#define _GNU_SOURCE
#include "pthread_impl.h"
#include "stdio_impl.h"
#include "libc.h"
#include <sys/mman.h>
#include <threads.h>

static void dummy_0()
{
}
weak_alias(dummy_0, __pthread_tsd_run_dtors);
weak_alias(dummy_0, __tss_run_dtors);

_Noreturn void __pthread_exit(void *result)
{
	pthread_t self = __pthread_self();
	sigset_t set;

	self->result = result;

	while (self->cancelbuf) {
		void (*f)(void *) = self->cancelbuf->__f;
		void *x = self->cancelbuf->__x;
		self->cancelbuf = self->cancelbuf->__next;
		f(x);
	}

	__pthread_tsd_run_dtors();

	__tss_run_dtors();

	__lock(self->exitlock);

	/* Mark this thread dead before decrementing count */
	__lock(self->killlock);
	self->dead = 1;

	/* Block all signals before decrementing the live thread count.
	 * This is important to ensure that dynamically allocated TLS
	 * is not under-allocated/over-committed, and possibly for other
	 * reasons as well. */
	__block_all_sigs(&set);

	/* Wait to unlock the kill lock, which governs functions like
	 * pthread_kill which target a thread id, until signals have
	 * been blocked. This precludes observation of the thread id
	 * as a live thread (with application code running in it) after
	 * the thread was reported dead by ESRCH being returned. */
	__unlock(self->killlock);

	/* It's impossible to determine whether this is "the last thread"
	 * until performing the atomic decrement, since multiple threads
	 * could exit at the same time. For the last thread, revert the
	 * decrement and unblock signals to give the atexit handlers and
	 * stdio cleanup code a consistent state. */
	if (a_fetch_add(&libc.threads_minus_1, -1)==0) {
		libc.threads_minus_1 = 0;
		__restore_sigs(&set);
		exit(0);
	}

	if (self->locale != &libc.global_locale) {
		a_dec(&libc.uselocale_cnt);
		if (self->locale->ctype_utf8)
			a_dec(&libc.bytelocale_cnt_minus_1);
	}

	if (self->detached && self->map_base) {
		/* Detached threads must avoid the kernel clear_child_tid
		 * feature, since the virtual address will have been
		 * unmapped and possibly already reused by a new mapping
		 * at the time the kernel would perform the write. In
		 * the case of threads that started out detached, the
		 * initial clone flags are correct, but if the thread was
		 * detached later (== 2), we need to clear it here. */
		if (self->detached == 2) __syscall(SYS_set_tid_address, 0);

		/* The following call unmaps the thread's stack mapping
		 * and then exits without touching the stack. */
		__unmapself(self->map_base, self->map_size);
	}

	for (;;) __syscall(SYS_exit, 0);
}
weak_alias(__pthread_exit, pthread_exit);

void __do_cleanup_push(struct __ptcb *cb)
{
	if (!libc.has_thread_pointer) return;
	struct pthread *self = __pthread_self();
	cb->__next = self->cancelbuf;
	self->cancelbuf = cb;
}

void __do_cleanup_pop(struct __ptcb *cb)
{
	if (!libc.has_thread_pointer) return;
	__pthread_self()->cancelbuf = cb->__next;
}

/* pthread_key_create.c overrides this */
static volatile size_t dummy = 0;
weak_alias(dummy, __pthread_tsd_size);
static void *dummy_tsd[1] = { 0 };
weak_alias(dummy_tsd, __pthread_tsd_main);

static FILE *volatile dummy_file = 0;
weak_alias(dummy_file, __stdin_used);
weak_alias(dummy_file, __stdout_used);
weak_alias(dummy_file, __stderr_used);

static void init_file_lock(FILE *f)
{
	if (f && f->lock<0) f->lock = 0;
}

void __thread_enable(void)
{
	for (FILE *f=libc.ofl_head; f; f=f->next)
		init_file_lock(f);
	init_file_lock(__stdin_used);
	init_file_lock(__stdout_used);
	init_file_lock(__stderr_used);
	__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, _NSIG/8);
	__pthread_self()->tsd = (void **)__pthread_tsd_main;
	libc.threaded = 1;
}