1 /*- 2 * See the file LICENSE for redistribution information. 3 * 4 * Copyright (c) 1997, 1998 5 * Sleepycat Software. All rights reserved. 6 */ 7 8 #include "config.h" 9 10 #ifndef lint 11 static const char sccsid[] = "@(#)os_sleep.c 10.12 (Sleepycat) 10/12/98"; 12 #endif /* not lint */ 13 14 #ifndef NO_SYSTEM_INCLUDES 15 #include <sys/types.h> 16 #ifdef HAVE_SYS_TIME_H 17 #include <sys/time.h> 18 #endif 19 #ifdef HAVE_SYS_SELECT_H 20 #include <sys/select.h> 21 #endif 22 23 #include <errno.h> 24 #ifndef HAVE_SYS_TIME_H 25 #include <time.h> 26 #endif 27 #include <unistd.h> 28 #endif 29 30 #include "db_int.h" 31 #include "os_jump.h" 32 33 /* 34 * __os_sleep -- 35 * Yield the processor for a period of time. 36 * 37 * PUBLIC: int __os_sleep __P((u_long, u_long)); 38 */ 39 int 40 __os_sleep(secs, usecs) 41 u_long secs, usecs; /* Seconds and microseconds. */ 42 { 43 struct timeval t; 44 45 /* Don't require that the values be normalized. */ 46 for (; usecs >= 1000000; ++secs, usecs -= 1000000) 47 ; 48 49 if (__db_jump.j_sleep != NULL) 50 return (__db_jump.j_sleep(secs, usecs)); 51 52 /* 53 * It's important that we yield the processor here so that other 54 * processes or threads are permitted to run. 55 */ 56 t.tv_sec = secs; 57 t.tv_usec = usecs; 58 return (select(0, NULL, NULL, NULL, &t) == -1 ? errno : 0); 59 } 60