3 #include "pthread_impl.h"
8 __attribute__((__visibility__("hidden")))
10 long __cancel(), __cp_cancel(), __syscall_cp_asm(), __syscall_cp_c();
14 pthread_t self = __pthread_self();
15 if (self->canceldisable == PTHREAD_CANCEL_ENABLE || self->cancelasync)
16 pthread_exit(PTHREAD_CANCELED);
17 self->canceldisable = PTHREAD_CANCEL_DISABLE;
21 /* If __syscall_cp_asm has adjusted the stack pointer, it must provide a
22 * definition of __cp_cancel to undo those adjustments and call __cancel.
23 * Otherwise, __cancel provides a definition for __cp_cancel. */
25 weak_alias(__cancel, __cp_cancel);
27 long __syscall_cp_asm(volatile void *, syscall_arg_t,
28 syscall_arg_t, syscall_arg_t, syscall_arg_t,
29 syscall_arg_t, syscall_arg_t, syscall_arg_t);
31 long __syscall_cp_c(syscall_arg_t nr,
32 syscall_arg_t u, syscall_arg_t v, syscall_arg_t w,
33 syscall_arg_t x, syscall_arg_t y, syscall_arg_t z)
39 if ((st=(self=__pthread_self())->canceldisable)
40 && (st==PTHREAD_CANCEL_DISABLE || nr==SYS_close))
41 return __syscall(nr, u, v, w, x, y, z);
43 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
44 if (r==-EINTR && nr!=SYS_close && self->cancel &&
45 self->canceldisable != PTHREAD_CANCEL_DISABLE)
50 static void _sigaddset(sigset_t *set, int sig)
53 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
57 __attribute__((__visibility__("hidden")))
59 extern const char __cp_begin[1], __cp_end[1];
61 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
63 pthread_t self = __pthread_self();
65 uintptr_t pc = uc->uc_mcontext.MC_PC;
68 if (!self->cancel || self->canceldisable == PTHREAD_CANCEL_DISABLE) return;
70 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
72 if (self->cancelasync || pc >= (uintptr_t)__cp_begin && pc < (uintptr_t)__cp_end) {
73 uc->uc_mcontext.MC_PC = (uintptr_t)__cp_cancel;
77 __syscall(SYS_tkill, self->tid, SIGCANCEL);
82 pthread_t self = __pthread_self();
83 if (self->cancel && !self->canceldisable)
87 static void init_cancellation()
89 struct sigaction sa = {
90 .sa_flags = SA_SIGINFO | SA_RESTART,
91 .sa_sigaction = cancel_handler
93 memset(&sa.sa_mask, -1, _NSIG/8);
94 __libc_sigaction(SIGCANCEL, &sa, 0);
97 int pthread_cancel(pthread_t t)
104 a_store(&t->cancel, 1);
105 return pthread_kill(t, SIGCANCEL);