Ruby: wasm/fiber.h Source File

Ruby 4.0.6p0 (2026-07-14 revision 03b6d3f8898a28604fe6cb00eae3226b821168f4)

fiber.h
1#ifndef RB_WASM_SUPPORT_FIBER_H
2#define RB_WASM_SUPPORT_FIBER_H
3
4#include <stdbool.h>
5
6#ifndef WASM_FIBER_STACK_BUFFER_SIZE
7# define WASM_FIBER_STACK_BUFFER_SIZE 6144
8#endif
9
10 struct __rb_wasm_asyncify_fiber_ctx {
11 void* top;
12 void* end;
13 char buffer[WASM_FIBER_STACK_BUFFER_SIZE];
14};
15
16// Fiber execution context needed to perform context switch
17 typedef struct {
18 // Fiber entry point called when the fiber started for the first time.
19 // NULL if the entry point is main
20 void (*entry_point)(void *, void *);
21 // Opaque argument pointers passed to the entry point function
22 void *arg0, *arg1;
23
24 // Internal asyncify buffer space
25 struct __rb_wasm_asyncify_fiber_ctx asyncify_buf;
26
27 bool is_rewinding;
28 bool is_started;
29} rb_wasm_fiber_context;
30
31// Initialize a given fiber context to be ready to pass to `rb_wasm_swapcontext`
32void rb_wasm_init_context(rb_wasm_fiber_context *fcp, void (*func)(void *, void *), void *arg0, void *arg1);
33
34// Swap the execution control with `target_fiber` and save the current context in `old_fiber`
35// NOTE: `old_fiber` must be the current executing fiber context
36void rb_wasm_swapcontext(rb_wasm_fiber_context *old_fiber, rb_wasm_fiber_context *target_fiber);
37
38// Returns the Asyncify buffer of next fiber if unwound for fiber context switch.
39// Used by the top level Asyncify handling in wasm/runtime.c
40void *rb_wasm_handle_fiber_unwind(void (**new_fiber_entry)(void *, void *),
41 void **arg0, void **arg1, bool *is_new_fiber_started);
42
43#endif
stdbool.h
C99 shim for <stdbool.h>.
__rb_wasm_asyncify_fiber_ctx
Definition fiber.h:10
rb_wasm_fiber_context
Definition fiber.h:17