b5a8a15c2f
file descriptors needing to be polled (Doh!). Reported
by Dan Nelson <dnelson@emsphone.com>.
Don't install and start the scheduling timer until the
first thread is created. This prevents the overhead of
having a periodic scheduling signal in a single threaded
program. Reported by Dan Nelson <dnelson@emsphone.com>.
Allow builtin longjmps out of application installed
signal handlers without the need perform any post-handler
cleanup:
o Change signal handling to save the threads interrupted
context on the stack. The threads current context is
now always stored in the same place (in the pthread).
If and when a signal handler returns, the interrupted
context is copied back to the storage area in the pthread.
o Before calling invoking a signal handler for a thread,
back the thread out of any internal waiting queues
(mutex, CV, join, etc) to which it belongs.
Rework uthread_info.c a bit to make it easier to change
the format of a thread dump.
Use an alternal signal stack for the thread library's
signal handler. This allows us to fiddle with the main
threads stack without fear of it being in use.
Reviewed by: jasone
112 lines
3.5 KiB
C
112 lines
3.5 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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#ifdef _THREAD_SAFE
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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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void
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siglongjmp(sigjmp_buf env, int savemask)
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{
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if (check_stack(_thread_run, (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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longjmp(jmp_buf env, int val)
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{
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if (check_stack(_thread_run, (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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_longjmp(jmp_buf env, int val)
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{
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if (check_stack(_thread_run, (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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#endif
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