cfd892fde9
no need to pass unnecessary extra arguments on to the core code in pthread_create.c. this just wastes cycles and code bloat.
140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
#include "pthread_impl.h"
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#include "stdio_impl.h"
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static void dummy_0()
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{
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}
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weak_alias(dummy_0, __synccall_lock);
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weak_alias(dummy_0, __synccall_unlock);
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weak_alias(dummy_0, __pthread_tsd_run_dtors);
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void pthread_exit(void *result)
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{
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pthread_t self = pthread_self();
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int n;
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self->result = result;
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while (self->cancelbuf) {
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void (*f)(void *) = self->cancelbuf->__f;
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void *x = self->cancelbuf->__x;
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self->cancelbuf = self->cancelbuf->__next;
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f(x);
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}
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__pthread_tsd_run_dtors();
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__lock(&self->exitlock);
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/* Mark this thread dead before decrementing count */
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__lock(&self->killlock);
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self->dead = 1;
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a_store(&self->killlock, 0);
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do n = libc.threads_minus_1;
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while (n && a_cas(&libc.threads_minus_1, n, n-1)!=n);
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if (!n) exit(0);
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if (self->detached && self->map_base) {
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__syscall(SYS_rt_sigprocmask, SIG_BLOCK, (uint64_t[]){-1},0,8);
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__unmapself(self->map_base, self->map_size);
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}
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__syscall(SYS_exit, 0);
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}
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void __do_cleanup_push(struct __ptcb *cb)
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{
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struct pthread *self = pthread_self();
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cb->__next = self->cancelbuf;
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self->cancelbuf = cb;
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}
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void __do_cleanup_pop(struct __ptcb *cb)
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{
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__pthread_self()->cancelbuf = cb->__next;
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}
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static int start(void *p)
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{
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pthread_t self = p;
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if (self->unblock_cancel)
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__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
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pthread_exit(self->start(self->start_arg));
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return 0;
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}
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#define ROUND(x) (((x)+PAGE_SIZE-1)&-PAGE_SIZE)
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/* pthread_key_create.c overrides this */
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static const size_t dummy = 0;
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weak_alias(dummy, __pthread_tsd_size);
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static FILE *const dummy_file = 0;
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weak_alias(dummy_file, __stdin_used);
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weak_alias(dummy_file, __stdout_used);
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weak_alias(dummy_file, __stderr_used);
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static void init_file_lock(FILE *f)
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{
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if (f && f->lock<0) f->lock = 0;
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}
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int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(void *), void *arg)
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{
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int ret;
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size_t size = DEFAULT_STACK_SIZE + DEFAULT_GUARD_SIZE;
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size_t guard = DEFAULT_GUARD_SIZE;
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struct pthread *self = pthread_self(), *new;
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unsigned char *map, *stack, *tsd;
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if (!self) return ENOSYS;
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if (!libc.threaded) {
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for (FILE *f=libc.ofl_head; f; f=f->next)
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init_file_lock(f);
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init_file_lock(__stdin_used);
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init_file_lock(__stdout_used);
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init_file_lock(__stderr_used);
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__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
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libc.threaded = 1;
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}
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if (attr) {
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guard = ROUND(attr->_a_guardsize + DEFAULT_GUARD_SIZE);
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size = guard + ROUND(attr->_a_stacksize + DEFAULT_STACK_SIZE);
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}
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size += __pthread_tsd_size;
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map = mmap(0, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
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if (map == MAP_FAILED) return EAGAIN;
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if (guard) mprotect(map, guard, PROT_NONE);
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tsd = map + size - __pthread_tsd_size;
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new = (void *)(tsd - sizeof *new - PAGE_SIZE%sizeof *new);
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new->map_base = map;
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new->map_size = size;
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new->pid = self->pid;
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new->errno_ptr = &new->errno_val;
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new->start = entry;
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new->start_arg = arg;
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new->self = new;
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new->tsd = (void *)tsd;
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if (attr) new->detached = attr->_a_detach;
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new->unblock_cancel = self->cancel;
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new->canary = self->canary ^ (uintptr_t)&new;
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stack = (void *)new;
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__synccall_lock();
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a_inc(&libc.threads_minus_1);
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ret = __clone(start, stack, 0x7d8f00, new, &new->tid, new, &new->tid);
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__synccall_unlock();
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if (ret < 0) {
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a_dec(&libc.threads_minus_1);
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munmap(map, size);
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return EAGAIN;
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}
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*res = new;
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return 0;
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}
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