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/* |
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* Copyright (c) 2001-2011 Marc Alexander Lehmann <schmorp@schmorp.de> |
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* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* the GNU General Public License ("GPL") version 2 or any later version, |
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* in which case the provisions of the GPL are applicable instead of |
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* the above. If you wish to allow the use of your version of this file |
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* only under the terms of the GPL and not to allow others to use your |
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* version of this file under the BSD license, indicate your decision |
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* by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL. If you do not delete the |
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* provisions above, a recipient may use your version of this file under |
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* either the BSD or the GPL. |
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* |
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* This library is modelled strictly after Ralf S. Engelschalls article at |
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* http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
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* go to Ralf S. Engelschall <rse@engelschall.com>. |
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*/ |
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#include "coro.h" |
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#include <string.h> |
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/*****************************************************************************/ |
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/* ucontext/setjmp/asm backends */ |
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/*****************************************************************************/ |
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#if CORO_UCONTEXT || CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
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# if CORO_UCONTEXT |
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# include <stddef.h> |
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# endif |
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# if !defined(STACK_ADJUST_PTR) |
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# if __sgi |
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/* IRIX is decidedly NON-unix */ |
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# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
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# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) |
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# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) |
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# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
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# define STACK_ADJUST_SIZE(sp,ss) (ss) |
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# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) |
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# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
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# define STACK_ADJUST_SIZE(sp,ss) (ss) |
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# else |
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# define STACK_ADJUST_PTR(sp,ss) (sp) |
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# define STACK_ADJUST_SIZE(sp,ss) (ss) |
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# endif |
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# endif |
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# include <stdlib.h> |
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# if CORO_SJLJ |
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# include <stdio.h> |
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# include <signal.h> |
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# include <unistd.h> |
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# endif |
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static coro_func coro_init_func; |
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static void *coro_init_arg; |
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static coro_context *new_coro, *create_coro; |
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static void |
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coro_init (void) |
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{ |
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volatile coro_func func = coro_init_func; |
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volatile void *arg = coro_init_arg; |
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coro_transfer (new_coro, create_coro); |
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#if __linux && __amd64 |
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/* we blindly assume on any __linux with __amd64 we have a new enough gas with .cfi_undefined support */ |
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asm (".cfi_undefined rip"); |
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#endif |
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func ((void *)arg); |
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/* the new coro returned. bad. just abort() for now */ |
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abort (); |
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} |
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# if CORO_SJLJ |
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static volatile int trampoline_done; |
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/* trampoline signal handler */ |
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static void |
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trampoline (int sig) |
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{ |
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if (coro_setjmp (new_coro->env)) |
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coro_init (); /* start it */ |
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else |
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trampoline_done = 1; |
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} |
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# endif |
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# if CORO_ASM |
