1 #include "pthread_impl.h"
6 pthread_exit(PTHREAD_CANCELED);
9 long __syscall_cp_asm(volatile void *, syscall_arg_t,
10 syscall_arg_t, syscall_arg_t, syscall_arg_t,
11 syscall_arg_t, syscall_arg_t, syscall_arg_t);
13 long __syscall_cp_c(syscall_arg_t nr,
14 syscall_arg_t u, syscall_arg_t v, syscall_arg_t w,
15 syscall_arg_t x, syscall_arg_t y, syscall_arg_t z)
20 if (!libc.has_thread_pointer || (self = __pthread_self())->canceldisable)
21 return __syscall(nr, u, v, w, x, y, z);
23 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
24 if (r==-EINTR && nr!=SYS_close && self->cancel && !self->canceldisable)
29 static void _sigaddset(sigset_t *set, int sig)
32 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
35 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
37 pthread_t self = __pthread_self();
39 const char *ip = ((char **)&uc->uc_mcontext)[CANCEL_REG_IP];
40 extern const char __cp_begin[1], __cp_end[1];
43 if (!self->cancel || self->canceldisable) return;
45 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
47 if (self->cancelasync || ip >= __cp_begin && ip < __cp_end) {
48 self->canceldisable = 1;
49 pthread_sigmask(SIG_SETMASK, &uc->uc_sigmask, 0);
53 __syscall(SYS_tkill, self->tid, SIGCANCEL);
58 if (!libc.has_thread_pointer) return;
59 pthread_t self = __pthread_self();
60 if (self->cancel && !self->canceldisable)
64 static void init_cancellation()
66 struct sigaction sa = {
67 .sa_flags = SA_SIGINFO | SA_RESTART,
68 .sa_sigaction = cancel_handler
70 sigfillset(&sa.sa_mask);
71 __libc_sigaction(SIGCANCEL, &sa, 0);
74 int pthread_cancel(pthread_t t)
81 a_store(&t->cancel, 1);
82 return pthread_kill(t, SIGCANCEL);