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 void __pthread_do_register(struct __ptcb *cb)
44 struct pthread *self = pthread_self();
45 cb->__next = self->cancelbuf;
49 void __pthread_do_unregister(struct __ptcb *cb)
51 struct pthread *self = __pthread_self();
52 self->cancelbuf = self->cancelbuf->__next;
55 static void start(pthread_t self)
57 if (self->unblock_cancel)
58 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
59 pthread_exit(self->start(self->start_arg));
62 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
64 /* pthread_key_create.c overrides this */
65 static const size_t dummy = 0;
66 weak_alias(dummy, __pthread_tsd_size);
68 static FILE *const dummy_file = 0;
69 weak_alias(dummy_file, __stdin_used);
70 weak_alias(dummy_file, __stdout_used);
71 weak_alias(dummy_file, __stderr_used);
73 static void init_file_lock(FILE *f)
75 if (f && f->lock<0) f->lock = 0;
78 int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
81 size_t size = DEFAULT_STACK_SIZE + DEFAULT_GUARD_SIZE;
82 size_t guard = DEFAULT_GUARD_SIZE;
83 struct pthread *self = pthread_self(), *new;
84 unsigned char *map, *stack, *tsd;
86 if (!self) return ENOSYS;
88 for (FILE *f=libc.ofl_head; f; f=f->next)
90 init_file_lock(__stdin_used);
91 init_file_lock(__stdout_used);
92 init_file_lock(__stderr_used);
93 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
98 guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
99 size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
101 size += __pthread_tsd_size;
102 map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0);
103 if (!map) return EAGAIN;
104 if (guard) mprotect(map, guard, PROT_NONE);
106 tsd = map + size - __pthread_tsd_size;
107 new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
109 new->map_size = size;
110 new->pid = self->pid;
111 new->errno_ptr = &new->errno_val;
113 new->start_arg = arg;
115 new->tsd = (void *)tsd;
116 if (attr) new->detached = attr->_a_detach;
117 new->unblock_cancel = self->cancel;
118 memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc);
119 new->tlsdesc[1] = (uintptr_t)new;
120 stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15);
124 a_inc(&libc.threads_minus_1);
125 ret = __uniclone(stack, start, new);
130 a_dec(&libc.threads_minus_1);
138 void pthread_exit(void *result)
140 struct pthread *self = pthread_self();
141 struct __ptcb cb = { .__next = self->cancelbuf };
142 self->result = result;
143 __pthread_do_unwind(&cb);