Ruby  3.4.0dev (2024-11-06 revision 4120f2babd7924a31c6d685be2429492af5c19b9)
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 
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
26 
27  bool is_rewinding;
28  bool is_started;
30 
31 // Initialize a given fiber context to be ready to pass to `rb_wasm_swapcontext`
32 void 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
36 void 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
40 void *rb_wasm_handle_fiber_unwind(void (**new_fiber_entry)(void *, void *),
41  void **arg0, void **arg1, bool *is_new_fiber_started);
42 
43 #endif
C99 shim for <stdbool.h>