console_trylock(9) [centos man page]

CONSOLE_TRYLOCK(9)						   Driver Basics						CONSOLE_TRYLOCK(9)

NAME

       console_trylock - try to lock the console system for exclusive use.

SYNOPSIS

       int console_trylock(void);

ARGUMENTS

       void
	   no arguments

DESCRIPTION

       Tried to acquire a lock which guarantees that the caller has exclusive access to the console system and the console_drivers list.

       returns 1 on success, and 0 on failure to acquire the lock.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							CONSOLE_TRYLOCK(9)

tis_write_trylock(3)					     Library Functions Manual					      tis_write_trylock(3)

NAME

       tis_write_trylock - Attempts to acquire the specified read-write lock for write access.

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <tis.h>

       int   tis_write_trylock(
			      tis_rwlock_t   *lock);

STANDARDS

       None

PARAMETERS

       Address of the read-write lock to be acquired for write access.

DESCRIPTION

       This routine attempts to acquire a read-write lock for write access.  The routine attempts to immediately acquire the lock.  If the lock is
       acquired, zero (0) is returned.	If the lock is held by another thread (for either read or write access), [EBUSY] is returned and the call-
       ing thread does not wait for the write-access lock to be acquired.

       Note that it is a coding error to attempt to acquire the lock for write access if the lock is already held by the calling thread. (However,
       this routine returns [EBUSY] anyway, because no ownership error-checking takes place.)

RETURN VALUES

       If an error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are  as  follows:
       Successful completion; the lock is acquired for write access.  The lock was not acquired for write access, as it is already held by another
       thread.

ERRORS

       None

RELATED INFORMATION

       Functions:  tis_read_lock(3),  tis_read_trylock(3),  tis_read_unlock(3),  tis_rwlock_destroy(3),   tis_rwlock_init(3),	tis_write_lock(3),
       tis_write_unlock(3)

       Manuals: Guide to DECthreads and Programmer's Guide delim off

															      tis_write_trylock(3)