C++ (Cpp) ldsem_up_read Examples

Example #1

File: tty_ldisc.c Project: AeroGirl/VAR-SOM-AM33-SDK7-Kernel

struct tty_ldisc *tty_ldisc_ref(struct tty_struct *tty)
{
	struct tty_ldisc *ld = NULL;

	if (ldsem_down_read_trylock(&tty->ldisc_sem)) {
		ld = tty->ldisc;
		if (!ld)
			ldsem_up_read(&tty->ldisc_sem);
	}
	return ld;
}

Example #2

File: tty_ldisc.c Project: P-D-A/android_kernel_lge_mt6753

struct tty_ldisc *tty_ldisc_ref(struct tty_struct *tty)
{
	struct tty_ldisc *ld = NULL;

	/*in case there is no ldisc_sem init or it's free already*/
	WARN_ON(!(&tty->ldisc_sem));

	if (ldsem_down_read_trylock(&tty->ldisc_sem)) {
		ld = tty->ldisc;
		if (!ld)
			ldsem_up_read(&tty->ldisc_sem);
	}
	return ld;
}

Example #3

File: tty_ldisc.c Project: AeroGirl/VAR-SOM-AM33-SDK7-Kernel

void tty_ldisc_deref(struct tty_ldisc *ld)
{
	ldsem_up_read(&ld->tty->ldisc_sem);
}