1 #include <time.h>
2 #include <setjmp.h>
3 #include <limits.h>
4 #include "pthread_impl.h"
5
6 struct ksigevent {
7 union sigval sigev_value;
8 int sigev_signo;
9 int sigev_notify;
10 int sigev_tid;
11 };
12
13 struct start_args {
14 pthread_barrier_t b;
15 struct sigevent *sev;
16 };
17
dummy_0()18 static void dummy_0()
19 {
20 }
21 weak_alias(dummy_0, __pthread_tsd_run_dtors);
22
cleanup_fromsig(void * p)23 static void cleanup_fromsig(void *p)
24 {
25 pthread_t self = __pthread_self();
26 __pthread_tsd_run_dtors();
27 self->cancel = 0;
28 self->cancelbuf = 0;
29 self->canceldisable = 0;
30 self->cancelasync = 0;
31 __reset_tls();
32 longjmp(p, 1);
33 }
34
timer_handler(int sig,siginfo_t * si,void * ctx)35 static void timer_handler(int sig, siginfo_t *si, void *ctx)
36 {
37 }
38
install_handler()39 static void install_handler()
40 {
41 struct sigaction sa = {
42 .sa_sigaction = timer_handler,
43 .sa_flags = SA_SIGINFO | SA_RESTART
44 };
45 __libc_sigaction(SIGTIMER, &sa, 0);
46 }
47
start(void * arg)48 static void *start(void *arg)
49 {
50 pthread_t self = __pthread_self();
51 struct start_args *args = arg;
52 jmp_buf jb;
53
54 void (*notify)(union sigval) = args->sev->sigev_notify_function;
55 union sigval val = args->sev->sigev_value;
56
57 pthread_barrier_wait(&args->b);
58 for (;;) {
59 siginfo_t si;
60 while (sigwaitinfo(SIGTIMER_SET, &si) < 0);
61 if (si.si_code == SI_TIMER && !setjmp(jb)) {
62 pthread_cleanup_push(cleanup_fromsig, jb);
63 notify(val);
64 pthread_cleanup_pop(1);
65 }
66 if (self->timer_id < 0) break;
67 }
68 __syscall(SYS_timer_delete, self->timer_id & INT_MAX);
69 return 0;
70 }
71
timer_create(clockid_t clk,struct sigevent * restrict evp,timer_t * restrict res)72 int timer_create(clockid_t clk, struct sigevent *restrict evp, timer_t *restrict res)
73 {
74 static pthread_once_t once = PTHREAD_ONCE_INIT;
75 pthread_t td;
76 pthread_attr_t attr;
77 int r;
78 struct start_args args;
79 struct ksigevent ksev, *ksevp=0;
80 int timerid;
81 sigset_t set;
82
83 switch (evp ? evp->sigev_notify : SIGEV_SIGNAL) {
84 case SIGEV_NONE:
85 case SIGEV_SIGNAL:
86 if (evp) {
87 ksev.sigev_value = evp->sigev_value;
88 ksev.sigev_signo = evp->sigev_signo;
89 ksev.sigev_notify = evp->sigev_notify;
90 ksev.sigev_tid = 0;
91 ksevp = &ksev;
92 }
93 if (syscall(SYS_timer_create, clk, ksevp, &timerid) < 0)
94 return -1;
95 *res = (void *)(intptr_t)timerid;
96 break;
97 case SIGEV_THREAD:
98 pthread_once(&once, install_handler);
99 if (evp->sigev_notify_attributes)
100 attr = *evp->sigev_notify_attributes;
101 else
102 pthread_attr_init(&attr);
103 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
104 pthread_barrier_init(&args.b, 0, 2);
105 args.sev = evp;
106
107 __block_app_sigs(&set);
108 __syscall(SYS_rt_sigprocmask, SIG_BLOCK, SIGTIMER_SET, 0, _NSIG/8);
109 r = pthread_create(&td, &attr, start, &args);
110 __restore_sigs(&set);
111 if (r) {
112 errno = r;
113 return -1;
114 }
115
116 ksev.sigev_value.sival_ptr = 0;
117 ksev.sigev_signo = SIGTIMER;
118 ksev.sigev_notify = 4; /* SIGEV_THREAD_ID */
119 ksev.sigev_tid = td->tid;
120 if (syscall(SYS_timer_create, clk, &ksev, &timerid) < 0)
121 timerid = -1;
122 td->timer_id = timerid;
123 pthread_barrier_wait(&args.b);
124 if (timerid < 0) return -1;
125 *res = (void *)(INTPTR_MIN | (uintptr_t)td>>1);
126 break;
127 default:
128 errno = EINVAL;
129 return -1;
130 }
131
132 return 0;
133 }
134