January 13, 2003 _LWP_WAKEUP 2

### NAME

_lwp_wakeup - make a blocked light-weight process runnable

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```int` _lwp_wakeup(```lwpid_t lwp`)

### DESCRIPTION

_lwp_wakeup(``) makes a blocked LWP runnable. The blocked LWP must be in ```LSSLEEP` state. Unblocking the LWP does not guarantee that it will make progress; it may block again as soon as it resumes execution in the kernel.

### RETURN VALUES

Upon successful completion, _lwp_wakeup(``) returns a value of 0. Otherwise, an error code is returned to indicate the error.

### ERRORS

_lwp_wakeup(``) will fail if:

[```ESRCH`]
  No LWP can be found in the current process corresponding to that specified by ```lwp`.

[```ENODEV`]
  The specified LWP is not in ```LSSLEEP` state.

[```EBUSY`]
  The specified LWP is blocked in an uninterruptible sleep.

### HISTORY

The _lwp_wakeup(``) system call first appeared in NetBSD2.0.