1 /* $NetBSD: sched.h,v 1.15 2020/07/03 16:23:02 maxv Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_SCHED_H_ 33 #define _LINUX_SCHED_H_ 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/proc.h> 38 39 #include <asm/param.h> 40 #include <asm/barrier.h> 41 #include <asm/processor.h> 42 #include <linux/errno.h> 43 44 #define TASK_COMM_LEN MAXCOMLEN 45 46 #define MAX_SCHEDULE_TIMEOUT (INT_MAX/2) /* paranoia */ 47 48 #define current curproc 49 50 static inline pid_t 51 task_pid_nr(struct proc *p) 52 { 53 return p->p_pid; 54 } 55 56 static inline long 57 schedule_timeout_uninterruptible(long timeout) 58 { 59 long remain; 60 int start, end; 61 62 if (cold) { 63 unsigned us; 64 if (hz <= 1000) { 65 unsigned ms = hztoms(MIN((unsigned long)timeout, 66 mstohz(INT_MAX))); 67 us = MIN(ms, INT_MAX/1000)*1000; 68 } else if (hz <= 1000000) { 69 us = MIN(timeout, (INT_MAX/1000000)/hz)*hz*1000000; 70 } else { 71 us = timeout/(1000000/hz); 72 } 73 DELAY(us); 74 return 0; 75 } 76 77 start = getticks(); 78 /* Caller is expected to loop anyway, so no harm in truncating. */ 79 (void)kpause("loonix", false /*!intr*/, MIN(timeout, INT_MAX), NULL); 80 end = getticks(); 81 82 remain = timeout - (end - start); 83 return remain > 0 ? remain : 0; 84 } 85 86 static inline void 87 cond_resched(void) 88 { 89 90 preempt_point(); 91 } 92 93 #endif /* _LINUX_SCHED_H_ */ 94