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<?xml version="1.0"?>
<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 1.0.4//EN" "http://www.gnustep.org/gsdoc-1_0_4.dtd">
<gsdoc base="NSLock" up="Base">
<head>
<title>NSLock class reference</title>
<author name="David Chisnall">
<email address="csdavec@swan.ac.uk">
csdavec@swan.ac.uk
</email>
</author>
<copy>1996-2010 Free Software Foundation, Inc.</copy>
</head>
<body>
<front><contents /></front>
<chapter>
<heading>
Software documentation for the NSCondition class
</heading>
<class name="NSCondition" super="NSObject" ovadd="1.0.0">
<declared>Foundation/NSLock.h</declared>
<conform>NSLocking</conform>
<desc>
NSCondition provides an interface to POSIX
condition variables.
</desc>
<ivariable type="gs_cond_t" name="_condition" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="gs_mutex_t" name="_mutex" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="NSString*" name="_name" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<method type="void" ovadd="1.0.0">
<sel>broadcast</sel>
<desc>
Wakes all threads that are waiting on this condition.
</desc>
</method>
<method type="NSString*" ovadd="1.0.0">
<sel>name</sel>
<desc>
Returns the name used for debugging messages.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>setName:</sel>
<arg type="NSString*">newName</arg>
<desc>
Sets the name used for debugging messages.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>signal</sel>
<desc>
Wakes wany one of the threads that are waiting on
this condition.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>wait</sel>
<desc>
Blocks and atomically unlocks the receiver. This
method should only be called when the receiver is
locked. The caller will then block until the
receiver is sent either a
<ref type="method" id="-signal">
-signal
</ref>
or <ref type="method" id="-broadcast">-broadcast</ref>
message from another thread. At which point, the
calling thread will reacquire the lock.
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>waitUntilDate:</sel>
<arg type="NSDate*">limit</arg>
<desc>
Blocks the calling thread and acquires the lock, in
the same way as
<ref type="method" id="-wait">
-wait
</ref>
. Returns <code>YES</code> if the condition is signaled,
or <code>NO</code> if the timeout is reached.
</desc>
</method>
</class>
</chapter>
<chapter>
<heading>
Software documentation for the NSConditionLock class
</heading>
<class name="NSConditionLock" super="NSObject" ovadd="1.0.0">
<declared>Foundation/NSLock.h</declared>
<conform>NSLocking</conform>
<desc>
Lock that allows user to request it only when an
internal integer condition is equal to a particular
value. The condition is set on initialization and
whenever the lock is relinquished.
</desc>
<ivariable type="NSCondition*" name="_condition" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="int" name="_condition_value" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="NSString*" name="_name" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<method type="NSInteger" ovadd="1.0.0">
<sel>condition</sel>
<desc>
Return the current condition of the lock.
</desc>
</method>
<method type="id" ovadd="1.0.0">
<sel>initWithCondition:</sel>
<arg type="NSInteger">value</arg>
<desc>
Initialize lock with given condition.
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>isLockedByCurrentThread</sel>
<desc>
Report whether this lock is held by the current
thread. <br /> Raises an exception if this is not
supported by the system lock mechanism.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>lock</sel>
<desc>
Block until acquiring lock.
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>lockBeforeDate:</sel>
<arg type="NSDate*">limit</arg>
<desc>
Try to acquire lock and return before <var>limit</var>,
<code>YES</code> if succeeded, <code>NO</code> if
not.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>lockWhenCondition:</sel>
<arg type="NSInteger">value</arg>
<desc>
Acquire lock when it is available and the internal
condition is equal to <var>value</var>. Blocks
until this occurs.
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>lockWhenCondition:</sel>
<arg type="NSInteger">condition_to_meet</arg>
<sel>beforeDate:</sel>
<arg type="NSDate*">limitDate</arg>
<desc>
Try to acquire lock, when internal condition is equal
to <var>condition_to_meet</var>, and return before
limit, <code>YES</code> if succeeded,
<code>NO</code> if not.
</desc>
</method>
<method type="NSString*" ovadd="10.5.0">
<sel>name</sel>
<desc>
Return the name of the receiver or <code>nil</code>
of none has been set.
</desc>
</method>
<method type="void" ovadd="10.5.0">
<sel>setName:</sel>
<arg type="NSString*">name</arg>
<desc>
Sets the <var>name</var> of the receiver (for use in
debugging).
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>tryLock</sel>
<desc>
Try to acquire lock regardless of condition and return
immediately, <code>YES</code> if succeeded,
<code>NO</code> if not.
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>tryLockWhenCondition:</sel>
<arg type="NSInteger">value</arg>
<desc>
Try to acquire lock if condition is equal to
<var>value</var> and return immediately in any case,
<code>YES</code> if succeeded, <code>NO</code> if
not.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>unlock</sel>
<desc>
Relinquish lock.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>unlockWithCondition:</sel>
<arg type="NSInteger">value</arg>
<desc>
Relinquish the lock, setting internal condition
to <var>value</var>.
</desc>
</method>
</class>
</chapter>
<chapter>
<heading>
Software documentation for the NSLock class
</heading>
<class name="NSLock" super="NSObject" ovadd="1.0.0">
<declared>Foundation/NSLock.h</declared>
<conform>NSLocking</conform>
<desc>
<p>
Simplest lock for protecting critical sections of
code.
