1 #include "pthread_impl.h"
2 #include "stdio_impl.h"
8 weak_alias(dummy_0, __acquire_ptc);
9 weak_alias(dummy_0, __release_ptc);
10 weak_alias(dummy_0, __pthread_tsd_run_dtors);
12 _Noreturn void pthread_exit(void *result)
14 pthread_t self = pthread_self();
17 self->result = result;
19 while (self->cancelbuf) {
20 void (*f)(void *) = self->cancelbuf->__f;
21 void *x = self->cancelbuf->__x;
22 self->cancelbuf = self->cancelbuf->__next;
26 __pthread_tsd_run_dtors();
28 __lock(self->exitlock);
30 /* Mark this thread dead before decrementing count */
31 __lock(self->killlock);
33 __unlock(self->killlock);
35 do n = libc.threads_minus_1;
36 while (n && a_cas(&libc.threads_minus_1, n, n-1)!=n);
39 if (self->detached && self->map_base) {
40 if (self->detached == 2)
41 __syscall(SYS_set_tid_address, 0);
42 __syscall(SYS_rt_sigprocmask, SIG_BLOCK,
43 SIGALL_SET, 0, __SYSCALL_SSLEN);
44 __unmapself(self->map_base, self->map_size);
47 for (;;) __syscall(SYS_exit, 0);
50 void __do_cleanup_push(struct __ptcb *cb)
52 struct pthread *self = pthread_self();
53 cb->__next = self->cancelbuf;
57 void __do_cleanup_pop(struct __ptcb *cb)
59 __pthread_self()->cancelbuf = cb->__next;
62 static int start(void *p)
65 if (self->unblock_cancel)
66 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
67 SIGPT_SET, 0, __SYSCALL_SSLEN);
68 pthread_exit(self->start(self->start_arg));
72 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
74 /* pthread_key_create.c overrides this */
75 static const size_t dummy = 0;
76 weak_alias(dummy, __pthread_tsd_size);
78 static FILE *const dummy_file = 0;
79 weak_alias(dummy_file, __stdin_used);
80 weak_alias(dummy_file, __stdout_used);
81 weak_alias(dummy_file, __stderr_used);
83 static void init_file_lock(FILE *f)
85 if (f && f->lock<0) f->lock = 0;
88 void *__copy_tls(unsigned char *);
90 int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attr, void *(*entry)(void *), void *restrict arg)
93 size_t size = DEFAULT_STACK_SIZE + DEFAULT_GUARD_SIZE;
94 size_t guard = DEFAULT_GUARD_SIZE;
95 struct pthread *self = pthread_self(), *new;
96 unsigned char *map, *stack, *tsd;
97 unsigned flags = 0x7d8f00;
99 if (!self) return ENOSYS;
100 if (!libc.threaded) {
101 for (FILE *f=libc.ofl_head; f; f=f->next)
103 init_file_lock(__stdin_used);
104 init_file_lock(__stdout_used);
105 init_file_lock(__stderr_used);
111 if (attr && attr->_a_stackaddr) {
113 tsd = (void *)(attr->_a_stackaddr-__pthread_tsd_size & -16);
116 guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
117 size = guard + ROUND(attr->_a_stacksize
118 + DEFAULT_STACK_SIZE + libc.tls_size);
120 size += __pthread_tsd_size;
122 map = mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANON, -1, 0);
123 if (map == MAP_FAILED) return EAGAIN;
124 if (mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)) {
129 map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
130 if (map == MAP_FAILED) return EAGAIN;
132 tsd = map + size - __pthread_tsd_size;
134 new = __copy_tls(stack = tsd - libc.tls_size);
136 new->map_size = size;
137 new->pid = self->pid;
138 new->errno_ptr = &new->errno_val;
140 new->start_arg = arg;
142 new->tsd = (void *)tsd;
143 if (attr && attr->_a_detach) {
147 new->unblock_cancel = self->cancel;
148 new->canary = self->canary;
150 a_inc(&libc.threads_minus_1);
151 ret = __clone(start, stack, flags, new, &new->tid, TP_ADJ(new), &new->tid);
156 a_dec(&libc.threads_minus_1);