[398] | 1 | #include <time.h>
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| 2 | #include <setjmp.h>
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| 3 | #include "pthread_impl.h"
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| 4 |
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| 5 | struct ksigevent {
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| 6 | union sigval sigev_value;
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| 7 | int sigev_signo;
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| 8 | int sigev_notify;
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| 9 | int sigev_tid;
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| 10 | };
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| 11 |
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| 12 | struct start_args {
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| 13 | pthread_barrier_t b;
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| 14 | struct sigevent *sev;
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| 15 | };
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| 16 |
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| 17 | static void dummy_1(pthread_t self)
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| 18 | {
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| 19 | }
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| 20 | weak_alias(dummy_1, __pthread_tsd_run_dtors);
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| 21 |
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| 22 | void __reset_tls();
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| 23 |
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| 24 | static void cleanup_fromsig(void *p)
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| 25 | {
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| 26 | pthread_t self = __pthread_self();
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| 27 | __pthread_tsd_run_dtors(self);
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| 28 | self->cancel = 0;
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| 29 | self->cancelbuf = 0;
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| 30 | self->canceldisable = 0;
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| 31 | self->cancelasync = 0;
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| 32 | self->unblock_cancel = 0;
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| 33 | __reset_tls();
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| 34 | longjmp(p, 1);
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| 35 | }
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| 36 |
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| 37 | static void timer_handler(int sig, siginfo_t *si, void *ctx)
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| 38 | {
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| 39 | pthread_t self = __pthread_self();
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| 40 | jmp_buf jb;
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| 41 | void (*notify)(union sigval) = (void (*)(union sigval))self->start;
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| 42 | union sigval val = { .sival_ptr = self->start_arg };
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| 43 |
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| 44 | if (!setjmp(jb) && si->si_code == SI_TIMER) {
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| 45 | pthread_cleanup_push(cleanup_fromsig, jb);
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| 46 | notify(val);
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| 47 | pthread_cleanup_pop(1);
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| 48 | }
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| 49 | }
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| 50 |
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| 51 | static void install_handler()
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| 52 | {
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| 53 | struct sigaction sa = {
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| 54 | .sa_sigaction = timer_handler,
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| 55 | .sa_flags = SA_SIGINFO | SA_RESTART
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| 56 | };
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| 57 | __libc_sigaction(SIGTIMER, &sa, 0);
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| 58 | }
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| 59 |
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| 60 | static void *start(void *arg)
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| 61 | {
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| 62 | pthread_t self = __pthread_self();
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| 63 | struct start_args *args = arg;
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| 64 | int id;
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| 65 |
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| 66 | /* Reuse no-longer-needed thread structure fields to avoid
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| 67 | * needing the timer address in the signal handler. */
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| 68 | self->start = (void *(*)(void *))args->sev->sigev_notify_function;
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| 69 | self->start_arg = args->sev->sigev_value.sival_ptr;
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| 70 |
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| 71 | pthread_barrier_wait(&args->b);
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| 72 | if ((id = self->timer_id) >= 0) {
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| 73 | __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
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| 74 | SIGTIMER_SET, 0, _NSIG/8);
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| 75 | __wait(&self->timer_id, 0, id, 1);
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| 76 | __syscall(SYS_timer_delete, id);
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| 77 | }
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| 78 | return 0;
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| 79 | }
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| 80 |
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| 81 | int timer_create(clockid_t clk, struct sigevent *restrict evp, timer_t *restrict res)
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| 82 | {
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| 83 | static pthread_once_t once = PTHREAD_ONCE_INIT;
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| 84 | pthread_t td;
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| 85 | pthread_attr_t attr;
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| 86 | int r;
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| 87 | struct start_args args;
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| 88 | struct ksigevent ksev, *ksevp=0;
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| 89 | int timerid;
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| 90 | sigset_t set;
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| 91 |
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| 92 | switch (evp ? evp->sigev_notify : SIGEV_SIGNAL) {
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| 93 | case SIGEV_NONE:
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| 94 | case SIGEV_SIGNAL:
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| 95 | if (evp) {
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| 96 | ksev.sigev_value = evp->sigev_value;
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| 97 | ksev.sigev_signo = evp->sigev_signo;
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| 98 | ksev.sigev_notify = evp->sigev_notify;
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| 99 | ksev.sigev_tid = 0;
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| 100 | ksevp = &ksev;
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| 101 | }
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| 102 | if (syscall(SYS_timer_create, clk, ksevp, &timerid) < 0)
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| 103 | return -1;
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| 104 | *res = (void *)(intptr_t)timerid;
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| 105 | break;
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| 106 | case SIGEV_THREAD:
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| 107 | pthread_once(&once, install_handler);
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| 108 | if (evp->sigev_notify_attributes)
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| 109 | attr = *evp->sigev_notify_attributes;
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| 110 | else
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| 111 | pthread_attr_init(&attr);
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| 112 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
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| 113 | pthread_barrier_init(&args.b, 0, 2);
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| 114 | args.sev = evp;
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| 115 |
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| 116 | __block_app_sigs(&set);
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| 117 | r = pthread_create(&td, &attr, start, &args);
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| 118 | __restore_sigs(&set);
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| 119 | if (r) {
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| 120 | errno = r;
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| 121 | return -1;
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| 122 | }
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| 123 |
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| 124 | ksev.sigev_value.sival_ptr = 0;
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| 125 | ksev.sigev_signo = SIGTIMER;
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| 126 | ksev.sigev_notify = 4; /* SIGEV_THREAD_ID */
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| 127 | ksev.sigev_tid = td->tid;
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| 128 | if (syscall(SYS_timer_create, clk, &ksev, &timerid) < 0)
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| 129 | timerid = -1;
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| 130 | td->timer_id = timerid;
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| 131 | pthread_barrier_wait(&args.b);
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| 132 | if (timerid < 0) return -1;
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| 133 | *res = (void *)(INTPTR_MIN | (uintptr_t)td>>1);
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| 134 | break;
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| 135 | default:
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| 136 | errno = EINVAL;
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| 137 | return -1;
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| 138 | }
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| 139 |
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| 140 | return 0;
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| 141 | }
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