diff options
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | manual/resource.texi | 19 | ||||
| -rw-r--r-- | manual/string.texi | 31 | ||||
| -rw-r--r-- | manual/sysinfo.texi | 2 | ||||
| -rw-r--r-- | sysdeps/unix/bsd/times.c | 26 |
5 files changed, 63 insertions, 23 deletions
@@ -1,5 +1,13 @@ 2001-02-10 Mark Kettenis <kettenis@gnu.org> + * sysdeps/unix/bsd/times.c: Reorder includes and add <time.h>. + (timeval_to_clock_t): Add clk_tck argument and use that instead of + CLK_TCK. + (__times): Use __getclktck to get the number of clock ticks per + second and use its return value instead of CLK_TCK. + +2001-02-10 Mark Kettenis <kettenis@gnu.org> + * sysdeps/unix/bsd/bsd4.4/bits/sockaddr.h (_HAVE_SA_LEN): Define. 2001-02-10 Mark Kettenis <kettenis@gnu.org> diff --git a/manual/resource.texi b/manual/resource.texi index e4f36762fa..cbab47e42c 100644 --- a/manual/resource.texi +++ b/manual/resource.texi @@ -533,7 +533,7 @@ apply only to CPU time. CPU scheduling is a complex issue and different systems do it in wildly different ways. New ideas continually develop and find their way into the intricacies of the various systems' scheduling algorithms. This -section discusses the general concepts, some specifics of systems +section discusses the general concepts, some specifics of systems that commonly use the GNU C library, and some standards. For simplicity, we talk about CPU contention as if there is only one CPU @@ -620,7 +620,7 @@ tell you what the range is on a particular system. One thing you must keep in mind when designing real time applications is that having higher absolute priority than any other process doesn't guarantee the process can run continuously. Two things that can wreck a -good CPU run are interrupts and page faults. +good CPU run are interrupts and page faults. Interrupt handlers live in that limbo between processes. The CPU is executing instructions, but they aren't part of any process. An @@ -678,7 +678,7 @@ If two processes are ready to run but have different absolute priorities, the decision is much simpler, and is described in @ref{Absolute Priority}. -Each process has a scheduling policy. For processes with absolute +Each process has a scheduling policy. For processes with absolute priority other than zero, there are two available: @enumerate @@ -792,7 +792,7 @@ The following macros represent the valid values for @var{policy}: @item SCHED_OTHER Traditional Scheduling @item SCHED_FIFO -First In First Out +First In First Out @item SCHED_RR Round Robin @end table @@ -941,7 +941,7 @@ to this function are: @comment sched.h @comment POSIX -@deftypefun int sched_set_priority_max (int *@var{policy}); +@deftypefun int sched_get_priority_max (int *@var{policy}); This function returns the highest absolute priority value that is allowable for a process that with scheduling policy @var{policy}. @@ -963,11 +963,11 @@ to this function are: @comment POSIX @deftypefun int sched_rr_get_interval (pid_t @var{pid}, struct timespec *@var{interval}) -This function returns the length of the quantum (time slice) used with +This function returns the length of the quantum (time slice) used with the Round Robin scheduling policy, if it is used, for the process with Process ID @var{pid}. -It returns the length of time as @var{interval}. +It returns the length of time as @var{interval}. @c We need a cross-reference to where timespec is explained. But that @c section doesn't exist yet, and the time chapter needs to be slightly @c reorganized so there is a place to put it (which will be right next @@ -1052,7 +1052,7 @@ immediately. In addition to its absolute priority of zero, every process has another priority, which we will refer to as "dynamic priority" because it changes -over time. The dynamic priority is meaningless for processes with +over time. The dynamic priority is meaningless for processes with an absolute priority higher than zero. The dynamic priority sometimes determines who gets the next turn on the @@ -1103,7 +1103,7 @@ other process owned by the same user (or effective user). But only a privileged process can lower its nice value. A privileged process can also raise or lower another process' nice value. -GNU C Library functions for getting and setting nice values are described in +GNU C Library functions for getting and setting nice values are described in @xref{Traditional Scheduling Functions}. @node Traditional Scheduling Functions @@ -1241,4 +1241,3 @@ nice (int increment) @} @end smallexample @end deftypefun - diff --git a/manual/string.texi b/manual/string.texi index