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_exit(void *result)
13 pthread_t self = pthread_self();
16 self->result = result;
18 while (self->cancelbuf) {
19 void (*f)(void *) = self->cancelbuf->__f;
20 void *x = self->cancelbuf->__x;
21 self->cancelbuf = self->cancelbuf->__next;
25 __pthread_tsd_run_dtors();
27 __lock(self->exitlock);
29 /* Mark this thread dead before decrementing count */
30 __lock(self->killlock);
32 __unlock(self->killlock);
34 do n = libc.threads_minus_1;
35 while (n && a_cas(&libc.threads_minus_1, n, n-1)!=n);
38 if (self->detached && self->map_base) {
39 if (self->detached == 2)
40 __syscall(SYS_set_tid_address, 0);
41 __syscall(SYS_rt_sigprocmask, SIG_BLOCK,
42 SIGALL_SET, 0, __SYSCALL_SSLEN);
43 __unmapself(self->map_base, self->map_size);
46 __syscall(SYS_exit, 0);
49 void __do_cleanup_push(struct __ptcb *cb)
51 struct pthread *self = pthread_self();
52 cb->__next = self->cancelbuf;
56 void __do_cleanup_pop(struct __ptcb *cb)
58 __pthread_self()->cancelbuf = cb->__next;
61 static int start(void *p)
64 if (self->unblock_cancel)
65 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
66 SIGPT_SET, 0, __SYSCALL_SSLEN);
67 pthread_exit(self->start(self->start_arg));
71 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
73 /* pthread_key_create.c overrides this */
74 static const size_t dummy = 0;
75 weak_alias(dummy, __pthread_tsd_size);
77 static FILE *const dummy_file = 0;
78 weak_alias(dummy_file, __stdin_used);
79 weak_alias(dummy_file, __stdout_used);
80 weak_alias(dummy_file, __stderr_used);
82 static void init_file_lock(FILE *f)
84 if (f && f->lock<0) f->lock = 0;
87 int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr, void *(*entry)(void *), void *restrict arg)
90 size_t size = DEFAULT_STACK_SIZE + DEFAULT_GUARD_SIZE;
91 size_t guard = DEFAULT_GUARD_SIZE;
92 struct pthread *self = pthread_self(), *new;
93 unsigned char *map, *stack, *tsd;
94 unsigned flags = 0x7d8f00;
96 if (!self) return ENOSYS;
98 for (FILE *f=libc.ofl_head; f; f=f->next)
100 init_file_lock(__stdin_used);
101 init_file_lock(__stdout_used);
102 init_file_lock(__stderr_used);
106 if (attr && attr->_a_stackaddr) {
108 tsd = (void *)(attr->_a_stackaddr-__pthread_tsd_size & -16);
111 guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
112 size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
114 size += __pthread_tsd_size;
115 map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
116 if (map == MAP_FAILED) return EAGAIN;
117 if (guard) mprotect(map, guard, PROT_NONE);
118 tsd = map + size - __pthread_tsd_size;
120 new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
122 new->map_size = size;
123 new->pid = self->pid;
124 new->errno_ptr = &new->errno_val;
126 new->start_arg = arg;
128 new->tsd = (void *)tsd;
129 if (attr && attr->_a_detach) {
133 new->unblock_cancel = self->cancel;
134 new->canary = self->canary ^ (uintptr_t)&new;
139 a_inc(&libc.threads_minus_1);
140 ret = __clone(start, stack, flags, new, &new->tid, new, &new->tid);
145 a_dec(&libc.threads_minus_1);