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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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|
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#include "coro.h" |
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|
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#include <stddef.h> |
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#include <string.h> |
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|
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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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|
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# if CORO_UCONTEXT |
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# include <stddef.h> |
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# endif |
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|
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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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|
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# include <stdlib.h> |
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|
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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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|
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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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|
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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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|
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coro_transfer (new_coro, create_coro); |
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|
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#if __GCC_HAVE_DWARF2_CFI_ASM && __amd64 |
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asm (".cfi_undefined rip"); |
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#endif |
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|
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func ((void *)arg); |
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|
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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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|
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# if CORO_SJLJ |
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|
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static volatile int trampoline_done; |
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|
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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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|
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# endif |
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|
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# if CORO_ASM |
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|
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#if _WIN32 || __CYGWIN__ |
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#define CORO_WIN_TIB 1 |
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#endif |
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|
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asm ( |
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"\t.text\n" |
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#if _WIN32 || __CYGWIN__ |
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"\t.globl _coro_transfer\n" |
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"_coro_transfer:\n" |
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#else |
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"\t.globl coro_transfer\n" |
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"coro_transfer:\n" |
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#endif |
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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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|
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#if _WIN32 || __CYGWIN__ |
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#define NUM_SAVED 29 |
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"\tsubq $168, %rsp\t" /* one dummy qword to improve alignment */ |
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"\tmovaps %xmm6, (%rsp)\n" |
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"\tmovaps %xmm7, 16(%rsp)\n" |
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"\tmovaps %xmm8, 32(%rsp)\n" |
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"\tmovaps %xmm9, 48(%rsp)\n" |
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"\tmovaps %xmm10, 64(%rsp)\n" |
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"\tmovaps %xmm11, 80(%rsp)\n" |
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"\tmovaps %xmm12, 96(%rsp)\n" |
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"\tmovaps %xmm13, 112(%rsp)\n" |
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"\tmovaps %xmm14, 128(%rsp)\n" |
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"\tmovaps %xmm15, 144(%rsp)\n" |
