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omp_init_nest_lock

Initializes a lock.

void omp_init_nest_lock(
   omp_nest_lock_t *lock
);

where,

lock

A variable of type omp_nest_lock_t.

The initial nesting count is zero.

For more information, see 3.2.1 omp_init_lock and omp_init_nest_lock Functions.

// omp_init_nest_lock.cpp
// compile with: /openmp
#include <stdio.h>
#include <omp.h>

omp_nest_lock_t my_lock;

void Test() {
   int tid = omp_get_thread_num( );
   omp_set_nest_lock(&my_lock);
   printf_s("Thread %d - starting nested locked region\n", tid);
   printf_s("Thread %d - ending nested locked region\n", tid);
   omp_unset_nest_lock(&my_lock);
}

int main() {
   omp_init_nest_lock(&my_lock);

   #pragma omp parallel num_threads(4)
   {
      int i, j;

      for (i = 0; i < 5; ++i) {
         omp_set_nest_lock(&my_lock);
            if (i % 3) 
               Test();
            omp_unset_nest_lock(&my_lock);
        }
    }

    omp_destroy_nest_lock(&my_lock);
}
Thread 0 - starting nested locked region
Thread 0 - ending nested locked region
Thread 0 - starting nested locked region
Thread 0 - ending nested locked region
Thread 3 - starting nested locked region
Thread 3 - ending nested locked region
Thread 3 - starting nested locked region
Thread 3 - ending nested locked region
Thread 3 - starting nested locked region
Thread 3 - ending nested locked region
Thread 2 - starting nested locked region
Thread 2 - ending nested locked region
Thread 2 - starting nested locked region
Thread 2 - ending nested locked region
Thread 2 - starting nested locked region
Thread 2 - ending nested locked region
Thread 1 - starting nested locked region
Thread 1 - ending nested locked region
Thread 1 - starting nested locked region
Thread 1 - ending nested locked region
Thread 1 - starting nested locked region
Thread 1 - ending nested locked region
Thread 0 - starting nested locked region
Thread 0 - ending nested locked region
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