Added basic threading support, changed license back to Apache-2.0 and many fixes. (0.15.0)

src/array_utils.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "value.h"

src/bytecode.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "bytecode.h"

src/bytecode.h

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #ifndef FUN_BYTECODE_H
@@ -35,7 +35,7 @@ typedef enum {
     OP_EQ,       // a == b -> push 1/0
     OP_NEQ,      // a != b -> push 1/0
 
-    OP_POP,            // discard top of stack
+    OP_POP,            // dApache-2.0ard top of stack
     OP_JUMP,           // unconditional jump
     OP_JUMP_IF_FALSE,  // jump if top of stack is false (0)
 
@@ -115,6 +115,11 @@ typedef enum {
     // OS
     OP_ENV,           // pops name string; pushes value string (or "")
 
+    // Threads
+    OP_THREAD_SPAWN,  // operand: 0=no args, 1=has args; pops [args?], fn; pushes thread id (int>0)
+    OP_THREAD_JOIN,   // pops thread id; waits; pushes result value (or Nil)
+    OP_SLEEP_MS,      // pops milliseconds; sleeps; pushes Nil (for statement POP safety)
+
     // Bitwise (32-bit) and shifts/rotates
     OP_BAND,          // pops b, a; pushes (uint32_t)(a & b)
     OP_BOR,           // pops b, a; pushes (uint32_t)(a | b)

src/fun.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/fun_test.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "bytecode.h"
@@ -118,7 +118,7 @@ int main(void) {
     bytecode_add_instruction(bc, OP_PRINT, 0);      // top=1
 
     bytecode_add_instruction(bc, OP_LOAD_CONST, c1);
-    bytecode_add_instruction(bc, OP_POP, 0);        // discard 1 (stack now empty)
+    bytecode_add_instruction(bc, OP_POP, 0);        // dApache-2.0ard 1 (stack now empty)
 
     // ---------- HALT ----------
     bytecode_add_instruction(bc, OP_HALT, 0);

src/iter.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "value.h"

src/map.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "value.h"

src/parser.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**
@@ -798,7 +798,7 @@ static int emit_primary(Bytecode *bc, const char *src, size_t len, size_t *pos)
 
                 /* Append via insert: res.insert(index=len(res), value) */
                 bytecode_add_instruction(bc, OP_INSERT, 0);
-                /* discard returned new length */
+                /* dApache-2.0ard returned new length */
                 bytecode_add_instruction(bc, OP_POP, 0);
 
                 /* i++ */
@@ -877,7 +877,7 @@ static int emit_primary(Bytecode *bc, const char *src, size_t len, size_t *pos)
 
                 /* Append via insert: res.insert(index=len(res), value) */
                 bytecode_add_instruction(bc, OP_INSERT, 0);
-                /* discard returned new length */
+                /* dApache-2.0ard returned new length */
                 bytecode_add_instruction(bc, OP_POP, 0);
 
                 int c1 = bytecode_add_constant(bc, make_int(1));
@@ -1029,6 +1029,39 @@ static int emit_primary(Bytecode *bc, const char *src, size_t len, size_t *pos)
                 return 1;
             }
 
+            /* threading */
+            if (strcmp(name, "thread_spawn") == 0) {
+                (*pos)++; /* '(' */
+                /* thread_spawn(fn [, args]) */
+                if (!emit_expression(bc, src, len, pos)) { parser_fail(*pos, "thread_spawn expects function as first arg"); free(name); return 0; }
+                int hasArgs = 0;
+                skip_spaces(src, len, pos);
+                if (*pos < len && src[*pos] == ',') {
+                    (*pos)++;
+                    skip_spaces(src, len, pos);
+                    if (!emit_expression(bc, src, len, pos)) { parser_fail(*pos, "thread_spawn second arg must be array or value"); free(name); return 0; }
+                    hasArgs = 1;
+                }
+                if (!consume_char(src, len, pos, ')')) { parser_fail(*pos, "Expected ')' after thread_spawn args"); free(name); return 0; }
+                bytecode_add_instruction(bc, OP_THREAD_SPAWN, hasArgs ? 1 : 0);
+                free(name);
+                return 1;
+            }
+            if (strcmp(name, "thread_join") == 0) {
+                (*pos)++; /* '(' */
+                if (!emit_expression(bc, src, len, pos) || !consume_char(src, len, pos, ')')) { parser_fail(*pos, "thread_join expects 1 arg (thread id)"); free(name); return 0; }
+                bytecode_add_instruction(bc, OP_THREAD_JOIN, 0);
+                free(name);
+                return 1;
+            }
+            if (strcmp(name, "sleep") == 0) {
+                (*pos)++; /* '(' */
+                if (!emit_expression(bc, src, len, pos) || !consume_char(src, len, pos, ')')) { parser_fail(*pos, "sleep expects 1 arg (milliseconds)"); free(name); return 0; }
+                bytecode_add_instruction(bc, OP_SLEEP_MS, 0);
+                free(name);
+                return 1;
+            }
+
             /* bitwise ops (32-bit) */
             if (strcmp(name, "band") == 0) {
                 (*pos)++; /* '(' */
@@ -2317,7 +2350,7 @@ static void parse_simple_statement(Bytecode *bc, const char *src, size_t len, si
             /* rewind to statement start and emit as expression */
             local_pos = *pos;
             if (emit_expression(bc, src, len, &local_pos)) {
-                bytecode_add_instruction(bc, OP_POP, 0); /* discard return value */
+                bytecode_add_instruction(bc, OP_POP, 0); /* dApache-2.0ard return value */
             }
             *pos = local_pos;
             skip_to_eol(src, len, pos);

