1 /* $NetBSD: tsleep.c,v 1.4 2014/03/21 22:18:57 dholland Exp $ */ 2 3 /*- 4 * Copyright (c) 2010 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND 17 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 23 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 #if !defined(lint) 32 __RCSID("$NetBSD: tsleep.c,v 1.4 2014/03/21 22:18:57 dholland Exp $"); 33 #endif /* !lint */ 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/kthread.h> 38 #include <sys/proc.h> 39 40 #include "kernspace.h" 41 42 #define NTHREADS 10 43 44 /* 45 * mpsafe thread. need dedicated interlock 46 */ 47 static kmutex_t mymtx; 48 49 static void 50 tinythread(void *arg) 51 { 52 static int wakeups; 53 int i, rv; 54 bool relock = ((uintptr_t)arg % 2) == 0; 55 56 for (i = 0; i < 1000; i++) { 57 mutex_enter(&mymtx); 58 wakeup(tinythread); 59 if (wakeups >= NTHREADS-1) { 60 mutex_exit(&mymtx); 61 break; 62 } 63 rv = mtsleep(tinythread, relock ? 0 : PNORELOCK, 64 "haa", 0, &mymtx); 65 if (relock) 66 mutex_exit(&mymtx); 67 if (rv != 0) 68 panic("mtsleep failed"); 69 } 70 71 mutex_enter(&mymtx); 72 wakeups++; 73 wakeup(tinythread); 74 75 rv = mtsleep(rumptest_tsleep, PNORELOCK, "kepuli", 1, &mymtx); 76 if (rv != EWOULDBLOCK) 77 panic("mtsleep unexpected return value %d", rv); 78 79 kthread_exit(0); 80 } 81 82 void 83 rumptest_tsleep() 84 { 85 struct lwp *notbigl[NTHREADS]; 86 int rv, i; 87 88 mutex_init(&mymtx, MUTEX_DEFAULT, IPL_NONE); 89 90 for (i = 0; i < NTHREADS; i++) { 91 rv = kthread_create(PRI_NONE, KTHREAD_MUSTJOIN| KTHREAD_MPSAFE, 92 NULL, tinythread, (void *)(uintptr_t)i, ¬bigl[i], "nb"); 93 if (rv) 94 panic("thread create failed: %d", rv); 95 } 96 97 for (i = 0; i < NTHREADS; i++) { 98 kthread_join(notbigl[i]); 99 } 100 } 101