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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