magenta/syscall/futex.c

#include <kernel/futex.h>
#include <kernel/sched.h>
#include <kernel/syscall.h>
#include <kernel/task.h>

kern_status_t sys_futex_wait(
	kern_futex_t *futex,
	kern_futex_t new_val,
	unsigned int flags)
{
	struct task *self = get_current_task();
	if (!validate_access_r(self, futex, sizeof *futex)) {
		put_current_task(self);
		return KERN_MEMORY_FAULT;
	}

	futex_key_t key;
	kern_status_t status = futex_get(futex, &key, flags);
	if (status != KERN_OK) {
		put_current_task(self);
		return status;
	}

	status = futex_wait(key, new_val, flags);
	put_current_task(self);
	return status;
}

kern_status_t sys_futex_wake(
	kern_futex_t *futex,
	unsigned int nr_waiters,
	unsigned int flags)
{
	futex_key_t key;
	kern_status_t status = futex_get(futex, &key, flags);
	if (status != KERN_OK) {
		return status;
	}

	return futex_wake(key, nr_waiters, flags);
}