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