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 void __pthread_cleanup_upto (__jmp_buf target, char *targetframe)
  31 {
  32   pthread_descr self = thread_self();
  33   struct _pthread_cleanup_buffer * c;
  34
  35   for (c = THREAD_GETMEM(self, p_cleanup);
  36        c != NULL && _JMPBUF_UNWINDS(target, c);
  37        c = c->__prev)
  38     {
  39 #if _STACK_GROWS_DOWN
  40       if ((char *) c <= targetframe)
  41         {
  42           c = NULL;
  43           break;
  44         }
  45 #elif _STACK_GROWS_UP
  46       if ((char *) c >= targetframe)
  47         {
  48           c = NULL;
  49           break;
  50         }
  51 #else
  52 # error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
  53 #endif
  54       c->__routine(c->__arg);
  55     }
  56   THREAD_SETMEM(self, p_cleanup, c);
  57   if (THREAD_GETMEM(self, p_in_sighandler)
  58       && _JMPBUF_UNWINDS(target, THREAD_GETMEM(self, p_in_sighandler)))
  59     THREAD_SETMEM(self, p_in_sighandler, NULL);
  60 }
  61
  62 #ifdef SHARED
  63 void siglongjmp (sigjmp_buf env, int val)
  64 {
  65   __libc_siglongjmp (env, val);
  66 }
  67
  68 void longjmp (jmp_buf env, int val)
  69 {
  70   __libc_longjmp (env, val);
  71 }
  72 #endif