1#include "pthread_impl.h" 2#include "atomic.h" 3#include "syscall.h" 4/* cheat and reuse CRTJMP macro from dynlink code */ 5#include "dynlink.h" 6 7static volatile int lock; 8static void *unmap_base; 9static size_t unmap_size; 10static char shared_stack[256]; 11 12static void do_unmap() 13{ 14 __syscall(SYS_munmap, unmap_base, unmap_size); 15 __syscall(SYS_exit); 16} 17 18void __unmapself(void *base, size_t size) 19{ 20 int tid=__pthread_self()->tid; 21 char *stack = shared_stack + sizeof shared_stack; 22 stack -= (uintptr_t)stack % 16; 23 while (lock || a_cas(&lock, 0, tid)) 24 a_spin(); 25 __syscall(SYS_set_tid_address, &lock); 26 unmap_base = base; 27 unmap_size = size; 28 CRTJMP(do_unmap, stack); 29} 30