_LWP_UNPARK(2)

_LWP_UNPARK(2) | System Calls Manual | _LWP_UNPARK(2)

# NAME

`_lwp_unpark` —
resume execution of a waiting LWP

# LIBRARY

Standard C Library (libc, -lc)

# SYNOPSIS

`#include <lwp.h>`

int
`_lwp_unpark`(lwpid_t lwp, const void *hint);

# DESCRIPTION

`_lwp_unpark`() resumes execution of the light-weight process lwp.

The target LWP is assumed to be waiting in the kernel as a result of a call to `_lwp_park`(). If the target LWP is not currently waiting, it will return immediately upon the next call to `_lwp_park`().

See _lwp_park(2) for a description of the hint argument.

# RETURN VALUES

A 0 value indicates that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicate the reason.

# ERRORS

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

# SEE ALSO

_lwp_park(2), _lwp_unpark_all(2), _lwp_wakeup(2)

# HISTORY

The `_lwp_unpark`() system call first appeared in NetBSD 5.0.

January 20, 2007 | NetBSD 9.5