Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 1 | #include "pthread_impl.h" |
| 2 | |
Rich Felker | b2486a8 | 2011-04-06 20:27:07 -0400 | [diff] [blame^] | 3 | static void dummy_0() |
| 4 | { |
| 5 | } |
| 6 | weak_alias(dummy_0, __rsyscall_lock); |
| 7 | weak_alias(dummy_0, __rsyscall_unlock); |
| 8 | |
Rich Felker | fd80cfa | 2011-04-03 02:33:50 -0400 | [diff] [blame] | 9 | static void dummy_1(pthread_t self) |
| 10 | { |
| 11 | } |
| 12 | weak_alias(dummy_1, __pthread_tsd_run_dtors); |
Rich Felker | f01d351 | 2011-04-03 12:03:58 -0400 | [diff] [blame] | 13 | weak_alias(dummy_1, __sigtimer_handler); |
Rich Felker | fd80cfa | 2011-04-03 02:33:50 -0400 | [diff] [blame] | 14 | |
Rich Felker | ea34336 | 2011-03-25 22:13:57 -0400 | [diff] [blame] | 15 | #ifdef __pthread_unwind_next |
| 16 | #undef __pthread_unwind_next |
| 17 | #define __pthread_unwind_next __pthread_unwind_next_3 |
| 18 | #endif |
| 19 | |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 20 | void __pthread_unwind_next(struct __ptcb *cb) |
| 21 | { |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 22 | pthread_t self; |
| 23 | |
| 24 | if (cb->__next) longjmp((void *)cb->__next->__jb, 1); |
| 25 | |
| 26 | self = pthread_self(); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 27 | |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 28 | LOCK(&self->exitlock); |
| 29 | |
Rich Felker | fd80cfa | 2011-04-03 02:33:50 -0400 | [diff] [blame] | 30 | __pthread_tsd_run_dtors(self); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 31 | |
Rich Felker | 5fcebcd | 2011-03-10 18:31:37 -0500 | [diff] [blame] | 32 | /* Mark this thread dead before decrementing count */ |
| 33 | self->dead = 1; |
Rich Felker | 19eb13b | 2011-02-19 11:04:36 -0500 | [diff] [blame] | 34 | |
Rich Felker | fb11b6b | 2011-02-19 10:38:57 -0500 | [diff] [blame] | 35 | if (!a_fetch_add(&libc.threads_minus_1, -1)) |
| 36 | exit(0); |
| 37 | |
Rich Felker | 5fcebcd | 2011-03-10 18:31:37 -0500 | [diff] [blame] | 38 | if (self->detached && self->map_base) { |
Rich Felker | 74950b3 | 2011-04-06 19:47:50 -0400 | [diff] [blame] | 39 | __syscall(__NR_rt_sigprocmask, SIG_BLOCK, (long)(uint64_t[1]){-1},0,8); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 40 | __unmapself(self->map_base, self->map_size); |
Rich Felker | 5fcebcd | 2011-03-10 18:31:37 -0500 | [diff] [blame] | 41 | } |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 42 | |
Rich Felker | 74950b3 | 2011-04-06 19:47:50 -0400 | [diff] [blame] | 43 | __syscall(SYS_exit, 0); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 44 | } |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 45 | |
| 46 | static void docancel(struct pthread *self) |
| 47 | { |
| 48 | struct __ptcb cb = { .__next = self->cancelbuf }; |
Rich Felker | b470030 | 2011-03-24 14:18:00 -0400 | [diff] [blame] | 49 | self->canceldisable = 1; |
| 50 | self->cancelasync = 0; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 51 | __pthread_unwind_next(&cb); |
| 52 | } |
| 53 | |
| 54 | static void cancel_handler(int sig, siginfo_t *si, void *ctx) |
| 55 | { |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 56 | struct pthread *self = __pthread_self(); |
Rich Felker | f01d351 | 2011-04-03 12:03:58 -0400 | [diff] [blame] | 57 | if (si->si_code == SI_TIMER) __sigtimer_handler(self); |
| 58 | if (self->cancel && !self->canceldisable && |
| 59 | (self->cancelasync || (self->cancelpoint==1 && PC_AT_SYS(ctx)))) |
Rich Felker | b470030 | 2011-03-24 14:18:00 -0400 | [diff] [blame] | 60 | docancel(self); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 61 | } |
| 62 | |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 63 | static void cancelpt(int x) |
| 64 | { |
| 65 | struct pthread *self = __pthread_self(); |
Rich Felker | 729cb49 | 2011-04-05 18:00:28 -0400 | [diff] [blame] | 66 | switch (x) { |
| 67 | case 1: |
| 68 | self->cancelpoint++; |
| 69 | case 0: |
| 70 | if (self->cancel && self->cancelpoint==1 && !self->canceldisable) |
| 71 | docancel(self); |
| 72 | break; |
| 73 | case -1: |
| 74 | self->cancelpoint--; |
| 75 | break; |
| 76 | default: |
| 77 | self->canceldisable += x; |
| 78 | } |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 79 | } |
| 80 | |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 81 | static void init_threads() |
| 82 | { |
| 83 | struct sigaction sa = { .sa_flags = SA_SIGINFO | SA_RESTART }; |
| 84 | libc.lock = __lock; |
Rich Felker | 5eb0d33 | 2011-03-12 21:55:45 -0500 | [diff] [blame] | 85 | libc.lockfile = __lockfile; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 86 | libc.cancelpt = cancelpt; |
