omp_init_nest_lock
Initializes a lock.
void omp_init_nest_lock(
omp_nest_lock_t *lock
);
Remarks
where,
- lock
A variable of type omp_nest_lock_t.
Remarks
The initial nesting count is zero.
For more information, see 3.2.1 omp_init_lock and omp_init_nest_lock Functions.
Example
// 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