NXLock *theLock = [[NXLock alloc] init]; // done once!/* ... other code */[theLock lock];/* ... possibly a long time of fussing with global data... */[theLock unlock];
Copyright ©1995 by NeXT Computer, Inc. All Rights Reserved.
| NXLock |
| Inherits From: | Object | |
| Conforms To: | NXLock | |
| Declared In: | machkit/NXLock.h |
| Class Description |
| An NXLock is used to protect regions of code that can consume long periods of time, such as disk I/O or heavy computations. A lock is created once and is subsequently used to protect one or more regions of code. If a region of code is in use, an NXLock waits using the condition_wait() function, so the thread doesn't busy-wait. The following example shows the use of an NXLock: |
NXLock *theLock = [[NXLock alloc] init]; // done once!
/* ... other code */
[theLock lock];
/* ... possibly a long time of fussing with global data... */
[theLock unlock];
| The NXConditionLock, NXLock, NXRecursiveLock, and NXSpinLock classes all implement the NXLock protocol with various features and performance characteristics; see the other class descriptions for more information. |
| Instance Variables |
| None declared in this class. |
| Method Types |
| Acquire or release a lock |  lock |
| unlock |
| Instance Methods |
| lock |
| lock |
| Waits until the lock isn't in use, using condition_wait() if necessary, then grabs the lock. |
| unlock |
| unlock |
| Releases the lock, using condition_signal() to signal the next party that the lock is available. |