freebsd-skq/lib/libc/gmon/gmon.c
deischen 1635c221b7 Remove _THREAD_SAFE and make libc thread-safe by default by
adding (weak definitions to) stubs for some of the pthread
functions.  If the threads library is linked in, the real
pthread functions will pulled in.

Use the following convention for system calls wrapped by the
threads library:
	__sys_foo - actual system call
	_foo - weak definition to __sys_foo
	foo - weak definition to __sys_foo

Change all libc uses of system calls wrapped by the threads
library from foo to _foo.  In order to define the prototypes
for _foo(), we introduce namespace.h and un-namespace.h
(suggested by bde).  All files that need to reference these
system calls, should include namespace.h before any standard
includes, then include un-namespace.h after the standard
includes and before any local includes.  <db.h> is an exception
and shouldn't be included in between namespace.h and
un-namespace.h  namespace.h will define foo to _foo, and
un-namespace.h will undefine foo.

Try to eliminate some of the recursive calls to MT-safe
functions in libc/stdio in preparation for adding a mutex
to FILE.  We have recursive mutexes, but would like to avoid
using them if possible.

Remove uneeded includes of <errno.h> from a few files.

Add $FreeBSD$ to a few files in order to pass commitprep.

Approved by:	-arch
2001-01-24 13:01:12 +00:00

267 lines
7.0 KiB
C

/*-
* Copyright (c) 1983, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)gmon.c 8.1 (Berkeley) 6/4/93";
#endif
#include "namespace.h"
#include <sys/param.h>
#include <sys/time.h>
#include <sys/gmon.h>
#include <sys/sysctl.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"
#if defined(__ELF__) && defined(i386)
extern char *minbrk asm (".minbrk");
#else
extern char *minbrk asm ("minbrk");
#endif
extern char *__progname;
struct gmonparam _gmonparam = { GMON_PROF_OFF };
static int s_scale;
/* see profil(2) where this is describe (incorrectly) */
#define SCALE_1_TO_1 0x10000L
#define ERR(s) _write(2, s, sizeof(s))
void moncontrol __P((int));
static int hertz __P((void));
void
monstartup(lowpc, highpc)
u_long lowpc;
u_long highpc;
{
register int o;
char *cp;
struct gmonparam *p = &_gmonparam;
/*
* round lowpc and highpc to multiples of the density we're using
* so the rest of the scaling (here and in gprof) stays in ints.
*/
p->lowpc = ROUNDDOWN(lowpc, HISTFRACTION * sizeof(HISTCOUNTER));
p->highpc = ROUNDUP(highpc, HISTFRACTION * sizeof(HISTCOUNTER));
p->textsize = p->highpc - p->lowpc;
p->kcountsize = p->textsize / HISTFRACTION;
p->hashfraction = HASHFRACTION;
p->fromssize = p->textsize / HASHFRACTION;
p->tolimit = p->textsize * ARCDENSITY / 100;
if (p->tolimit < MINARCS)
p->tolimit = MINARCS;
else if (p->tolimit > MAXARCS)
p->tolimit = MAXARCS;
p->tossize = p->tolimit * sizeof(struct tostruct);
cp = sbrk(p->kcountsize + p->fromssize + p->tossize);
if (cp == (char *)-1) {
ERR("monstartup: out of memory\n");
return;
}
#ifdef notdef
bzero(cp, p->kcountsize + p->fromssize + p->tossize);
#endif
p->tos = (struct tostruct *)cp;
cp += p->tossize;
p->kcount = (u_short *)cp;
cp += p->kcountsize;
p->froms = (u_short *)cp;
minbrk = sbrk(0);
p->tos[0].link = 0;
o = p->highpc - p->lowpc;
