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6d7e8eda | 1 | /* Copyright (C) 2000-2023 Free Software Foundation, Inc. |
be1dd949 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
daa3fc9b FW |
5 | modify it under the terms of the GNU Lesser General Public License as |
6 | published by the Free Software Foundation; either version 2.1 of the | |
7 | License, or (at your option) any later version. | |
be1dd949 UD |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
be1dd949 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
daa3fc9b FW |
15 | License along with the GNU C Library; see the file COPYING.LIB. If |
16 | not, see <https://www.gnu.org/licenses/>. */ | |
be1dd949 UD |
17 | |
18 | #include <errno.h> | |
daa3fc9b FW |
19 | #include <signal.h> |
20 | #include <pthread.h> | |
be1dd949 | 21 | #include <time.h> |
daa3fc9b FW |
22 | #include <unistd.h> |
23 | ||
24 | #include "posix-timer.h" | |
25 | ||
be1dd949 UD |
26 | |
27 | /* Create new per-process timer using CLOCK. */ | |
28 | int | |
29 | timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid) | |
30 | { | |
daa3fc9b FW |
31 | int retval = -1; |
32 | struct timer_node *newtimer = NULL; | |
33 | struct thread_node *thread = NULL; | |
34 | ||
35 | if (0 | |
36 | #if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0 | |
37 | || clock_id == CLOCK_PROCESS_CPUTIME_ID | |
38 | #endif | |
39 | #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0 | |
40 | || clock_id == CLOCK_THREAD_CPUTIME_ID | |
41 | #endif | |
42 | ) | |
43 | { | |
44 | /* We don't allow timers for CPU clocks. At least not in the | |
45 | moment. */ | |
46 | __set_errno (ENOTSUP); | |
47 | return -1; | |
48 | } | |
49 | ||
50 | if (clock_id != CLOCK_REALTIME) | |
51 | { | |
52 | __set_errno (EINVAL); | |
53 | return -1; | |
54 | } | |
55 | ||
56 | pthread_once (&__timer_init_once_control, __timer_init_once); | |
57 | ||
58 | if (__timer_init_failed) | |
59 | { | |
60 | __set_errno (ENOMEM); | |
61 | return -1; | |
62 | } | |
63 | ||
64 | pthread_mutex_lock (&__timer_mutex); | |
65 | ||
66 | newtimer = __timer_alloc (); | |
67 | if (__glibc_unlikely (newtimer == NULL)) | |
68 | { | |
69 | __set_errno (EAGAIN); | |
70 | goto unlock_bail; | |
71 | } | |
72 | ||
73 | if (evp != NULL) | |
74 | newtimer->event = *evp; | |
75 | else | |
76 | { | |
77 | newtimer->event.sigev_notify = SIGEV_SIGNAL; | |
78 | newtimer->event.sigev_signo = SIGALRM; | |
79 | newtimer->event.sigev_value.sival_ptr = newtimer; | |
80 | newtimer->event.sigev_notify_function = 0; | |
81 | } | |
82 | ||
83 | newtimer->event.sigev_notify_attributes = &newtimer->attr; | |
84 | newtimer->creator_pid = getpid (); | |
85 | ||
86 | switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL)) | |
87 | { | |
88 | case SIGEV_NONE: | |
89 | case SIGEV_SIGNAL: | |
90 | /* We have a global thread for delivering timed signals. | |
91 | If it is not running, try to start it up. */ | |
92 | thread = &__timer_signal_thread_rclk; | |
93 | if (! thread->exists) | |
94 | { | |
95 | if (__builtin_expect (__timer_thread_start (thread), | |
96 | 1) < 0) | |
97 | { | |
98 | __set_errno (EAGAIN); | |
99 | goto unlock_bail; | |
100 | } | |
101 | } | |
102 | break; | |
103 | ||
104 | case SIGEV_THREAD: | |
105 | /* Copy over thread attributes or set up default ones. */ | |
106 | if (evp->sigev_notify_attributes) | |
107 | newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes; | |
108 | else | |
109 | pthread_attr_init (&newtimer->attr); | |
110 | ||
111 | /* Ensure thread attributes call for deatched thread. */ | |
112 | pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED); | |
113 | ||
114 | /* Try to find existing thread having the right attributes. */ | |
115 | thread = __timer_thread_find_matching (&newtimer->attr, clock_id); | |
116 | ||
117 | /* If no existing thread has these attributes, try to allocate one. */ | |
118 | if (thread == NULL) | |
119 | thread = __timer_thread_alloc (&newtimer->attr, clock_id); | |
120 | ||
121 | /* Out of luck; no threads are available. */ | |
122 | if (__glibc_unlikely (thread == NULL)) | |
123 | { | |
124 | __set_errno (EAGAIN); | |
125 | goto unlock_bail; | |
126 | } | |
127 | ||
128 | /* If the thread is not running already, try to start it. */ | |
129 | if (! thread->exists | |
130 | && __builtin_expect (! __timer_thread_start (thread), 0)) | |
131 | { | |
132 | __set_errno (EAGAIN); | |
133 | goto unlock_bail; | |
134 | } | |
135 | break; | |
136 | ||
137 | default: | |
138 | __set_errno (EINVAL); | |
139 | goto unlock_bail; | |
140 | } | |
141 | ||
142 | newtimer->clock = clock_id; | |
143 | newtimer->abstime = 0; | |
144 | newtimer->armed = 0; | |
145 | newtimer->thread = thread; | |
146 | ||
147 | *timerid = timer_ptr2id (newtimer); | |
148 | retval = 0; | |
149 | ||
150 | if (__builtin_expect (retval, 0) == -1) | |
151 | { | |
152 | unlock_bail: | |
153 | if (thread != NULL) | |
154 | __timer_thread_dealloc (thread); | |
155 | if (newtimer != NULL) | |
156 | { | |
157 | timer_delref (newtimer); | |
158 | __timer_dealloc (newtimer); | |
159 | } | |
160 | } | |
161 | ||
162 | pthread_mutex_unlock (&__timer_mutex); | |
163 | ||
164 | return retval; | |
be1dd949 | 165 | } |