58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* Copyright (c) 2015 , Moritz Bitsch
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef COROUTINE_H
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#define COROUTINE_H
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#include <stdlib.h>
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typedef struct _coroutine_context
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{
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int step;
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void *data;
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} coroutine_context;
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/* hack to fix MSVC edit and continue */
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#ifdef _MSC_VER
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#define __CORO_LINE_NO __COUNTER__ + 1
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#else
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#define __CORO_LINE_NO __LINE__
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#endif
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#define coroutine_data struct
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#define coroutine_data_end(c, name) *name = c->data; if (name == NULL) c->data = name = calloc(1, sizeof(*name))
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#define reenter(c) \
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coroutine_context* __coro_ctx = c; \
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switch (c->step)
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#define entry \
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extern void _coroutine_entry_label_enforcer(); \
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default: \
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abort(); \
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case -1: \
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coroutine_bail_out: break; \
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case 0
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#define yield \
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(void)&_coroutine_entry_label_enforcer; \
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__coro_ctx->step = __CORO_LINE_NO; \
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goto coroutine_bail_out; \
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case __CORO_LINE_NO:
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#define finish(c) do { (c)->step = -1; if ((c)->data) { free((c)->data); (c)->data = NULL; } } while (0)
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#endif
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