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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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2
coroutine/amd64/Context.S
View file

@ -27,7 +27,7 @@ PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
# Restore callee stack pointer
movq (%rsi), %rsp
# Restore callee stack
# Restore callee state
popq %r15
popq %r14
popq %r13

39
coroutine/amd64/Context.h
View file

@ -10,35 +10,32 @@
#include <assert.h>
#include <string.h>
#if __cplusplus
extern "C" {
#endif
#define COROUTINE __attribute__((noreturn)) void
enum {COROUTINE_REGISTERS = 6};
typedef struct
struct coroutine_context
{
void **stack_pointer;
} coroutine_context;
};
typedef COROUTINE(* coroutine_start)(coroutine_context *from, coroutine_context *self);
typedef COROUTINE(* 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
) {
/* Force 16-byte alignment */
context->stack_pointer = (void**)((uintptr_t)stack_pointer & ~0xF);
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 = NULL;
*--context->stack_pointer = (void*)start;
@ -47,13 +44,9 @@ static inline void coroutine_initialize(
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
}
coroutine_context * coroutine_transfer(coroutine_context * current, coroutine_context * target);
struct coroutine_context * 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)
{
context->stack_pointer = NULL;
}
#if __cplusplus
}
#endif