ncr.c

Netscape NSPR库源码

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

/*
 * NCR 3.0  - cloned from UnixWare by ruslan
 */
#include "primpl.h"

#include <setjmp.h>

void _MD_EarlyInit(void)
{
}

PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
{
    if (isCurrent) {
	(void) setjmp(CONTEXT(t));
    }
    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
    return (PRWord *) CONTEXT(t);
}

#ifdef ALARMS_BREAK_TCP /* I don't think they do */

PRInt32 _MD_connect(PRInt32 osfd, const PRNetAddr *addr, PRInt32 addrlen,
                        PRIntervalTime timeout)
{
    PRInt32 rv;

    _MD_BLOCK_CLOCK_INTERRUPTS();
    rv = _connect(osfd,addr,addrlen);
    _MD_UNBLOCK_CLOCK_INTERRUPTS();
}

PRInt32 _MD_accept(PRInt32 osfd, PRNetAddr *addr, PRInt32 addrlen,
                        PRIntervalTime timeout)
{
    PRInt32 rv;

    _MD_BLOCK_CLOCK_INTERRUPTS();
    rv = _accept(osfd,addr,addrlen);
    _MD_UNBLOCK_CLOCK_INTERRUPTS();
    return(rv);
}
#endif

/*
 * These are also implemented in pratom.c using NSPR locks.  Any reason
 * this might be better or worse?  If you like this better, define
 * _PR_HAVE_ATOMIC_OPS in include/md/unixware.h
 */
#ifdef _PR_HAVE_ATOMIC_OPS
/* Atomic operations */
#include  <stdio.h>
static FILE *_uw_semf;

void
_MD_INIT_ATOMIC(void)
{
    /* Sigh.  Sure wish SYSV semaphores weren't such a pain to use */
    if ((_uw_semf = tmpfile()) == NULL)
        PR_ASSERT(0);

    return;
}

void
_MD_ATOMIC_INCREMENT(PRInt32 *val)
{
    flockfile(_uw_semf);
    (*val)++;
    unflockfile(_uw_semf);
}

void
_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
{
    flockfile(_uw_semf);
    (*ptr) += val;
    unflockfile(_uw_semf);
}


void
_MD_ATOMIC_DECREMENT(PRInt32 *val)
{
    flockfile(_uw_semf);
    (*val)--;
    unflockfile(_uw_semf);
}

void
_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
{
    flockfile(_uw_semf);
    *val = newval;
    unflockfile(_uw_semf);
}
#endif

void
_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
{
    return;
}

PRStatus
_MD_InitializeThread(PRThread *thread)
{
	return PR_SUCCESS;
}

PRStatus
_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
{
    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
    _PR_MD_SWITCH_CONTEXT(thread);
    return PR_SUCCESS;
}

PRStatus
_MD_WAKEUP_WAITER(PRThread *thread)
{
    if (thread) {
	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
    }
    return PR_SUCCESS;
}

/* These functions should not be called for Unixware */
void
_MD_YIELD(void)
{
    PR_NOT_REACHED("_MD_YIELD should not be called for Unixware.");
}

PRStatus
_MD_CREATE_THREAD(
    PRThread *thread,
    void (*start) (void *),
    PRUintn priority,
    PRThreadScope scope,
    PRThreadState state,
    PRUint32 stackSize)
{
    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Unixware.");
    return PR_FAILURE;
}

/*
 This is temp. replacement for localtime_r. Normally PR_ExplodeTime should
 be used as to my understanding
*/

/*
** $$$$$ THEN WHY ARE WE DOING THIS? - AOF $$$$$
*/

#define NEED_LOCALTIME_R
#define NEED_GMTIME_R
#define NEED_ASCTIME_R
#define NEED_STRTOK_R
#define NEED_CTIME_R

#if defined (NEED_LOCALTIME_R) || defined (NEED_CTIME_R) || defined (NEED_ASCTIME_R) || defined (NEED_GMTIME_R) || defined (NEED_STRTOK_R)
#include "prlock.h"
#endif

