14b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes/* 24b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * Copyright (C) 2008 The Android Open Source Project 34b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * All rights reserved. 44b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * 54b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * Redistribution and use in source and binary forms, with or without 64b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * modification, are permitted provided that the following conditions 74b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * are met: 84b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * * Redistributions of source code must retain the above copyright 94b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * notice, this list of conditions and the following disclaimer. 104b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * * Redistributions in binary form must reproduce the above copyright 114b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * notice, this list of conditions and the following disclaimer in 124b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * the documentation and/or other materials provided with the 134b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * distribution. 144b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * 154b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 164b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 174b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 184b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 194b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 204b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 214b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 224b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 234b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 244b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 254b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 264b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes * SUCH DAMAGE. 274b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes */ 284b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 294b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include "private/kernel_sigset_t.h" 304b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 314b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include <errno.h> 3205fc1d7050d5451aea08dc5f504d2670287b2d43Elliott Hughes#include <malloc.h> 3395f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui#include <pthread.h> 3495f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui#include <stdatomic.h> 354b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include <stdio.h> 364b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include <string.h> 3795f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui#include <time.h> 384b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 394b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// System calls. 404b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __rt_sigtimedwait(const sigset_t*, siginfo_t*, const struct timespec*, size_t); 414b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_create(clockid_t, sigevent*, __kernel_timer_t*); 424b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_delete(__kernel_timer_t); 434b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_getoverrun(__kernel_timer_t); 444b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_gettime(__kernel_timer_t, itimerspec*); 454b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_settime(__kernel_timer_t, int, const itimerspec*, itimerspec*); 464b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 474b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// Most POSIX timers are handled directly by the kernel. We translate SIGEV_THREAD timers 484b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// into SIGEV_THREAD_ID timers so the kernel handles all the time-related stuff and we just 494b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// need to worry about running user code on a thread. 504b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 514b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// We can't use SIGALRM because too many other C library functions throw that around, and since 524b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// they don't send to a specific thread, all threads are eligible to handle the signal and we can 534b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// end up with one of our POSIX timer threads handling it (meaning that the intended recipient 544b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// doesn't). glibc uses SIGRTMIN for its POSIX timer implementation, so in the absence of any 554b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// reason to use anything else, we use that too. 560990d4fda898ada86e557f872f5cb7d16b138e3cElliott Hughesstatic const int TIMER_SIGNAL = (__SIGRTMIN + 0); 574b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 584b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstruct PosixTimer { 594b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes __kernel_timer_t kernel_timer_id; 604b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 614b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes int sigev_notify; 624b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 6395f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui // The fields below are only needed for a SIGEV_THREAD timer. 644b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_t callback_thread; 654b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes void (*callback)(sigval_t); 664b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigval_t callback_argument; 6795f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui atomic_bool deleted; // Set when the timer is deleted, to prevent further calling of callback. 684b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes}; 694b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 704b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstatic __kernel_timer_t to_kernel_timer_id(timer_t timer) { 714b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return reinterpret_cast<PosixTimer*>(timer)->kernel_timer_id; 724b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 734b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 744b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstatic void* __timer_thread_start(void* arg) { 754b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes PosixTimer* timer = reinterpret_cast<PosixTimer*>(arg); 764b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 774b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes kernel_sigset_t sigset; 784b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigaddset(sigset.get(), TIMER_SIGNAL); 794b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 804b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes while (true) { 814b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Wait for a signal... 824b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes siginfo_t si; 834b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes memset(&si, 0, sizeof(si)); 844b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes int rc = __rt_sigtimedwait(sigset.get(), &si, NULL, sizeof(sigset)); 854b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (rc == -1) { 864b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes continue; 874b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 884b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 8995f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui if (si.si_code == SI_TIMER) { 904b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // This signal was sent because a timer fired, so call the callback. 9195f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui 9295f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui // All events to the callback will be ignored when the timer is deleted. 9395f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui if (atomic_load(&timer->deleted) == true) { 9495f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui continue; 9595f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui } 964b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes timer->callback(timer->callback_argument); 974b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } else if (si.si_code == SI_TKILL) { 984b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // This signal was sent because someone wants us to exit. 99473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1004b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return NULL; 1014b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1024b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1034b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 1044b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1054b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstatic void __timer_thread_stop(PosixTimer* timer) { 10695f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui atomic_store(&timer->deleted, true); 1074b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_kill(timer->callback_thread, TIMER_SIGNAL); 1084b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 1094b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1104b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_create.html 1114b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_create(clockid_t clock_id, sigevent* evp, timer_t* timer_id) { 112473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes PosixTimer* timer = reinterpret_cast<PosixTimer*>(malloc(sizeof(PosixTimer))); 113473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (timer == NULL) { 1144b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1154b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1164b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 117473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes timer->sigev_notify = (evp == NULL) ? SIGEV_SIGNAL : evp->sigev_notify; 1184b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1194b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // If not a SIGEV_THREAD timer, the kernel can handle it without our help. 120473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (timer->sigev_notify != SIGEV_THREAD) { 121473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (__timer_create(clock_id, evp, &timer->kernel_timer_id) == -1) { 122473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1234b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1244b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1254b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 126473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes *timer_id = timer; 1274b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return 0; 1284b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1294b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1304b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Otherwise, this must be SIGEV_THREAD timer... 