1 #include "pthread_impl.h"
5 pthread_t self = __pthread_self();
7 self->canceldisable = 1;
9 pthread_exit(PTHREAD_CANCELED);
12 long __syscall_cp_asm(volatile void *, long, long, long, long, long, long, long);
14 long (__syscall_cp)(long nr, long u, long v, long w, long x, long y, long z)
19 if (!libc.main_thread || (self = __pthread_self())->canceldisable)
20 return __syscall(nr, u, v, w, x, y, z);
22 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
23 if (r==-EINTR && nr!=SYS_close && self->cancel && !self->canceldisable)
28 static void _sigaddset(sigset_t *set, int sig)
31 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
34 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
36 pthread_t self = __pthread_self();
38 const char *ip = ((char **)&uc->uc_mcontext)[CANCEL_REG_IP];
39 extern const char __cp_begin[1], __cp_end[1];
41 if (!self->cancel || self->canceldisable) return;
43 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
45 if (self->cancelasync || ip >= __cp_begin && ip < __cp_end) {
46 self->canceldisable = 1;
47 pthread_sigmask(SIG_SETMASK, &uc->uc_sigmask, 0);
52 __syscall(SYS_tgkill, self->pid, self->tid, SIGCANCEL);
57 pthread_t self = pthread_self();
58 if (self->cancel && !self->canceldisable)
62 static void init_cancellation()
64 struct sigaction sa = {
65 .sa_flags = SA_SIGINFO | SA_RESTART,
66 .sa_sigaction = cancel_handler
68 sigfillset(&sa.sa_mask);
69 __libc_sigaction(SIGCANCEL, &sa, 0);
72 int pthread_cancel(pthread_t t)
79 a_store(&t->cancel, 1);
80 return pthread_kill(t, SIGCANCEL);