src/parser.h

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**
@@ -13,7 +13,7 @@
  *  - Optional shebang on the first line.
  *  - Optional single function wrapper: fun <ident>() { ... }
  *  - print("...") statements inside function or at top-level.
- * Produces bytecode that executes all discovered print statements and halts.
+ * Produces bytecode that executes all dApache-2.0overed print statements and halts.
  *
  * Returns: newly allocated Bytecode*, or NULL on error.
  */

src/parser_utils.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include <stdio.h>

src/str_utils.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "value.h"

src/string.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "value.h"

src/test_opcodes.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "vm.h"

src/value.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #include "value.h"

src/value.h

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /* Bring in split-out built-ins without changing the build system yet */
@@ -18,6 +18,9 @@
 #include <string.h>
 #include <stdarg.h>
 
+/* Threading internals (registry and platform glue) */
+#include "vm/os/thread_common.c"
+
 /* Track the currently running VM to annotate error messages */
 static VM *g_active_vm = NULL;
 
@@ -268,7 +271,7 @@ void vm_run(VM *vm, Bytecode *entry) {
             #include "vm/bitwise/shr.c"
             #include "vm/bitwise/rol.c"
             #include "vm/bitwise/ror.c"
-            
+
             #include "vm/core/call.c"
             #include "vm/core/dup.c"
             #include "vm/core/halt.c"
@@ -283,11 +286,10 @@ void vm_run(VM *vm, Bytecode *entry) {
             #include "vm/core/store_global.c"
             #include "vm/core/store_local.c"
             #include "vm/core/swap.c"
-            
+
             #include "vm/io/read_file.c"
             #include "vm/io/write_file.c"
-            #include "vm/os/env.c"
-            
+
             #include "vm/logic/and.c"
             #include "vm/logic/eq.c"
             #include "vm/logic/gt.c"
@@ -302,7 +304,7 @@ void vm_run(VM *vm, Bytecode *entry) {
             #include "vm/maps/keys.c"
             #include "vm/maps/make_map.c"
             #include "vm/maps/values.c"
-            
+
             #include "vm/math/abs.c"
             #include "vm/math/clamp.c"
             #include "vm/math/max.c"
@@ -312,6 +314,11 @@ void vm_run(VM *vm, Bytecode *entry) {
             #include "vm/math/random_int.c"
             #include "vm/math/random_seed.c"
 
+            #include "vm/os/env.c"
+            #include "vm/os/sleep_ms.c"
+            #include "vm/os/thread_join.c"
+            #include "vm/os/thread_spawn.c"
+
             #include "vm/strings/find.c"
             #include "vm/strings/split.c"
             #include "vm/strings/substr.c"

src/vm.h

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 #ifndef FUN_VM_H
@@ -34,6 +34,7 @@ static const char *opcode_names[] = {
     "MIN","MAX","CLAMP","ABS","POW","RANDOM_SEED","RANDOM_INT",
     "MAKE_MAP","KEYS","VALUES","HAS_KEY",
     "READ_FILE","WRITE_FILE","ENV",
+    "THREAD_SPAWN","THREAD_JOIN","SLEEP_MS",
     "BAND","BOR","BXOR","BNOT","SHL","SHR","ROTL","ROTR"
 };
 

