Applies to. Does not apply to. We updated Core5 this summer, and system requirements changed. Older versions of the Core5 iPad app were retired in July You will no longer be able to use iPad versions below 4.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. For more information, see 3. Returns a value that indicates if the number of threads available in upcoming parallel regions can be adjusted by the run time. That point will remain consistent during program execution, making upcoming comparisons possible.
Indicates that the number of threads available in upcoming parallel regions can be adjusted by the run time. If nonzero, the runtime can adjust the number of threads, if zero, the runtime won't dynamically adjust the number of threads. Enabling the environment variable can break an otherwise operational program, because the number of threads increases exponentially when nesting parallel regions.
For example, a function that recurses six times with the number of OMP threads set to 4 requires 4, 4 to the power of 6 threads. Skip to main content. A task that owns a lock can unset that lock, returning it to the unlocked state. A program in which a task unsets a lock that is owned by another task is non-conforming. Two types of locks are supported: simple locks and nestable locks. A nestable lock can be set multiple times by the same task before being unset; a simple lock cannot be set if it is already owned by the task trying to set it.
Simple lock variables are associated with simple locks and can only be passed to simple lock routines. Nestable lock variables are associated with nestable locks and can only be passed to nestable lock routines. Each type of lock can also have a synchronization hint that contains information about the intended usage of the lock by the application code. The effect of the hint is implementation defined. An OpenMP implementation can use this hint to select a usage-specific lock, but hints do not change the mutual exclusion semantics of locks.
A conforming implementation can safely ignore the hint. Constraints on the state and ownership of the lock accessed by each of the lock routines are described with the routine.
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An OpenMP lock can be in one of the following states: uninitialized; unlocked; or locked. If a lock is in the unlocked state, a task can set the lock, which. Constraints on ArgumentsA program that accesses a lock that is in the uninitialized state through either routine is non-conforming. A simple lock accessed by. omp_lock_t writelock; omp_init_lock(&writelock); #pragma omp parallel for for (i = 0; i < x; i++) { // some stuff.