1 #include "pthread_impl.h"
6 weak_alias(dummy_0, __rsyscall_lock);
7 weak_alias(dummy_0, __rsyscall_unlock);
9 static void dummy_1(pthread_t self)
12 weak_alias(dummy_1, __pthread_tsd_run_dtors);
13 weak_alias(dummy_1, __sigtimer_handler);
15 #ifdef __pthread_unwind_next
16 #undef __pthread_unwind_next
17 #define __pthread_unwind_next __pthread_unwind_next_3
20 void __pthread_unwind_next(struct __ptcb *cb)
24 if (cb->__next) longjmp((void *)cb->__next->__jb, 1);
26 self = pthread_self();
28 LOCK(&self->exitlock);
30 __pthread_tsd_run_dtors(self);
32 /* Mark this thread dead before decrementing count */
35 if (!a_fetch_add(&libc.threads_minus_1, -1))
38 if (self->detached && self->map_base) {
39 __syscall(SYS_rt_sigprocmask, SIG_BLOCK, (long)(uint64_t[1]){-1},0,8);
40 __unmapself(self->map_base, self->map_size);
43 __syscall(SYS_exit, 0);
46 static void docancel(struct pthread *self)
48 struct __ptcb cb = { .__next = self->cancelbuf };
49 self->canceldisable = 1;
50 self->cancelasync = 0;
51 __pthread_unwind_next(&cb);
54 static void cancel_handler(int sig, siginfo_t *si, void *ctx)
56 struct pthread *self = __pthread_self();
57 if (si->si_code == SI_TIMER) __sigtimer_handler(self);
58 if (self->cancel && !self->canceldisable &&
59 (self->cancelasync || (self->cancelpoint==1 && PC_AT_SYS(ctx))))
63 static void cancelpt(int x)
65 struct pthread *self = __pthread_self();
66 if ((self->cancelpoint+=x)==1 && self->cancel
67 && x<2U && !self->canceldisable) docancel(self);
70 static void init_threads()
72 struct sigaction sa = { .sa_flags = SA_SIGINFO | SA_RESTART };
74 libc.lockfile = __lockfile;
75 libc.cancelpt = cancelpt;
77 sigemptyset(&sa.sa_mask);
78 sa.sa_sigaction = cancel_handler;
79 __libc_sigaction(SIGCANCEL, &sa, 0);
81 sigaddset(&sa.sa_mask, SIGSYSCALL);
82 sigaddset(&sa.sa_mask, SIGCANCEL);
83 __libc_sigprocmask(SIG_UNBLOCK, &sa.sa_mask, 0);
86 static int start(void *p)
88 struct pthread *self = p;
89 if (self->unblock_cancel) {
92 sigaddset(&set, SIGCANCEL);
93 __libc_sigprocmask(SIG_UNBLOCK, &set, 0);
95 pthread_exit(self->start(self->start_arg));
99 int __uniclone(void *, int (*)(), void *);
101 #define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
103 /* pthread_key_create.c overrides this */
104 static const size_t dummy = 0;
105 weak_alias(dummy, __pthread_tsd_size);
107 int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
112 struct pthread *self = pthread_self(), *new;
113 unsigned char *map, *stack, *tsd;
114 const pthread_attr_t default_attr = { 0 };
116 if (!self) return ENOSYS;
117 if (!init && ++init) init_threads();
119 if (!attr) attr = &default_attr;
120 guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
121 size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
122 size += __pthread_tsd_size;
123 map = mmap(0, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANON, -1, 0);
124 if (!map) return EAGAIN;
125 if (guard) mprotect(map, guard, PROT_NONE);
127 tsd = map + size - __pthread_tsd_size;
128 new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
130 new->map_size = size;
131 new->pid = self->pid;
132 new->errno_ptr = &new->errno_val;
134 new->start_arg = arg;
136 new->tsd = (void *)tsd;
137 new->detached = attr->_a_detach;
139 new->unblock_cancel = self->cancel;
140 new->result = PTHREAD_CANCELED;
141 memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc);
142 new->tlsdesc[1] = (uintptr_t)new;
143 stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15);
147 a_inc(&libc.threads_minus_1);
148 ret = __uniclone(stack, start, new);
153 a_dec(&libc.threads_minus_1);
161 void pthread_exit(void *result)
163 struct pthread *self = pthread_self();
164 self->result = result;