posix_timers.cpp revision 05fc1d7050d5451aea08dc5f504d2670287b2d43
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 "pthread_internal.h" 304b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include "private/bionic_futex.h" 314b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include "private/kernel_sigset_t.h" 324b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 334b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include <errno.h> 3405fc1d7050d5451aea08dc5f504d2670287b2d43Elliott Hughes#include <malloc.h> 354b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include <stdio.h> 364b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes#include <string.h> 374b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 384b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// System calls. 394b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __rt_sigtimedwait(const sigset_t*, siginfo_t*, const struct timespec*, size_t); 404b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_create(clockid_t, sigevent*, __kernel_timer_t*); 414b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_delete(__kernel_timer_t); 424b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_getoverrun(__kernel_timer_t); 434b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_gettime(__kernel_timer_t, itimerspec*); 444b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesextern "C" int __timer_settime(__kernel_timer_t, int, const itimerspec*, itimerspec*); 454b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 464b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// Most POSIX timers are handled directly by the kernel. We translate SIGEV_THREAD timers 474b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// into SIGEV_THREAD_ID timers so the kernel handles all the time-related stuff and we just 484b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// need to worry about running user code on a thread. 494b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 504b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// We can't use SIGALRM because too many other C library functions throw that around, and since 514b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// they don't send to a specific thread, all threads are eligible to handle the signal and we can 524b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// end up with one of our POSIX timer threads handling it (meaning that the intended recipient 534b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// doesn't). glibc uses SIGRTMIN for its POSIX timer implementation, so in the absence of any 544b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// reason to use anything else, we use that too. 550990d4fda898ada86e557f872f5cb7d16b138e3cElliott Hughesstatic const int TIMER_SIGNAL = (__SIGRTMIN + 0); 564b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 574b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstruct PosixTimer { 584b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes __kernel_timer_t kernel_timer_id; 594b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 604b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes int sigev_notify; 614b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 624b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // These fields are only needed for a SIGEV_THREAD timer. 634b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_t callback_thread; 644b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes void (*callback)(sigval_t); 654b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigval_t callback_argument; 6662d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris volatile bool armed; 674b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes}; 684b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 694b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstatic __kernel_timer_t to_kernel_timer_id(timer_t timer) { 704b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return reinterpret_cast<PosixTimer*>(timer)->kernel_timer_id; 714b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 724b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 734b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstatic void* __timer_thread_start(void* arg) { 744b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes PosixTimer* timer = reinterpret_cast<PosixTimer*>(arg); 754b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 764b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes kernel_sigset_t sigset; 774b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigaddset(sigset.get(), TIMER_SIGNAL); 784b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 794b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes while (true) { 804b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Wait for a signal... 814b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes siginfo_t si; 824b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes memset(&si, 0, sizeof(si)); 834b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes int rc = __rt_sigtimedwait(sigset.get(), &si, NULL, sizeof(sigset)); 844b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (rc == -1) { 854b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes continue; 864b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 874b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 8862d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris if (si.si_code == SI_TIMER && timer->armed) { 894b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // This signal was sent because a timer fired, so call the callback. 904b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes timer->callback(timer->callback_argument); 914b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } else if (si.si_code == SI_TKILL) { 924b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // This signal was sent because someone wants us to exit. 93473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 944b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return NULL; 954b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 964b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 974b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 984b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 994b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesstatic void __timer_thread_stop(PosixTimer* timer) { 10062d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris // Immediately mark the timer as disarmed so even if some events 10162d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris // continue to happen, the callback won't be called. 10262d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris timer->armed = false; 1034b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_kill(timer->callback_thread, TIMER_SIGNAL); 1044b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 1054b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1064b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_create.html 1074b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_create(clockid_t clock_id, sigevent* evp, timer_t* timer_id) { 108473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes PosixTimer* timer = reinterpret_cast<PosixTimer*>(malloc(sizeof(PosixTimer))); 109473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (timer == NULL) { 1104b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1114b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1124b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 113473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes timer->sigev_notify = (evp == NULL) ? SIGEV_SIGNAL : evp->sigev_notify; 1144b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1154b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // If not a SIGEV_THREAD timer, the kernel can handle it without our help. 116473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (timer->sigev_notify != SIGEV_THREAD) { 117473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (__timer_create(clock_id, evp, &timer->kernel_timer_id) == -1) { 118473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1194b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1204b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1214b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 122473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes *timer_id = timer; 1234b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return 0; 1244b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1254b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1264b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Otherwise, this must be SIGEV_THREAD timer... 