1 #include "pthread_impl.h"
7 pthread_exit(PTHREAD_CANCELED);
10 /* If __syscall_cp_asm has adjusted the stack pointer, it must provide a
11 * definition of __cp_cancel to undo those adjustments and call __cancel.
12 * Otherwise, __cancel provides a definition for __cp_cancel. */
14 weak_alias(__cancel, __cp_cancel);
16 long __syscall_cp_asm(volatile void *, syscall_arg_t,
17 syscall_arg_t, syscall_arg_t, syscall_arg_t,
18 syscall_arg_t, syscall_arg_t, syscall_arg_t);
20 long __syscall_cp_c(syscall_arg_t nr,
21 syscall_arg_t u, syscall_arg_t v, syscall_arg_t w,
22 syscall_arg_t x, syscall_arg_t y, syscall_arg_t z)
27 if (!libc.has_thread_pointer || (self = __pthread_self())->canceldisable)
28 return __syscall(nr, u, v, w, x, y, z);
30 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
31 if (r==-EINTR && nr!=SYS_close && self->cancel && !self->canceldisable)
36 static void _sigaddset(sigset_t *set, int sig)
39 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
42 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
44 pthread_t self = __pthread_self();
46 const char *ip = ((char **)&uc->uc_mcontext)[CANCEL_REG_IP];
47 extern const char __cp_begin[1], __cp_end[1];
50 if (!self->cancel || self->canceldisable) return;
52 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
54 if (self->cancelasync || ip >= __cp_begin && ip < __cp_end) {
55 self->canceldisable = 1;
56 pthread_sigmask(SIG_SETMASK, &uc->uc_sigmask, 0);
60 __syscall(SYS_tkill, self->tid, SIGCANCEL);
65 if (!libc.has_thread_pointer) return;
66 pthread_t self = __pthread_self();
67 if (self->cancel && !self->canceldisable)
71 static void init_cancellation()
73 struct sigaction sa = {
74 .sa_flags = SA_SIGINFO | SA_RESTART,
75 .sa_sigaction = cancel_handler
77 sigfillset(&sa.sa_mask);
78 __libc_sigaction(SIGCANCEL, &sa, 0);
81 int pthread_cancel(pthread_t t)
88 a_store(&t->cancel, 1);
89 return pthread_kill(t, SIGCANCEL);