1 #include "pthread_impl.h"
5 pthread_t self = __pthread_self();
6 self->canceldisable = 1;
8 pthread_exit(PTHREAD_CANCELED);
11 long __syscall_cp_asm(volatile void *, long, long, long, long, long, long, long);
13 long (__syscall_cp)(long nr, long u, long v, long w, long x, long y, long z)
18 if (!libc.main_thread || (self = __pthread_self())->canceldisable)
19 return __syscall(nr, u, v, w, x, y, z);
21 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
22 if (r==-EINTR && nr!=SYS_close && self->cancel && !self->canceldisable)
27 static void _sigaddset(sigset_t *set, int sig)
30 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
33 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
35 pthread_t self = __pthread_self();
37 const char *ip = ((char **)&uc->uc_mcontext)[CANCEL_REG_IP];
38 extern const char __cp_begin[1], __cp_end[1];
40 if (!self->cancel || self->canceldisable) return;
42 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
44 if (self->cancelasync || ip >= __cp_begin && ip < __cp_end) {
45 self->canceldisable = 1;
46 pthread_sigmask(SIG_SETMASK, &uc->uc_sigmask, 0);
50 __syscall(SYS_tgkill, self->pid, self->tid, SIGCANCEL);
55 pthread_t self = pthread_self();
56 if (self->cancel && !self->canceldisable)
60 static void init_cancellation()
62 struct sigaction sa = {
63 .sa_flags = SA_SIGINFO | SA_RESTART,
64 .sa_sigaction = cancel_handler
66 sigfillset(&sa.sa_mask);
67 __libc_sigaction(SIGCANCEL, &sa, 0);
70 int pthread_cancel(pthread_t t)
77 a_store(&t->cancel, 1);
78 return pthread_kill(t, SIGCANCEL);