127473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes timer->callback = evp->sigev_notify_function; 128473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes timer->callback_argument = evp->sigev_value; 12962d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris timer->armed = false; 1304b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1314b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Check arguments that the kernel doesn't care about but we do. 132473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (timer->callback == NULL) { 133473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1344b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes errno = EINVAL; 1354b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1364b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1374b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1384b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Create this timer's thread. 1394b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_attr_t thread_attributes; 1404b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (evp->sigev_notify_attributes == NULL) { 1414b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_attr_init(&thread_attributes); 1424b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } else { 1434b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes thread_attributes = *reinterpret_cast<pthread_attr_t*>(evp->sigev_notify_attributes); 1444b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1454b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_attr_setdetachstate(&thread_attributes, PTHREAD_CREATE_DETACHED); 1464b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1474b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // We start the thread with TIMER_SIGNAL blocked by blocking the signal here and letting it 1484b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // inherit. If it tried to block the signal itself, there would be a race. 1494b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes kernel_sigset_t sigset; 1504b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigaddset(sigset.get(), TIMER_SIGNAL); 1514b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes kernel_sigset_t old_sigset; 1524b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_sigmask(SIG_BLOCK, sigset.get(), old_sigset.get()); 1534b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 154473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes int rc = pthread_create(&timer->callback_thread, &thread_attributes, __timer_thread_start, timer); 1554b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1564b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes pthread_sigmask(SIG_SETMASK, old_sigset.get(), NULL); 1574b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1584b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (rc != 0) { 159473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1604b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes errno = rc; 1614b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1624b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1634b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1644b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes sigevent se = *evp; 1654b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes se.sigev_signo = TIMER_SIGNAL; 1664b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes se.sigev_notify = SIGEV_THREAD_ID; 167a4831cb4a3f44b93788488db8ff9ea76613f0355Elliott Hughes se.sigev_notify_thread_id = pthread_gettid_np(timer->callback_thread); 168473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes if (__timer_create(clock_id, &se, &timer->kernel_timer_id) == -1) { 169473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes __timer_thread_stop(timer); 1704b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1714b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1724b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1734b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // Give the thread a meaningful name. 1744b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes // It can't do this itself because the kernel timer isn't created until after it's running. 1754b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes char name[32]; 176473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes snprintf(name, sizeof(name), "POSIX interval timer %d", to_kernel_timer_id(timer)); 177473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes pthread_setname_np(timer->callback_thread, name); 1784b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 179473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes *timer_id = timer; 1804b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return 0; 1814b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 1824b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1834b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_delete.html 1844b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_delete(timer_t id) { 1854b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes int rc = __timer_delete(to_kernel_timer_id(id)); 1864b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (rc == -1) { 1874b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return -1; 1884b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1894b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1904b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes PosixTimer* timer = reinterpret_cast<PosixTimer*>(id); 1914b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes if (timer->sigev_notify == SIGEV_THREAD) { 192473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes // Stopping the timer's thread frees the timer data when it's safe. 1934b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes __timer_thread_stop(timer); 194473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes } else { 195473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes // For timers without threads, we can just free right away. 196473d06707bccf0dd707905dcbe74ba91c4d1e8a5Elliott Hughes free(timer); 1974b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes } 1984b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 1994b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return 0; 2004b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 2014b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 2024b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_getoverrun.html 2034b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_gettime(timer_t id, itimerspec* ts) { 2044b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return __timer_gettime(to_kernel_timer_id(id), ts); 2054b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 2064b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 2074b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_getoverrun.html 2084b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_settime(timer_t id, int flags, const itimerspec* ts, itimerspec* ots) { 20962d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris PosixTimer* timer= reinterpret_cast<PosixTimer*>(id); 21062d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris int rc = __timer_settime(timer->kernel_timer_id, flags, ts, ots); 21162d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris if (rc == 0) { 21262d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris // Mark the timer as either being armed or disarmed. This avoids the 21362d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris // callback being called after the disarm for SIGEV_THREAD timers only. 21462d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris if (ts->it_value.tv_sec != 0 || ts->it_value.tv_nsec != 0) { 21562d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris timer->armed = true; 21662d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris } else { 21762d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris timer->armed = false; 21862d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris } 21962d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris } 22062d84b19359a8ddd3df5b6293d1b05ef5281f532Christopher Ferris return rc; 2214b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 2224b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes 2234b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes// http://pubs.opengroup.org/onlinepubs/9699919799/functions/timer_getoverrun.html 2244b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughesint timer_getoverrun(timer_t id) { 2254b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes return __timer_getoverrun(to_kernel_timer_id(id)); 2264b558f50a42c97d461f1dede5aaaae490ea99e2eElliott Hughes} 227