#include <cafe/os.h> BOOL OSUninterruptibleSpinLock_TryAcquire(OSSpinLock* inSpinlock);
|inSpinlock||Pointer to uninterruptible spinlock.|
TRUE if the
OSUninterruptibleSpinlock was acquired, or
FALSE if the
OSUninterruptibleSpinlock was previously acquired by a different thread or task.
OSUninterruptibleSpinLock_TryAcquire attempts to acquire an
OSUninterruptibleSpinLock. A thread may acquire an
OSUninterruptibleSpinLock recursively. Upon acquiring an
OSUninterruptibleSpinLock, interrupts are disabled. A thread must not leave interrupts disabled for long periods of time—typically no longer than 1-2
microseconds— to avoid disrupting user-mode COS components.
OSUninterruptibleSpinLock is approximately 5X faster to acquire and release than a regular
OSSpinLock and creates no contention for internal COS locks. The major condition is that between acquiring and releasing the
OSUninterruptibleSpinLock, interrupts are disabled and must remain disabled until the corresponding
OSUninterruptibleSpinLock_Release is called.
OSUninterruptibleSpinLock_Release purposely have the same parameter lists and same-sized data structures as the
OSSpinLock Acquire and Release functions. This is so that
OSUninterruptibleSpinLock can serve as a drop-in replacement for regular
OSSpinLock in many situations.
OSUninterruptibleSpinLocks do not participate in the thread canceling mechanism. If a thread wishes to benefit from both the faster
OSUninterruptibleSpinLock and from the ability to cross-thread cancel a thread,
OSTestThreadCancel should be called before
OSUninterruptibleSpinLock_Acquire and after
2013/05/08 Automated cleanup pass.
2012/08/01 Cleanup Pass.
2012/04/21 Initial version.