From 6c6bf9ffcbfeb8be9d9c342e7604b74ec819e88a Mon Sep 17 00:00:00 2001 From: Samuel Williams Date: Mon, 24 Jun 2019 23:54:19 +1200 Subject: Add `ucontext` coroutine implementation for generic fallback. --- coroutine/win32/Context.h | 42 ++++++++++++++++++------------------------ 1 file changed, 18 insertions(+), 24 deletions(-) (limited to 'coroutine/win32') diff --git a/coroutine/win32/Context.h b/coroutine/win32/Context.h index 779a9a8938..fe1a8a3648 100644 --- a/coroutine/win32/Context.h +++ b/coroutine/win32/Context.h @@ -10,53 +10,47 @@ #include #include -#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)(struct coroutine_context *from, struct coroutine_context *self); -typedef void(__fastcall * coroutine_start)(coroutine_context *from, 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 -- cgit v1.2.3