github.com/afumu/libc@v0.0.6/musl/src/thread/call_once.c (about)

     1  #include <threads.h>
     2  #include <pthread.h>
     3  
     4  void call_once(once_flag *flag, void (*func)(void))
     5  {
     6  	__pthread_once(flag, func);
     7  }