74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/* Linuxthreads - a simple clone()-based implementation of Posix */
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/* threads for Linux. */
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/* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr) */
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/* */
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/* This program is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU Library General Public License */
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/* as published by the Free Software Foundation; either version 2 */
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/* of the License, or (at your option) any later version. */
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/* */
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/* This program 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 */
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/* GNU Library General Public License for more details. */
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/* Redefine siglongjmp and longjmp so that they interact correctly
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with cleanup handlers */
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#include <setjmp.h>
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#include "pthread.h"
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#include "internals.h"
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/* These functions are not declared anywhere since they shouldn't be
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used at another place but here. */
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extern void __libc_siglongjmp (sigjmp_buf env, int val)
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__attribute__ ((noreturn));
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extern void __libc_longjmp (jmp_buf env, int val)
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__attribute__ ((noreturn));
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static void pthread_cleanup_upto(jmp_buf target)
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{
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pthread_descr self = thread_self();
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struct _pthread_cleanup_buffer * c;
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char *currentframe = CURRENT_STACK_FRAME;
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for (c = THREAD_GETMEM(self, p_cleanup);
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c != NULL && _JMPBUF_UNWINDS(target, c);
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c = c->__prev)
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{
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#if _STACK_GROWS_DOWN
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if ((char *) c <= currentframe)
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{
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c = NULL;
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break;
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}
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#elif _STACK_GROWS_UP
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if ((char *) c >= currentframe)
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{
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c = NULL;
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break;
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}
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#else
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# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
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#endif
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c->__routine(c->__arg);
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}
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THREAD_SETMEM(self, p_cleanup, c);
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if (THREAD_GETMEM(self, p_in_sighandler)
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&& _JMPBUF_UNWINDS(target, THREAD_GETMEM(self, p_in_sighandler)))
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THREAD_SETMEM(self, p_in_sighandler, NULL);
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}
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void siglongjmp(sigjmp_buf env, int val)
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{
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pthread_cleanup_upto(env.__buf);
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__libc_siglongjmp(env, val);
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}
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void longjmp(jmp_buf env, int val)
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{
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pthread_cleanup_upto(env);
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__libc_longjmp(env, val);
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}
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