source: asp3_tinet_ecnl_arm/trunk/musl-1.1.18/src/thread/__unmapself.c@ 352

#include "pthread_impl.h"
#include "atomic.h"
#include "syscall.h"
/* cheat and reuse CRTJMP macro from dynlink code */
#include "dynlink.h"

static volatile int lock;
static void *unmap_base;
static size_t unmap_size;
static char shared_stack[256];

static void do_unmap()
{
        __syscall(SYS_munmap, unmap_base, unmap_size);
        __syscall(SYS_exit);
}

void __unmapself(void *base, size_t size)
{
        int tid=__pthread_self()->tid;
        char *stack = shared_stack + sizeof shared_stack;
        stack -= (uintptr_t)stack % 16;
        while (lock || a_cas(&lock, 0, tid))
                a_spin();
        __syscall(SYS_set_tid_address, &lock);
        unmap_base = base;
        unmap_size = size;
        CRTJMP(do_unmap, stack);
}