Fix and debug

Python/jit.c

@@ -58,9 +58,10 @@ jit_alloc(size_t size)
     int failed = memory == NULL;
 #elif defined(__APPLE__)
     int flags = MAP_ANONYMOUS | MAP_PRIVATE;
-    int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
+    int prot = PROT_READ | PROT_WRITE;
     if (pthread_jit_write_protect_supported_np()) {
         flags |= MAP_JIT;
+        prot |= PROT_EXEC;
     }
     unsigned char *memory = mmap(NULL, size, prot, flags, -1, 0);
     int failed = memory == MAP_FAILED;
@@ -114,11 +115,15 @@ mark_executable(unsigned char *memory, size_t size)
     int old;
     int failed = !VirtualProtect(memory, size, PAGE_EXECUTE_READ, &old);
 #elif defined(__APPLE__)
+    int failed = 0;
     __builtin___clear_cache((char *)memory, (char *)memory + size);
     if (pthread_jit_write_protect_supported_np()) {
+        printf("pthread supported\n");
         pthread_jit_write_protect_np(1);
+    } else {
+        printf("pthread NOT supported\n");
+        failed = mprotect(memory, size, PROT_EXEC | PROT_READ);
     }
-    int failed = 0;
 #else
     __builtin___clear_cache((char *)memory, (char *)memory + size);
     int failed = mprotect(memory, size, PROT_EXEC | PROT_READ);