Rich Felker | 66def4e | 2011-04-03 13:15:42 -0400 | [diff] [blame] | 87 | |
| 88 | sigemptyset(&sa.sa_mask); |
| 89 | sa.sa_sigaction = cancel_handler; |
| 90 | __libc_sigaction(SIGCANCEL, &sa, 0); |
| 91 | |
| 92 | sigaddset(&sa.sa_mask, SIGSYSCALL); |
| 93 | sigaddset(&sa.sa_mask, SIGCANCEL); |
| 94 | __libc_sigprocmask(SIG_UNBLOCK, &sa.sa_mask, 0); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static int start(void *p) |
| 98 | { |
| 99 | struct pthread *self = p; |
Rich Felker | bf619d8 | 2011-03-29 12:58:22 -0400 | [diff] [blame] | 100 | if (self->unblock_cancel) { |
| 101 | sigset_t set; |
| 102 | sigemptyset(&set); |
| 103 | sigaddset(&set, SIGCANCEL); |
| 104 | __libc_sigprocmask(SIG_UNBLOCK, &set, 0); |
| 105 | } |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 106 | pthread_exit(self->start(self->start_arg)); |
| 107 | return 0; |
| 108 | } |
| 109 | |
Rich Felker | 0b2006c | 2011-02-15 03:24:58 -0500 | [diff] [blame] | 110 | int __uniclone(void *, int (*)(), void *); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 111 | |
| 112 | #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE) |
| 113 | |
| 114 | /* pthread_key_create.c overrides this */ |
| 115 | static const size_t dummy = 0; |
| 116 | weak_alias(dummy, __pthread_tsd_size); |
| 117 | |
| 118 | int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg) |
| 119 | { |
| 120 | static int init; |
| 121 | int ret; |
| 122 | size_t size, guard; |
| 123 | struct pthread *self = pthread_self(), *new; |
| 124 | unsigned char *map, *stack, *tsd; |
Rich Felker | b2486a8 | 2011-04-06 20:27:07 -0400 | [diff] [blame^] | 125 | const pthread_attr_t default_attr = { 0 }; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 126 | |
Rich Felker | 7fd3995 | 2011-04-03 16:15:15 -0400 | [diff] [blame] | 127 | if (!self) return ENOSYS; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 128 | if (!init && ++init) init_threads(); |
| 129 | |
| 130 | if (!attr) attr = &default_attr; |
Rich Felker | e882756 | 2011-02-17 17:16:20 -0500 | [diff] [blame] | 131 | guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE); |
| 132 | size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 133 | size += __pthread_tsd_size; |
| 134 | map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0); |
| 135 | if (!map) return EAGAIN; |
Rich Felker | 29fae65 | 2011-03-16 11:36:21 -0400 | [diff] [blame] | 136 | if (guard) mprotect(map, guard, PROT_NONE); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 137 | |
| 138 | tsd = map + size - __pthread_tsd_size; |
| 139 | new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new); |
| 140 | new->map_base = map; |
| 141 | new->map_size = size; |
| 142 | new->pid = self->pid; |
| 143 | new->errno_ptr = &new->errno_val; |
| 144 | new->start = entry; |
| 145 | new->start_arg = arg; |
| 146 | new->self = new; |
| 147 | new->tsd = (void *)tsd; |
Rich Felker | e882756 | 2011-02-17 17:16:20 -0500 | [diff] [blame] | 148 | new->detached = attr->_a_detach; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 149 | new->attr = *attr; |
Rich Felker | bf619d8 | 2011-03-29 12:58:22 -0400 | [diff] [blame] | 150 | new->unblock_cancel = self->cancel; |
Rich Felker | 4ae5e81 | 2011-04-01 22:15:03 -0400 | [diff] [blame] | 151 | new->result = PTHREAD_CANCELED; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 152 | memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc); |
| 153 | new->tlsdesc[1] = (uintptr_t)new; |
| 154 | stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15); |
| 155 | |
Rich Felker | b2486a8 | 2011-04-06 20:27:07 -0400 | [diff] [blame^] | 156 | __rsyscall_lock(); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 157 | |
| 158 | a_inc(&libc.threads_minus_1); |
Rich Felker | 0b2006c | 2011-02-15 03:24:58 -0500 | [diff] [blame] | 159 | ret = __uniclone(stack, start, new); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 160 | |
Rich Felker | b2486a8 | 2011-04-06 20:27:07 -0400 | [diff] [blame^] | 161 | __rsyscall_unlock(); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 162 | |
| 163 | if (ret < 0) { |
| 164 | a_dec(&libc.threads_minus_1); |
| 165 | munmap(map, size); |
Rich Felker | 5966680 | 2011-02-15 02:20:21 -0500 | [diff] [blame] | 166 | return EAGAIN; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 167 | } |
| 168 | *res = new; |
| 169 | return 0; |
| 170 | } |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 171 | |
| 172 | void pthread_exit(void *result) |
| 173 | { |
| 174 | struct pthread *self = pthread_self(); |
| 175 | self->result = result; |
| 176 | docancel(self); |
| 177 | } |