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); |
Rich Felker | a6054e3 | 2011-04-19 23:09:14 -0400 | [diff] [blame^] | 8 | weak_alias(dummy_0, __pthread_tsd_run_dtors); |
Rich Felker | fd80cfa | 2011-04-03 02:33:50 -0400 | [diff] [blame] | 9 | |
Rich Felker | ea34336 | 2011-03-25 22:13:57 -0400 | [diff] [blame] | 10 | #ifdef __pthread_unwind_next |
| 11 | #undef __pthread_unwind_next |
| 12 | #define __pthread_unwind_next __pthread_unwind_next_3 |
| 13 | #endif |
| 14 | |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 15 | void __pthread_unwind_next(struct __ptcb *cb) |
| 16 | { |
Rich Felker | 1ebde9c | 2011-04-17 17:06:05 -0400 | [diff] [blame] | 17 | pthread_t self = pthread_self(); |
Rich Felker | feee989 | 2011-04-17 11:43:03 -0400 | [diff] [blame] | 18 | int n; |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 19 | |
Rich Felker | 1ebde9c | 2011-04-17 17:06:05 -0400 | [diff] [blame] | 20 | if (cb->__next) { |
| 21 | self->cancelbuf = cb->__next->__next; |
| 22 | longjmp((void *)cb->__next->__jb, 1); |
| 23 | } |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 24 | |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 25 | LOCK(&self->exitlock); |
| 26 | |
Rich Felker | a6054e3 | 2011-04-19 23:09:14 -0400 | [diff] [blame^] | 27 | __pthread_tsd_run_dtors(); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 28 | |
Rich Felker | 5fcebcd | 2011-03-10 18:31:37 -0500 | [diff] [blame] | 29 | /* Mark this thread dead before decrementing count */ |
| 30 | self->dead = 1; |
Rich Felker | 19eb13b | 2011-02-19 11:04:36 -0500 | [diff] [blame] | 31 | |
Rich Felker | feee989 | 2011-04-17 11:43:03 -0400 | [diff] [blame] | 32 | do n = libc.threads_minus_1; |
| 33 | while (n && a_cas(&libc.threads_minus_1, n, n-1)!=n); |
| 34 | if (!n) exit(0); |
Rich Felker | fb11b6b | 2011-02-19 10:38:57 -0500 | [diff] [blame] | 35 | |
Rich Felker | 5fcebcd | 2011-03-10 18:31:37 -0500 | [diff] [blame] | 36 | if (self->detached && self->map_base) { |
Rich Felker | c2cd25b | 2011-04-06 20:32:53 -0400 | [diff] [blame] | 37 | __syscall(SYS_rt_sigprocmask, SIG_BLOCK, (long)(uint64_t[1]){-1},0,8); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 38 | __unmapself(self->map_base, self->map_size); |
Rich Felker | 5fcebcd | 2011-03-10 18:31:37 -0500 | [diff] [blame] | 39 | } |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 40 | |
Rich Felker | 74950b3 | 2011-04-06 19:47:50 -0400 | [diff] [blame] | 41 | __syscall(SYS_exit, 0); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 42 | } |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 43 | |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 44 | static int start(void *p) |
| 45 | { |
| 46 | struct pthread *self = p; |
Rich Felker | bf619d8 | 2011-03-29 12:58:22 -0400 | [diff] [blame] | 47 | if (self->unblock_cancel) { |
| 48 | sigset_t set; |
| 49 | sigemptyset(&set); |
| 50 | sigaddset(&set, SIGCANCEL); |
| 51 | __libc_sigprocmask(SIG_UNBLOCK, &set, 0); |
| 52 | } |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 53 | pthread_exit(self->start(self->start_arg)); |
| 54 | return 0; |
| 55 | } |
| 56 | |
Rich Felker | 0b2006c | 2011-02-15 03:24:58 -0500 | [diff] [blame] | 57 | int __uniclone(void *, int (*)(), void *); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 58 | |
| 59 | #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE) |
| 60 | |
| 61 | /* pthread_key_create.c overrides this */ |
| 62 | static const size_t dummy = 0; |
| 63 | weak_alias(dummy, __pthread_tsd_size); |
| 64 | |
| 65 | int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg) |
| 66 | { |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 67 | int ret; |
