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3.2.5 omp_test_lock and omp_test_nest_lock Functions

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These functions attempt to set a lock but do not block execution of the thread. The format is as follows:

#include <omp.h>  
int omp_test_lock(omp_lock_t *lock);  
int omp_test_nest_lock(omp_nest_lock_t *lock);

The argument must point to an initialized lock variable. These functions attempt to set a lock in the same manner as omp_set_lock and omp_set_nest_lock, except that they do not block execution of the thread.

For a simple lock, the omp_test_lock function returns a nonzero value if the lock is successfully set; otherwise, it returns zero.

For a nestable lock, the omp_test_nest_lock function returns the new nesting count if the lock is successfully set; otherwise, it returns zero.