src/vm/arithmetic/add.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arithmetic/div.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arithmetic/mul.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arithmetic/sub.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/apop.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/clear.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/contains.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/enumerate.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/index_get.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/index_of.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/index_set.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/insert.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/join.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/make_array.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/push.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/remove.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/set.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/slice.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/arrays/zip.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/bitwise/band.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/bitwise/bnot.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/bitwise/bor.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/bitwise/bxor.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/bitwise/rol.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/bitwise/ror.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/bitwise/shl.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/bitwise/shr.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  *
  * Added: 2025-09-29
  */

src/vm/cast.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/call.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/dup.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/halt.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/jump.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/jump_if_false.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/load_const.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/load_global.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/load_local.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/nop.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/pop.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/return.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/store_global.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/store_local.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/core/swap.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/io/read_file.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/io/write_file.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/len.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/line.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 case OP_LINE: {

src/vm/logic/and.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/eq.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/gt.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/gte.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/lt.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/lte.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/neq.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/not.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/logic/or.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/maps/has_key.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/maps/keys.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/maps/make_map.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/maps/values.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/abs.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/clamp.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/max.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/min.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/mod.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/pow.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/random_int.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/math/random_seed.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/os/env.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 // Get environment variables of the operation system.

src/vm/os/sleep_ms.c

@@ -0,0 +1,27 @@
+/**
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-09-30
+ */
+
+case OP_SLEEP_MS: {
+    Value ms = pop_value(vm);
+    if (ms.type != VAL_INT) {
+        fprintf(stderr, "Runtime type error: sleep(ms) expects Number (milliseconds)\n");
+        free_value(ms);
+        /* push Nil so caller-side POP is safe */
+        push_value(vm, make_nil());
+        break;
+    }
+    long t = (long)ms.i;
+    if (t > 0) fun_sleep_ms(t);
+    free_value(ms);
+    /* push Nil so statement POP does not underflow */
+    push_value(vm, make_nil());
+    break;
+}

