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83f684c66c
byuu says: Note: for Windows users, please go to nall/intrinsics.hpp line 60 and correct the typo from "DISPLAY_WINDOW" to "DISPLAY_WINDOWS" before compiling, otherwise things won't work at all. This will be a really major WIP for the core SNES emulation, so please test as thoroughly as possible. I rewrote the 65816 CPU core's dispatcher from a jump table to a switch table. This was so that I could pass class variables as parameters to opcodes without crazy theatrics. With that, I killed the regs.r[N] stuff, the flag_t operator|=, &=, ^= stuff, and all of the template versions of opcodes. I also removed some stupid pointless flag tests in xcn and pflag that would always be true. I sure hope that AWJ is happy with this; because this change was so that my flag assignments and branch tests won't need to build regs.P into a full 8-bit variable anymore. It does of course incur a slight performance hit when you pass in variables by-value to functions, but it should help with binary size (and thus cache) by reducing a lot of extra functions. (I know I could have used template parameters for some things even with a switch table, but chose not to for the aforementioned reasons.) Overall, it's about a ~1% speedup from the previous build. The CPU core instructions were never a bottleneck, but I did want to fix the P flag building stuff because that really was a dumb mistake v_v'
104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/*
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libco.sjlj (2008-01-28)
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author: Nach
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license: public domain
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*/
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/*
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* Note this was designed for UNIX systems. Based on ideas expressed in a paper
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* by Ralf Engelschall.
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* For SJLJ on other systems, one would want to rewrite springboard() and
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* co_create() and hack the jmb_buf stack pointer.
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*/
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#define LIBCO_C
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#include "libco.h"
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#include <stdlib.h>
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#include <signal.h>
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#include <setjmp.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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sigjmp_buf context;
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void (*coentry)(void);
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void *stack;
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} cothread_struct;
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static thread_local cothread_struct co_primary;
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static thread_local cothread_struct *creating, *co_running = 0;
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static void springboard(int ignored) {
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if(sigsetjmp(creating->context, 0)) {
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co_running->coentry();
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}
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}
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cothread_t co_active() {
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if(!co_running) co_running = &co_primary;
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return (cothread_t)co_running;
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}
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cothread_t co_create(unsigned int size, void (*coentry)(void)) {
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if(!co_running) co_running = &co_primary;
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cothread_struct *thread = (cothread_struct*)malloc(sizeof(cothread_struct));
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if(thread) {
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struct sigaction handler;
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struct sigaction old_handler;
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stack_t stack;
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stack_t old_stack;
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thread->coentry = thread->stack = 0;
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stack.ss_flags = 0;
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stack.ss_size = size;
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thread->stack = stack.ss_sp = malloc(size);
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if(stack.ss_sp && !sigaltstack(&stack, &old_stack)) {
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handler.sa_handler = springboard;
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handler.sa_flags = SA_ONSTACK;
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sigemptyset(&handler.sa_mask);
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creating = thread;
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if(!sigaction(SIGUSR1, &handler, &old_handler)) {
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if(!raise(SIGUSR1)) {
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thread->coentry = coentry;
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}
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sigaltstack(&old_stack, 0);
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sigaction(SIGUSR1, &old_handler, 0);
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}
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}
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if(thread->coentry != coentry) {
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co_delete(thread);
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thread = 0;
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}
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}
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return (cothread_t)thread;
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}
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void co_delete(cothread_t cothread) {
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if(cothread) {
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if(((cothread_struct*)cothread)->stack) {
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free(((cothread_struct*)cothread)->stack);
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}
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free(cothread);
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}
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}
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void co_switch(cothread_t cothread) {
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if(!sigsetjmp(co_running->context, 0)) {
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co_running = (cothread_struct*)cothread;
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siglongjmp(co_running->context, 1);
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}
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}
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#ifdef __cplusplus
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}
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#endif
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