From 56dc6ecb70e6fc76d32d6a7194acb273b76bfe0e Mon Sep 17 00:00:00 2001
From: David Guillen Fandos
Date: Mon, 8 Mar 2021 18:44:03 +0100
Subject: Remove libco

This removes libco and all the usages of it (+pthreads).
Rewired all dynarecs and interpreter to return after every frame so that
libretro can process events. This required to make dynarec re-entrant.

Dynarecs were updated to check for new frame on every update (IRQ, cycle
exhaustion, I/O write, etc). The performance impact of doing so should
be minimal (and definitely outweight the libco gains). While at it,
fixed small issues to get a bit more perf: arm dynarec was not idling
correctly, mips was using stack when not needed, etc.

Tested on PSP (mips), OGA (armv7), Linux (x86 and interpreter). Not
tested on Android though.
---
 libco/sjlj.c | 115 -----------------------------------------------------------
 1 file changed, 115 deletions(-)
 delete mode 100644 libco/sjlj.c

(limited to 'libco/sjlj.c')

diff --git a/libco/sjlj.c b/libco/sjlj.c
deleted file mode 100644
index f074714..0000000
--- a/libco/sjlj.c
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
-  libco.sjlj (2008-01-28)
-  author: Nach
-  license: public domain
-*/
-
-/*
- * Note this was designed for UNIX systems. Based on ideas expressed in a paper
- * by Ralf Engelschall.
- * For SJLJ on other systems, one would want to rewrite springboard() and
- * co_create() and hack the jmb_buf stack pointer.
- */
-
-#define LIBCO_C
-#include <libco.h>
-#include <stdlib.h>
-#include <signal.h>
-#include <setjmp.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef struct
-{
-   sigjmp_buf context;
-   void (*coentry)(void);
-   void *stack;
-} cothread_struct;
-
-static thread_local cothread_struct co_primary;
-static thread_local cothread_struct *creating, *co_running = 0;
-
-static void springboard(int ignored)
-{
-   if(sigsetjmp(creating->context, 0))
-      co_running->coentry();
-}
-
-cothread_t co_active(void)
-{
-  if (!co_running)
-     co_running = &co_primary;
-  return (cothread_t)co_running;
-}
-
-cothread_t co_create(unsigned int size, void (*coentry)(void))
-{
-   if(!co_running)
-      co_running = &co_primary;
-
-   cothread_struct *thread = (cothread_struct*)malloc(sizeof(cothread_struct));
-
-   if(thread)
-   {
-      struct sigaction handler;
-      struct sigaction old_handler;
-
-      stack_t stack;
-      stack_t old_stack;
-
-      thread->coentry = thread->stack = 0;
-
-      stack.ss_flags = 0;
-      stack.ss_size = size;
-      thread->stack = stack.ss_sp = malloc(size);
-
-      if(stack.ss_sp && !sigaltstack(&stack, &old_stack))
-      {
-         handler.sa_handler = springboard;
-         handler.sa_flags = SA_ONSTACK;
-         sigemptyset(&handler.sa_mask);
-         creating = thread;
-
-         if(!sigaction(SIGUSR1, &handler, &old_handler))
-         {
-            if(!raise(SIGUSR1))
-               thread->coentry = coentry;
-            sigaltstack(&old_stack, 0);
-            sigaction(SIGUSR1, &old_handler, 0);
-         }
-      }
-
-      if(thread->coentry != coentry)
-      {
-         co_delete(thread);
-         thread = 0;
-      }
-   }
-
-   return (cothread_t)thread;
-}
-
-void co_delete(cothread_t cothread)
-{
-   if(cothread)
-   {
-      if(((cothread_struct*)cothread)->stack)
-         free(((cothread_struct*)cothread)->stack);
-      free(cothread);
-   }
-}
-
-void co_switch(cothread_t cothread)
-{
-   if(!sigsetjmp(co_running->context, 0))
-   {
-      co_running = (cothread_struct*)cothread;
-      siglongjmp(co_running->context, 1);
-   }
-}
-
-#ifdef __cplusplus
-}
-#endif
-- 
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