 | if (! thread->exists) |
95 | { | |
96 | if (__builtin_expect (__timer_thread_start (thread), | |
97 | 1) < 0) | |
98 | { | |
99 | __set_errno (EAGAIN); | |
100 | goto unlock_bail; | |
101 | } | |
102 | } | |
103 | break; | |
104 | ||
105 | case SIGEV_THREAD: | |
106 | /* Copy over thread attributes or set up default ones. */ | |
107 | if (evp->sigev_notify_attributes) | |
108 | newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes; | |
109 | else | |
110 | pthread_attr_init (&newtimer->attr); | |
111 | ||
112 | /* Ensure thread attributes call for deatched thread. */ | |
113 | pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED); | |
114 | ||
115 | /* Try to find existing thread having the right attributes. */ | |
116 | thread = __timer_thread_find_matching (&newtimer->attr, clock_id); | |
117 | ||
118 | /* If no existing thread has these attributes, try to allocate one. */ | |
119 | if (thread == NULL) | |
120 | thread = __timer_thread_alloc (&newtimer->attr, clock_id); | |
121 | ||
122 | /* Out of luck; no threads are available. */ | |
a1ffb40e | 123 | if (__glibc_unlikely (thread == NULL)) |
76a50749 UD |
124 | { |
125 | __set_errno (EAGAIN); | |
126 | goto unlock_bail; | |
127 | } | |
128 | ||
129 | /* If the thread is not running already, try to start it. */ | |
130 | if (! thread->exists | |
131 | && __builtin_expect (! __timer_thread_start (thread), 0)) | |
132 | { | |
133 | __set_errno (EAGAIN); | |
134 | goto unlock_bail; | |
135 | } | |
136 | break; | |
137 | ||
138 | default: | |
139 | __set_errno (EINVAL); | |
140 | goto unlock_bail; | |
141 | } | |
142 | ||
143 | newtimer->clock = clock_id; | |
144 | newtimer->abstime = 0; | |
145 | newtimer->armed = 0; | |
146 | newtimer->thread = thread; | |
147 | ||
148 | *timerid = timer_ptr2id (newtimer); | |
149 | retval = 0; | |
150 | ||
151 | if (__builtin_expect (retval, 0) == -1) | |
152 | { | |
153 | unlock_bail: | |
154 | if (thread != NULL) | |
155 | __timer_thread_dealloc (thread); | |
156 | if (newtimer != NULL) | |
a7f6c66e RM |
157 | { |
158 | timer_delref (newtimer); | |
159 | __timer_dealloc (newtimer); | |
160 | } | |
76a50749 UD |
161 | } |
162 | ||
163 | pthread_mutex_unlock (&__timer_mutex); | |
164 | ||
165 | return retval; | |
166 | } |