Changes in doc/papers/concurrency/examples/PingPong.c [a573c22:d7a02ae]

File:

• doc/papers/concurrency/examples/PingPong.c (modified) (3 diffs)

doc/papers/concurrency/examples/PingPong.c

@@ -2 +2 @@
 
 typedef struct PingPong {
-        int restart;                                                                            // style 1
+        const char * name;
         int N, i;
-        const char * name;
         struct PingPong * partner;
-        void * next;                                                                            // style 2
+        void * next;
 } PingPong;
-#define PPCtor( name, N ) { 0, N, 0, name, NULL, NULL }
-
+#define PPCtor( name, N ) { name, N, 0, NULL, NULL }
 void comain( PingPong * pp ) __attribute__(( noinline ));
 void comain( PingPong * pp ) {
+        if ( __builtin_expect(pp->next != 0, 1) ) goto *pp->next;
 #if 0
-        if ( __builtin_expect(pp->next != 0, 1) ) goto *pp->next;
+        pp->next = &&here;
+                asm( "mov  %0,%%rdi" : "=m" (pp) );
+                asm( "mov  %rdi,%rax" );
+#ifndef OPT
+#ifdef PRINT
+                asm( "add  $16, %rsp" );
+#endif // PRINT
+                asm( "popq %rbp" );
+#endif // ! OPT
+
+#ifdef OPT
+#ifdef PRINT
+                asm( "popq %rbx" );
+#endif // PRINT
+#endif // OPT
+                asm( "jmp  comain" );
+  here: ;
+#endif // 0
+
         pp->next = &&cycle;
         for ( ; pp->i < pp->N; pp->i += 1 ) {
@@ -36 +53 @@
           cycle: ;
         } // for
-#endif // 0
-
-#if 1
-        static void * states[] = {&&s0, &&s1};
-        goto *states[pp->restart];
-  s0: pp->restart = 1;
-        for ( ; pp->i < pp->N; pp->i += 1 ) {
-#ifdef PRINT
-                printf( "%s %d\n", pp->name, pp->i );
-#endif // PRINT
-                asm( "mov  %0,%%rdi" : "=m" (pp->partner) );
-                asm( "mov  %rdi,%rax" );
-#ifndef OPT
-#ifdef PRINT
-                asm( "add  $16, %rsp" );
-#endif // PRINT
-                asm( "popq %rbp" );
-#endif // ! OPT
-
-#ifdef OPT
-#ifdef PRINT
-                asm( "popq %rbx" );
-#endif // PRINT
-#endif // OPT
-                asm( "jmp  comain" );
-          s1: ;
-        } // for
-#endif // 0
 }
 
@@ -81 +70 @@
 // Local Variables: //
 // tab-width: 4 //
-// compile-command: "gcc-9 -g -DPRINT PingPong.c" //
+// compile-command: "gcc-8 -g -DPRINT PingPong.c" //
 // End: //