10-23-2009
is the key of the 890 in the "locked" position?
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LEARN ABOUT SUNOS
_lwp_mutex_unlock
_lwp_mutex_lock(2) System Calls _lwp_mutex_lock(2)
NAME
_lwp_mutex_lock, _lwp_mutex_unlock, _lwp_mutex_trylock - mutual exclusion
SYNOPSIS
#include <sys/lwp.h>
int _lwp_mutex_lock(lwp_mutex_t *mp);
int _lwp_mutex_trylock(lwp_mutex_t *mp);
int _lwp_mutex_unlock(lwp_mutex_t *mp);
DESCRIPTION
These functions serialize the execution of lightweight processes. They are useful for ensuring that only one lightweight process can exe-
cute a critical section of code at any one time (mutual exclusion). LWP mutexes must be initialized to 0 before use.
The _lwp_mutex_lock() function locks the LWP mutex pointed to by mp. If the mutex is already locked, the calling LWP blocks until the mutex
becomes available. When _lwp_mutex_lock() returns, the mutex is locked and the calling LWP is the "owner".
The _lwp_mutex_trylock() function attempts to lock the mutex. If the mutex is already locked it returns with an error. If the mutex is
unlocked, it is locked and _lwp_mutex_trylock() returns.
The _lwp_mutex_unlock() function unlocks a locked mutex. The mutex must be locked and the calling LWP must be the one that last locked the
mutex (the owner). If any other LWPs are waiting for the mutex to become available, one of them is unblocked.
RETURN VALUES
Upon successful completion, 0 is returned. A non-zero value indicates an error.
ERRORS
If any of the following conditions are detected, _lwp_mutex_lock(), _lwp_mutex_trylock(), and _lwp_mutex_unlock() fail and return the cor-
responding value:
EINVAL The mp argument points to an invalid LWP mutex.
EFAULT The mp argument points to an illegal address.
If any of the following conditions occur, _lwp_mutex_trylock() fails and returns the corresponding value:
EBUSY The mp argument points to a locked mutex.
SEE ALSO
intro(2), _lwp_cond_wait(2)
SunOS 5.10 30 Jul 1992 _lwp_mutex_lock(2)