| 68 | size_t size, guard; |
| 69 | struct pthread *self = pthread_self(), *new; |
| 70 | unsigned char *map, *stack, *tsd; |
Rich Felker | b2486a8 | 2011-04-06 20:27:07 -0400 | [diff] [blame] | 71 | const pthread_attr_t default_attr = { 0 }; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 72 | |
Rich Felker | 7fd3995 | 2011-04-03 16:15:15 -0400 | [diff] [blame] | 73 | if (!self) return ENOSYS; |
Rich Felker | 9080cc1 | 2011-04-17 16:53:54 -0400 | [diff] [blame] | 74 | if (!libc.threaded) { |
| 75 | sigset_t set; |
| 76 | sigemptyset(&set); |
| 77 | sigaddset(&set, SIGSYSCALL); |
| 78 | sigaddset(&set, SIGCANCEL); |
| 79 | __libc_sigprocmask(SIG_UNBLOCK, &set, 0); |
| 80 | libc.threaded = 1; |
| 81 | } |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 82 | |
| 83 | if (!attr) attr = &default_attr; |
Rich Felker | e882756 | 2011-02-17 17:16:20 -0500 | [diff] [blame] | 84 | guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE); |
| 85 | size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 86 | size += __pthread_tsd_size; |
| 87 | map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0); |
| 88 | if (!map) return EAGAIN; |
Rich Felker | 29fae65 | 2011-03-16 11:36:21 -0400 | [diff] [blame] | 89 | if (guard) mprotect(map, guard, PROT_NONE); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 90 | |
| 91 | tsd = map + size - __pthread_tsd_size; |
| 92 | new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new); |
| 93 | new->map_base = map; |
| 94 | new->map_size = size; |
| 95 | new->pid = self->pid; |
| 96 | new->errno_ptr = &new->errno_val; |
| 97 | new->start = entry; |
| 98 | new->start_arg = arg; |
| 99 | new->self = new; |
| 100 | new->tsd = (void *)tsd; |
Rich Felker | e882756 | 2011-02-17 17:16:20 -0500 | [diff] [blame] | 101 | new->detached = attr->_a_detach; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 102 | new->attr = *attr; |
Rich Felker | bf619d8 | 2011-03-29 12:58:22 -0400 | [diff] [blame] | 103 | new->unblock_cancel = self->cancel; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 104 | memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc); |
| 105 | new->tlsdesc[1] = (uintptr_t)new; |
| 106 | stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15); |
| 107 | |
Rich Felker | b2486a8 | 2011-04-06 20:27:07 -0400 | [diff] [blame] | 108 | __rsyscall_lock(); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 109 | |
| 110 | a_inc(&libc.threads_minus_1); |
Rich Felker | 0b2006c | 2011-02-15 03:24:58 -0500 | [diff] [blame] | 111 | ret = __uniclone(stack, start, new); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 112 | |
Rich Felker | b2486a8 | 2011-04-06 20:27:07 -0400 | [diff] [blame] | 113 | __rsyscall_unlock(); |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 114 | |
| 115 | if (ret < 0) { |
| 116 | a_dec(&libc.threads_minus_1); |
| 117 | munmap(map, size); |
Rich Felker | 5966680 | 2011-02-15 02:20:21 -0500 | [diff] [blame] | 118 | return EAGAIN; |
Rich Felker | 0b44a03 | 2011-02-12 00:22:29 -0500 | [diff] [blame] | 119 | } |
| 120 | *res = new; |
| 121 | return 0; |
| 122 | } |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 123 | |
| 124 | void pthread_exit(void *result) |
| 125 | { |
| 126 | struct pthread *self = pthread_self(); |
Rich Felker | feee989 | 2011-04-17 11:43:03 -0400 | [diff] [blame] | 127 | struct __ptcb cb = { .__next = self->cancelbuf }; |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 128 | self->result = result; |
Rich Felker | feee989 | 2011-04-17 11:43:03 -0400 | [diff] [blame] | 129 | __pthread_unwind_next(&cb); |
Rich Felker | 1a9a2ff | 2011-02-13 19:58:30 -0500 | [diff] [blame] | 130 | } |