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lock(9s) [osf1 man page]

lock(9s)																  lock(9s)

NAME
lock - General: Contains complex lock-specific information SYNOPSIS
The lock data structure is an opaque data structure; that is, its associated members are referenced and manipulated by the operating system and not by the user of the complex lock mechanism. Therefore, this reference page omits a description of the lock data structure's associ- ated members. DESCRIPTION
The lock data structure is the complex lock structure that contains complex lock-specific information. A kernel module writer using the complex lock method declares a pointer to a lock data structure and passes its address to the associated lock routines. NOTES
The header file <lock.h> shows typedef statements that assign the alternate name lock_data_t for the complex lock structure and lock_t for a pointer to the complex lock structure. FILES
SEE ALSO
Routines: lock_done(9r), lock_init(9r), lock_read(9r), lock_terminate(9r), lock_try_read(9r), lock_try_write(9r), lock_write(9r) Data Structures: slock(9s) lock(9s)

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lock_write(9r)															    lock_write(9r)

NAME
lock_write - Asserts a complex lock with write access SYNOPSIS
#include <kern/lock.h> void lock_write( lock_t lock_structptr ); ARGUMENTS
Specifies a pointer to the complex lock structure, lock. This is the lock structure associated with the resource on which you want to assert a complex lock with write access. The lock structure is an opaque data structure; that is, its associated members are referenced and manipulated by the operating system and not by the user of the complex lock mechanism. DESCRIPTION
The lock_write routine asserts a lock with exclusive write access for the resource associated with the specified lock structure pointer. This means that once a write lock is asserted, no other kernel thread can gain read or write access to the resource until it is released. To release a complex write lock successfully asserted by lock_write, call the lock_done routine. NOTES
You must call lock_init (once only) prior to calling lock_write to initialize the lock structure pointer for the resource. A resource, from the kernel module's standpoint, is data that more than one kernel thread can manipulate. You can store the resource in global vari- ables and in data structure members. RETURN VALUES
None FILES
SEE ALSO
Routines: lock_done(9r), lock_read(9r), lock_terminate(9r), lock_try_read(9r), lock_try_write(9r) Data Structures: lock(9s) lock_write(9r)
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