e5106342c6
_foo - wrapped system call foo - weak definition to _foo and for cancellation points: _foo - wrapped system call __foo - enter cancellation point, call _foo(), leave cancellation point foo - weak definition to __foo Change use of global _thread_run to call a function to get the currently running thread. Make all pthread_foo functions weak definitions to _pthread_foo, where _pthread_foo is the implementation. This allows an application to provide its own pthread functions. Provide slightly different versions of pthread_mutex_lock and pthread_mutex_init so that we can tell the difference between a libc mutex and an application mutex. Threads holding mutexes internal to libc should never be allowed to exit, call signal handlers, or cancel. Approved by: -arch
120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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* Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
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* All rights reserved.
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* Copyright (C) 2000 Daniel M. Eischen <eischen@vigrid.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice(s), this list of conditions and the following disclaimer as
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* the first lines of this file unmodified other than the possible
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* addition of one or more copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <unistd.h>
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#include <setjmp.h>
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#include <sys/param.h>
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#include <sys/user.h>
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#include <machine/reg.h>
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#include <pthread.h>
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#include "pthread_private.h"
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/* Prototypes: */
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static inline int check_stack(pthread_t thread, void *stackp);
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#pragma weak siglongjmp=_thread_siglongjmp
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#pragma weak longjmp=_thread_longjmp
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#pragma weak _longjmp=__thread_longjmp
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void
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_thread_siglongjmp(sigjmp_buf env, int savemask)
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{
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struct pthread *curthread = _get_curthread();
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if (check_stack(curthread, (void *) GET_STACK_SJB(env)))
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PANIC("siglongjmp()ing between thread contexts is undefined by "
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"POSIX 1003.1");
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/*
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* The stack pointer is somewhere within the threads stack.
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* Jump to the users context.
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*/
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__siglongjmp(env, savemask);
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}
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void
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_thread_longjmp(jmp_buf env, int val)
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{
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struct pthread *curthread = _get_curthread();
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if (check_stack(curthread, (void *) GET_STACK_JB(env)))
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PANIC("longjmp()ing between thread contexts is undefined by "
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"POSIX 1003.1");
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/*
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* The stack pointer is somewhere within the threads stack.
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* Jump to the users context.
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*/
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__longjmp(env, val);
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}
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void
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__thread_longjmp(jmp_buf env, int val)
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{
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struct pthread *curthread = _get_curthread();
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if (check_stack(curthread, (void *) GET_STACK_JB(env)))
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PANIC("_longjmp()ing between thread contexts is undefined by "
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"POSIX 1003.1");
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/*
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* The stack pointer is somewhere within the threads stack.
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* Jump to the users context.
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*/
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___longjmp(env, val);
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}
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/* Returns 0 if stack check is OK, non-zero otherwise. */
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static inline int
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check_stack(pthread_t thread, void *stackp)
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{
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void *stack_begin, *stack_end;
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/* Get the bounds of the current threads stack. */
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PTHREAD_ASSERT(thread->stack != NULL,
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"Thread stack pointer is null");
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stack_begin = thread->stack;
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stack_end = stack_begin + thread->attr.stacksize_attr;
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/*
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* Make sure we aren't jumping to a different stack. Make sure
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* jmp_stackp is between stack_begin and stack end, to correctly detect
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* this condition regardless of whether the stack grows up or down.
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*/
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if (((stackp < stack_begin) && (stackp < stack_end)) ||
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((stackp > stack_begin) && (stackp > stack_end)))
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return (1);
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else
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return (0);
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}
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