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#if _WIN32 |
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#define CORO_WIN_TIB 1 |
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#endif |
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asm ( |
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"\t.text\n" |
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"\t.globl coro_transfer\n" |
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"coro_transfer:\n" |
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/* windows, of course, gives a shit on the amd64 ABI and uses different registers */ |
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/* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */ |
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#if __amd64 |
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#ifdef WIN32 |
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/* TODO: xmm6..15 also would need to be saved. sigh. */ |
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#define NUM_SAVED 8 |
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"\tpushq %rsi\n" |
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"\tpushq %rdi\n" |
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"\tpushq %rbp\n" |
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"\tpushq %rbx\n" |
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"\tpushq %r12\n" |
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"\tpushq %r13\n" |
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"\tpushq %r14\n" |
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"\tpushq %r15\n" |
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#if CORO_WIN_TIB |
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"\tpushq %fs:0x0\n" |
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"\tpushq %fs:0x8\n" |
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"\tpushq %fs:0xc\n" |
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#endif |
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"\tmovq %rsp, (%rcx)\n" |
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"\tmovq (%rdx), %rsp\n" |
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#if CORO_WIN_TIB |
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"\tpopq %fs:0xc\n" |
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"\tpopq %fs:0x8\n" |
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"\tpopq %fs:0x0\n" |
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#endif |
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"\tpopq %r15\n" |
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"\tpopq %r14\n" |
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"\tpopq %r13\n" |
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"\tpopq %r12\n" |
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"\tpopq %rbx\n" |
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"\tpopq %rbp\n" |
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"\tpopq %rdi\n" |
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"\tpopq %rsi\n" |
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#else |
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#define NUM_SAVED 6 |
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"\tpushq %rbp\n" |
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"\tpushq %rbx\n" |
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"\tpushq %r12\n" |
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"\tpushq %r13\n" |
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"\tpushq %r14\n" |
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"\tpushq %r15\n" |
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"\tmovq %rsp, (%rdi)\n" |
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"\tmovq (%rsi), %rsp\n" |
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"\tpopq %r15\n" |
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"\tpopq %r14\n" |
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"\tpopq %r13\n" |
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"\tpopq %r12\n" |
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"\tpopq %rbx\n" |
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"\tpopq %rbp\n" |
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#endif |
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#elif __i386 |
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#define NUM_SAVED 4 |
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"\tpushl %ebp\n" |
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"\tpushl %ebx\n" |
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"\tpushl %esi\n" |
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"\tpushl %edi\n" |
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#if CORO_WIN_TIB |
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"\tpushl %fs:0\n" |
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"\tpushl %fs:4\n" |
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"\tpushl %fs:8\n" |
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#endif |
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"\tmovl %esp, (%eax)\n" |
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"\tmovl (%edx), %esp\n" |
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#if CORO_WIN_TIB |
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"\tpopl %fs:8\n" |
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"\tpopl %fs:4\n" |
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"\tpopl %fs:0\n" |
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#endif |
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"\tpopl %edi\n" |
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"\tpopl %esi\n" |
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"\tpopl %ebx\n" |
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"\tpopl %ebp\n" |
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#else |
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#error unsupported architecture |
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#endif |
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"\tret\n" |
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); |
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# endif |
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void |
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coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
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{ |
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coro_context nctx; |
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# if CORO_SJLJ |
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stack_t ostk, nstk; |
