PS2 usability fixes (#15861)

- Make sure logs are written before frontend deinit
- Add memory stats
- Add process_args to frontend to fix some cases when salamander cfg was not filled
- Add a missing include in case someone wants to compile for PS2 with HAVE_THREADS

frontend/drivers/platform_ps2.c

@@ -416,6 +416,46 @@ enum frontend_architecture frontend_ps2_get_arch(void)
    return FRONTEND_ARCH_MIPS;
 }
 
+static uint64_t frontend_ps2_get_total_mem(void) { return 32*1024*1024; }
+
+/* Crude try-and-fail approach, in lack of a better solution. */
+static uint64_t frontend_ps2_get_free_mem(void)
+{
+  uint64_t free_mem;
+  size_t s0 = 32*1024*1024;
+  void* p1;
+  void* p2;
+  void* p3;
+
+  while (s0 && (p1 = malloc(s0)) == NULL)
+    s0 >>= 1;
+
+  free_mem = s0;
+
+  s0 = 32*1024*1024;
+
+  while (s0 && (p2 = malloc(s0)) == NULL)
+    s0 >>= 1;
+
+  free_mem += s0;
+
+  s0 = 32*1024*1024;
+
+  while (s0 && (p3 = malloc(s0)) == NULL)
+    s0 >>= 1;
+
+  free_mem += s0;
+
+  if (p1)
+    free(p1);
+  if (p2)
+    free(p2);
+  if (p3)
+    free(p3);
+
+  return free_mem;
+}
+
 static int frontend_ps2_parse_drive_list(void *data, bool load_content)
 {
 #ifndef IS_SALAMANDER
@@ -474,12 +514,23 @@ static int frontend_ps2_parse_drive_list(void *data, bool load_content)
    return 0;
 }
 
+static void frontend_ps2_process_args(int *argc, char *argv[])
+{
+#ifndef IS_SALAMANDER
+   /* Make sure active core path is set here. */
+   char path[PATH_MAX_LENGTH] = {0};
+   strlcpy(path, argv[0], sizeof(path));
+   if (path_is_valid(path))
+      path_set(RARCH_PATH_CORE, path);
+#endif
+}
+
 frontend_ctx_driver_t frontend_ctx_ps2 = {
    frontend_ps2_get_env,         /* get_env */
    frontend_ps2_init,            /* init */
    frontend_ps2_deinit,          /* deinit */
    frontend_ps2_exitspawn,       /* exitspawn */
-   NULL,                         /* process_args */
+   frontend_ps2_process_args,    /* process_args */
    frontend_ps2_exec,            /* exec */
 #ifdef IS_SALAMANDER
    NULL,                         /* set_fork */
@@ -494,8 +545,8 @@ frontend_ctx_driver_t frontend_ctx_ps2 = {
    frontend_ps2_get_arch,        /* get_architecture */
    NULL,                         /* get_powerstate */
    frontend_ps2_parse_drive_list,/* parse_drive_list */
-   NULL,                         /* get_total_mem */
-   NULL,                         /* get_free_mem */
+   frontend_ps2_get_total_mem,   /* get_total_mem */
+   frontend_ps2_get_free_mem,    /* get_free_mem */
    NULL,                         /* install_signal_handler */
    NULL,                         /* get_sighandler_state */
    NULL,                         /* set_sighandler_state */

libretro-common/rthreads/rthreads.c

@@ -60,6 +60,10 @@
 #include <sys/time.h>
 #endif
 
+#if defined(PS2)
+#include <ps2sdkapi.h>
+#endif
+
 #ifdef __MACH__
 #include <mach/clock.h>
 #include <mach/mach.h>

retroarch.c

@@ -4811,7 +4811,11 @@ void main_exit(void *args)
 #if defined(HAVE_LOGGER) && !defined(ANDROID)
    logger_shutdown();
 #endif
-
+#ifdef PS2
+   /* PS2 frontend driver deinit also detaches filesystem,
+    * so make sure logs are written in advance. */
+   retro_main_log_file_deinit();
+#endif
    frontend_driver_deinit(args);
    frontend_driver_exitspawn(
          path_get_ptr(RARCH_PATH_CORE),