src/vm/os/thread_common.c

@@ -0,0 +1,261 @@
+/**
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-09-30
+ */
+
+/* Cross-platform minimal threading support embedded into vm.c TU */
+
+#include <stdint.h>
+#include <time.h>
+
+#ifdef _WIN32
+  #include <windows.h>
+  typedef HANDLE fun_thread_handle_t;
+  typedef DWORD fun_thread_ret_t;
+  #define FUN_THREAD_CALL WINAPI
+  #define fun_sleep_ms(ms) Sleep((DWORD)(ms))
+#else
+  #include <pthread.h>
+  #include <unistd.h>
+  typedef pthread_t fun_thread_handle_t;
+  typedef void* fun_thread_ret_t;
+  #define FUN_THREAD_CALL
+  static inline void fun_sleep_ms(long ms) {
+      if (ms <= 0) return;
+      struct timespec ts;
+      ts.tv_sec = ms / 1000;
+      ts.tv_nsec = (ms % 1000) * 1000000L;
+      nanosleep(&ts, NULL);
+  }
+#endif
+
+#ifndef FUN_MAX_THREADS
+#define FUN_MAX_THREADS 64
+#endif
+
+typedef struct {
+    fun_thread_handle_t handle;
+    int used;
+    int done;
+    Value result; /* owned */
+#ifdef _WIN32
+    DWORD threadId;
+#endif
+} FunThreadEntry;
+
+static FunThreadEntry g_threads[FUN_MAX_THREADS];
+
+#ifdef _WIN32
+static CRITICAL_SECTION g_thr_lock;
+static int g_thr_lock_inited = 0;
+static void fun_thr_lock_init(void) {
+    if (!g_thr_lock_inited) {
+        InitializeCriticalSection(&g_thr_lock);
+        g_thr_lock_inited = 1;
+    }
+}
+static void fun_lock(void)   { if (!g_thr_lock_inited) fun_thr_lock_init(); EnterCriticalSection(&g_thr_lock); }
+static void fun_unlock(void) { LeaveCriticalSection(&g_thr_lock); }
+#else
+static pthread_mutex_t g_thr_lock = PTHREAD_MUTEX_INITIALIZER;
+static void fun_lock(void)   { pthread_mutex_lock(&g_thr_lock); }
+static void fun_unlock(void) { pthread_mutex_unlock(&g_thr_lock); }
+#endif
+
+typedef struct {
+    Bytecode *fn;   /* function to call */
+    int argc;
+    Value *args;    /* array of argc Values (owned by task, will be freed) */
+    int slot;       /* registry slot */
+} FunTask;
+
+#ifdef _WIN32
+static fun_thread_ret_t FUN_THREAD_CALL fun_thread_main(LPVOID param)
+#else
+static fun_thread_ret_t fun_thread_main(void *param)
+#endif
+{
+    FunTask *task = (FunTask*)param;
+    VM tvm;
+    vm_init(&tvm);
+
+    /* Build wrapper: LOAD_CONST <fn>; LOAD_CONST <arg0> ...; CALL argc; HALT */
+    Bytecode *wrap = bytecode_new();
+    int cFn = bytecode_add_constant(wrap, copy_value(&(Value){ .type = VAL_FUNCTION, .fn = task->fn }));
+    bytecode_add_instruction(wrap, OP_LOAD_CONST, cFn);
+    for (int i = 0; i < task->argc; ++i) {
+        int cArg = bytecode_add_constant(wrap, deep_copy_value(&task->args[i]));
+        bytecode_add_instruction(wrap, OP_LOAD_CONST, cArg);
+    }
+    bytecode_add_instruction(wrap, OP_CALL, task->argc);
+    bytecode_add_instruction(wrap, OP_HALT, 0);
+
+    vm_run(&tvm, wrap);
+
+    /* Take the top of stack as result if present, else Nil */
+    Value res = make_nil();
+    if (tvm.sp >= 0) {
+        res = deep_copy_value(&tvm.stack[tvm.sp]);
+    }
+
+    /* cleanup */
+    for (int i = 0; i < task->argc; ++i) {
+        free_value(task->args[i]);
+    }
+    free(task->args);
+    bytecode_free(wrap);
+
+    /* store result */
+    fun_lock();
+    g_threads[task->slot].result = res;
+    g_threads[task->slot].done = 1;
+    fun_unlock();
+
+    free(task);
+
+#ifdef _WIN32
+    return 0;
+#else
+    return NULL;
+#endif
+}
+
+static int fun_alloc_thread_slot(void) {
+    fun_lock();
+    int idx = -1;
+    for (int i = 0; i < FUN_MAX_THREADS; ++i) {
+        if (!g_threads[i].used) { g_threads[i].used = 1; g_threads[i].done = 0; g_threads[i].result = make_nil(); idx = i; break; }
+    }
+    fun_unlock();
+    return idx;
+}
+
+static int fun_thread_spawn(Value fnVal, Value argsMaybe, int hasArgs) {
+    if (fnVal.type != VAL_FUNCTION || !fnVal.fn) {
+        fprintf(stderr, "Runtime error: thread_spawn expects Function as first argument\n");
+        return 0;
+    }
+
+    /* Collect args */
+    int argc = 0;
+    Value *args = NULL;
+
+    if (hasArgs) {
+        if (argsMaybe.type == VAL_ARRAY && argsMaybe.arr) {
+            int n = array_length(&argsMaybe);
+            if (n > 0) {
+                args = (Value*)calloc((size_t)n, sizeof(Value));
+                if (!args) n = 0;
+                for (int i = 0; i < n; ++i) {
+                    Value vi;
+                    if (array_get_copy(&argsMaybe, i, &vi)) {
+                        args[i] = deep_copy_value(&vi);
+                        free_value(vi);
+                    } else {
+                        args[i] = make_nil();
+                    }
+                }
+                argc = n;
+            }
+        } else if (argsMaybe.type != VAL_NIL) {
+            args = (Value*)calloc(1, sizeof(Value));
+            if (args) {
+                args[0] = deep_copy_value(&argsMaybe);
+                argc = 1;
+            }
+        }
+    }
+
+    int slot = fun_alloc_thread_slot();
+    if (slot < 0) {
+        fprintf(stderr, "Runtime error: too many threads\n");
+        /* free args */
+        for (int i = 0; i < argc; ++i) free_value(args[i]);
+        free(args);
+        return 0;
+    }
+
+    FunTask *task = (FunTask*)calloc(1, sizeof(FunTask));
+    if (!task) {
+        for (int i = 0; i < argc; ++i) free_value(args[i]);
+        free(args);
+        fun_lock(); g_threads[slot].used = 0; fun_unlock();
+        return 0;
+    }
+    task->fn = fnVal.fn;
+    task->argc = argc;
+    task->args = args;
+    task->slot = slot;
+
+#ifdef _WIN32
+    HANDLE h = CreateThread(NULL, 0, fun_thread_main, (LPVOID)task, 0, &g_threads[slot].threadId);
+    if (!h) {
+        fprintf(stderr, "Runtime error: CreateThread failed\n");
+        for (int i = 0; i < argc; ++i) free_value(args[i]);
+        free(args);
+        free(task);
+        fun_lock(); g_threads[slot].used = 0; fun_unlock();
+        return 0;
+    }
+    fun_lock(); g_threads[slot].handle = h; fun_unlock();
+#else
+    pthread_t tid;
+    int rc = pthread_create(&tid, NULL, fun_thread_main, (void*)task);
+    if (rc != 0) {
+        fprintf(stderr, "Runtime error: pthread_create failed\n");
+        for (int i = 0; i < argc; ++i) free_value(args[i]);
+        free(args);
+        free(task);
+        fun_lock(); g_threads[slot].used = 0; fun_unlock();
+        return 0;
+    }
+    fun_lock(); g_threads[slot].handle = tid; fun_unlock();
+#endif
+
+    return slot + 1; /* external thread id: 1..N */
+}
+
+static Value fun_thread_join(int tid) {
+    if (tid <= 0 || tid > FUN_MAX_THREADS) {
+        fprintf(stderr, "Runtime error: thread_join invalid id %d\n", tid);
+        return make_nil();
+    }
+    int idx = tid - 1;
+
+#ifdef _WIN32
+    fun_lock();
+    HANDLE h = g_threads[idx].handle;
+    int used = g_threads[idx].used;
+    fun_unlock();
+    if (!used || !h) return make_nil();
+    WaitForSingleObject(h, INFINITE);
+    CloseHandle(h);
+#else
+    fun_lock();
+    pthread_t h = g_threads[idx].handle;
+    int used = g_threads[idx].used;
+    fun_unlock();
+    if (!used) return make_nil();
+    pthread_join(h, NULL);
+#endif
+
+    /* fetch result and free slot */
+    fun_lock();
+    Value res = deep_copy_value(&g_threads[idx].result);
+    free_value(g_threads[idx].result);
+    g_threads[idx].result = make_nil();
+    g_threads[idx].used = 0;
+    g_threads[idx].done = 0;
+#ifdef _WIN32
+    g_threads[idx].threadId = 0;
+#endif
+    fun_unlock();
+
+    return res;
+}