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struct sigaction osa, nsa; |
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sigset_t nsig, osig; |
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# endif |
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if (!coro) |
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return; |
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coro_init_func = coro; |
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coro_init_arg = arg; |
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new_coro = ctx; |
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create_coro = &nctx; |
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# if CORO_SJLJ |
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/* we use SIGUSR2. first block it, then fiddle with it. */ |
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sigemptyset (&nsig); |
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sigaddset (&nsig, SIGUSR2); |
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sigprocmask (SIG_BLOCK, &nsig, &osig); |
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nsa.sa_handler = trampoline; |
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sigemptyset (&nsa.sa_mask); |
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nsa.sa_flags = SA_ONSTACK; |
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if (sigaction (SIGUSR2, &nsa, &osa)) |
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{ |
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perror ("sigaction"); |
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abort (); |
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} |
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|
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/* set the new stack */ |
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nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */ |
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nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize); |
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nstk.ss_flags = 0; |
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if (sigaltstack (&nstk, &ostk) < 0) |
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{ |
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perror ("sigaltstack"); |
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abort (); |
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} |
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trampoline_done = 0; |
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kill (getpid (), SIGUSR2); |
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sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
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while (!trampoline_done) |
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sigsuspend (&nsig); |
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sigaltstack (0, &nstk); |
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nstk.ss_flags = SS_DISABLE; |
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if (sigaltstack (&nstk, 0) < 0) |
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perror ("sigaltstack"); |
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sigaltstack (0, &nstk); |
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if (~nstk.ss_flags & SS_DISABLE) |
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abort (); |
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if (~ostk.ss_flags & SS_DISABLE) |
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sigaltstack (&ostk, 0); |
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sigaction (SIGUSR2, &osa, 0); |
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sigprocmask (SIG_SETMASK, &osig, 0); |
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# elif CORO_LOSER |
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|
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coro_setjmp (ctx->env); |
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#if __CYGWIN__ && __i386 |
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ctx->env[8] = (long) coro_init; |
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ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
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#elif __CYGWIN__ && __x86_64 |
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ctx->env[7] = (long) coro_init; |
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ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
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#elif defined(__MINGW32__) |
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ctx->env[5] = (long) coro_init; |
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ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
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1.39 |
#elif defined(_M_IX86) |
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1.47 |
((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
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((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
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1.39 |
#elif defined(_M_AMD64) |
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1.47 |
((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
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((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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#elif defined(_M_IA64) |
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((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
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1.48 |
((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
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1.39 |
#else |
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#error "microsoft libc or architecture not supported" |
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#endif |
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1.4 |
|
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# elif CORO_LINUX |
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1.44 |
coro_setjmp (ctx->env); |
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1.39 |
#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
307 |
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1.47 |
ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
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ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
309 |
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1.39 |
#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
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ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
311 |
