diff --git a/core.h b/core.h
index 4a48b95..19bbd32 100644
--- a/core.h
+++ b/core.h
@@ -175,6 +175,12 @@ DefineList(string, String);
 }
 #define ListTail(list, start) ListSlice(list, start, (list).length)
 
+#define ListRemove(list, index)\
+    if ((index) >= 0 && (index) < (list)->length) {\
+        memcpy((list)->data + (index), (list)->data + (index) + 1, (parentNode->children.length - (i + 1))*sizeof(*((list)->data)));\
+        parentNode->children.length -= 1;\
+    }
+
 // ### Strings ###
 struct string {
     char *str;
diff --git a/os.h b/os.h
index c9446d8..c830702 100644
--- a/os.h
+++ b/os.h
@@ -17,4 +17,12 @@ bool os_fileAppend(Arena *arena, string filename, const byte *contents, size_t c
 // ### Standard IO ###
 void os_print(StdStream target, const char *fmt, va_list argList);
 
+// ### Multithreading ###
+typedef struct OS_Thread OS_Thread;
+struct OS_Thread {
+    uint64 id;
+};
+
+OS_Thread os_createThread(void *(*entry)(void *ctx), void *ctx);
+
 #endif
diff --git a/os_linux.c b/os_linux.c
index 8b2897b..3b1de42 100644
--- a/os_linux.c
+++ b/os_linux.c
@@ -7,6 +7,7 @@
 #include "sys/stat.h"
 #include "unistd.h" // POSIX Standard
 #include "stdio.h"
+#include "pthread.h"
 
 void *os_alloc(size_t capacity) {
     return mmap(0, capacity, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
@@ -96,4 +97,13 @@ void os_print(StdStream target, const char *fmt, va_list argList) {
     scratchEnd(temp);
 }
 
+OS_Thread os_createThread(void *(*entry)(void *), void *ctx) {
+    pthread_t handle;
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+    pthread_create(&handle, &attr, entry, ctx);
+    pthread_attr_destroy(&attr);
+    return (OS_Thread){ .id=handle };
+}
+
 #endif