1 #include "pthread_impl.h"
6 weak_alias(dummy_0, __rsyscall_lock);
7 weak_alias(dummy_0, __rsyscall_unlock);
8 weak_alias(dummy_0, __pthread_tsd_run_dtors);
10 #ifdef __pthread_unwind_next
11 #undef __pthread_unwind_next
12 #define __pthread_unwind_next __pthread_unwind_next_3
15 void __pthread_unwind_next(struct __ptcb *cb)
17 pthread_t self = pthread_self();
21 self->cancelbuf = cb->__next->__next;
22 longjmp((void *)cb->__next->__jb, 1);
25 LOCK(&self->exitlock);
27 __pthread_tsd_run_dtors();
29 /* Mark this thread dead before decrementing count */
32 do n = libc.threads_minus_1;
33 while (n && a_cas(&libc.threads_minus_1, n, n-1)!=n);
36 if (self->detached && self->map_base) {
37 __syscall(SYS_rt_sigprocmask, SIG_BLOCK, (long)(uint64_t[1]){-1},0,8);
38 __unmapself(self->map_base, self->map_size);
41 __syscall(SYS_exit, 0);
44 static int start(void *p)
46 struct pthread *self = p;
47 if (self->unblock_cancel) {
50 sigaddset(&set, SIGCANCEL);
51 __libc_sigprocmask(SIG_UNBLOCK, &set, 0);
53 pthread_exit(self->start(self->start_arg));
57 int __uniclone(void *, int (*)(), void *);
59 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
61 /* pthread_key_create.c overrides this */
62 static const size_t dummy = 0;
63 weak_alias(dummy, __pthread_tsd_size);
65 int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
69 struct pthread *self = pthread_self(), *new;
70 unsigned char *map, *stack, *tsd;
71 const pthread_attr_t default_attr = { 0 };
73 if (!self) return ENOSYS;
77 sigaddset(&set, SIGSYSCALL);
78 sigaddset(&set, SIGCANCEL);
79 __libc_sigprocmask(SIG_UNBLOCK, &set, 0);
83 if (!attr) attr = &default_attr;
84 guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
85 size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
86 size += __pthread_tsd_size;
87 map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0);
88 if (!map) return EAGAIN;
89 if (guard) mprotect(map, guard, PROT_NONE);
91 tsd = map + size - __pthread_tsd_size;
92 new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
96 new->errno_ptr = &new->errno_val;
100 new->tsd = (void *)tsd;
101 new->detached = attr->_a_detach;
103 new->unblock_cancel = self->cancel;
104 memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc);
105 new->tlsdesc[1] = (uintptr_t)new;
106 stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15);
110 a_inc(&libc.threads_minus_1);
111 ret = __uniclone(stack, start, new);
116 a_dec(&libc.threads_minus_1);
124 void pthread_exit(void *result)
126 struct pthread *self = pthread_self();
127 struct __ptcb cb = { .__next = self->cancelbuf };
128 self->result = result;
129 __pthread_unwind_next(&cb);