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path: root/src/thread/pthread_self.c
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#include "pthread_impl.h"

static struct pthread main_thread;

#undef errno
static int *errno_location()
{
	return pthread_self()->errno_ptr;
}

static int init_main_thread()
{
	main_thread.tlsdesc[0] = -1;
	main_thread.tlsdesc[1] = (long)&main_thread;
	main_thread.tlsdesc[2] = SIZE_MAX/PAGE_SIZE;
	main_thread.tlsdesc[3] = 0x51;
	main_thread.self = &main_thread;
	main_thread.errno_ptr = __errno_location();
	if (__set_thread_area(main_thread.tlsdesc) < 0)
		return -1;
	syscall1(__NR_set_tid_address, (long)&main_thread.tid);
	libc.errno_location = errno_location;
	main_thread.tid = main_thread.pid = getpid();
	return 0;
}

#undef pthread_self

pthread_t pthread_self()
{
	static int init, failed;
	if (!init) {
		if (failed) return 0;
		if (init_main_thread() < 0) failed = 1;
		if (failed) return 0;
		init = 1;
	}
	return __pthread_self();
}