3 #include "pthread_impl.h"
7 hidden long __cancel(), __syscall_cp_asm(), __syscall_cp_c();
11 pthread_t self = __pthread_self();
12 if (self->canceldisable == PTHREAD_CANCEL_ENABLE || self->cancelasync)
13 pthread_exit(PTHREAD_CANCELED);
14 self->canceldisable = PTHREAD_CANCEL_DISABLE;
18 long __syscall_cp_asm(volatile void *, syscall_arg_t,
19 syscall_arg_t, syscall_arg_t, syscall_arg_t,
20 syscall_arg_t, syscall_arg_t, syscall_arg_t);
22 long __syscall_cp_c(syscall_arg_t nr,
23 syscall_arg_t u, syscall_arg_t v, syscall_arg_t w,
24 syscall_arg_t x, syscall_arg_t y, syscall_arg_t z)
30 if ((st=(self=__pthread_self())->canceldisable)
31 && (st==PTHREAD_CANCEL_DISABLE || nr==SYS_close))
32 return __syscall(nr, u, v, w, x, y, z);
34 r = __syscall_cp_asm(&self->cancel, nr, u, v, w, x, y, z);
35 if (r==-EINTR && nr!=SYS_close && self->cancel &&
36 self->canceldisable != PTHREAD_CANCEL_DISABLE)
41 static void _sigaddset(sigset_t *set, int sig)
44 set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
47 extern hidden const char __cp_begin[1], __cp_end[1], __cp_cancel[1];
49 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
51 pthread_t self = __pthread_self();
53 uintptr_t pc = uc->uc_mcontext.MC_PC;
56 if (!self->cancel || self->canceldisable == PTHREAD_CANCEL_DISABLE) return;
58 _sigaddset(&uc->uc_sigmask, SIGCANCEL);
60 if (self->cancelasync || pc >= (uintptr_t)__cp_begin && pc < (uintptr_t)__cp_end) {
61 uc->uc_mcontext.MC_PC = (uintptr_t)__cp_cancel;
63 uc->uc_mcontext.MC_GOT = CANCEL_GOT;
68 __syscall(SYS_tkill, self->tid, SIGCANCEL);
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 if (t == pthread_self()) {
97 if (t->canceldisable == PTHREAD_CANCEL_ENABLE && t->cancelasync)
98 pthread_exit(PTHREAD_CANCELED);
101 return pthread_kill(t, SIGCANCEL);