src/vm/os/thread_join.c

@@ -0,0 +1,24 @@
+/**
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-09-30
+ */
+
+case OP_THREAD_JOIN: {
+    Value vtid = pop_value(vm);
+    if (vtid.type != VAL_INT) {
+        fprintf(stderr, "Runtime type error: thread_join expects thread id (int)\n");
+        push_value(vm, make_nil());
+        free_value(vtid);
+        break;
+    }
+    Value res = fun_thread_join((int)vtid.i);
+    free_value(vtid);
+    push_value(vm, res); /* takes ownership */
+    break;
+}

src/vm/os/thread_spawn.c

@@ -0,0 +1,24 @@
+/**
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-09-30
+ */
+
+case OP_THREAD_SPAWN: {
+    /* operand: 0 -> no args; 1 -> has args array or single arg */
+    Value argsMaybe = make_nil();
+    if (inst.operand == 1) {
+        argsMaybe = pop_value(vm); /* maybe array or scalar */
+    }
+    Value fnv = pop_value(vm);
+    int tid = fun_thread_spawn(fnv, argsMaybe, inst.operand == 1);
+    free_value(fnv);
+    if (inst.operand == 1) free_value(argsMaybe);
+    push_value(vm, make_int(tid));
+    break;
+}

src/vm/print.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/sclamp.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 case OP_SCLAMP: {

src/vm/strings/find.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/strings/split.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/strings/substr.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/to_number.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/to_string.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 /**

src/vm/typeof.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 case OP_TYPEOF: {
@@ -23,4 +23,4 @@ case OP_TYPEOF: {
     push_value(vm, make_string(tname));
     free_value(v);
     break;
-}
+}

src/vm/uclamp.c

@@ -3,8 +3,8 @@
  * https://hanez.org/project/fun/
  *
  * Copyright 2025 Johannes Findeisen <you@hanez.org>
- * Licensed under the terms of the ISC license.
- * https://opensource.org/license/isc-license-txt
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
  */
 
 case OP_UCLAMP: {