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->startlock[0]) {
66 __wait(self->startlock, 0, 1, 1);
67 if (self->startlock[0]) {
71 __syscall(SYS_rt_sigprocmask, SIG_SETMASK,
72 self->sigmask, 0, __SYSCALL_SSLEN);
74 if (self->unblock_cancel)
75 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
76 SIGPT_SET, 0, __SYSCALL_SSLEN);
77 pthread_exit(self->start(self->start_arg));
81 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
83 /* pthread_key_create.c overrides this */
84 static const size_t dummy = 0;
85 weak_alias(dummy, __pthread_tsd_size);
87 static FILE *const dummy_file = 0;
88 weak_alias(dummy_file, __stdin_used);
89 weak_alias(dummy_file, __stdout_used);
90 weak_alias(dummy_file, __stderr_used);
92 static void init_file_lock(FILE *f)
94 if (f && f->lock<0) f->lock = 0;
97 void *__copy_tls(unsigned char *);
99 int pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict attrp, void *(*entry)(void *), void *restrict arg)
103 struct pthread *self = pthread_self(), *new;
104 unsigned char *map = 0, *stack = 0, *tsd = 0;
105 unsigned flags = 0x7d8f00;
107 pthread_attr_t attr = {0};
109 if (!self) return ENOSYS;
110 if (!libc.threaded) {
111 for (FILE *f=libc.ofl_head; f; f=f->next)
113 init_file_lock(__stdin_used);
114 init_file_lock(__stdout_used);
115 init_file_lock(__stderr_used);
118 if (attrp) attr = *attrp;
122 if (attr._a_stackaddr) {
123 size_t need = libc.tls_size + __pthread_tsd_size;
124 size = attr._a_stacksize + DEFAULT_STACK_SIZE;
125 stack = (void *)(attr._a_stackaddr & -16);
126 /* Use application-provided stack for TLS only when
127 * it does not take more than ~12% or 2k of the
128 * application's stack space. */
129 if (need < size/8 && need < 2048) {
130 tsd = stack - __pthread_tsd_size;
131 stack = tsd - libc.tls_size;
137 guard = ROUND(DEFAULT_GUARD_SIZE + attr._a_guardsize);
138 size = guard + ROUND(DEFAULT_STACK_SIZE + attr._a_stacksize
139 + libc.tls_size + __pthread_tsd_size);
144 map = mmap(0, size, PROT_NONE, MAP_PRIVATE|MAP_ANON, -1, 0);
145 if (map == MAP_FAILED) goto fail;
146 if (mprotect(map+guard, size-guard, PROT_READ|PROT_WRITE)) {
151 map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
152 if (map == MAP_FAILED) goto fail;
154 tsd = map + size - __pthread_tsd_size;
155 if (!stack) stack = tsd - libc.tls_size;
158 new = __copy_tls(tsd - libc.tls_size);
160 new->map_size = size;
161 new->pid = self->pid;
162 new->errno_ptr = &new->errno_val;
164 new->start_arg = arg;
166 new->tsd = (void *)tsd;
167 if (attr._a_detach) {
172 do_sched = new->startlock[0] = 1;
173 __syscall(SYS_rt_sigprocmask, SIG_BLOCK,
174 SIGALL_SET, self->sigmask, __SYSCALL_SSLEN);
176 new->unblock_cancel = self->cancel;
177 new->canary = self->canary;
179 a_inc(&libc.threads_minus_1);
180 ret = __clone(start, stack, flags, new, &new->tid, TP_ADJ(new), &new->tid);
185 __syscall(SYS_rt_sigprocmask, SIG_SETMASK,
186 new->sigmask, 0, __SYSCALL_SSLEN);
190 a_dec(&libc.threads_minus_1);
191 if (map) munmap(map, size);
196 ret = __syscall(SYS_sched_setscheduler, new->tid,
197 attr._a_policy, &attr._a_prio);
198 a_store(new->startlock, ret<0 ? 2 : 0);
199 __wake(new->startlock, 1, 1);
200 if (ret < 0) return -ret;