3.2.3 omp_set_lock and omp_set_nest_lock Functions

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Each of these functions blocks the thread executing the function until the specified lock is available and then sets the lock. A simple lock is available if it is unlocked. A nestable lock is available if it is unlocked or if it is already owned by the thread executing the function. The format is as follows:

#include <omp.h>  
void omp_set_lock(omp_lock_t *lock);  
void omp_set_nest_lock(omp_nest_lock_t *lock);  

For a simple lock, the argument to the omp_set_lock function must point to an initialized lock variable. Ownership of the lock is granted to the thread executing the function.

For a nestable lock, the argument to the omp_set_nest_lock function must point to an initialized lock variable. The nesting count is incremented, and the thread is granted, or retains, ownership of the lock.