#if defined (NEED_LOCALTIME_R)

static PRLock *localtime_r_monitor = NULL;

struct tm *localtime_r (const time_t *clock, struct tm *result)
{
    struct tm *tmPtr;
    int needLock = PR_Initialized();  /* We need to use a lock to protect
                                       * against NSPR threads only when the
                                       * NSPR thread system is activated. */

    if (needLock) {
        if (localtime_r_monitor == NULL) {

            localtime_r_monitor = PR_NewLock();
        }
        PR_Lock(localtime_r_monitor);
    }

    /*
     * On Windows, localtime() returns a NULL pointer if 'clock'
     * represents a time before midnight January 1, 1970.  In
     * that case, we also return a NULL pointer and the struct tm
     * object pointed to by 'result' is not modified.
     */

    tmPtr = localtime(clock);
    if (tmPtr) {
        *result = *tmPtr;
    } else {
        result = NULL;
    }

    if (needLock) PR_Unlock(localtime_r_monitor);

    return result;
}

#endif

#if defined (NEED_GMTIME_R)

static PRLock *gmtime_r_monitor = NULL;

struct tm *gmtime_r (const time_t *clock, struct tm *result)
{
    struct tm *tmPtr;
    int needLock = PR_Initialized();  /* We need to use a lock to protect
                                       * against NSPR threads only when the
                                       * NSPR thread system is activated. */

    if (needLock) {
        if (gmtime_r_monitor == NULL) {
            gmtime_r_monitor = PR_NewLock();
        }
        PR_Lock(gmtime_r_monitor);
    }

    tmPtr = gmtime(clock);
    if (tmPtr) {
        *result = *tmPtr;
    } else {
        result = NULL;
    }

    if (needLock) PR_Unlock(gmtime_r_monitor);

    return result;
}

#endif

#if defined (NEED_CTIME_R)

static PRLock *ctime_r_monitor = NULL;

char  *ctime_r (const time_t *clock, char *buf, int buflen)
{
    char *cbuf;
    int needLock = PR_Initialized();  /* We need to use a lock to protect
                                       * against NSPR threads only when the
                                       * NSPR thread system is activated. */

    if (needLock) {

        if (ctime_r_monitor == NULL) {
            ctime_r_monitor = PR_NewLock();
        }
        PR_Lock(ctime_r_monitor);
    }

    cbuf = ctime (clock);
    if (cbuf) {
        strncpy (buf, cbuf, buflen - 1);
        buf[buflen - 1] = 0;
    }

    if (needLock) PR_Unlock(ctime_r_monitor);

    return cbuf;
}

#endif

#if defined (NEED_ASCTIME_R)

static PRLock *asctime_r_monitor = NULL;


char  *asctime_r (const struct tm  *tm, char *buf, int buflen)
{
    char *cbuf;
    int needLock = PR_Initialized();  /* We need to use a lock to protect
                                       * against NSPR threads only when the
                                       * NSPR thread system is activated. */

    if (needLock) {
        if (asctime_r_monitor == NULL) {
            asctime_r_monitor = PR_NewLock();
        }
        PR_Lock(asctime_r_monitor);
    }

    cbuf = asctime (tm);
    if (cbuf) {
        strncpy (buf, cbuf, buflen - 1);
        buf[buflen - 1] = 0;
    }

    if (needLock) PR_Unlock(asctime_r_monitor);

    return cbuf;

}
#endif

#if defined (NEED_STRTOK_R)

char *
strtok_r (s, delim, last)
        register char *s;
        register const char *delim;
        register char **last;
{
        register char *spanp;
        register int c, sc;
        char *tok;


        if (s == NULL && (s = *last) == NULL)
                return (NULL);

        /*
         * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
         */
cont:

        c = *s++;
        for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
                if (c == sc)
                        goto cont;
        }

        if (c == 0) {           /* no non-delimiter characters */
                *last = NULL;
                return (NULL);
        }
        tok = s - 1;

        /*
         * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
         * Note that delim must have one NUL; we stop if we see that, too.
         */
        for (;;) {
                c = *s++;
                spanp = (char *)delim;
                do {
                        if ((sc = *spanp++) == c) {
                                if (c == 0)
                                        s = NULL;

                                else
                                        s[-1] = 0;
                                *last = s;
                                return (tok);
                        }
                } while (sc != 0);
        }
        /* NOTREACHED */
}

#endif