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085a441220
char array resp. pointer. * iconvdata/iso-2022-kr.c (BODY): Make buf unsigned char instead of char array. * iconvdata/cns11643.h (cns11643_to_ucs4): Change first argument to const unsigned char **. (ucs4_to_cns11643): Change second argument to unsigned char *. * iconvdata/euc-tw.c (BODY): Change endp type to const unsigned char *. * iconvdata/iso-ir-165.h (ucs4_to_isoir165): Change second argument to unsigned char *. * iconvdata/ibm1008_420.c (LOOP_NEED_FLAGS): Don't define. * iconvdata/iso-2022-cn.c (BODY): Change buf to unsigned char array. * iconvdata/iso-2022-cn-ext.c (BODY): Change buf, tmpbuf, tmp types to unsigned char pointers/arrays instead of char. * iconvdata/jis0201.h (ucs4_to_jisx0201): Change second argument to unsigned char *. * iconvdata/jis0208.h (ucs4_to_jisx0208): Likewise. * iconvdata/jis0212.h: Include assert.h. (ucs4_to_jisx0212): Change second argument to unsigned char *. assert that if cp[0] is not '\0', cp[1] is not '\0' either instead of trying to handle that. * iconvdata/euc-kr.c (euckr_from_ucs4): Initialize also cp[1] to shut up a warning. * iconvdata/euc-jp-ms.c (from_ucs4_lat1, from_ucs4_greek, from_ucs4_cjk, from_ucs4_cjkcpt, from_ucs4_extra): Change type to two dimensional const unsigned char arrays. (BODY): Cast "" to (const unsigned char *) for assignment to cp. Initialize endp to inptr to shut up a warning.
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/* Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "pthreadP.h"
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#include <lowlevellock.h>
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unsigned long int __fork_generation attribute_hidden;
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static void
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clear_once_control (void *arg)
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{
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pthread_once_t *once_control = (pthread_once_t *) arg;
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*once_control = 0;
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lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
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}
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int
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__pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
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{
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for (;;)
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{
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int oldval;
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int newval;
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int tmp;
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/* Pseudo code:
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newval = __fork_generation | 1;
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oldval = *once_control;
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if ((oldval & 2) == 0)
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*once_control = newval;
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Do this atomically.
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*/
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newval = __fork_generation | 1;
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__asm __volatile ("1: lwarx %0,0,%3\n"
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" andi. %1,%0,2\n"
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" bne 2f\n"
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" stwcx. %4,0,%3\n"
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" bne 1b\n"
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"2: isync"
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: "=&r" (oldval), "=&r" (tmp), "=m" (*once_control)
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: "r" (once_control), "r" (newval), "m" (*once_control)
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: "cr0");
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/* Check if the initializer has already been done. */
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if ((oldval & 2) != 0)
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return 0;
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/* Check if another thread already runs the initializer. */
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if ((oldval & 1) == 0)
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break;
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/* Check whether the initializer execution was interrupted by a fork. */
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if (oldval != newval)
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break;
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/* Same generation, some other thread was faster. Wait. */
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lll_futex_wait (once_control, oldval, LLL_PRIVATE);
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}
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/* This thread is the first here. Do the initialization.
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Register a cleanup handler so that in case the thread gets
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interrupted the initialization can be restarted. */
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pthread_cleanup_push (clear_once_control, once_control);
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init_routine ();
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pthread_cleanup_pop (0);
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/* Add one to *once_control to take the bottom 2 bits from 01 to 10. */
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atomic_increment (once_control);
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/* Wake up all other threads. */
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lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
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return 0;
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}
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weak_alias (__pthread_once, pthread_once)
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strong_alias (__pthread_once, __pthread_once_internal)
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