</p>
<p>
An <code>NSLock</code> is used in multi-threaded
applications to protect critical pieces of
code. While one thread holds a lock within a piece of
code, another thread cannot execute that code until
the first thread has given up its hold on the lock. The
limitation of <code>NSLock</code> is that you
can only lock an <code>NSLock</code> once and it must
be unlocked before it can be acquired again. <br />
Other lock classes, notably
<ref type="class" id="NSRecursiveLock">NSRecursiveLock</ref>, have different restrictions.</p>
</desc>
<ivariable type="gs_mutex_t" name="_mutex" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="NSString*" name="_name" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<method type="BOOL" ovadd="1.0.0">
<sel>isLockedByCurrentThread</sel>
<desc>
Report whether this lock is held by the current
thread. <br /> Raises an exception if this is not
supported by the system lock mechanism.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>lock</sel>
<desc>
Block until acquiring lock.
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>lockBeforeDate:</sel>
<arg type="NSDate*">limit</arg>
<desc>
Try to acquire lock and return before <var>limit</var>,
<code>YES</code> if succeeded, <code>NO</code> if
not.
</desc>
</method>
<method type="NSString*" ovadd="10.5.0">
<sel>name</sel>
<desc>
Return the name of the receiver or <code>nil</code>
of none has been set.
</desc>
</method>
<method type="void" ovadd="10.5.0">
<sel>setName:</sel>
<arg type="NSString*">name</arg>
<desc>
Sets the <var>name</var> of the receiver (for use in
debugging).
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>tryLock</sel>
<desc>
Try to acquire lock and return immediately,
<code>YES</code> if succeeded, <code>NO</code> if
not.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>unlock</sel>
<desc>
Relinquish lock.
</desc>
</method>
</class>
</chapter>
<chapter>
<heading>
Software documentation for the NSRecursiveLock class
</heading>
<class name="NSRecursiveLock" super="NSObject" ovadd="1.0.0">
<declared>Foundation/NSLock.h</declared>
<conform>NSLocking</conform>
<desc>
Allows the lock to be recursively acquired by the same
thread. If the same thread locks the mutex (n) times
then that same thread must also unlock it (n) times
before another thread can acquire the lock.
</desc>
<ivariable type="gs_mutex_t" name="_mutex" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="NSString*" name="_name" validity="protected" ovadd="1.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<method type="BOOL" ovadd="1.0.0">
<sel>isLockedByCurrentThread</sel>
<desc>
Report whether this lock is held by the current
thread. <br /> Raises an exception if this is not
supported by the system lock mechanism.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>lock</sel>
<desc>
Block until acquiring lock.
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>lockBeforeDate:</sel>
<arg type="NSDate*">limit</arg>
<desc>
Try to acquire lock and return before <var>limit</var>,
<code>YES</code> if succeeded, <code>NO</code> if
not.
</desc>
</method>
<method type="NSString*" ovadd="10.5.0">
<sel>name</sel>
<desc>
Return the name of the receiver or <code>nil</code>
of none has been set.
</desc>
</method>
<method type="void" ovadd="10.5.0">
<sel>setName:</sel>
<arg type="NSString*">name</arg>
<desc>
Sets the <var>name</var> of the receiver (for use in
debugging).
</desc>
</method>
<method type="BOOL" ovadd="1.0.0">
<sel>tryLock</sel>
<desc>
Try to acquire lock regardless of condition and return
immediately, <code>YES</code> if succeeded,
<code>NO</code> if not.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>unlock</sel>
<desc>
Relinquish lock.
</desc>
</method>
</class>
</chapter>
<chapter>
<heading>
Software documentation for the NSObject(GSTraceLocks)
informal protocol
</heading>
<category name="GSTraceLocks" class="NSObject" ovadd="1.0.0">
<declared>Foundation/NSLock.h</declared>
<desc>
Controls tracing of locks for deadlocking.
</desc>
<method type="BOOL" factory="yes" ovadd="1.0.0">
<sel>shouldCreateTraceableLocks:</sel>
<arg type="BOOL">shouldTrace</arg>
<desc>
Sets whether newly created lock objects (NSCondition,
NSConditionLock, NSLock, NSRecursiveLock
but NOT NSDistributedLock) should be created so that
their use by threads is traced and deadlocks can be
detected. <br /> Returns the old value of the
setting.
</desc>
</method>
<method type="NSCondition*" factory="yes" ovadd="1.0.0">
<sel>tracedCondition</sel>
<desc>
Creates and returns a single autoreleased traced
condition.
</desc>
</method>
<method type="NSConditionLock*" factory="yes" ovadd="1.0.0">
<sel>tracedConditionLockWithCondition:</sel>
<arg type="NSInteger">value</arg>
<desc>
Creates and returns a single autoreleased traced
condition lock.
</desc>
</method>
<method type="NSLock*" factory="yes" ovadd="1.0.0">
<sel>tracedLock</sel>
<desc>
Creates and returns a single autoreleased traced
lock.
</desc>
</method>
<method type="NSRecursiveLock*" factory="yes" ovadd="1.0.0">
<sel>tracedRecursiveLock</sel>
<desc>
Creates and returns a single autoreleased traced
recursive lock.
</desc>
</method>
</category>
</chapter>
<chapter>
<heading>
Software documentation for the NSLocking protocol
</heading>
<protocol name="NSLocking" ovadd="1.0.0">
<declared>Foundation/NSLock.h</declared>
<desc>
Protocol defining lock and unlock operations.
</desc>
<method type="void" ovadd="1.0.0">
<sel>lock</sel>
<desc>
Block until acquiring lock.
</desc>
</method>
<method type="void" ovadd="1.0.0">
<sel>unlock</sel>
<desc>
Relinquish lock.
</desc>
</method>
</protocol>
</chapter>
</body>
</gsdoc>
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