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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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"\tmovaps (%rsp), %xmm6\n" |
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"\tmovaps 16(%rsp), %xmm7\n" |
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"\tmovaps 32(%rsp), %xmm8\n" |
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"\tmovaps 48(%rsp), %xmm9\n" |
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"\tmovaps 64(%rsp), %xmm10\n" |
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"\tmovaps 80(%rsp), %xmm11\n" |
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"\tmovaps 96(%rsp), %xmm12\n" |
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"\tmovaps 112(%rsp), %xmm13\n" |
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"\tmovaps 128(%rsp), %xmm14\n" |
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"\tmovaps 144(%rsp), %xmm15\n" |
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"\taddq $168, %rsp\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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"\tpopq %rcx\n" |
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"\tjmpq *%rcx\n" |
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|
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#elif __i386 |
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|
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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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#undef NUM_SAVED |
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#define NUM_SAVED 7 |
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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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"\tpopl %ecx\n" |
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"\tjmpl *%ecx\n" |
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|
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#else |
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#error unsupported architecture |
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#endif |
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); |
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|
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# endif |
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|
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void |
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coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, size_t 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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|
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if (!coro) |
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return; |
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|
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coro_init_func = coro; |
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coro_init_arg = arg; |
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|
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new_coro = ctx; |
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create_coro = &nctx; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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while (!trampoline_done) |
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sigsuspend (&nsig); |
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|
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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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|
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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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|
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if (~ostk.ss_flags & SS_DISABLE) |
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sigaltstack (&ostk, 0); |
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|
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sigaction (SIGUSR2, &osa, 0); |
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sigprocmask (SIG_SETMASK, &osig, 0); |
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|
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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); |
| 319 |
#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); |
| 322 |
#elif defined __MINGW32__ |
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ctx->env[5] = (long) coro_init; |
| 324 |
ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
| 325 |
#elif defined _M_IX86 |
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((_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); |
| 328 |
#elif defined _M_AMD64 |
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((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
| 330 |
((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
| 331 |
#elif defined _M_IA64 |
| 332 |
((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
| 333 |
((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
| 334 |
#else |
| 335 |
#error "microsoft libc or architecture not supported" |
| 336 |
#endif |
| 337 |
|
| 338 |
# elif CORO_LINUX |
| 339 |
|
| 340 |
coro_setjmp (ctx->env); |
| 341 |
#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
| 342 |
ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
| 343 |
ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
