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use libco instead of state-thread(st), still have some bug
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88 changed files with 4836 additions and 19273 deletions
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Netscape Portable Runtime library.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s): Silicon Graphics, Inc.
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*
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* Portions created by SGI are Copyright (C) 2000-2001 Silicon
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* Graphics, Inc. All Rights Reserved.
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*/
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/*
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* This file is derived directly from Netscape Communications Corporation,
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* and consists of extensive modifications made during the year(s) 1999-2000.
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "common.h"
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/* How much space to leave between the stacks, at each end */
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#define REDZONE _ST_PAGE_SIZE
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_st_clist_t _st_free_stacks = ST_INIT_STATIC_CLIST(&_st_free_stacks);
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int _st_num_free_stacks = 0;
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int _st_randomize_stacks = 0;
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static char *_st_new_stk_segment(int size);
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/**
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The below comments is by winlin:
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The stack memory struct:
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| REDZONE | stack | extra | REDZONE |
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+---------+------------------------+---------+---------+
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| 4k | | 4k/0 | 4k |
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+---------+------------------------+---------+---------+
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vaddr bottom top
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When _st_randomize_stacks is on, by st_randomize_stacks(),
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the bottom and top will random movided in the extra:
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long offset = (random() % extra) & ~0xf;
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ts->stk_bottom += offset;
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ts->stk_top += offset;
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Both REDZONE are protected by mprotect when DEBUG is on.
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*/
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_st_stack_t *_st_stack_new(int stack_size)
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{
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_st_clist_t *qp;
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_st_stack_t *ts;
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int extra;
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// TODO: WINLIN: remove the stack reuse.
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for (qp = _st_free_stacks.next; qp != &_st_free_stacks; qp = qp->next) {
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ts = _ST_THREAD_STACK_PTR(qp);
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if (ts->stk_size >= stack_size) {
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/* Found a stack that is big enough */
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ST_REMOVE_LINK(&ts->links);
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_st_num_free_stacks--;
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ts->links.next = NULL;
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ts->links.prev = NULL;
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return ts;
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}
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}
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/* Make a new thread stack object. */
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if ((ts = (_st_stack_t *)calloc(1, sizeof(_st_stack_t))) == NULL) {
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return NULL;
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}
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extra = _st_randomize_stacks ? _ST_PAGE_SIZE : 0;
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ts->vaddr_size = stack_size + 2*REDZONE + extra;
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ts->vaddr = _st_new_stk_segment(ts->vaddr_size);
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if (!ts->vaddr) {
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free(ts);
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return NULL;
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}
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ts->stk_size = stack_size;
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ts->stk_bottom = ts->vaddr + REDZONE;
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ts->stk_top = ts->stk_bottom + stack_size;
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#ifdef DEBUG
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mprotect(ts->vaddr, REDZONE, PROT_NONE);
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mprotect(ts->stk_top + extra, REDZONE, PROT_NONE);
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#endif
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if (extra) {
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long offset = (random() % extra) & ~0xf;
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ts->stk_bottom += offset;
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ts->stk_top += offset;
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}
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return ts;
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}
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/*
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* Free the stack for the current thread
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*/
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void _st_stack_free(_st_stack_t *ts)
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{
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if (!ts) {
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return;
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}
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/* Put the stack on the free list */
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ST_APPEND_LINK(&ts->links, _st_free_stacks.prev);
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_st_num_free_stacks++;
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}
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static char *_st_new_stk_segment(int size)
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{
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#ifdef MALLOC_STACK
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void *vaddr = malloc(size);
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#else
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#error "Only Supports Malloc Stack"
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#endif
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return (char *)vaddr;
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}
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/* Not used */
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#if 0
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void _st_delete_stk_segment(char *vaddr, int size)
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{
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#ifdef MALLOC_STACK
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free(vaddr);
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#else
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#error Unknown Stack Malloc
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#endif
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}
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#endif
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int st_randomize_stacks(int on)
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{
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int wason = _st_randomize_stacks;
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_st_randomize_stacks = on;
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if (on) {
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srandom((unsigned int) st_utime());
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}
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return wason;
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}
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