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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | /* Copyright (C) 2000, 2003, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Kaz Kylheku <kaz@ashi.footprints.net>. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <signal.h> #include <pthread.h> #include <time.h> #include <unistd.h> #include "posix-timer.h" /* Create new per-process timer using CLOCK. */ int timer_create (clock_id, evp, timerid) clockid_t clock_id; struct sigevent *evp; timer_t *timerid; { int retval = -1; struct timer_node *newtimer = NULL; struct thread_node *thread = NULL; if (0 #ifdef _POSIX_CPUTIME || clock_id == CLOCK_PROCESS_CPUTIME_ID #endif #ifdef _POSIX_THREAD_CPUTIME || clock_id == CLOCK_THREAD_CPUTIME_ID #endif ) { /* We don't allow timers for CPU clocks. At least not in the moment. */ __set_errno (ENOTSUP); return -1; } if (clock_id != CLOCK_REALTIME) { __set_errno (EINVAL); return -1; } pthread_once (&__timer_init_once_control, __timer_init_once); if (__timer_init_failed) { __set_errno (ENOMEM); return -1; } pthread_mutex_lock (&__timer_mutex); newtimer = __timer_alloc (); if (__builtin_expect (newtimer == NULL, 0)) { __set_errno (EAGAIN); goto unlock_bail; } if (evp != NULL) newtimer->event = *evp; else { newtimer->event.sigev_notify = SIGEV_SIGNAL; newtimer->event.sigev_signo = SIGALRM; newtimer->event.sigev_value.sival_int = timer_ptr2id (newtimer); newtimer->event.sigev_notify_function = 0; } newtimer->event.sigev_notify_attributes = &newtimer->attr; newtimer->creator_pid = getpid (); switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL)) { case SIGEV_NONE: case SIGEV_SIGNAL: /* We have a global thread for delivering timed signals. If it is not running, try to start it up. */ thread = &__timer_signal_thread_rclk; if (! thread->exists) { if (__builtin_expect (__timer_thread_start (thread), 1) < 0) { __set_errno (EAGAIN); goto unlock_bail; } } break; case SIGEV_THREAD: /* Copy over thread attributes or set up default ones. */ if (evp->sigev_notify_attributes) newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes; else pthread_attr_init (&newtimer->attr); /* Ensure thread attributes call for deatched thread. */ pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED); /* Try to find existing thread having the right attributes. */ thread = __timer_thread_find_matching (&newtimer->attr, clock_id); /* If no existing thread has these attributes, try to allocate one. */ if (thread == NULL) thread = __timer_thread_alloc (&newtimer->attr, clock_id); /* Out of luck; no threads are available. */ if (__builtin_expect (thread == NULL, 0)) { __set_errno (EAGAIN); goto unlock_bail; } /* If the thread is not running already, try to start it. */ if (! thread->exists && __builtin_expect (! __timer_thread_start (thread), 0)) { __set_errno (EAGAIN); goto unlock_bail; } break; default: __set_errno (EINVAL); goto unlock_bail; } newtimer->clock = clock_id; newtimer->abstime = 0; newtimer->armed = 0; newtimer->thread = thread; *timerid = timer_ptr2id (newtimer); retval = 0; if (__builtin_expect (retval, 0) == -1) { unlock_bail: if (thread != NULL) __timer_thread_dealloc (thread); if (newtimer != NULL) { timer_delref (newtimer); __timer_dealloc (newtimer); } } pthread_mutex_unlock (&__timer_mutex); return retval; } |