237 lines
6.2 KiB
C
237 lines
6.2 KiB
C
/* $NetBSD: pthread_debug.c,v 1.12 2007/03/02 18:53:52 ad Exp $ */
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/*-
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* Copyright (c) 2001, 2006, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: pthread_debug.c,v 1.12 2007/03/02 18:53:52 ad Exp $");
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/shm.h>
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#include <sys/types.h>
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#include "pthread.h"
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#include "pthread_int.h"
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int pthread__dbg;
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#ifdef PTHREAD__DEBUG
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int pthread__debug_counters[PTHREADD_NCOUNTERS];
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static struct pthread_msgbuf *debugbuf;
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#define MAXLINELEN 1000
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struct linebuf {
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char buf[MAXLINELEN];
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int len;
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};
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static struct linebuf *linebuf;
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static void pthread__debug_printcounters(void);
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static const char *pthread__counternames[] = PTHREADD_INITCOUNTERNAMES;
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extern int pthread__maxconcurrency, pthread__started;
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void pthread__debug_init(int ncpu)
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{
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time_t t;
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int i;
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if (getenv("PTHREAD_DEBUGCOUNTERS") != NULL)
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atexit(pthread__debug_printcounters);
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if (getenv("PTHREAD_DEBUGLOG") != NULL) {
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t = time(NULL);
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debugbuf = pthread__debuglog_init(0);
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linebuf = malloc(ncpu * sizeof(struct linebuf));
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if (linebuf == NULL)
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err(1, "Couldn't allocate linebuf");
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for (i = 0; i < ncpu; i++)
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linebuf[i].len = 0;
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DPRINTF(("Started debugging %s (pid %d) at %s\n",
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getprogname(), getpid(), ctime(&t)));
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}
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}
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static void
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pthread__debug_printcounters(void)
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{
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int i;
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int counts[PTHREADD_NCOUNTERS];
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/*
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* Copy the counters before printing anything to so that we don't see
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* the effect of printing the counters.
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* There will still be one more mutex lock than unlock, because
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* atexit() handling itself will call us back with a mutex locked.
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*/
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for (i = 0; i < PTHREADD_NCOUNTERS; i++)
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counts[i] = pthread__debug_counters[i];
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printf("Pthread event counters\n");
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for (i = 0; i < PTHREADD_NCOUNTERS; i++)
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printf("%2d %-20s %9d\n", i, pthread__counternames[i],
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counts[i]);
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printf("\n");
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}
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struct pthread_msgbuf *
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pthread__debuglog_init(int force)
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{
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int debugshmid;
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void *debuglog;
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struct pthread_msgbuf* buf;
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debugshmid = shmget((key_t)PTHREAD__DEBUG_SHMKEY,
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PTHREAD__DEBUG_SHMSIZE, IPC_CREAT | S_IRWXU | S_IRWXG | S_IRWXO);
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if (debugshmid == -1)
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err(1, "Couldn't get shared debug log");
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debuglog = shmat(debugshmid, 0, 0);
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if (debuglog == (void *)-1)
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err(1, "Couldn't map shared debug log (ID %d)", debugshmid);
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buf = (struct pthread_msgbuf *)debuglog;
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if (force || buf->msg_magic != BUF_MAGIC) {
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/* Initialize */
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buf->msg_magic = BUF_MAGIC;
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buf->msg_bufw = 0;
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buf->msg_bufr = 0;
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buf->msg_bufs = PTHREAD__DEBUG_SHMSIZE -
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sizeof (struct pthread_msgbuf);
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}
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return buf;
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}
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void
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pthread__debuglog_printf(const char *fmt, ...)
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{
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char *tmpbuf;
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size_t len, cplen, r, w, s;
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long diff1, diff2;
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int vpid;
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va_list ap;
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if (debugbuf == NULL || linebuf == NULL)
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return;
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vpid = (int)_lwp_self();
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tmpbuf = linebuf[vpid].buf;
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len = linebuf[vpid].len;
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#if defined(PTHREAD_PID_DEBUG) || defined(PTHREAD_VP_DEBUG)
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if (len == 0) {
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#ifdef PTHREAD_PID_DEBUG
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len += sprintf(tmpbuf, "[%05d]", getpid());
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#endif
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#ifdef PTHREAD_VP_DEBUG
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if (pthread__maxconcurrency > 1)
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len += sprintf(tmpbuf + len, "[%d]", vpid);
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#endif
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}
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#endif
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va_start(ap, fmt);
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len += vsnprintf(tmpbuf + len, (unsigned int)(MAXLINELEN - len),
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fmt, ap);
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va_end(ap);
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linebuf[vpid].len = len;
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if (tmpbuf[len - 1] != '\n')
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return;
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r = debugbuf->msg_bufr;
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w = debugbuf->msg_bufw;
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s = debugbuf->msg_bufs;
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diff1 = (long)w - (long)r;
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if (w + len >= s) {
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cplen = s - w;
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debugbuf->msg_bufw = len - cplen;
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(void)memcpy(&debugbuf->msg_bufc[w],
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tmpbuf, cplen);
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(void)memcpy(&debugbuf->msg_bufc[0], tmpbuf + cplen,
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len - cplen);
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w = len - cplen;
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/* Check for lapping the read pointer. */
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diff2 = (long)w - (long)r;
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if (((diff1 < 0) && (diff2 <= 0)) ||
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((diff1 > 0) && (diff2 >= 0)))
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debugbuf->msg_bufr = (w + 1) % s;
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} else {
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debugbuf->msg_bufw = w + len;
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(void)memcpy(&debugbuf->msg_bufc[w],
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tmpbuf, len);
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w += len;
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/* Check for lapping the read pointer. */
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diff2 = (long)w - (long)r;
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if ((diff1 < 0) && (diff2 >= 0))
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debugbuf->msg_bufr = (w + 1) % s;
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}
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linebuf[vpid].len = 0;
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}
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int
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pthread__debuglog_newline(void)
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{
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int vpid;
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if (debugbuf == NULL)
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return 1;
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vpid = (int)_lwp_self();
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return (linebuf[vpid].len == 0);
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}
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#endif /* PTHREAD__DEBUG */
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