_lwp_unpark_all(2) - NetBSD Manual Pages

_LWP_UNPARK_ALL(2)        NetBSD System Calls Manual        _LWP_UNPARK_ALL(2)


NAME

     _lwp_unpark_all -- resume execution of a waiting LWP


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <lwp.h>

     ssize_t
     _lwp_unpark_all(const lwpid_t *targets, size_t ntargets,
         const void *hint);


DESCRIPTION

     _lwp_unpark_all() resumes execution of one or more light-weight processes
     listed in the array pointed to by targets.

     The target LWPs are assumed to be waiting in the kernel as a result of
     calls to _lwp_park().  If any of the target LWPs are not currently wait-
     ing, those LWPs will return immediately upon the next call to
     _lwp_park().

     The ntargets argument specifies the size of the array pointed to by
     targets.

     If the targets argument is given as NULL, the maximum size of the array
     (expressed as the number of entries) is returned.

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


RETURN VALUES

     If the maximum size of the targets array is not being queried, the
     _lwp_unpark_all() function returns the value 0 if successful; otherwise
     the value -1 is returned and the global variable errno is set to indicate
     the error.


ERRORS

     [EFAULT]           The value specified for targets is invalid.

     [EINVAL]           The value specified for ntargets is out of range.

     [ENOMEM]           Insufficient resources are available to complete the
                        operation.


SEE ALSO

     _lwp_park(2), _lwp_unpark(2), _lwp_wakeup(2)


HISTORY

     The _lwp_unpark_all() system call first appeared in NetBSD 5.0.

NetBSD 10.99                   February 10, 2007                  NetBSD 10.99