131473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes timer->callback = evp->sigev_notify_function; 132473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes timer->callback_argument = evp->sigev_value; 13395f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui atomic_init(&timer->deleted, false); 1344b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1354b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Check arguments that the kernel doesn't care about but we do. 136473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (timer->callback == NULL) { 137473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1384b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes errno = EINVAL; 1394b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1404b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1414b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1424b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Create this timer's thread. 1434b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_attr_t thread_attributes; 1444b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (evp->sigev_notify_attributes == NULL) { 1454b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_attr_init(&thread_attributes); 1464b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } else { 1474b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes thread_attributes = *reinterpret_cast<pthread_attr_t*>(evp->sigev_notify_attributes); 1484b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1494b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_attr_setdetachstate(&thread_attributes, PTHREAD_CREATE_DETACHED); 1504b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1514b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // We start the thread with TIMER_SIGNAL blocked by blocking the signal here and letting it 1524b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // inherit. If it tried to block the signal itself, there would be a race. 1534b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes kernel_sigset_t sigset; 1544b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigaddset(sigset.get(), TIMER_SIGNAL); 1554b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes kernel_sigset_t old_sigset; 1564b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_sigmask(SIG_BLOCK, sigset.get(), old_sigset.get()); 1574b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 158473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes int rc = pthread_create(&timer->callback_thread, &thread_attributes, __timer_thread_start, timer); 1594b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1604b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_sigmask(SIG_SETMASK, old_sigset.get(), NULL); 1614b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1624b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (rc != 0) { 163473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1644b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes errno = rc; 1654b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1664b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1674b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1684b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigevent se = *evp; 1694b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes se.sigev_signo = TIMER_SIGNAL; 1704b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes se.sigev_notify = SIGEV_THREAD_ID; 171a4831cb4a3f44b93788488db8ff9ea76613f0355Elliott Hughes se.sigev_notify_thread_id = pthread_gettid_np(timer->callback_thread); 172473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (__timer_create(clock_id, &se, &timer->kernel_timer_id) == -1) { 173473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes __timer_thread_stop(timer); 1744b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1754b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1764b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 177d1aea30b2ade504550f7bb7996c808b9af1c415dElliott Hughes // Give the thread a specific meaningful name. 1784b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // It can't do this itself because the kernel timer isn't created until after it's running. 179d1aea30b2ade504550f7bb7996c808b9af1c415dElliott Hughes char name[16]; // 16 is the kernel-imposed limit. 180d1aea30b2ade504550f7bb7996c808b9af1c415dElliott Hughes snprintf(name, sizeof(name), "POSIX timer %d", to_kernel_timer_id(timer)); 181473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes pthread_setname_np(timer->callback_thread, name); 1824b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 183473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes *timer_id = timer; 1844b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return 0; 1854b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 1864b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1874b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_delete.html 1884b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_delete(timer_t id) { 1894b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes int rc = __timer_delete(to_kernel_timer_id(id)); 1904b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (rc == -1) { 1914b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1924b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1934b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1944b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes PosixTimer* timer = reinterpret_cast<PosixTimer*>(id); 1954b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (timer->sigev_notify == SIGEV_THREAD) { 196473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes // Stopping the timer's thread frees the timer data when it's safe. 1974b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes __timer_thread_stop(timer); 198473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes } else { 199473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes // For timers without threads, we can just free right away. 200473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 2014b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 2024b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 2034b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return 0; 2044b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 2054b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 20695f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_gettime.html 2074b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_gettime(timer_t id, itimerspec* ts) { 2084b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return __timer_gettime(to_kernel_timer_id(id), ts); 2094b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 2104b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 21195f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_settime.html 21295f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui// When using timer_settime to disarm a repeatable SIGEV_THREAD timer with a very small 21395f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui// period (like below 1ms), the kernel may continue to send events to the callback thread 21495f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui// for a few extra times. This behavior is fine because in POSIX standard: The effect of 21595f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui// disarming or resetting a timer with pending expiration notifications is unspecified. 2164b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_settime(timer_t id, int flags, const itimerspec* ts, itimerspec* ots) { 21762d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris PosixTimer* timer= reinterpret_cast<PosixTimer*>(id); 21895f1ee235ae257802a94d7e94d476ea0aaea5cd8Yabin Cui return __timer_settime(timer->kernel_timer_id, flags, ts, ots); 2194b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 2204b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 2214b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_getoverrun.html 2224b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_getoverrun(timer_t id) { 2234b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return __timer_getoverrun(to_kernel_timer_id(id)); 2244b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 225