1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
| | #include "pthread_impl.h"
#include "stdio_impl.h"
static void dummy_0()
{
}
weak_alias(dummy_0, __synccall_lock);
weak_alias(dummy_0, __synccall_unlock);
weak_alias(dummy_0, __pthread_tsd_run_dtors);
void pthread_exit(void *result)
{
pthread_t self = pthread_self();
int n;
self->result = result;
while (self->cancelbuf) {
void (*f)(void *) = self->cancelbuf->__f;
void *x = self->cancelbuf->__x;
self->cancelbuf = self->cancelbuf->__next;
f(x);
}
__pthread_tsd_run_dtors();
__lock(self->exitlock);
/* Mark this thread dead before decrementing count */
__lock(self->killlock);
self->dead = 1;
__unlock(self->killlock);
do n = libc.threads_minus_1;
while (n && a_cas(&libc.threads_minus_1, n, n-1)!=n);
if (!n) exit(0);
if (self->detached && self->map_base) {
if (self->detached == 2)
__syscall(SYS_set_tid_address, 0);
__syscall(SYS_rt_sigprocmask, SIG_BLOCK,
SIGALL_SET, 0, __SYSCALL_SSLEN);
__unmapself(self->map_base, self->map_size);
}
__syscall(SYS_exit, 0);
}
void __do_cleanup_push(struct __ptcb *cb)
{
struct pthread *self = pthread_self();
cb->__next = self->cancelbuf;
self->cancelbuf = cb;
}
void __do_cleanup_pop(struct __ptcb *cb)
{
__pthread_self()->cancelbuf = cb->__next;
}
static int start(void *p)
{
pthread_t self = p;
if (self->unblock_cancel)
__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
SIGPT_SET, 0, __SYSCALL_SSLEN);
pthread_exit(self->start(self->start_arg));
return 0;
}
#define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
/* pthread_key_create.c overrides this */
static const size_t dummy = 0;
weak_alias(dummy, __pthread_tsd_size);
static FILE *const dummy_file = 0;
weak_alias(dummy_file, __stdin_used);
weak_alias(dummy_file, __stdout_used);
weak_alias(dummy_file, __stderr_used);
static void init_file_lock(FILE *f)
{
if (f && f->lock<0) f->lock = 0;
}
int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
{
int ret;
size_t size = DEFAULT_STACK_SIZE + DEFAULT_GUARD_SIZE;
size_t guard = DEFAULT_GUARD_SIZE;
struct pthread *self = pthread_self(), *new;
unsigned char *map, *stack, *tsd;
unsigned flags = 0x7d8f00;
if (!self) return ENOSYS;
if (!libc.threaded) {
for (FILE *f=libc.ofl_head; f; f=f->next)
init_file_lock(f);
init_file_lock(__stdin_used);
init_file_lock(__stdout_used);
init_file_lock(__stderr_used);
libc.threaded = 1;
}
if (attr && attr->_a_stackaddr) {
map = 0;
tsd = (void *)(attr->_a_stackaddr-__pthread_tsd_size & -16);
} else {
if (attr) {
guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
}
size += __pthread_tsd_size;
map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
if (map == MAP_FAILED) return EAGAIN;
if (guard) mprotect(map, guard, PROT_NONE);
tsd = map + size - __pthread_tsd_size;
}
new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
new->map_base = map;
new->map_size = size;
new->pid = self->pid;
new->errno_ptr = &new->errno_val;
new->start = entry;
new->start_arg = arg;
new->self = new;
new->tsd = (void *)tsd;
if (attr && attr->_a_detach) {
new->detached = 1;
flags -= 0x200000;
}
new->unblock_cancel = self->cancel;
new->canary = self->canary ^ (uintptr_t)&new;
stack = (void *)new;
__synccall_lock();
a_inc(&libc.threads_minus_1);
ret = __clone(start, stack, flags, new, &new->tid, new, &new->tid);
__synccall_unlock();
if (ret < 0) {
a_dec(&libc.threads_minus_1);
munmap(map, size);
return EAGAIN;
}
*res = new;
return 0;
}
|