linuxthreads/ptlongjmp.c

   1 /* Linuxthreads - a simple clone()-based implementation of Posix        */
   2 /* threads for Linux.                                                   */
   3 /* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr)              */
   4 /*                                                                      */
   5 /* This program is free software; you can redistribute it and/or        */
   6 /* modify it under the terms of the GNU Library General Public License  */
   7 /* as published by the Free Software Foundation; either version 2       */
   8 /* of the License, or (at your option) any later version.               */
   9 /*                                                                      */
  10 /* This program is distributed in the hope that it will be useful,      */
  11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of       */
  12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        */
  13 /* GNU Library General Public License for more details.                 */
  14
  15 /* Redefine siglongjmp and longjmp so that they interact correctly
  16    with cleanup handlers */
  17
  18 #include <setjmp.h>
  19 #include "pthread.h"
  20 #include "internals.h"
  21
  22 /* These functions are not declared anywhere since they shouldn't be
  23    used at another place but here.  */
  24 extern void __libc_siglongjmp (sigjmp_buf env, int val)
  25      __attribute__ ((noreturn));
  26 extern void __libc_longjmp (sigjmp_buf env, int val)
  27      __attribute__ ((noreturn));
  28
  29
  30 static void pthread_cleanup_upto(__jmp_buf target)
  31 {
  32   pthread_descr self = thread_self();
  33   struct _pthread_cleanup_buffer * c;
  34
  35   for (c = self->p_cleanup;
  36        c != NULL && _JMPBUF_UNWINDS(target, c);
  37        c = c->prev)
  38     c->routine(c->arg);
  39   self->p_cleanup = c;
  40   if (self->p_in_sighandler && _JMPBUF_UNWINDS(target, self->p_in_sighandler))
  41     self->p_in_sighandler = NULL;
  42 }
  43
  44 void siglongjmp(sigjmp_buf env, int val)
  45 {
  46   pthread_cleanup_upto(env->__jmpbuf);
  47   __libc_siglongjmp(env, val);
  48 }
  49
  50 void longjmp(jmp_buf env, int val)
  51 {
  52   pthread_cleanup_upto(env->__jmpbuf);
  53   __libc_longjmp(env, val);
  54 }