if (p->kcountsize < o) {
#ifndef hp300
s_scale = ((float)p->kcountsize / o ) * SCALE_1_TO_1;
#else /* avoid floating point */
int quot = o / p->kcountsize;
if (quot >= 0x10000)
s_scale = 1;
else if (quot >= 0x100)
s_scale = 0x10000 / quot;
else if (o >= 0x800000)
s_scale = 0x1000000 / (o / (p->kcountsize >> 8));
else
s_scale = 0x1000000 / ((o << 8) / p->kcountsize);
#endif
} else
s_scale = SCALE_1_TO_1;
moncontrol(1);
}
void
_mcleanup()
{
int fd;
int fromindex;
int endfrom;
u_long frompc;
int toindex;
struct rawarc rawarc;
struct gmonparam *p = &_gmonparam;
struct gmonhdr gmonhdr, *hdr;
struct clockinfo clockinfo;
char outname[128];
int mib[2];
size_t size;
#ifdef DEBUG
int log, len;
char buf[200];
#endif
if (p->state == GMON_PROF_ERROR)
ERR("_mcleanup: tos overflow\n");
size = sizeof(clockinfo);
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
if (sysctl(mib, 2, &clockinfo, &size, NULL, 0) < 0) {
/*
* Best guess
*/
clockinfo.profhz = hertz();
} else if (clockinfo.profhz == 0) {
if (clockinfo.hz != 0)
clockinfo.profhz = clockinfo.hz;
else
clockinfo.profhz = hertz();
}
moncontrol(0);
snprintf(outname,sizeof(outname),"%s.gmon",__progname);
fd = _open(outname, O_CREAT|O_TRUNC|O_WRONLY, 0666);
if (fd < 0) {
warnx("_mcleanup: %s - %s",outname,strerror(errno));
return;
}
#ifdef DEBUG
log = _open("gmon.log", O_CREAT|O_TRUNC|O_WRONLY, 0664);
if (log < 0) {
perror("_mcleanup: gmon.log");
return;
}
len = sprintf(buf, "[mcleanup1] kcount 0x%x ssiz %d\n",
p->kcount, p->kcountsize);
_write(log, buf, len);
#endif
hdr = (struct gmonhdr *)&gmonhdr;
hdr->lpc = p->lowpc;
hdr->hpc = p->highpc;
hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
hdr->version = GMONVERSION;
hdr->profrate = clockinfo.profhz;
_write(fd, (char *)hdr, sizeof *hdr);
_write(fd, p->kcount, p->kcountsize);
endfrom = p->fromssize / sizeof(*p->froms);
for (fromindex = 0; fromindex < endfrom; fromindex++) {
if (p->froms[fromindex] == 0)
continue;
frompc = p->lowpc;
frompc += fromindex * p->hashfraction * sizeof(*p->froms);
for (toindex = p->froms[fromindex]; toindex != 0;
toindex = p->tos[toindex].link) {
#ifdef DEBUG
len = sprintf(buf,
"[mcleanup2] frompc 0x%x selfpc 0x%x count %d\n" ,
frompc, p->tos[toindex].selfpc,
p->tos[toindex].count);
_write(log, buf, len);
#endif
rawarc.raw_frompc = frompc;
rawarc.raw_selfpc = p->tos[toindex].selfpc;
rawarc.raw_count = p->tos[toindex].count;
_write(fd, &rawarc, sizeof rawarc);
}
}
_close(fd);
}
/*
* Control profiling
* profiling is what mcount checks to see if
* all the data structures are ready.
*/
void
moncontrol(mode)
int mode;
{
struct gmonparam *p = &_gmonparam;
if (mode) {
/* start */
profil((char *)p->kcount, p->kcountsize, p->lowpc, s_scale);
p->state = GMON_PROF_ON;
} else {
/* stop */
profil((char *)0, 0, 0, 0);
p->state = GMON_PROF_OFF;
}
}
/*
* discover the tick frequency of the machine
* if something goes wrong, we return 0, an impossible hertz.
*/
static int
hertz()
{
struct itimerval tim;
tim.it_interval.tv_sec = 0;
tim.it_interval.tv_usec = 1;
tim.it_value.tv_sec = 0;
tim.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &tim, 0);
setitimer(ITIMER_REAL, 0, &tim);
if (tim.it_interval.tv_usec < 2)
return(0);
return (1000000 / tim.it_interval.tv_usec);
}