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Add ucontext coroutine implementation for generic fallback.

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This commit is contained in:
Samuel Williams 2019-06-24 23:54:19 +12:00
parent a84a99ffab
commit 6c6bf9ffcb
13 changed files with 211 additions and 174 deletions
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42
coroutine/win32/Context.h
View file

@ -10,53 +10,47 @@
#include <assert.h>
#include <string.h>
#if __cplusplus
extern "C" {
#endif
#define COROUTINE __declspec(noreturn) void __fastcall
/* This doesn't include thread information block */
enum {COROUTINE_REGISTERS = 4};
typedef struct
struct coroutine_context
{
void **stack_pointer;
} coroutine_context;
};
typedef void(__fastcall * coroutine_start)(coroutine_context *from, coroutine_context *self);
typedef void(__fastcall * coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
static inline void coroutine_initialize_main(struct coroutine_context * context) {
context->stack_pointer = NULL;
}
static inline void coroutine_initialize(
coroutine_context *context,
struct coroutine_context *context,
coroutine_start start,
void *stack_pointer,
size_t stack_size
void *stack,
size_t size
) {
context->stack_pointer = (void**)stack_pointer;
assert(start && stack && size >= 1024);
if (!start) {
assert(!context->stack_pointer);
/* We are main coroutine for this thread */
return;
}
// Stack grows down. Force 16-byte alignment.
char * top = (char*)stack + size;
context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
*--context->stack_pointer = (void*)start;
/* Windows Thread Information Block */
*--context->stack_pointer = 0; /* fs:[0] */
*--context->stack_pointer = (void*)stack_pointer; /* fs:[4] */
*--context->stack_pointer = (void*)((char *)stack_pointer - stack_size); /* fs:[8] */
*--context->stack_pointer = (void*)top; /* fs:[4] */
*--context->stack_pointer = (void*)stack; /* fs:[8] */
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
}
coroutine_context * __fastcall coroutine_transfer(coroutine_context * current, coroutine_context * target);
struct coroutine_context * __fastcall coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
static inline void coroutine_destroy(coroutine_context * context)
static inline void coroutine_destroy(struct coroutine_context * context)
{
}
#if __cplusplus
}
#endif