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Diffstat (limited to 'coroutine/amd64/Context.h')
-rw-r--r-- | coroutine/amd64/Context.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/coroutine/amd64/Context.h b/coroutine/amd64/Context.h new file mode 100644 index 0000000000..fa5819e115 --- /dev/null +++ b/coroutine/amd64/Context.h @@ -0,0 +1,62 @@ +// +// amd64.h +// File file is part of the "Coroutine" project and released under the MIT License. +// +// Created by Samuel Williams on 10/5/2018. +// Copyright, 2018, by Samuel Williams. All rights reserved. +// + +#pragma once + +#include <assert.h> +#include <string.h> + +#if __cplusplus +extern "C" { +#endif + +#define COROUTINE __attribute__((noreturn)) void + +const size_t COROUTINE_REGISTERS = 6; + +// The fiber context (stack pointer). +typedef struct +{ + void **stack_pointer; +} coroutine_context; + +// The initialization function. +typedef void(* coroutine_start)(coroutine_context *from, coroutine_context *self); + +inline void coroutine_initialize( + coroutine_context *context, + coroutine_start start, + void *stack_pointer, + size_t stack_size +) { + /* Force 16-byte alignment */ + context->stack_pointer = (void**)((uintptr_t)stack_pointer & ~0xF); + + if (!start) { + assert(!context->stack_pointer); + /* We are main coroutine for this thread */ + return; + } + + *--context->stack_pointer = NULL; + *--context->stack_pointer = (void*)start; + + context->stack_pointer -= COROUTINE_REGISTERS; + memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS); +} + +coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target); + +inline void coroutine_destroy(coroutine_context * context) +{ + context->stack_pointer = NULL; +} + +#if __cplusplus +} +#endif |