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 #ifdef FEATURE_PTHREAD_CANCEL
29 self->cancel = 0;
30 self->canceldisable = 0;
31 self->cancelasync = 0;
32 #endif
33 self->cancelbuf = 0;
34 __reset_tls();
35 longjmp(p, 1);
36 }
37
start(void * arg)38 static void *start(void *arg)
39 {
40 pthread_t self = __pthread_self();
41 struct start_args *args = arg;
42 jmp_buf jb;
43
44 void (*notify)(union sigval) = args->sev->sigev_notify_function;
45 union sigval val = args->sev->sigev_value;
46
47 pthread_barrier_wait(&args->b);
48 for (;;) {
49 siginfo_t si;
50 while (sigwaitinfo(SIGTIMER_SET, &si) < 0);
51 if (si.si_code == SI_TIMER && !setjmp(jb)) {
52 pthread_cleanup_push(cleanup_fromsig, jb);
53 notify(val);
54 pthread_cleanup_pop(1);
55 }
56 if (self->timer_id < 0) break;
57 }
58 __syscall(SYS_timer_delete, self->timer_id & INT_MAX);
59 return 0;
60 }
61
timer_create(clockid_t clk,struct sigevent * restrict evp,timer_t * restrict res)62 int timer_create(clockid_t clk, struct sigevent *restrict evp, timer_t *restrict res)
63 {
64 volatile static int init = 0;
65 pthread_t td;
66 pthread_attr_t attr;
67 int r;
68 struct start_args args;
69 struct ksigevent ksev, *ksevp=0;
70 int timerid;
71 sigset_t set;
72
73 switch (evp ? evp->sigev_notify : SIGEV_SIGNAL) {
74 case SIGEV_NONE:
75 case SIGEV_SIGNAL:
76 case SIGEV_THREAD_ID:
77 if (evp) {
78 ksev.sigev_value = evp->sigev_value;
79 ksev.sigev_signo = evp->sigev_signo;
80 ksev.sigev_notify = evp->sigev_notify;
81 if (evp->sigev_notify == SIGEV_THREAD_ID)
82 ksev.sigev_tid = evp->sigev_notify_thread_id;
83 else
84 ksev.sigev_tid = 0;
85 ksevp = &ksev;
86 }
87 if (syscall(SYS_timer_create, clk, ksevp, &timerid) < 0)
88 return -1;
89 *res = (void *)(intptr_t)timerid;
90 break;
91 case SIGEV_THREAD:
92 if (!init) {
93 struct sigaction sa = { .sa_handler = SIG_DFL };
94 __libc_sigaction(SIGTIMER, &sa, 0);
95 a_store(&init, 1);
96 }
97 if (evp->sigev_notify_attributes)
98 attr = *evp->sigev_notify_attributes;
99 else
100 pthread_attr_init(&attr);
101 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
102 pthread_barrier_init(&args.b, 0, 2);
103 args.sev = evp;
104
105 __block_app_sigs(&set);
106 __syscall(SYS_rt_sigprocmask, SIG_BLOCK, SIGTIMER_SET, 0, _NSIG/8);
107 r = pthread_create(&td, &attr, start, &args);
108 __restore_sigs(&set);
109 if (r) {
110 errno = r;
111 return -1;
112 }
113
114 ksev.sigev_value.sival_ptr = 0;
115 ksev.sigev_signo = SIGTIMER;
116 ksev.sigev_notify = SIGEV_THREAD_ID;
117 ksev.sigev_tid = td->tid;
118 if (syscall(SYS_timer_create, clk, &ksev, &timerid) < 0)
119 timerid = -1;
120 td->timer_id = timerid;
121 pthread_barrier_wait(&args.b);
122 if (timerid < 0) return -1;
123 *res = (void *)(INTPTR_MIN | (uintptr_t)td>>1);
124 break;
125 default:
126 errno = EINVAL;
127 return -1;
128 }
129
130 return 0;
131 }
132