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.
---
 main.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'main.c')

diff --git a/main.c b/main.c
index 0f9bb88..a2f6d8e 100644
--- a/main.c
+++ b/main.c
@@ -132,6 +132,7 @@ u32 update_gba(void)
     cpu_ticks += execute_cycles;
 
     reg[CHANGED_PC_STATUS] = 0;
+    reg[COMPLETED_FRAME] = 0;
 
     if(gbc_sound_update)
     {
@@ -227,14 +228,14 @@ u32 update_gba(void)
           oam_update_count = 0;
           flush_ram_count = 0;
 
-          switch_to_main_thread();
-
           update_gbc_sound(cpu_ticks);
           gbc_sound_update = 0;
 
           process_cheats();
 
           vcount = 0;
+          // We completed a frame, tell the dynarec to exit to the main thread
+          reg[COMPLETED_FRAME] = 1;
         }
 
         if(vcount == (dispstat >> 8))
@@ -267,7 +268,7 @@ u32 update_gba(void)
        if(timer[i].count < execute_cycles)
           execute_cycles = timer[i].count;
     }
-  } while(reg[CPU_HALT_STATE] != CPU_ACTIVE);
+  } while(reg[CPU_HALT_STATE] != CPU_ACTIVE && !reg[COMPLETED_FRAME]);
 
   return execute_cycles;
 }
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