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Task/Closures-Value-capture/C/closures-value-capture-1.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+
+typedef int (*f_int)();
+
+#define TAG 0xdeadbeef
+int _tmpl() {
+	volatile int x = TAG;
+	return x * x;
+}
+
+#define PROT (PROT_EXEC | PROT_WRITE)
+#define FLAGS (MAP_PRIVATE | MAP_ANONYMOUS)
+f_int dupf(int v)
+{
+	size_t len = (void*)dupf - (void*)_tmpl;
+	f_int ret = mmap(NULL, len, PROT, FLAGS, 0, 0);
+	char *p;
+	if(ret == MAP_FAILED) {
+		perror("mmap");
+		exit(-1);
+	}
+	memcpy(ret, _tmpl, len);
+	for (p = (char*)ret; p < (char*)ret + len - sizeof(int); p++)
+		if (*(int *)p == TAG) *(int *)p = v;
+	return ret;
+}
+
+int main()
+{
+	f_int funcs[10];
+	int i;
+	for (i = 0; i < 10; i++) funcs[i] = dupf(i);
+
+	for (i = 0; i < 9; i++)
+		printf("func[%d]: %d\n", i, funcs[i]());
+
+	return 0;
+}

Task/Closures-Value-capture/C/closures-value-capture-2.c

@@ -0,0 +1,9 @@
+func[0]: 0
+func[1]: 1
+func[2]: 4
+func[3]: 9
+func[4]: 16
+func[5]: 25
+func[6]: 36
+func[7]: 49
+func[8]: 64

Task/Closures-Value-capture/C/closures-value-capture-3.c

@@ -0,0 +1,33 @@
+void init(void)
+{
+  t = intern(lit("t"));
+  x = intern(lit("x"));
+}
+
+val square(val env)
+{
+  val xbind = assoc(env, x); /* look up binding of variable x in env */
+  val xval = cdr(xbind);     /* value is the cdr of the binding cell */
+  return num(cnum(xval) * cnum(xval));
+}
+
+int main(void)
+{
+  int i;
+  val funlist = nil, iter;
+
+  init();
+
+  for (i = 0; i < 10; i++) {
+    val closure_env = cons(cons(x, num(i)), nil);
+    funlist = cons(func_f0(closure_env, square), funlist);
+  }
+
+  for (iter = funlist; iter != nil; iter = cdr(iter)) {
+    val fun = car(iter);
+    val square = funcall(fun, nao);
+
+    printf("%d\n", cnum(square));
+  }
+  return 0;
+}