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