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1.47 |
ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
312 |
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1.39 |
#elif defined (__GNU_LIBRARY__) && defined (__i386__) |
313 |
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1.47 |
ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
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ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
315 |
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1.39 |
#elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
316 |
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1.47 |
ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
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ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
318 |
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1.39 |
#else |
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#error "linux libc or architecture not supported" |
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#endif |
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1.5 |
|
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# elif CORO_IRIX |
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|
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1.44 |
coro_setjmp (ctx->env, 0); |
325 |
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1.47 |
ctx->env[JB_PC] = (__uint64_t)coro_init; |
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ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
327 |
root |
1.1 |
|
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1.27 |
# elif CORO_ASM |
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1.41 |
ctx->sp = (void **)(ssize + (char *)sptr); |
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1.37 |
*--ctx->sp = (void *)abort; /* needed for alignment only */ |
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1.27 |
*--ctx->sp = (void *)coro_init; |
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|
334 |
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1.50 |
#if CORO_WIN_TIB |
335 |
root |
1.51 |
*--ctx->sp = 0; /* ExceptionList */ |
336 |
|
|
*--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
337 |
root |
1.50 |
*--ctx->sp = sptr; /* StackLimit */ |
338 |
|
|
#endif |
339 |
|
|
|
340 |
root |
1.51 |
ctx->sp -= NUM_SAVED; |
341 |
root |
1.55 |
memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED); |
342 |
root |
1.51 |
|
343 |
root |
1.39 |
# elif CORO_UCONTEXT |
344 |
|
|
|
345 |
|
|
getcontext (&(ctx->uc)); |
346 |
|
|
|
347 |
|
|
ctx->uc.uc_link = 0; |
348 |
|
|
ctx->uc.uc_stack.ss_sp = sptr; |
349 |
|
|
ctx->uc.uc_stack.ss_size = (size_t)ssize; |
350 |
|
|
ctx->uc.uc_stack.ss_flags = 0; |
351 |
|
|
|
352 |
|
|
makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
353 |
|
|
|
354 |
root |
1.1 |
# endif |
355 |
|
|
|
356 |
root |
1.39 |
coro_transfer (create_coro, new_coro); |
357 |
|
|
} |
358 |
|
|
|
359 |
|
|
/*****************************************************************************/ |
360 |
|
|
/* pthread backend */ |
361 |
|
|
/*****************************************************************************/ |
362 |
root |
1.40 |
#elif CORO_PTHREAD |
363 |
root |
1.1 |
|
364 |
root |
1.39 |
/* this mutex will be locked by the running coroutine */ |
365 |
|
|
pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
366 |
root |
1.30 |
|
367 |
root |
1.39 |
struct coro_init_args |
368 |
|
|
{ |
369 |
|
|
coro_func func; |
370 |
|
|
void *arg; |
371 |
|
|
coro_context *self, *main; |
372 |
|
|
}; |
373 |
|
|
|
374 |
|
|
static pthread_t null_tid; |
375 |
|
|
|
376 |
|
|
/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
377 |
|
|
static void |
378 |
|
|
mutex_unlock_wrapper (void *arg) |
379 |
|
|
{ |
380 |
|
|
pthread_mutex_unlock ((pthread_mutex_t *)arg); |
381 |
|
|
} |
382 |
|
|
|
383 |
|
|
static void * |
384 |
|
|
coro_init (void *args_) |
385 |
|
|
{ |
386 |
|
|
struct coro_init_args *args = (struct coro_init_args *)args_; |
387 |
|
|
coro_func func = args->func; |
388 |
|
|
void *arg = args->arg; |
389 |
|
|
|
390 |
|
|
pthread_mutex_lock (&coro_mutex); |
391 |
|
|
|
392 |
|
|
/* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
393 |
|
|
pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
394 |
|
|
coro_transfer (args->self, args->main); |
395 |
|
|
func (arg); |
396 |
|
|
pthread_cleanup_pop (1); |
397 |
|
|
|
398 |
|
|
return 0; |
399 |
|
|
} |
400 |
|
|
|
401 |
|
|
void |
402 |
|
|
coro_transfer (coro_context *prev, coro_context *next) |
403 |
|
|
{ |
404 |
|
|
pthread_cond_signal (&next->cv); |
405 |
|
|
pthread_cond_wait (&prev->cv, &coro_mutex); |
406 |
root |
1.43 |
#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
407 |
|
|
pthread_testcancel (); |
408 |
|
|
#endif |
409 |
root |
1.39 |
} |
410 |
|
|
|
411 |
|
|
void |
412 |
|
|
coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
413 |
|
|
{ |
414 |
root |
1.38 |
static coro_context nctx; |
415 |
root |
1.30 |
static int once; |
416 |
|
|
|
417 |
|
|
if (!once) |
418 |
|
|
{ |
419 |
root |
1.38 |
once = 1; |
420 |
|
|
|
421 |
root |
1.30 |
pthread_mutex_lock (&coro_mutex); |
422 |
root |
1.38 |
pthread_cond_init (&nctx.cv, 0); |
423 |
|
|
null_tid = pthread_self (); |
424 |
root |
1.30 |
} |
425 |
|
|
|
426 |
root |
1.38 |
pthread_cond_init (&ctx->cv, 0); |
427 |
root |
1.30 |
|
428 |
root |
1.38 |
if (coro) |
429 |
|
|
{ |
430 |
|
|
pthread_attr_t attr; |
431 |
|
|
struct coro_init_args args; |
432 |
|
|
|
433 |
|
|
args.func = coro; |
434 |
|
|
args.arg = arg; |
435 |
|
|
args.self = ctx; |
436 |
|
|
args.main = &nctx; |
437 |
|
|
|
438 |
|
|
pthread_attr_init (&attr); |
439 |
root |
1.53 |
#if __UCLIBC__ |
440 |
root |
1.54 |
/* exists, but is borked */ |
441 |
|
|
/*pthread_attr_setstacksize (&attr, (size_t)ssize);*/ |
442 |
root |
1.53 |
#else |
443 |
root |
1.38 |
pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
444 |
root |
1.53 |
#endif |
445 |
root |
1.38 |
pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
446 |
root |
1.39 |
pthread_create (&ctx->id, &attr, coro_init, &args); |
447 |
root |
1.38 |
|
448 |
|
|
coro_transfer (args.main, args.self); |
449 |
|
|
} |
450 |
|
|
else |
451 |
|
|
ctx->id = null_tid; |
452 |
root |
1.39 |
} |
453 |
|
|
|
454 |
|
|
void |
455 |
|
|
coro_destroy (coro_context *ctx) |
456 |
|
|
{ |
457 |
|
|
if (!pthread_equal (ctx->id, null_tid)) |
458 |
|
|
{ |
459 |
|
|
pthread_cancel (ctx->id); |
460 |
|
|
pthread_mutex_unlock (&coro_mutex); |
461 |
|
|
pthread_join (ctx->id, 0); |
462 |
|
|
pthread_mutex_lock (&coro_mutex); |
463 |
|
|
} |
464 |
|
|
|
465 |
|
|
pthread_cond_destroy (&ctx->cv); |
466 |
|
|
} |
467 |
root |
1.30 |
|
468 |
root |
1.40 |
#else |
469 |
|
|
# error unsupported backend |
470 |
root |
1.1 |
#endif |
471 |
|
|
|