add pygame patch

Author: timfel

graalpython/lib-graalpython/patches/pygame/sdist/pygame-2.patch

@@ -0,0 +1,45 @@
+diff --git a/src_c/base.c b/src_c/base.c
+index e73eb001..6f1c479d 100644
+--- a/src_c/base.c
++++ b/src_c/base.c
+@@ -25,6 +25,7 @@
+ #include "pygame.h"
+ 
+ #include <signal.h>
++#include <string.h>
+ #include "doc/pygame_doc.h"
+ #include "pgarrinter.h"
+ #include "pgcompat.h"
+@@ -2022,18 +2023,27 @@ pg_install_parachute(void)
+ {
+ #ifdef HAVE_SIGNAL_H
+     int i;
+-    void (*ohandler)(int);
++    struct sigaction act;
+ 
+     if (parachute_installed) {
+         return;
+     }
+     parachute_installed = 1;
+ 
+-    /* Set a handler for any fatal signal not already handled */
++    /* Set a handler for any fatal signal not already handled.
++       Use sigaction to retrieve the current handler first, so
++       we don't mess with signal handlers in multi-threaded
++       runtimes without a GIL. This is still racy, but better
++       than using the signal function. */
+     for (i = 0; fatal_signals[i]; ++i) {
+-        ohandler = (void (*)(int))signal(fatal_signals[i], pygame_parachute);
+-        if (ohandler != SIG_DFL) {
+-            signal(fatal_signals[i], ohandler);
++        sigaction(fatal_signals[i], NULL, &act);
++        if (act.sa_handler == SIG_DFL) {
++            memset(&act, 0, sizeof(struct sigaction));
++            sigemptyset(&act.sa_mask);
++            sigaddset(&act.sa_mask, fatal_signals[i]);
++            act.sa_handler = pygame_parachute;
++            act.sa_flags = SA_RESTART;
++            sigaction(fatal_signals[i], &act, NULL);
+         }
+     }
+