1/* 2 * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 15 unchanged lines hidden (view full) --- 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * |
32 * $FreeBSD: head/lib/libthr/thread/thr_getschedparam.c 160287 2006-07-12 06:13:18Z davidxu $ |
33 */ 34 35#include "namespace.h" 36#include <errno.h> 37#include <pthread.h> 38#include "un-namespace.h" 39 40#include "thr_private.h" 41 42__weak_reference(_pthread_getschedparam, pthread_getschedparam); 43 44int 45_pthread_getschedparam(pthread_t pthread, int *policy, 46 struct sched_param *param) 47{ 48 struct pthread *curthread = _get_curthread(); |
49 int ret; |
50 |
51 if (policy == NULL || param == NULL) 52 return (EINVAL); 53 54 if (pthread == curthread) { |
55 /* 56 * Avoid searching the thread list when it is the current 57 * thread. 58 */ |
59 THR_LOCK(curthread); 60 61 /* 62 * XXX Here we need two separated syscalls, atomic is only 63 * guaranteed in thread library, a new syscall is needed. 64 */ 65 66 *policy = sched_getscheduler((pid_t)curthread->tid); 67 if (*policy == -1) 68 ret = errno; 69 else { 70 ret = sched_getparam((pid_t)curthread->tid, param); 71 if (ret == -1) 72 ret = errno; 73 } 74 THR_UNLOCK(curthread); |
75 } 76 /* Find the thread in the list of active threads. */ 77 else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0)) 78 == 0) { 79 THR_THREAD_LOCK(curthread, pthread); |
80 *policy = sched_getscheduler((pid_t)pthread->tid); 81 if (*policy == -1) 82 ret = errno; 83 else { 84 ret = sched_getparam((pid_t)pthread->tid, param); 85 if (ret == -1) 86 ret = errno; 87 } |
88 THR_THREAD_UNLOCK(curthread, pthread); 89 _thr_ref_delete(curthread, pthread); |
90 } 91 return (ret); 92} |