| 344 |
#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
| 345 |
ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
| 346 |
ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
| 347 |
#elif defined (__GNU_LIBRARY__) && defined (__i386__) |
| 348 |
ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
| 349 |
ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
| 350 |
#elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
| 351 |
ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
| 352 |
ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
| 353 |
#else |
| 354 |
#error "linux libc or architecture not supported" |
| 355 |
#endif |
| 356 |
|
| 357 |
# elif CORO_IRIX |
| 358 |
|
| 359 |
coro_setjmp (ctx->env, 0); |
| 360 |
ctx->env[JB_PC] = (__uint64_t)coro_init; |
| 361 |
ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
| 362 |
|
| 363 |
# elif CORO_ASM |
| 364 |
|
| 365 |
ctx->sp = (void **)(ssize + (char *)sptr); |
| 366 |
*--ctx->sp = (void *)abort; /* needed for alignment only */ |
| 367 |
*--ctx->sp = (void *)coro_init; |
| 368 |
|
| 369 |
#if CORO_WIN_TIB |
| 370 |
*--ctx->sp = 0; /* ExceptionList */ |
| 371 |
*--ctx->sp = (char *)sptr + ssize; /* StackBase */ |
| 372 |
*--ctx->sp = sptr; /* StackLimit */ |
| 373 |
#endif |
| 374 |
|
| 375 |
ctx->sp -= NUM_SAVED; |
| 376 |
memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED); |
| 377 |
|
| 378 |
# elif CORO_UCONTEXT |
| 379 |
|
| 380 |
getcontext (&(ctx->uc)); |
| 381 |
|
| 382 |
ctx->uc.uc_link = 0; |
| 383 |
ctx->uc.uc_stack.ss_sp = sptr; |
| 384 |
ctx->uc.uc_stack.ss_size = (size_t)ssize; |
| 385 |
ctx->uc.uc_stack.ss_flags = 0; |
| 386 |
|
| 387 |
makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
| 388 |
|
| 389 |
# endif |
| 390 |
|
| 391 |
coro_transfer (create_coro, new_coro); |
| 392 |
} |
| 393 |
|
| 394 |
/*****************************************************************************/ |
| 395 |
/* pthread backend */ |
| 396 |
/*****************************************************************************/ |
| 397 |
#elif CORO_PTHREAD |
| 398 |
|
| 399 |
/* this mutex will be locked by the running coroutine */ |
| 400 |
pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 401 |
|
| 402 |
struct coro_init_args |
| 403 |
{ |
| 404 |
coro_func func; |
| 405 |
void *arg; |
| 406 |
coro_context *self, *main; |
| 407 |
}; |
| 408 |
|
| 409 |
static pthread_t null_tid; |
| 410 |
|
| 411 |
/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
| 412 |
static void |
| 413 |
mutex_unlock_wrapper (void *arg) |
| 414 |
{ |
| 415 |
pthread_mutex_unlock ((pthread_mutex_t *)arg); |
| 416 |
} |
| 417 |
|
| 418 |
static void * |
| 419 |
coro_init (void *args_) |
| 420 |
{ |
| 421 |
struct coro_init_args *args = (struct coro_init_args *)args_; |
| 422 |
coro_func func = args->func; |
| 423 |
void *arg = args->arg; |
| 424 |
|
| 425 |
pthread_mutex_lock (&coro_mutex); |
| 426 |
|
| 427 |
/* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
| 428 |
pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
| 429 |
coro_transfer (args->self, args->main); |
| 430 |
func (arg); |
| 431 |
pthread_cleanup_pop (1); |
| 432 |
|
| 433 |
return 0; |
| 434 |
} |
| 435 |
|
| 436 |
void |
| 437 |
coro_transfer (coro_context *prev, coro_context *next) |
| 438 |
{ |
| 439 |
pthread_cond_signal (&next->cv); |
| 440 |
pthread_cond_wait (&prev->cv, &coro_mutex); |
| 441 |
#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
| 442 |
pthread_testcancel (); |
| 443 |
#endif |
| 444 |
} |
| 445 |
|
| 446 |
void |
| 447 |
coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, size_t ssize) |
| 448 |
{ |
| 449 |
static coro_context nctx; |
| 450 |
static int once; |
| 451 |
|
| 452 |
if (!once) |
| 453 |
{ |
| 454 |
once = 1; |
| 455 |
|
| 456 |
pthread_mutex_lock (&coro_mutex); |
| 457 |
pthread_cond_init (&nctx.cv, 0); |
| 458 |
null_tid = pthread_self (); |
| 459 |
} |
| 460 |
|
| 461 |
pthread_cond_init (&ctx->cv, 0); |
| 462 |
|
| 463 |
if (coro) |
| 464 |
{ |
| 465 |
pthread_attr_t attr; |
| 466 |
struct coro_init_args args; |
| 467 |
|
| 468 |
args.func = coro; |
| 469 |
args.arg = arg; |
| 470 |
args.self = ctx; |
| 471 |
args.main = &nctx; |
| 472 |
|
| 473 |
pthread_attr_init (&attr); |
| 474 |
#if __UCLIBC__ |
| 475 |
/* exists, but is borked */ |
| 476 |
/*pthread_attr_setstacksize (&attr, (size_t)ssize);*/ |
| 477 |
#elif __CYGWIN__ |
| 478 |
/* POSIX, not here */ |
| 479 |
pthread_attr_setstacksize (&attr, (size_t)ssize); |
| 480 |
#else |
| 481 |
pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
| 482 |
#endif |
| 483 |
pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
| 484 |
pthread_create (&ctx->id, &attr, coro_init, &args); |
| 485 |
|
| 486 |
coro_transfer (args.main, args.self); |
| 487 |
} |
| 488 |
else |
| 489 |
ctx->id = null_tid; |
| 490 |
} |
| 491 |
|
| 492 |
void |
| 493 |
coro_destroy (coro_context *ctx) |
| 494 |
{ |
| 495 |
if (!pthread_equal (ctx->id, null_tid)) |
| 496 |
{ |
| 497 |
pthread_cancel (ctx->id); |
| 498 |
pthread_mutex_unlock (&coro_mutex); |
| 499 |
pthread_join (ctx->id, 0); |
| 500 |
pthread_mutex_lock (&coro_mutex); |
| 501 |
} |
| 502 |
|
| 503 |
pthread_cond_destroy (&ctx->cv); |
| 504 |
} |
| 505 |
|
| 506 |
/*****************************************************************************/ |
| 507 |
/* fiber backend */ |
| 508 |
