/*
 * Copyright 2000, International Business Machines Corporation and others.
 * All Rights Reserved.
 *
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 */
/* ********************************************************************** */
/*                                                                        */
/*  trheadname.c                                                          */
/*                                                                        */
/*  Author: Hartmut Reuter                                                */
/*  reuter@rzg.mpg.de                                                     */
/*  Date: 01/12/00                                                        */
/*                                                                        */
/*  Function    - These routiens implement thread names for the           */
/*                logging from the servers                                */
/*                                                                        */
/* ********************************************************************** */

#include <afsconfig.h>
#include <afs/param.h>

RCSID
    ("$Header: /cvs/openafs/src/lwp/threadname.c,v 1.10 2003/11/29 22:08:14 jaltman Exp $");

#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
#if defined(AFS_PTHREAD_ENV)
#include <pthread.h>
#else /* defined(AFS_PTHREAD_ENV) */
#include "lwp.h"
#endif /* defined(AFS_PTHREAD_ENV) */

#define MAX_THREADS 128
#define MAXTHREADNAMELENGTH 64
int nThreads = 0;
#if defined(AFS_PTHREAD_ENV)
pthread_t ThreadId[MAX_THREADS];
#else /* defined(AFS_PTHREAD_ENV) */
PROCESS ThreadId[MAX_THREADS];
#endif /* defined(AFS_PTHREAD_ENV) */
char ThreadName[MAX_THREADS][MAXTHREADNAMELENGTH];

char *
threadname(void)
{
    int i;
    static char MainThread[] = "main";
    char *ptr;
    char *p;
#ifdef AFS_PTHREAD_ENV
    pthread_t me;
#else /* AFS_PTHREAD_ENV */
    PROCESS me;
#endif /* AFS_PTHREAD_ENV */

#ifdef AFS_PTHREAD_ENV
    me = pthread_self();
#else /* AFS_PTHREAD_ENV */
    me = (PROCESS) LWP_ThreadId();
#endif /* AFS_PTHREAD_ENV */
    ptr = &MainThread[0];
    for (i = 0; i < nThreads; i++) {
	if (ThreadId[i] == me) {
	    ptr = &ThreadName[i][0];
	    break;
	}
    }
    p = ptr;
    return p;
}

int
registerthread(
#ifdef AFS_PTHREAD_ENV
		  pthread_t id,
#else				/* AFS_PTHREAD_ENV */
		  PROCESS id,
#endif				/* AFS_PTHREAD_ENV */
		  char *name)
{
    int i;

    for (i = 0; i < nThreads; i++) {
	if (ThreadId[i] == id) {
	    strncpy(&ThreadName[i][0], name, MAXTHREADNAMELENGTH);
	    return 0;
	}
    }
    if (nThreads == MAX_THREADS)
	return 0;
    ThreadId[nThreads] = id;
    strncpy(&ThreadName[nThreads][0], name, MAXTHREADNAMELENGTH);
    ThreadName[nThreads][MAXTHREADNAMELENGTH - 1] = 0;
    nThreads++;

    return 0;
}

int
swapthreadname(
#ifdef AFS_PTHREAD_ENV
		  pthread_t id,
#else				/* AFS_PTHREAD_ENV */
		  PROCESS id,
#endif				/* AFS_PTHREAD_ENV */
		  char *new, char *old)
{
    int i;

    for (i = 0; i < nThreads; i++) {
	if (ThreadId[i] == id) {
	    if (old)
		strncpy(old, &ThreadName[i][0], MAXTHREADNAMELENGTH);
	    strncpy(&ThreadName[i][0], new, MAXTHREADNAMELENGTH);
	    return 0;
	}
    }
    return 1;
}
