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/*
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* CoroX.c
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* Coroutines for Mac OS X
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*
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* Created by Jens Alfke on 4/29/08.
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* Adapted from Steve Dekorte's libCoroutine:
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* <http://www.dekorte.com/projects/opensource/libCoroutine/>
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* by putting it on a piece of wood and banging a few nails through it.
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* No, actually I removed all the stuff for cross-platform support, leaving only the simple
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* code that works on Mac OS X 10.5, and then cleaned things up a bit.
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*
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* Copyright 2008 Jens Alfke. All rights reserved.
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* Copyright (c) 2002, 2003 Steve Dekorte. All rights reserved.
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* License is at the bottom of this file.
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*
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*/
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#include "CoroX.h"
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#include <ucontext.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <assert.h>
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#define CORO_DEFAULT_STACK_SIZE (65536*4)
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#define CORO_STACK_SIZE_MIN 8192
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struct Coro
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{
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size_t stackSize;
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void *stack;
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ucontext_t env;
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// The following field works around bug(?) in sys/_structs.h. This field should be part of ucontext_t:
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_STRUCT_MCONTEXT env_registers;
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unsigned char isMain;
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};
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typedef struct CallbackBlock
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{
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void *context;
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CoroStartCallback *func;
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} CallbackBlock;
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Coro *Coro_new(void)
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{
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Coro *self = (Coro *)calloc(1, sizeof(Coro));
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self->stackSize = CORO_DEFAULT_STACK_SIZE;
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self->stack = NULL;
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return self;
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}
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void Coro_free(Coro *self)
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{
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if (self->stack)
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free(self->stack);
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free(self);
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}
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void *Coro_stack(Coro *self)
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{
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return self->stack;
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}
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size_t Coro_stackSize(Coro *self)
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{
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return self->stackSize;
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}
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void Coro_setStackSize_(Coro *self, size_t sizeInBytes)
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{
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self->stackSize = sizeInBytes;
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}
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uint8_t *Coro_CurrentStackPointer(void) __attribute__ ((noinline));
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uint8_t *Coro_CurrentStackPointer(void)
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{
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uint8_t a;
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uint8_t *b = &a;
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return b;
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}
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size_t Coro_bytesLeftOnStack(Coro *self)
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{
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uint8_t dummy;
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ptrdiff_t p1 = (ptrdiff_t)(&dummy);
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ptrdiff_t p2 = (ptrdiff_t)Coro_CurrentStackPointer();
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int stackMovesUp = p2 > p1;
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ptrdiff_t start = ((ptrdiff_t)self->stack);
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ptrdiff_t end = start + self->stackSize;
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if (stackMovesUp)
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{
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return end - p1;
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}
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else
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{
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return p1 - start;
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}
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}
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int Coro_stackSpaceAlmostGone(Coro *self)
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{
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return Coro_bytesLeftOnStack(self) < CORO_STACK_SIZE_MIN;
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}
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void Coro_initializeMainCoro(Coro *self)
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{
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self->isMain = 1;
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}
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static void Coro_StartWithArg(CallbackBlock *block)
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{
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(block->func)(block->context);
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fprintf(stderr,"CoroX error: returned from coro start function\n");
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abort();
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}
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typedef void (*makecontext_func)(void);
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static void Coro_setup(Coro *self, void *arg)
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{
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ucontext_t *ucp = (ucontext_t *) &self->env;
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getcontext(ucp);
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ucp->uc_stack.ss_sp = Coro_stack(self);
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ucp->uc_stack.ss_size = Coro_stackSize(self);
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ucp->uc_stack.ss_flags = 0;
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ucp->uc_link = NULL;
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makecontext(ucp, (makecontext_func)Coro_StartWithArg, 1, arg);
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}
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void Coro_startCoro_(Coro *self, Coro *other, void *context, CoroStartCallback *callback)
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{
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assert(other->stack==NULL);
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other->stack = calloc(1, other->stackSize + 16);
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CallbackBlock callbackBlock = {context,callback};
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Coro_setup(other, &callbackBlock);
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Coro_switchTo_(self, other);
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}
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void Coro_switchTo_(Coro *self, Coro *next)
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{
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swapcontext(&self->env, &next->env);
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}
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/*
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(This is a BSD License)
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Copyright (c) 2002, 2003 Steve Dekorte
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Copyright (c) 2008 Jens Alfke
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are
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permitted provided that the following conditions are met:
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• Redistributions of source code must retain the above copyright notice, this list of
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conditions and the following disclaimer.
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• Redistributions in binary form must reproduce the above copyright notice, this list
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of conditions and the following disclaimer in the documentation and/or other materials
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provided with the distribution.
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• Neither the name of the author nor the names of other contributors may be used to
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endorse or promote products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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