/*****************************************************************************/ |
| 509 |
#elif CORO_FIBER |
| 510 |
|
| 511 |
#define WIN32_LEAN_AND_MEAN |
| 512 |
#if _WIN32_WINNT < 0x0400 |
| 513 |
#undef _WIN32_WINNT |
| 514 |
#define _WIN32_WINNT 0x0400 |
| 515 |
#endif |
| 516 |
#include <windows.h> |
| 517 |
|
| 518 |
VOID CALLBACK |
| 519 |
coro_init (PVOID arg) |
| 520 |
{ |
| 521 |
coro_context *ctx = (coro_context *)arg; |
| 522 |
|
| 523 |
ctx->coro (ctx->arg); |
| 524 |
} |
| 525 |
|
| 526 |
void |
| 527 |
coro_transfer (coro_context *prev, coro_context *next) |
| 528 |
{ |
| 529 |
if (!prev->fiber) |
| 530 |
{ |
| 531 |
prev->fiber = GetCurrentFiber (); |
| 532 |
|
| 533 |
if (prev->fiber == 0 || prev->fiber == (void *)0x1e00) |
| 534 |
prev->fiber = ConvertThreadToFiber (0); |
| 535 |
} |
| 536 |
|
| 537 |
SwitchToFiber (next->fiber); |
| 538 |
} |
| 539 |
|
| 540 |
void |
| 541 |
coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, size_t ssize) |
| 542 |
{ |
| 543 |
ctx->fiber = 0; |
| 544 |
ctx->coro = coro; |
| 545 |
ctx->arg = arg; |
| 546 |
|
| 547 |
if (!coro) |
| 548 |
return; |
| 549 |
|
| 550 |
ctx->fiber = CreateFiber (ssize, coro_init, ctx); |
| 551 |
} |
| 552 |
|
| 553 |
void |
| 554 |
coro_destroy (coro_context *ctx) |
| 555 |
{ |
| 556 |
DeleteFiber (ctx->fiber); |
| 557 |
} |
| 558 |
|
| 559 |
#else |
| 560 |
#error unsupported backend |
| 561 |
#endif |
| 562 |
|
| 563 |
/*****************************************************************************/ |
| 564 |
/* stack management */ |
| 565 |
/*****************************************************************************/ |
| 566 |
#if CORO_STACKALLOC |
| 567 |
|
| 568 |
#include <stdlib.h> |
| 569 |
|
| 570 |
#ifndef _WIN32 |
| 571 |
# include <unistd.h> |
| 572 |
#endif |
| 573 |
|
| 574 |
#if CORO_USE_VALGRIND |
| 575 |
# include <valgrind/valgrind.h> |
| 576 |
#endif |
| 577 |
|
| 578 |
#if _POSIX_MAPPED_FILES |
| 579 |
# include <sys/mman.h> |
| 580 |
# define CORO_MMAP 1 |
| 581 |
# ifndef MAP_ANONYMOUS |
| 582 |
# ifdef MAP_ANON |
| 583 |
# define MAP_ANONYMOUS MAP_ANON |
| 584 |
# else |
| 585 |
# undef CORO_MMAP |
| 586 |
# endif |
| 587 |
# endif |
| 588 |
# include <limits.h> |
| 589 |
#else |
| 590 |
# undef CORO_MMAP |
| 591 |
#endif |
| 592 |
|
| 593 |
#if _POSIX_MEMORY_PROTECTION |
| 594 |
# ifndef CORO_GUARDPAGES |
| 595 |
# define CORO_GUARDPAGES 4 |
| 596 |
# endif |
| 597 |
#else |
| 598 |
# undef CORO_GUARDPAGES |
| 599 |
#endif |
| 600 |
|
| 601 |
#if !CORO_MMAP |
| 602 |
# undef CORO_GUARDPAGES |
| 603 |
#endif |
| 604 |
|
| 605 |
#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64 |
| 606 |
# undef CORO_GUARDPAGES |
| 607 |
#endif |
| 608 |
|
| 609 |
#ifndef CORO_GUARDPAGES |
| 610 |
# define CORO_GUARDPAGES 0 |
| 611 |
#endif |
| 612 |
|
| 613 |
#if !PAGESIZE |
| 614 |
#if !CORO_MMAP |
| 615 |
#define PAGESIZE 4096 |
| 616 |
#else |
| 617 |
static size_t |
| 618 |
coro_pagesize (void) |
| 619 |
{ |
| 620 |
static size_t pagesize; |
| 621 |
|
| 622 |
if (!pagesize) |
| 623 |
pagesize = sysconf (_SC_PAGESIZE); |
| 624 |
|
| 625 |
return pagesize; |
| 626 |
} |
| 627 |
|
| 628 |
#define PAGESIZE coro_pagesize () |
| 629 |
#endif |
| 630 |
#endif |
| 631 |
|
| 632 |
int |
| 633 |
coro_stack_alloc (struct coro_stack *stack, unsigned int size) |
| 634 |
{ |
| 635 |
if (!size) |
| 636 |
size = 256 * 1024; |
| 637 |
|
| 638 |
stack->sptr = 0; |
| 639 |
stack->ssze = ((size_t)size * sizeof (void *) + PAGESIZE - 1) / PAGESIZE * PAGESIZE; |
| 640 |
|
| 641 |
#if CORO_FIBER |
| 642 |
|
| 643 |
stack->sptr = (void *)stack; |
| 644 |
return 1; |
| 645 |
|
| 646 |
#else |
| 647 |
|
| 648 |
size_t ssze = stack->ssze + CORO_GUARDPAGES * PAGESIZE; |
| 649 |
void *base; |
| 650 |
|
| 651 |
#if CORO_MMAP |
| 652 |
/* mmap supposedly does allocate-on-write for us */ |
| 653 |
base = mmap (0, ssze, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 654 |
|
| 655 |
if (base == (void *)-1) |
| 656 |
{ |
| 657 |
/* some systems don't let us have executable heap */ |
| 658 |
/* we assume they won't need executable stack in that case */ |
| 659 |
base = mmap (0, ssze, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 660 |
|
| 661 |
if (base == (void *)-1) |
| 662 |
return 0; |
| 663 |
} |
| 664 |
|
| 665 |
#if CORO_GUARDPAGES |
| 666 |
mprotect (base, CORO_GUARDPAGES * PAGESIZE, PROT_NONE); |
| 667 |
#endif |
| 668 |
|
| 669 |
base = (void*)((char *)base + CORO_GUARDPAGES * PAGESIZE); |
| 670 |
#else |
| 671 |
base = malloc (ssze); |
| 672 |
if (!base) |
| 673 |
return 0; |
| 674 |
#endif |
| 675 |
|
| 676 |
#if CORO_USE_VALGRIND |
| 677 |
stack->valgrind_id = VALGRIND_STACK_REGISTER ((char *)base, (char *)ssze - CORO_GUARDPAGES * PAGESIZE); |
| 678 |
#endif |
| 679 |
|
| 680 |
stack->sptr = base; |
| 681 |
return 1; |
| 682 |
|
| 683 |
#endif |
| 684 |
} |
| 685 |
|
| 686 |
void |
| 687 |
coro_stack_free (struct coro_stack *stack) |
| 688 |
{ |
| 689 |
#if CORO_FIBER |
| 690 |
/* nop */ |
| 691 |
#else |
| 692 |
#if CORO_USE_VALGRIND |
| 693 |
VALGRIND_STACK_DEREGISTER (stack->valgrind_id); |
| 694 |
#endif |
| 695 |
|
| 696 |
#if CORO_MMAP |
| 697 |
if (stack->sptr) |
| 698 |
munmap ((void*)((char *)stack->sptr - CORO_GUARDPAGES * PAGESIZE), |
| 699 |
stack->ssze + CORO_GUARDPAGES * PAGESIZE); |
| 700 |
#else |
| 701 |
free (stack->sptr); |
| 702 |
#endif |
| 703 |
#endif |
| 704 |
} |
| 705 |
|
| 706 |
#endif |
| 707 |
|
