1 #include "pthread_impl.h"
2 #include "stdio_impl.h"
7 weak_alias(dummy_0, __synccall_lock);
8 weak_alias(dummy_0, __synccall_unlock);
9 weak_alias(dummy_0, __pthread_tsd_run_dtors);
11 void __pthread_do_unwind(struct __ptcb *cb)
13 pthread_t self = pthread_self();
17 self->cancelbuf = cb->__next->__next;
18 longjmp((void *)cb->__next->__jb, 1);
21 __pthread_tsd_run_dtors();
23 __lock(&self->exitlock);
25 /* Mark this thread dead before decrementing count */
26 __lock(&self->killlock);
28 a_store(&self->killlock, 0);
30 do n = libc.threads_minus_1;
31 while (n && a_cas(&libc.threads_minus_1, n, n-1)!=n);
34 if (self->detached && self->map_base) {
35 __syscall(SYS_rt_sigprocmask, SIG_BLOCK, (uint64_t[]){-1},0,8);
36 __unmapself(self->map_base, self->map_size);
39 __syscall(SYS_exit, 0);
42 static int start(void *p)
44 struct pthread *self = p;
45 if (self->unblock_cancel)
46 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
47 pthread_exit(self->start(self->start_arg));
51 int __uniclone(void *, int (*)(), void *);
53 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
55 /* pthread_key_create.c overrides this */
56 static const size_t dummy = 0;
57 weak_alias(dummy, __pthread_tsd_size);
59 static FILE *const dummy_file = 0;
60 weak_alias(dummy_file, __stdin_used);
61 weak_alias(dummy_file, __stdout_used);
62 weak_alias(dummy_file, __stderr_used);
64 static void init_file_lock(FILE *f)
66 if (f && f->lock<0) f->lock = 0;
69 int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
72 size_t size = DEFAULT_STACK_SIZE + DEFAULT_GUARD_SIZE;
73 size_t guard = DEFAULT_GUARD_SIZE;
74 struct pthread *self = pthread_self(), *new;
75 unsigned char *map, *stack, *tsd;
77 if (!self) return ENOSYS;
79 for (FILE *f=libc.ofl_head; f; f=f->next)
81 init_file_lock(__stdin_used);
82 init_file_lock(__stdout_used);
83 init_file_lock(__stderr_used);
84 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
89 guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
90 size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
92 size += __pthread_tsd_size;
93 map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0);
94 if (!map) return EAGAIN;
95 if (guard) mprotect(map, guard, PROT_NONE);
97 tsd = map + size - __pthread_tsd_size;
98 new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
100 new->map_size = size;
101 new->pid = self->pid;
102 new->errno_ptr = &new->errno_val;
104 new->start_arg = arg;
106 new->tsd = (void *)tsd;
107 if (attr) new->detached = attr->_a_detach;
108 new->unblock_cancel = self->cancel;
109 memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc);
110 new->tlsdesc[1] = (uintptr_t)new;
111 stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15);
115 a_inc(&libc.threads_minus_1);
116 ret = __uniclone(stack, start, new);
121 a_dec(&libc.threads_minus_1);
129 void pthread_exit(void *result)
131 struct pthread *self = pthread_self();
132 struct __ptcb cb = { .__next = self->cancelbuf };
133 self->result = result;
134 __pthread_do_unwind(&cb);