e3c15d1dad..745cb4a0ae 100644 --- a/manual/string.texi +++ b/manual/string.texi @@ -1066,6 +1066,35 @@ located byte, or a null pointer if no match was found. @comment string.h @comment GNU +@deftypefun {void *} rawmemchr (const void *@var{block}, int @var{c}) +Often the @code{memchr} function is used with the knowledge that the +byte @var{c} is available in the memory block specified by the +parameters. But this means that the @var{size} parameter is not really +needed and that the tests performed with it at runtime (to check whether +the end of the block is reached) are not needed. + +The @code{rawmemchr} function exists for just this situation which is +surprisingly frequent. The interface is similar to @code{memchr} except +that the @var{size} parameter is missing. The function will look beyond +the end of the block pointed to by @var{block} in case the programmer +made in error in assuming that the byte @var{c} is present in the block. +In this case the result is unspecified. Otherwise the return value is a +pointer to the located byte. + +This function is of special interest when looking for the end of a +string. Since all strings are terminated by a null byte a call like + +@smallexample + rawmemchr (str, '\0') +@end smallexample + +will never go beyond the end of the string. + +This function is a GNU extension. +@end deftypefun + +@comment string.h +@comment GNU @deftypefun {void *} memrchr (const void *@var{block}, int @var{c}, size_t @var{size}) The function @code{memrchr} is like @code{memchr}, except that it searches backwards from the end of the block defined by @var{block} and @var{size} @@ -1094,7 +1123,7 @@ specifying a null character as the value of the @var{c} argument. @end deftypefun @comment string.h -@comment ??? +@comment GNU @deftypefun {char *} strchrnul (const char *@var{string}, int @var{c}) @code{strchrnul} is the same as @code{strchr} except that if it does not find the character, it returns a pointer to string's terminating diff --git a/manual/sysinfo.texi b/manual/sysinfo.texi index 187314a623..346a28cb25 100644 --- a/manual/sysinfo.texi +++ b/manual/sysinfo.texi @@ -159,7 +159,7 @@ The specifics of this function are analogous to @code{gethostname}, above. @comment unistd.h @comment ??? -@deftypefun int setdomainnname (const char *@var{name}, size_t @var{length}) +@deftypefun int setdomainname (const char *@var{name}, size_t @var{length}) @cindex NIS domain name @cindex YP domain name diff --git a/sysdeps/unix/bsd/times.c b/sysdeps/unix/bsd/times.c index 18add51063..7c4eec2b47 100644 --- a/sysdeps/unix/bsd/times.c +++ b/sysdeps/unix/bsd/times.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 92, 93, 95, 96, 97, 98 Free Software Foundation, Inc. +/* Copyright (C) 1991,92,93,95,96,97,1998,2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -18,22 +18,23 @@ #include <errno.h> #include <stddef.h> +#include <sys/resource.h> #include <sys/times.h> #include <sys/time.h> -#include <sys/resource.h> +#include <time.h> /* Time the program started. */ extern time_t _posix_start_time; -#ifdef __GNUC__ +#ifdef __GNUC__ __inline #endif static clock_t -timeval_to_clock_t (const struct timeval *tv) +timeval_to_clock_t (const struct timeval *tv, clock_t clk_tck) { - return (clock_t) ((tv->tv_sec * CLK_TCK) + - (tv->tv_usec * CLK_TCK / 1000000L)); + return (clock_t) ((tv->tv_sec * clk_tck) + + (tv->tv_usec * clk_tck / 1000000L)); } /* Store the CPU time used by this process and all its @@ -45,6 +46,7 @@ __times (buffer) struct tms *buffer; { struct rusage usage; + clock_t clk_tck; if (buffer == NULL) { @@ -52,17 +54,19 @@ __times (buffer) return (clock_t) -1; } + clk_tck = __getclktck (); + if (__getrusage (RUSAGE_SELF, &usage) < 0) return (clock_t) -1; - buffer->tms_utime = (clock_t) timeval_to_clock_t (&usage.ru_utime); - buffer->tms_stime = (clock_t) timeval_to_clock_t (&usage.ru_stime); + buffer->tms_utime = (clock_t) timeval_to_clock_t (&usage.ru_utime, clk_tck); + buffer->tms_stime = (clock_t) timeval_to_clock_t (&usage.ru_stime, clk_tck); if (__getrusage (RUSAGE_CHILDREN, &usage) < 0) return (clock_t) -1; - buffer->tms_cutime = (clock_t) timeval_to_clock_t (&usage.ru_utime); - buffer->tms_cstime = (clock_t) timeval_to_clock_t (&usage.ru_stime); + buffer->tms_cutime = (clock_t) timeval_to_clock_t (&usage.ru_utime, clk_tck); + buffer->tms_cstime = (clock_t) timeval_to_clock_t (&usage.ru_stime, clk_tck); - return (time ((time_t *) NULL) - _posix_start_time) * CLK_TCK; + return (time ((time_t *) NULL) - _posix_start_time) * clk_tck; } weak_alias (__times, times) |