2 #include "pthread_impl.h"
8 pthread_t self = __pthread_self();
9 if (self->canceldisable == PTHREAD_CANCEL_ENABLE || self->cancelasync)
10 pthread_exit(PTHREAD_CANCELED);
11 self->canceldisable = PTHREAD_CANCEL_DISABLE;
15 /* If __syscall_cp_asm has adjusted the stack pointer, it must provide a
16 * definition of __cp_cancel to undo those adjustments and call __cancel.
17 * Otherwise, __cancel provides a definition for __cp_cancel. */
19 weak_alias(__cancel, __cp_cancel);
21 long __syscall_cp_asm(volatile void *, syscall_arg_t,
22 syscall_arg_t, syscall_arg_t, syscall_arg_t,
23 syscall_arg_t, syscall_arg_t, syscall_arg_t);
25 long __syscall_cp_c(syscall_arg_t nr,
26 syscall_arg_t u, syscall_arg_t v, syscall_arg_t w,
27 syscall_arg_t x, syscall_arg_t y, syscall_arg_t z)
33 if (!libc.has_thread_pointer || (st=(self=__pthread_self())->canceldisable)
34 && (st==PTHREAD_CANCEL_DISABLE || nr==SYS_close))
35 return __syscall(nr, u, v, w, x, y, z);
37 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
38 if (r==-EINTR && nr!=SYS_close && self->cancel &&
39 self->canceldisable != PTHREAD_CANCEL_DISABLE)
44 static void _sigaddset(sigset_t *set, int sig)
47 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
50 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
52 pthread_t self = __pthread_self();
54 const char *ip = ((char **)&uc->uc_mcontext)[CANCEL_REG_IP];
55 extern const char __cp_begin[1], __cp_end[1];
58 if (!self->cancel || self->canceldisable == PTHREAD_CANCEL_DISABLE) return;
60 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
62 if (self->cancelasync || ip >= __cp_begin && ip < __cp_end) {
63 ((char **)&uc->uc_mcontext)[CANCEL_REG_IP] = (char *)__cp_cancel;
67 __syscall(SYS_tkill, self->tid, SIGCANCEL);
72 if (!libc.has_thread_pointer) return;
73 pthread_t self = __pthread_self();
74 if (self->cancel && !self->canceldisable)
78 static void init_cancellation()
80 struct sigaction sa = {
81 .sa_flags = SA_SIGINFO | SA_RESTART,
82 .sa_sigaction = cancel_handler
84 memset(&sa.sa_mask, -1, _NSIG/8);
85 __libc_sigaction(SIGCANCEL, &sa, 0);
88 int pthread_cancel(pthread_t t)
95 a_store(&t->cancel, 1);
96 return pthread_kill(t, SIGCANCEL);