1 #include "pthread_impl.h"
7 pthread_t self = __pthread_self();
8 if (self->canceldisable == PTHREAD_CANCEL_ENABLE || self->cancelasync)
9 pthread_exit(PTHREAD_CANCELED);
10 self->canceldisable = PTHREAD_CANCEL_DISABLE;
14 /* If __syscall_cp_asm has adjusted the stack pointer, it must provide a
15 * definition of __cp_cancel to undo those adjustments and call __cancel.
16 * Otherwise, __cancel provides a definition for __cp_cancel. */
18 weak_alias(__cancel, __cp_cancel);
20 long __syscall_cp_asm(volatile void *, syscall_arg_t,
21 syscall_arg_t, syscall_arg_t, syscall_arg_t,
22 syscall_arg_t, syscall_arg_t, syscall_arg_t);
24 long __syscall_cp_c(syscall_arg_t nr,
25 syscall_arg_t u, syscall_arg_t v, syscall_arg_t w,
26 syscall_arg_t x, syscall_arg_t y, syscall_arg_t z)
32 if (!libc.has_thread_pointer || (st=(self=__pthread_self())->canceldisable)
33 && (st==PTHREAD_CANCEL_DISABLE || nr==SYS_close))
34 return __syscall(nr, u, v, w, x, y, z);
36 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
37 if (r==-EINTR && nr!=SYS_close && self->cancel &&
38 self->canceldisable != PTHREAD_CANCEL_DISABLE)
43 static void _sigaddset(sigset_t *set, int sig)
46 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
49 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
51 pthread_t self = __pthread_self();
53 const char *ip = ((char **)&uc->uc_mcontext)[CANCEL_REG_IP];
54 extern const char __cp_begin[1], __cp_end[1];
57 if (!self->cancel || self->canceldisable == PTHREAD_CANCEL_DISABLE) return;
59 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
61 if (self->cancelasync || ip >= __cp_begin && ip < __cp_end) {
62 ((char **)&uc->uc_mcontext)[CANCEL_REG_IP] = (char *)__cp_cancel;
66 __syscall(SYS_tkill, self->tid, SIGCANCEL);
71 if (!libc.has_thread_pointer) return;
72 pthread_t self = __pthread_self();
73 if (self->cancel && !self->canceldisable)
77 static void init_cancellation()
79 struct sigaction sa = {
80 .sa_flags = SA_SIGINFO | SA_RESTART,
81 .sa_sigaction = cancel_handler
83 sigfillset(&sa.sa_mask);
84 __libc_sigaction(SIGCANCEL, &sa, 0);
87 int pthread_cancel(pthread_t t)
94 a_store(&t->cancel, 1);
95 return pthread_kill(t, SIGCANCEL);